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Diffstat (limited to 'src/libs/sqlite3/sqlite3.h')
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diff --git a/src/libs/sqlite3/sqlite3.h b/src/libs/sqlite3/sqlite3.h new file mode 100644 index 00000000..57837cbb --- /dev/null +++ b/src/libs/sqlite3/sqlite3.h @@ -0,0 +1,5638 @@ +/* +** 2001 September 15 +** +** The author disclaims copyright to this source code. In place of +** a legal notice, here is a blessing: +** +** May you do good and not evil. +** May you find forgiveness for yourself and forgive others. +** May you share freely, never taking more than you give. +** +************************************************************************* +** This header file defines the interface that the SQLite library +** presents to client programs. If a C-function, structure, datatype, +** or constant definition does not appear in this file, then it is +** not a published API of SQLite, is subject to change without +** notice, and should not be referenced by programs that use SQLite. +** +** Some of the definitions that are in this file are marked as +** "experimental". Experimental interfaces are normally new +** features recently added to SQLite. We do not anticipate changes +** to experimental interfaces but reserve to make minor changes if +** experience from use "in the wild" suggest such changes are prudent. +** +** The official C-language API documentation for SQLite is derived +** from comments in this file. This file is the authoritative source +** on how SQLite interfaces are suppose to operate. +** +** The name of this file under configuration management is "sqlite.h.in". +** The makefile makes some minor changes to this file (such as inserting +** the version number) and changes its name to "sqlite3.h" as +** part of the build process. +** +** @(#) $Id: sqlite.h.in,v 1.312 2008/05/12 12:39:56 drh Exp $ +*/ +#ifndef _SQLITE3_H_ +#define _SQLITE3_H_ +#include <stdarg.h> /* Needed for the definition of va_list */ + +/* +** Make sure we can call this stuff from C++. +*/ +#ifdef __cplusplus +extern "C" { +#endif + + +/* +** Add the ability to override 'extern' +*/ +#ifndef SQLITE_EXTERN +# define SQLITE_EXTERN extern +#endif + +/* +** Make sure these symbols where not defined by some previous header +** file. +*/ +#ifdef SQLITE_VERSION +# undef SQLITE_VERSION +#endif +#ifdef SQLITE_VERSION_NUMBER +# undef SQLITE_VERSION_NUMBER +#endif + +/* +** CAPI3REF: Compile-Time Library Version Numbers {F10010} +** +** The SQLITE_VERSION and SQLITE_VERSION_NUMBER #defines in +** the sqlite3.h file specify the version of SQLite with which +** that header file is associated. +** +** The "version" of SQLite is a string of the form "X.Y.Z". +** The phrase "alpha" or "beta" might be appended after the Z. +** The X value is major version number always 3 in SQLite3. +** The X value only changes when backwards compatibility is +** broken and we intend to never break +** backwards compatibility. The Y value is the minor version +** number and only changes when +** there are major feature enhancements that are forwards compatible +** but not backwards compatible. The Z value is release number +** and is incremented with +** each release but resets back to 0 when Y is incremented. +** +** See also: [sqlite3_libversion()] and [sqlite3_libversion_number()]. +** +** INVARIANTS: +** +** {F10011} The SQLITE_VERSION #define in the sqlite3.h header file +** evaluates to a string literal that is the SQLite version +** with which the header file is associated. +** +** {F10014} The SQLITE_VERSION_NUMBER #define resolves to an integer +** with the value (X*1000000 + Y*1000 + Z) where X, Y, and +** Z are the major version, minor version, and release number. +*/ +#define SQLITE_VERSION "3.5.9" +#define SQLITE_VERSION_NUMBER 3005009 + +/* +** CAPI3REF: Run-Time Library Version Numbers {F10020} +** KEYWORDS: sqlite3_version +** +** These features provide the same information as the [SQLITE_VERSION] +** and [SQLITE_VERSION_NUMBER] #defines in the header, but are associated +** with the library instead of the header file. Cautious programmers might +** include a check in their application to verify that +** sqlite3_libversion_number() always returns the value +** [SQLITE_VERSION_NUMBER]. +** +** The sqlite3_libversion() function returns the same information as is +** in the sqlite3_version[] string constant. The function is provided +** for use in DLLs since DLL users usually do not have direct access to string +** constants within the DLL. +** +** INVARIANTS: +** +** {F10021} The [sqlite3_libversion_number()] interface returns an integer +** equal to [SQLITE_VERSION_NUMBER]. +** +** {F10022} The [sqlite3_version] string constant contains the text of the +** [SQLITE_VERSION] string. +** +** {F10023} The [sqlite3_libversion()] function returns +** a pointer to the [sqlite3_version] string constant. +*/ +SQLITE_EXTERN const char sqlite3_version[]; +const char *sqlite3_libversion(void); +int sqlite3_libversion_number(void); + +/* +** CAPI3REF: Test To See If The Library Is Threadsafe {F10100} +** +** SQLite can be compiled with or without mutexes. When +** the SQLITE_THREADSAFE C preprocessor macro is true, mutexes +** are enabled and SQLite is threadsafe. When that macro is false, +** the mutexes are omitted. Without the mutexes, it is not safe +** to use SQLite from more than one thread. +** +** There is a measurable performance penalty for enabling mutexes. +** So if speed is of utmost importance, it makes sense to disable +** the mutexes. But for maximum safety, mutexes should be enabled. +** The default behavior is for mutexes to be enabled. +** +** This interface can be used by a program to make sure that the +** version of SQLite that it is linking against was compiled with +** the desired setting of the SQLITE_THREADSAFE macro. +** +** INVARIANTS: +** +** {F10101} The [sqlite3_threadsafe()] function returns nonzero if +** SQLite was compiled with its mutexes enabled or zero +** if SQLite was compiled with mutexes disabled. +*/ +int sqlite3_threadsafe(void); + +/* +** CAPI3REF: Database Connection Handle {F12000} +** KEYWORDS: {database connection} {database connections} +** +** Each open SQLite database is represented by pointer to an instance of the +** opaque structure named "sqlite3". It is useful to think of an sqlite3 +** pointer as an object. The [sqlite3_open()], [sqlite3_open16()], and +** [sqlite3_open_v2()] interfaces are its constructors +** and [sqlite3_close()] is its destructor. There are many other interfaces +** (such as [sqlite3_prepare_v2()], [sqlite3_create_function()], and +** [sqlite3_busy_timeout()] to name but three) that are methods on this +** object. +*/ +typedef struct sqlite3 sqlite3; + + +/* +** CAPI3REF: 64-Bit Integer Types {F10200} +** KEYWORDS: sqlite_int64 sqlite_uint64 +** +** Because there is no cross-platform way to specify 64-bit integer types +** SQLite includes typedefs for 64-bit signed and unsigned integers. +** +** The sqlite3_int64 and sqlite3_uint64 are the preferred type +** definitions. The sqlite_int64 and sqlite_uint64 types are +** supported for backwards compatibility only. +** +** INVARIANTS: +** +** {F10201} The [sqlite_int64] and [sqlite3_int64] types specify a +** 64-bit signed integer. +** +** {F10202} The [sqlite_uint64] and [sqlite3_uint64] types specify +** a 64-bit unsigned integer. +*/ +#ifdef SQLITE_INT64_TYPE + typedef SQLITE_INT64_TYPE sqlite_int64; + typedef unsigned SQLITE_INT64_TYPE sqlite_uint64; +#elif defined(_MSC_VER) + typedef __int64 sqlite_int64; + typedef unsigned __int64 sqlite_uint64; +#else + typedef long long int sqlite_int64; + typedef unsigned long long int sqlite_uint64; +#endif +typedef sqlite_int64 sqlite3_int64; +typedef sqlite_uint64 sqlite3_uint64; + +/* +** If compiling for a processor that lacks floating point support, +** substitute integer for floating-point +*/ +#ifdef SQLITE_OMIT_FLOATING_POINT +# define double sqlite3_int64 +#endif + +/* +** CAPI3REF: Closing A Database Connection {F12010} +** +** This routine is the destructor for the [sqlite3] object. +** +** Applications should [sqlite3_finalize | finalize] all +** [prepared statements] and +** [sqlite3_blob_close | close] all [sqlite3_blob | BLOBs] +** associated with the [sqlite3] object prior +** to attempting to close the [sqlite3] object. +** +** <todo>What happens to pending transactions? Are they +** rolled back, or abandoned?</todo> +** +** INVARIANTS: +** +** {F12011} The [sqlite3_close()] interface destroys an [sqlite3] object +** allocated by a prior call to [sqlite3_open()], +** [sqlite3_open16()], or [sqlite3_open_v2()]. +** +** {F12012} The [sqlite3_close()] function releases all memory used by the +** connection and closes all open files. +** +** {F12013} If the database connection contains +** [prepared statements] that have not been +** finalized by [sqlite3_finalize()], then [sqlite3_close()] +** returns [SQLITE_BUSY] and leaves the connection open. +** +** {F12014} Giving sqlite3_close() a NULL pointer is a harmless no-op. +** +** LIMITATIONS: +** +** {U12015} The parameter to [sqlite3_close()] must be an [sqlite3] object +** pointer previously obtained from [sqlite3_open()] or the +** equivalent, or NULL. +** +** {U12016} The parameter to [sqlite3_close()] must not have been previously +** closed. +*/ +int sqlite3_close(sqlite3 *); + +/* +** The type for a callback function. +** This is legacy and deprecated. It is included for historical +** compatibility and is not documented. +*/ +typedef int (*sqlite3_callback)(void*,int,char**, char**); + +/* +** CAPI3REF: One-Step Query Execution Interface {F12100} +** +** The sqlite3_exec() interface is a convenient way of running +** one or more SQL statements without a lot of C code. The +** SQL statements are passed in as the second parameter to +** sqlite3_exec(). The statements are evaluated one by one +** until either an error or an interrupt is encountered or +** until they are all done. The 3rd parameter is an optional +** callback that is invoked once for each row of any query results +** produced by the SQL statements. The 5th parameter tells where +** to write any error messages. +** +** The sqlite3_exec() interface is implemented in terms of +** [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()]. +** The sqlite3_exec() routine does nothing that cannot be done +** by [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()]. +** The sqlite3_exec() is just a convenient wrapper. +** +** INVARIANTS: +** +** {F12101} The [sqlite3_exec()] interface evaluates zero or more UTF-8 +** encoded, semicolon-separated, SQL statements in the +** zero-terminated string of its 2nd parameter within the +** context of the [sqlite3] object given in the 1st parameter. +** +** {F12104} The return value of [sqlite3_exec()] is SQLITE_OK if all +** SQL statements run successfully. +** +** {F12105} The return value of [sqlite3_exec()] is an appropriate +** non-zero error code if any SQL statement fails. +** +** {F12107} If one or more of the SQL statements handed to [sqlite3_exec()] +** return results and the 3rd parameter is not NULL, then +** the callback function specified by the 3rd parameter is +** invoked once for each row of result. +** +** {F12110} If the callback returns a non-zero value then [sqlite3_exec()] +** will aborted the SQL statement it is currently evaluating, +** skip all subsequent SQL statements, and return [SQLITE_ABORT]. +** <todo>What happens to *errmsg here? Does the result code for +** sqlite3_errcode() get set?</todo> +** +** {F12113} The [sqlite3_exec()] routine will pass its 4th parameter through +** as the 1st parameter of the callback. +** +** {F12116} The [sqlite3_exec()] routine sets the 2nd parameter of its +** callback to be the number of columns in the current row of +** result. +** +** {F12119} The [sqlite3_exec()] routine sets the 3rd parameter of its +** callback to be an array of pointers to strings holding the +** values for each column in the current result set row as +** obtained from [sqlite3_column_text()]. +** +** {F12122} The [sqlite3_exec()] routine sets the 4th parameter of its +** callback to be an array of pointers to strings holding the +** names of result columns as obtained from [sqlite3_column_name()]. +** +** {F12125} If the 3rd parameter to [sqlite3_exec()] is NULL then +** [sqlite3_exec()] never invokes a callback. All query +** results are silently discarded. +** +** {F12128} If an error occurs while parsing or evaluating any of the SQL +** statements handed to [sqlite3_exec()] then [sqlite3_exec()] will +** return an [error code] other than [SQLITE_OK]. +** +** {F12131} If an error occurs while parsing or evaluating any of the SQL +** handed to [sqlite3_exec()] and if the 5th parameter (errmsg) +** to [sqlite3_exec()] is not NULL, then an error message is +** allocated using the equivalent of [sqlite3_mprintf()] and +** *errmsg is made to point to that message. +** +** {F12134} The [sqlite3_exec()] routine does not change the value of +** *errmsg if errmsg is NULL or if there are no errors. +** +** {F12137} The [sqlite3_exec()] function sets the error code and message +** accessible via [sqlite3_errcode()], [sqlite3_errmsg()], and +** [sqlite3_errmsg16()]. +** +** LIMITATIONS: +** +** {U12141} The first parameter to [sqlite3_exec()] must be an valid and open +** [database connection]. +** +** {U12142} The database connection must not be closed while +** [sqlite3_exec()] is running. +** +** {U12143} The calling function is should use [sqlite3_free()] to free +** the memory that *errmsg is left pointing at once the error +** message is no longer needed. +** +** {U12145} The SQL statement text in the 2nd parameter to [sqlite3_exec()] +** must remain unchanged while [sqlite3_exec()] is running. +*/ +int sqlite3_exec( + sqlite3*, /* An open database */ + const char *sql, /* SQL to be evaluted */ + int (*callback)(void*,int,char**,char**), /* Callback function */ + void *, /* 1st argument to callback */ + char **errmsg /* Error msg written here */ +); + +/* +** CAPI3REF: Result Codes {F10210} +** KEYWORDS: SQLITE_OK {error code} {error codes} +** +** Many SQLite functions return an integer result code from the set shown +** here in order to indicates success or failure. +** +** See also: [SQLITE_IOERR_READ | extended result codes] +*/ +#define SQLITE_OK 0 /* Successful result */ +/* beginning-of-error-codes */ +#define SQLITE_ERROR 1 /* SQL error or missing database */ +#define SQLITE_INTERNAL 2 /* Internal logic error in SQLite */ +#define SQLITE_PERM 3 /* Access permission denied */ +#define SQLITE_ABORT 4 /* Callback routine requested an abort */ +#define SQLITE_BUSY 5 /* The database file is locked */ +#define SQLITE_LOCKED 6 /* A table in the database is locked */ +#define SQLITE_NOMEM 7 /* A malloc() failed */ +#define SQLITE_READONLY 8 /* Attempt to write a readonly database */ +#define SQLITE_INTERRUPT 9 /* Operation terminated by sqlite3_interrupt()*/ +#define SQLITE_IOERR 10 /* Some kind of disk I/O error occurred */ +#define SQLITE_CORRUPT 11 /* The database disk image is malformed */ +#define SQLITE_NOTFOUND 12 /* NOT USED. Table or record not found */ +#define SQLITE_FULL 13 /* Insertion failed because database is full */ +#define SQLITE_CANTOPEN 14 /* Unable to open the database file */ +#define SQLITE_PROTOCOL 15 /* NOT USED. Database lock protocol error */ +#define SQLITE_EMPTY 16 /* Database is empty */ +#define SQLITE_SCHEMA 17 /* The database schema changed */ +#define SQLITE_TOOBIG 18 /* String or BLOB exceeds size limit */ +#define SQLITE_CONSTRAINT 19 /* Abort due to constraint violation */ +#define SQLITE_MISMATCH 20 /* Data type mismatch */ +#define SQLITE_MISUSE 21 /* Library used incorrectly */ +#define SQLITE_NOLFS 22 /* Uses OS features not supported on host */ +#define SQLITE_AUTH 23 /* Authorization denied */ +#define SQLITE_FORMAT 24 /* Auxiliary database format error */ +#define SQLITE_RANGE 25 /* 2nd parameter to sqlite3_bind out of range */ +#define SQLITE_NOTADB 26 /* File opened that is not a database file */ +#define SQLITE_ROW 100 /* sqlite3_step() has another row ready */ +#define SQLITE_DONE 101 /* sqlite3_step() has finished executing */ +/* end-of-error-codes */ + +/* +** CAPI3REF: Extended Result Codes {F10220} +** KEYWORDS: {extended error code} {extended error codes} +** KEYWORDS: {extended result codes} +** +** In its default configuration, SQLite API routines return one of 26 integer +** [SQLITE_OK | result codes]. However, experience has shown that +** many of these result codes are too course-grained. They do not provide as +** much information about problems as programmers might like. In an effort to +** address this, newer versions of SQLite (version 3.3.8 and later) include +** support for additional result codes that provide more detailed information +** about errors. The extended result codes are enabled or disabled +** for each database connection using the [sqlite3_extended_result_codes()] +** API. +** +** Some of the available extended result codes are listed here. +** One may expect the number of extended result codes will be expand +** over time. Software that uses extended result codes should expect +** to see new result codes in future releases of SQLite. +** +** The SQLITE_OK result code will never be extended. It will always +** be exactly zero. +** +** INVARIANTS: +** +** {F10223} The symbolic name for an extended result code always contains +** a related primary result code as a prefix. +** +** {F10224} Primary result code names contain a single "_" character. +** +** {F10225} Extended result code names contain two or more "_" characters. +** +** {F10226} The numeric value of an extended result code contains the +** numeric value of its corresponding primary result code in +** its least significant 8 bits. +*/ +#define SQLITE_IOERR_READ (SQLITE_IOERR | (1<<8)) +#define SQLITE_IOERR_SHORT_READ (SQLITE_IOERR | (2<<8)) +#define SQLITE_IOERR_WRITE (SQLITE_IOERR | (3<<8)) +#define SQLITE_IOERR_FSYNC (SQLITE_IOERR | (4<<8)) +#define SQLITE_IOERR_DIR_FSYNC (SQLITE_IOERR | (5<<8)) +#define SQLITE_IOERR_TRUNCATE (SQLITE_IOERR | (6<<8)) +#define SQLITE_IOERR_FSTAT (SQLITE_IOERR | (7<<8)) +#define SQLITE_IOERR_UNLOCK (SQLITE_IOERR | (8<<8)) +#define SQLITE_IOERR_RDLOCK (SQLITE_IOERR | (9<<8)) +#define SQLITE_IOERR_DELETE (SQLITE_IOERR | (10<<8)) +#define SQLITE_IOERR_BLOCKED (SQLITE_IOERR | (11<<8)) +#define SQLITE_IOERR_NOMEM (SQLITE_IOERR | (12<<8)) + +/* +** CAPI3REF: Flags For File Open Operations {F10230} +** +** These bit values are intended for use in the +** 3rd parameter to the [sqlite3_open_v2()] interface and +** in the 4th parameter to the xOpen method of the +** [sqlite3_vfs] object. +*/ +#define SQLITE_OPEN_READONLY 0x00000001 +#define SQLITE_OPEN_READWRITE 0x00000002 +#define SQLITE_OPEN_CREATE 0x00000004 +#define SQLITE_OPEN_DELETEONCLOSE 0x00000008 +#define SQLITE_OPEN_EXCLUSIVE 0x00000010 +#define SQLITE_OPEN_MAIN_DB 0x00000100 +#define SQLITE_OPEN_TEMP_DB 0x00000200 +#define SQLITE_OPEN_TRANSIENT_DB 0x00000400 +#define SQLITE_OPEN_MAIN_JOURNAL 0x00000800 +#define SQLITE_OPEN_TEMP_JOURNAL 0x00001000 +#define SQLITE_OPEN_SUBJOURNAL 0x00002000 +#define SQLITE_OPEN_MASTER_JOURNAL 0x00004000 + +/* +** CAPI3REF: Device Characteristics {F10240} +** +** The xDeviceCapabilities method of the [sqlite3_io_methods] +** object returns an integer which is a vector of the these +** bit values expressing I/O characteristics of the mass storage +** device that holds the file that the [sqlite3_io_methods] +** refers to. +** +** The SQLITE_IOCAP_ATOMIC property means that all writes of +** any size are atomic. The SQLITE_IOCAP_ATOMICnnn values +** mean that writes of blocks that are nnn bytes in size and +** are aligned to an address which is an integer multiple of +** nnn are atomic. The SQLITE_IOCAP_SAFE_APPEND value means +** that when data is appended to a file, the data is appended +** first then the size of the file is extended, never the other +** way around. The SQLITE_IOCAP_SEQUENTIAL property means that +** information is written to disk in the same order as calls +** to xWrite(). +*/ +#define SQLITE_IOCAP_ATOMIC 0x00000001 +#define SQLITE_IOCAP_ATOMIC512 0x00000002 +#define SQLITE_IOCAP_ATOMIC1K 0x00000004 +#define SQLITE_IOCAP_ATOMIC2K 0x00000008 +#define SQLITE_IOCAP_ATOMIC4K 0x00000010 +#define SQLITE_IOCAP_ATOMIC8K 0x00000020 +#define SQLITE_IOCAP_ATOMIC16K 0x00000040 +#define SQLITE_IOCAP_ATOMIC32K 0x00000080 +#define SQLITE_IOCAP_ATOMIC64K 0x00000100 +#define SQLITE_IOCAP_SAFE_APPEND 0x00000200 +#define SQLITE_IOCAP_SEQUENTIAL 0x00000400 + +/* +** CAPI3REF: File Locking Levels {F10250} +** +** SQLite uses one of these integer values as the second +** argument to calls it makes to the xLock() and xUnlock() methods +** of an [sqlite3_io_methods] object. +*/ +#define SQLITE_LOCK_NONE 0 +#define SQLITE_LOCK_SHARED 1 +#define SQLITE_LOCK_RESERVED 2 +#define SQLITE_LOCK_PENDING 3 +#define SQLITE_LOCK_EXCLUSIVE 4 + +/* +** CAPI3REF: Synchronization Type Flags {F10260} +** +** When SQLite invokes the xSync() method of an +** [sqlite3_io_methods] object it uses a combination of +** these integer values as the second argument. +** +** When the SQLITE_SYNC_DATAONLY flag is used, it means that the +** sync operation only needs to flush data to mass storage. Inode +** information need not be flushed. The SQLITE_SYNC_NORMAL flag means +** to use normal fsync() semantics. The SQLITE_SYNC_FULL flag means +** to use Mac OS-X style fullsync instead of fsync(). +*/ +#define SQLITE_SYNC_NORMAL 0x00002 +#define SQLITE_SYNC_FULL 0x00003 +#define SQLITE_SYNC_DATAONLY 0x00010 + + +/* +** CAPI3REF: OS Interface Open File Handle {F11110} +** +** An [sqlite3_file] object represents an open file in the OS +** interface layer. Individual OS interface implementations will +** want to subclass this object by appending additional fields +** for their own use. The pMethods entry is a pointer to an +** [sqlite3_io_methods] object that defines methods for performing +** I/O operations on the open file. +*/ +typedef struct sqlite3_file sqlite3_file; +struct sqlite3_file { + const struct sqlite3_io_methods *pMethods; /* Methods for an open file */ +}; + +/* +** CAPI3REF: OS Interface File Virtual Methods Object {F11120} +** +** Every file opened by the [sqlite3_vfs] xOpen method contains a pointer to +** an instance of this object. This object defines the +** methods used to perform various operations against the open file. +** +** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or +** [SQLITE_SYNC_FULL]. The first choice is the normal fsync(). +* The second choice is an +** OS-X style fullsync. The SQLITE_SYNC_DATA flag may be ORed in to +** indicate that only the data of the file and not its inode needs to be +** synced. +** +** The integer values to xLock() and xUnlock() are one of +** <ul> +** <li> [SQLITE_LOCK_NONE], +** <li> [SQLITE_LOCK_SHARED], +** <li> [SQLITE_LOCK_RESERVED], +** <li> [SQLITE_LOCK_PENDING], or +** <li> [SQLITE_LOCK_EXCLUSIVE]. +** </ul> +** xLock() increases the lock. xUnlock() decreases the lock. +** The xCheckReservedLock() method looks +** to see if any database connection, either in this +** process or in some other process, is holding an RESERVED, +** PENDING, or EXCLUSIVE lock on the file. It returns true +** if such a lock exists and false if not. +** +** The xFileControl() method is a generic interface that allows custom +** VFS implementations to directly control an open file using the +** [sqlite3_file_control()] interface. The second "op" argument +** is an integer opcode. The third +** argument is a generic pointer which is intended to be a pointer +** to a structure that may contain arguments or space in which to +** write return values. Potential uses for xFileControl() might be +** functions to enable blocking locks with timeouts, to change the +** locking strategy (for example to use dot-file locks), to inquire +** about the status of a lock, or to break stale locks. The SQLite +** core reserves opcodes less than 100 for its own use. +** A [SQLITE_FCNTL_LOCKSTATE | list of opcodes] less than 100 is available. +** Applications that define a custom xFileControl method should use opcodes +** greater than 100 to avoid conflicts. +** +** The xSectorSize() method returns the sector size of the +** device that underlies the file. The sector size is the +** minimum write that can be performed without disturbing +** other bytes in the file. The xDeviceCharacteristics() +** method returns a bit vector describing behaviors of the +** underlying device: +** +** <ul> +** <li> [SQLITE_IOCAP_ATOMIC] +** <li> [SQLITE_IOCAP_ATOMIC512] +** <li> [SQLITE_IOCAP_ATOMIC1K] +** <li> [SQLITE_IOCAP_ATOMIC2K] +** <li> [SQLITE_IOCAP_ATOMIC4K] +** <li> [SQLITE_IOCAP_ATOMIC8K] +** <li> [SQLITE_IOCAP_ATOMIC16K] +** <li> [SQLITE_IOCAP_ATOMIC32K] +** <li> [SQLITE_IOCAP_ATOMIC64K] +** <li> [SQLITE_IOCAP_SAFE_APPEND] +** <li> [SQLITE_IOCAP_SEQUENTIAL] +** </ul> +** +** The SQLITE_IOCAP_ATOMIC property means that all writes of +** any size are atomic. The SQLITE_IOCAP_ATOMICnnn values +** mean that writes of blocks that are nnn bytes in size and +** are aligned to an address which is an integer multiple of +** nnn are atomic. The SQLITE_IOCAP_SAFE_APPEND value means +** that when data is appended to a file, the data is appended +** first then the size of the file is extended, never the other +** way around. The SQLITE_IOCAP_SEQUENTIAL property means that +** information is written to disk in the same order as calls +** to xWrite(). +*/ +typedef struct sqlite3_io_methods sqlite3_io_methods; +struct sqlite3_io_methods { + int iVersion; + int (*xClose)(sqlite3_file*); + int (*xRead)(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst); + int (*xWrite)(sqlite3_file*, const void*, int iAmt, sqlite3_int64 iOfst); + int (*xTruncate)(sqlite3_file*, sqlite3_int64 size); + int (*xSync)(sqlite3_file*, int flags); + int (*xFileSize)(sqlite3_file*, sqlite3_int64 *pSize); + int (*xLock)(sqlite3_file*, int); + int (*xUnlock)(sqlite3_file*, int); + int (*xCheckReservedLock)(sqlite3_file*); + int (*xFileControl)(sqlite3_file*, int op, void *pArg); + int (*xSectorSize)(sqlite3_file*); + int (*xDeviceCharacteristics)(sqlite3_file*); + /* Additional methods may be added in future releases */ +}; + +/* +** CAPI3REF: Standard File Control Opcodes {F11310} +** +** These integer constants are opcodes for the xFileControl method +** of the [sqlite3_io_methods] object and to the [sqlite3_file_control()] +** interface. +** +** The [SQLITE_FCNTL_LOCKSTATE] opcode is used for debugging. This +** opcode causes the xFileControl method to write the current state of +** the lock (one of [SQLITE_LOCK_NONE], [SQLITE_LOCK_SHARED], +** [SQLITE_LOCK_RESERVED], [SQLITE_LOCK_PENDING], or [SQLITE_LOCK_EXCLUSIVE]) +** into an integer that the pArg argument points to. This capability +** is used during testing and only needs to be supported when SQLITE_TEST +** is defined. +*/ +#define SQLITE_FCNTL_LOCKSTATE 1 + +/* +** CAPI3REF: Mutex Handle {F17110} +** +** The mutex module within SQLite defines [sqlite3_mutex] to be an +** abstract type for a mutex object. The SQLite core never looks +** at the internal representation of an [sqlite3_mutex]. It only +** deals with pointers to the [sqlite3_mutex] object. +** +** Mutexes are created using [sqlite3_mutex_alloc()]. +*/ +typedef struct sqlite3_mutex sqlite3_mutex; + +/* +** CAPI3REF: OS Interface Object {F11140} +** +** An instance of this object defines the interface between the +** SQLite core and the underlying operating system. The "vfs" +** in the name of the object stands for "virtual file system". +** +** The iVersion field is initially 1 but may be larger for future +** versions of SQLite. Additional fields may be appended to this +** object when the iVersion value is increased. +** +** The szOsFile field is the size of the subclassed [sqlite3_file] +** structure used by this VFS. mxPathname is the maximum length of +** a pathname in this VFS. +** +** Registered sqlite3_vfs objects are kept on a linked list formed by +** the pNext pointer. The [sqlite3_vfs_register()] +** and [sqlite3_vfs_unregister()] interfaces manage this list +** in a thread-safe way. The [sqlite3_vfs_find()] interface +** searches the list. +** +** The pNext field is the only field in the sqlite3_vfs +** structure that SQLite will ever modify. SQLite will only access +** or modify this field while holding a particular static mutex. +** The application should never modify anything within the sqlite3_vfs +** object once the object has been registered. +** +** The zName field holds the name of the VFS module. The name must +** be unique across all VFS modules. +** +** {F11141} SQLite will guarantee that the zFilename string passed to +** xOpen() is a full pathname as generated by xFullPathname() and +** that the string will be valid and unchanged until xClose() is +** called. {END} So the [sqlite3_file] can store a pointer to the +** filename if it needs to remember the filename for some reason. +** +** {F11142} The flags argument to xOpen() includes all bits set in +** the flags argument to [sqlite3_open_v2()]. Or if [sqlite3_open()] +** or [sqlite3_open16()] is used, then flags includes at least +** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]. {END} +** If xOpen() opens a file read-only then it sets *pOutFlags to +** include [SQLITE_OPEN_READONLY]. Other bits in *pOutFlags may be +** set. +** +** {F11143} SQLite will also add one of the following flags to the xOpen() +** call, depending on the object being opened: +** +** <ul> +** <li> [SQLITE_OPEN_MAIN_DB] +** <li> [SQLITE_OPEN_MAIN_JOURNAL] +** <li> [SQLITE_OPEN_TEMP_DB] +** <li> [SQLITE_OPEN_TEMP_JOURNAL] +** <li> [SQLITE_OPEN_TRANSIENT_DB] +** <li> [SQLITE_OPEN_SUBJOURNAL] +** <li> [SQLITE_OPEN_MASTER_JOURNAL] +** </ul> {END} +** +** The file I/O implementation can use the object type flags to +** changes the way it deals with files. For example, an application +** that does not care about crash recovery or rollback might make +** the open of a journal file a no-op. Writes to this journal would +** also be no-ops, and any attempt to read the journal would return +** SQLITE_IOERR. Or the implementation might recognize that a database +** file will be doing page-aligned sector reads and writes in a random +** order and set up its I/O subsystem accordingly. +** +** SQLite might also add one of the following flags to the xOpen +** method: +** +** <ul> +** <li> [SQLITE_OPEN_DELETEONCLOSE] +** <li> [SQLITE_OPEN_EXCLUSIVE] +** </ul> +** +** {F11145} The [SQLITE_OPEN_DELETEONCLOSE] flag means the file should be +** deleted when it is closed. {F11146} The [SQLITE_OPEN_DELETEONCLOSE] +** will be set for TEMP databases, journals and for subjournals. +** {F11147} The [SQLITE_OPEN_EXCLUSIVE] flag means the file should be opened +** for exclusive access. This flag is set for all files except +** for the main database file. {END} +** +** {F11148} At least szOsFile bytes of memory are allocated by SQLite +** to hold the [sqlite3_file] structure passed as the third +** argument to xOpen. {END} The xOpen method does not have to +** allocate the structure; it should just fill it in. +** +** {F11149} The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS] +** to test for the existance of a file, +** or [SQLITE_ACCESS_READWRITE] to test to see +** if a file is readable and writable, or [SQLITE_ACCESS_READ] +** to test to see if a file is at least readable. {END} The file can be a +** directory. +** +** {F11150} SQLite will always allocate at least mxPathname+1 bytes for +** the output buffers for xGetTempname and xFullPathname. {F11151} The exact +** size of the output buffer is also passed as a parameter to both +** methods. {END} If the output buffer is not large enough, SQLITE_CANTOPEN +** should be returned. As this is handled as a fatal error by SQLite, +** vfs implementations should endeavor to prevent this by setting +** mxPathname to a sufficiently large value. +** +** The xRandomness(), xSleep(), and xCurrentTime() interfaces +** are not strictly a part of the filesystem, but they are +** included in the VFS structure for completeness. +** The xRandomness() function attempts to return nBytes bytes +** of good-quality randomness into zOut. The return value is +** the actual number of bytes of randomness obtained. The +** xSleep() method causes the calling thread to sleep for at +** least the number of microseconds given. The xCurrentTime() +** method returns a Julian Day Number for the current date and +** time. +*/ +typedef struct sqlite3_vfs sqlite3_vfs; +struct sqlite3_vfs { + int iVersion; /* Structure version number */ + int szOsFile; /* Size of subclassed sqlite3_file */ + int mxPathname; /* Maximum file pathname length */ + sqlite3_vfs *pNext; /* Next registered VFS */ + const char *zName; /* Name of this virtual file system */ + void *pAppData; /* Pointer to application-specific data */ + int (*xOpen)(sqlite3_vfs*, const char *zName, sqlite3_file*, + int flags, int *pOutFlags); + int (*xDelete)(sqlite3_vfs*, const char *zName, int syncDir); + int (*xAccess)(sqlite3_vfs*, const char *zName, int flags); + int (*xGetTempname)(sqlite3_vfs*, int nOut, char *zOut); + int (*xFullPathname)(sqlite3_vfs*, const char *zName, int nOut, char *zOut); + void *(*xDlOpen)(sqlite3_vfs*, const char *zFilename); + void (*xDlError)(sqlite3_vfs*, int nByte, char *zErrMsg); + void *(*xDlSym)(sqlite3_vfs*,void*, const char *zSymbol); + void (*xDlClose)(sqlite3_vfs*, void*); + int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut); + int (*xSleep)(sqlite3_vfs*, int microseconds); + int (*xCurrentTime)(sqlite3_vfs*, double*); + /* New fields may be appended in figure versions. The iVersion + ** value will increment whenever this happens. */ +}; + +/* +** CAPI3REF: Flags for the xAccess VFS method {F11190} +** +** {F11191} These integer constants can be used as the third parameter to +** the xAccess method of an [sqlite3_vfs] object. {END} They determine +** what kind of permissions the xAccess method is +** looking for. {F11192} With SQLITE_ACCESS_EXISTS, the xAccess method +** simply checks to see if the file exists. {F11193} With +** SQLITE_ACCESS_READWRITE, the xAccess method checks to see +** if the file is both readable and writable. {F11194} With +** SQLITE_ACCESS_READ the xAccess method +** checks to see if the file is readable. +*/ +#define SQLITE_ACCESS_EXISTS 0 +#define SQLITE_ACCESS_READWRITE 1 +#define SQLITE_ACCESS_READ 2 + +/* +** CAPI3REF: Enable Or Disable Extended Result Codes {F12200} +** +** The sqlite3_extended_result_codes() routine enables or disables the +** [SQLITE_IOERR_READ | extended result codes] feature of SQLite. +** The extended result codes are disabled by default for historical +** compatibility. +** +** INVARIANTS: +** +** {F12201} Each new [database connection] has the +** [extended result codes] feature +** disabled by default. +** +** {F12202} The [sqlite3_extended_result_codes(D,F)] interface will enable +** [extended result codes] for the +** [database connection] D if the F parameter +** is true, or disable them if F is false. +*/ +int sqlite3_extended_result_codes(sqlite3*, int onoff); + +/* +** CAPI3REF: Last Insert Rowid {F12220} +** +** Each entry in an SQLite table has a unique 64-bit signed +** integer key called the "rowid". The rowid is always available +** as an undeclared column named ROWID, OID, or _ROWID_ as long as those +** names are not also used by explicitly declared columns. If +** the table has a column of type INTEGER PRIMARY KEY then that column +** is another alias for the rowid. +** +** This routine returns the rowid of the most recent +** successful INSERT into the database from the database connection +** shown in the first argument. If no successful inserts +** have ever occurred on this database connection, zero is returned. +** +** If an INSERT occurs within a trigger, then the rowid of the +** inserted row is returned by this routine as long as the trigger +** is running. But once the trigger terminates, the value returned +** by this routine reverts to the last value inserted before the +** trigger fired. +** +** An INSERT that fails due to a constraint violation is not a +** successful insert and does not change the value returned by this +** routine. Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK, +** and INSERT OR ABORT make no changes to the return value of this +** routine when their insertion fails. When INSERT OR REPLACE +** encounters a constraint violation, it does not fail. The +** INSERT continues to completion after deleting rows that caused +** the constraint problem so INSERT OR REPLACE will always change +** the return value of this interface. +** +** For the purposes of this routine, an insert is considered to +** be successful even if it is subsequently rolled back. +** +** INVARIANTS: +** +** {F12221} The [sqlite3_last_insert_rowid()] function returns the +** rowid of the most recent successful insert done +** on the same database connection and within the same +** trigger context, or zero if there have +** been no qualifying inserts on that connection. +** +** {F12223} The [sqlite3_last_insert_rowid()] function returns +** same value when called from the same trigger context +** immediately before and after a ROLLBACK. +** +** LIMITATIONS: +** +** {U12232} If a separate thread does a new insert on the same +** database connection while the [sqlite3_last_insert_rowid()] +** function is running and thus changes the last insert rowid, +** then the value returned by [sqlite3_last_insert_rowid()] is +** unpredictable and might not equal either the old or the new +** last insert rowid. +*/ +sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*); + +/* +** CAPI3REF: Count The Number Of Rows Modified {F12240} +** +** This function returns the number of database rows that were changed +** or inserted or deleted by the most recently completed SQL statement +** on the connection specified by the first parameter. Only +** changes that are directly specified by the INSERT, UPDATE, or +** DELETE statement are counted. Auxiliary changes caused by +** triggers are not counted. Use the [sqlite3_total_changes()] function +** to find the total number of changes including changes caused by triggers. +** +** A "row change" is a change to a single row of a single table +** caused by an INSERT, DELETE, or UPDATE statement. Rows that +** are changed as side effects of REPLACE constraint resolution, +** rollback, ABORT processing, DROP TABLE, or by any other +** mechanisms do not count as direct row changes. +** +** A "trigger context" is a scope of execution that begins and +** ends with the script of a trigger. Most SQL statements are +** evaluated outside of any trigger. This is the "top level" +** trigger context. If a trigger fires from the top level, a +** new trigger context is entered for the duration of that one +** trigger. Subtriggers create subcontexts for their duration. +** +** Calling [sqlite3_exec()] or [sqlite3_step()] recursively does +** not create a new trigger context. +** +** This function returns the number of direct row changes in the +** most recent INSERT, UPDATE, or DELETE statement within the same +** trigger context. +** +** So when called from the top level, this function returns the +** number of changes in the most recent INSERT, UPDATE, or DELETE +** that also occurred at the top level. +** Within the body of a trigger, the sqlite3_changes() interface +** can be called to find the number of +** changes in the most recently completed INSERT, UPDATE, or DELETE +** statement within the body of the same trigger. +** However, the number returned does not include in changes +** caused by subtriggers since they have their own context. +** +** SQLite implements the command "DELETE FROM table" without +** a WHERE clause by dropping and recreating the table. (This is much +** faster than going through and deleting individual elements from the +** table.) Because of this optimization, the deletions in +** "DELETE FROM table" are not row changes and will not be counted +** by the sqlite3_changes() or [sqlite3_total_changes()] functions. +** To get an accurate count of the number of rows deleted, use +** "DELETE FROM table WHERE 1" instead. +** +** INVARIANTS: +** +** {F12241} The [sqlite3_changes()] function returns the number of +** row changes caused by the most recent INSERT, UPDATE, +** or DELETE statement on the same database connection and +** within the same trigger context, or zero if there have +** not been any qualifying row changes. +** +** LIMITATIONS: +** +** {U12252} If a separate thread makes changes on the same database connection +** while [sqlite3_changes()] is running then the value returned +** is unpredictable and unmeaningful. +*/ +int sqlite3_changes(sqlite3*); + +/* +** CAPI3REF: Total Number Of Rows Modified {F12260} +*** +** This function returns the number of row changes caused +** by INSERT, UPDATE or DELETE statements since the database handle +** was opened. The count includes all changes from all trigger +** contexts. But the count does not include changes used to +** implement REPLACE constraints, do rollbacks or ABORT processing, +** or DROP table processing. +** The changes +** are counted as soon as the statement that makes them is completed +** (when the statement handle is passed to [sqlite3_reset()] or +** [sqlite3_finalize()]). +** +** SQLite implements the command "DELETE FROM table" without +** a WHERE clause by dropping and recreating the table. (This is much +** faster than going +** through and deleting individual elements from the table.) Because of +** this optimization, the change count for "DELETE FROM table" will be +** zero regardless of the number of elements that were originally in the +** table. To get an accurate count of the number of rows deleted, use +** "DELETE FROM table WHERE 1" instead. +** +** See also the [sqlite3_changes()] interface. +** +** INVARIANTS: +** +** {F12261} The [sqlite3_total_changes()] returns the total number +** of row changes caused by INSERT, UPDATE, and/or DELETE +** statements on the same [database connection], in any +** trigger context, since the database connection was +** created. +** +** LIMITATIONS: +** +** {U12264} If a separate thread makes changes on the same database connection +** while [sqlite3_total_changes()] is running then the value +** returned is unpredictable and unmeaningful. +*/ +int sqlite3_total_changes(sqlite3*); + +/* +** CAPI3REF: Interrupt A Long-Running Query {F12270} +** +** This function causes any pending database operation to abort and +** return at its earliest opportunity. This routine is typically +** called in response to a user action such as pressing "Cancel" +** or Ctrl-C where the user wants a long query operation to halt +** immediately. +** +** It is safe to call this routine from a thread different from the +** thread that is currently running the database operation. But it +** is not safe to call this routine with a database connection that +** is closed or might close before sqlite3_interrupt() returns. +** +** If an SQL is very nearly finished at the time when sqlite3_interrupt() +** is called, then it might not have an opportunity to be interrupted. +** It might continue to completion. +** An SQL operation that is interrupted will return +** [SQLITE_INTERRUPT]. If the interrupted SQL operation is an +** INSERT, UPDATE, or DELETE that is inside an explicit transaction, +** then the entire transaction will be rolled back automatically. +** A call to sqlite3_interrupt() has no effect on SQL statements +** that are started after sqlite3_interrupt() returns. +** +** INVARIANTS: +** +** {F12271} The [sqlite3_interrupt()] interface will force all running +** SQL statements associated with the same database connection +** to halt after processing at most one additional row of +** data. +** +** {F12272} Any SQL statement that is interrupted by [sqlite3_interrupt()] +** will return [SQLITE_INTERRUPT]. +** +** LIMITATIONS: +** +** {U12279} If the database connection closes while [sqlite3_interrupt()] +** is running then bad things will likely happen. +*/ +void sqlite3_interrupt(sqlite3*); + +/* +** CAPI3REF: Determine If An SQL Statement Is Complete {F10510} +** +** These routines are useful for command-line input to determine if the +** currently entered text seems to form complete a SQL statement or +** if additional input is needed before sending the text into +** SQLite for parsing. These routines return true if the input string +** appears to be a complete SQL statement. A statement is judged to be +** complete if it ends with a semicolon token and is not a fragment of a +** CREATE TRIGGER statement. Semicolons that are embedded within +** string literals or quoted identifier names or comments are not +** independent tokens (they are part of the token in which they are +** embedded) and thus do not count as a statement terminator. +** +** These routines do not parse the SQL and +** so will not detect syntactically incorrect SQL. +** +** INVARIANTS: +** +** {F10511} The sqlite3_complete() and sqlite3_complete16() functions +** return true (non-zero) if and only if the last +** non-whitespace token in their input is a semicolon that +** is not in between the BEGIN and END of a CREATE TRIGGER +** statement. +** +** LIMITATIONS: +** +** {U10512} The input to sqlite3_complete() must be a zero-terminated +** UTF-8 string. +** +** {U10513} The input to sqlite3_complete16() must be a zero-terminated +** UTF-16 string in native byte order. +*/ +int sqlite3_complete(const char *sql); +int sqlite3_complete16(const void *sql); + +/* +** CAPI3REF: Register A Callback To Handle SQLITE_BUSY Errors {F12310} +** +** This routine identifies a callback function that might be +** invoked whenever an attempt is made to open a database table +** that another thread or process has locked. +** If the busy callback is NULL, then [SQLITE_BUSY] +** or [SQLITE_IOERR_BLOCKED] +** is returned immediately upon encountering the lock. +** If the busy callback is not NULL, then the +** callback will be invoked with two arguments. The +** first argument to the handler is a copy of the void* pointer which +** is the third argument to this routine. The second argument to +** the handler is the number of times that the busy handler has +** been invoked for this locking event. If the +** busy callback returns 0, then no additional attempts are made to +** access the database and [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED] is returned. +** If the callback returns non-zero, then another attempt +** is made to open the database for reading and the cycle repeats. +** +** The presence of a busy handler does not guarantee that +** it will be invoked when there is lock contention. +** If SQLite determines that invoking the busy handler could result in +** a deadlock, it will go ahead and return [SQLITE_BUSY] or +** [SQLITE_IOERR_BLOCKED] instead of invoking the +** busy handler. +** Consider a scenario where one process is holding a read lock that +** it is trying to promote to a reserved lock and +** a second process is holding a reserved lock that it is trying +** to promote to an exclusive lock. The first process cannot proceed +** because it is blocked by the second and the second process cannot +** proceed because it is blocked by the first. If both processes +** invoke the busy handlers, neither will make any progress. Therefore, +** SQLite returns [SQLITE_BUSY] for the first process, hoping that this +** will induce the first process to release its read lock and allow +** the second process to proceed. +** +** The default busy callback is NULL. +** +** The [SQLITE_BUSY] error is converted to [SQLITE_IOERR_BLOCKED] +** when SQLite is in the middle of a large transaction where all the +** changes will not fit into the in-memory cache. SQLite will +** already hold a RESERVED lock on the database file, but it needs +** to promote this lock to EXCLUSIVE so that it can spill cache +** pages into the database file without harm to concurrent +** readers. If it is unable to promote the lock, then the in-memory +** cache will be left in an inconsistent state and so the error +** code is promoted from the relatively benign [SQLITE_BUSY] to +** the more severe [SQLITE_IOERR_BLOCKED]. This error code promotion +** forces an automatic rollback of the changes. See the +** <a href="http://www.sqlite.org/cvstrac/wiki?p=CorruptionFollowingBusyError"> +** CorruptionFollowingBusyError</a> wiki page for a discussion of why +** this is important. +** +** There can only be a single busy handler defined for each database +** connection. Setting a new busy handler clears any previous one. +** Note that calling [sqlite3_busy_timeout()] will also set or clear +** the busy handler. +** +** INVARIANTS: +** +** {F12311} The [sqlite3_busy_handler()] function replaces the busy handler +** callback in the database connection identified by the 1st +** parameter with a new busy handler identified by the 2nd and 3rd +** parameters. +** +** {F12312} The default busy handler for new database connections is NULL. +** +** {F12314} When two or more database connection share a common cache, +** the busy handler for the database connection currently using +** the cache is invoked when the cache encounters a lock. +** +** {F12316} If a busy handler callback returns zero, then the SQLite +** interface that provoked the locking event will return +** [SQLITE_BUSY]. +** +** {F12318} SQLite will invokes the busy handler with two argument which +** are a copy of the pointer supplied by the 3rd parameter to +** [sqlite3_busy_handler()] and a count of the number of prior +** invocations of the busy handler for the same locking event. +** +** LIMITATIONS: +** +** {U12319} A busy handler should not call close the database connection +** or prepared statement that invoked the busy handler. +*/ +int sqlite3_busy_handler(sqlite3*, int(*)(void*,int), void*); + +/* +** CAPI3REF: Set A Busy Timeout {F12340} +** +** This routine sets a [sqlite3_busy_handler | busy handler] +** that sleeps for a while when a +** table is locked. The handler will sleep multiple times until +** at least "ms" milliseconds of sleeping have been done. {F12343} After +** "ms" milliseconds of sleeping, the handler returns 0 which +** causes [sqlite3_step()] to return [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED]. +** +** Calling this routine with an argument less than or equal to zero +** turns off all busy handlers. +** +** There can only be a single busy handler for a particular database +** connection. If another busy handler was defined +** (using [sqlite3_busy_handler()]) prior to calling +** this routine, that other busy handler is cleared. +** +** INVARIANTS: +** +** {F12341} The [sqlite3_busy_timeout()] function overrides any prior +** [sqlite3_busy_timeout()] or [sqlite3_busy_handler()] setting +** on the same database connection. +** +** {F12343} If the 2nd parameter to [sqlite3_busy_timeout()] is less than +** or equal to zero, then the busy handler is cleared so that +** all subsequent locking events immediately return [SQLITE_BUSY]. +** +** {F12344} If the 2nd parameter to [sqlite3_busy_timeout()] is a positive +** number N, then a busy handler is set that repeatedly calls +** the xSleep() method in the VFS interface until either the +** lock clears or until the cumulative sleep time reported back +** by xSleep() exceeds N milliseconds. +*/ +int sqlite3_busy_timeout(sqlite3*, int ms); + +/* +** CAPI3REF: Convenience Routines For Running Queries {F12370} +** +** Definition: A <b>result table</b> is memory data structure created by the +** [sqlite3_get_table()] interface. A result table records the +** complete query results from one or more queries. +** +** The table conceptually has a number of rows and columns. But +** these numbers are not part of the result table itself. These +** numbers are obtained separately. Let N be the number of rows +** and M be the number of columns. +** +** A result table is an array of pointers to zero-terminated +** UTF-8 strings. There are (N+1)*M elements in the array. +** The first M pointers point to zero-terminated strings that +** contain the names of the columns. +** The remaining entries all point to query results. NULL +** values are give a NULL pointer. All other values are in +** their UTF-8 zero-terminated string representation as returned by +** [sqlite3_column_text()]. +** +** A result table might consists of one or more memory allocations. +** It is not safe to pass a result table directly to [sqlite3_free()]. +** A result table should be deallocated using [sqlite3_free_table()]. +** +** As an example of the result table format, suppose a query result +** is as follows: +** +** <blockquote><pre> +** Name | Age +** ----------------------- +** Alice | 43 +** Bob | 28 +** Cindy | 21 +** </pre></blockquote> +** +** There are two column (M==2) and three rows (N==3). Thus the +** result table has 8 entries. Suppose the result table is stored +** in an array names azResult. Then azResult holds this content: +** +** <blockquote><pre> +** azResult[0] = "Name"; +** azResult[1] = "Age"; +** azResult[2] = "Alice"; +** azResult[3] = "43"; +** azResult[4] = "Bob"; +** azResult[5] = "28"; +** azResult[6] = "Cindy"; +** azResult[7] = "21"; +** </pre></blockquote> +** +** The sqlite3_get_table() function evaluates one or more +** semicolon-separated SQL statements in the zero-terminated UTF-8 +** string of its 2nd parameter. It returns a result table to the +** pointer given in its 3rd parameter. +** +** After the calling function has finished using the result, it should +** pass the pointer to the result table to sqlite3_free_table() in order to +** release the memory that was malloc-ed. Because of the way the +** [sqlite3_malloc()] happens within sqlite3_get_table(), the calling +** function must not try to call [sqlite3_free()] directly. Only +** [sqlite3_free_table()] is able to release the memory properly and safely. +** +** The sqlite3_get_table() interface is implemented as a wrapper around +** [sqlite3_exec()]. The sqlite3_get_table() routine does not have access +** to any internal data structures of SQLite. It uses only the public +** interface defined here. As a consequence, errors that occur in the +** wrapper layer outside of the internal [sqlite3_exec()] call are not +** reflected in subsequent calls to [sqlite3_errcode()] or +** [sqlite3_errmsg()]. +** +** INVARIANTS: +** +** {F12371} If a [sqlite3_get_table()] fails a memory allocation, then +** it frees the result table under construction, aborts the +** query in process, skips any subsequent queries, sets the +** *resultp output pointer to NULL and returns [SQLITE_NOMEM]. +** +** {F12373} If the ncolumn parameter to [sqlite3_get_table()] is not NULL +** then [sqlite3_get_table()] write the number of columns in the +** result set of the query into *ncolumn if the query is +** successful (if the function returns SQLITE_OK). +** +** {F12374} If the nrow parameter to [sqlite3_get_table()] is not NULL +** then [sqlite3_get_table()] write the number of rows in the +** result set of the query into *nrow if the query is +** successful (if the function returns SQLITE_OK). +** +** {F12376} The [sqlite3_get_table()] function sets its *ncolumn value +** to the number of columns in the result set of the query in the +** sql parameter, or to zero if the query in sql has an empty +** result set. +*/ +int sqlite3_get_table( + sqlite3*, /* An open database */ + const char *sql, /* SQL to be evaluated */ + char ***pResult, /* Results of the query */ + int *nrow, /* Number of result rows written here */ + int *ncolumn, /* Number of result columns written here */ + char **errmsg /* Error msg written here */ +); +void sqlite3_free_table(char **result); + +/* +** CAPI3REF: Formatted String Printing Functions {F17400} +** +** These routines are workalikes of the "printf()" family of functions +** from the standard C library. +** +** The sqlite3_mprintf() and sqlite3_vmprintf() routines write their +** results into memory obtained from [sqlite3_malloc()]. +** The strings returned by these two routines should be +** released by [sqlite3_free()]. Both routines return a +** NULL pointer if [sqlite3_malloc()] is unable to allocate enough +** memory to hold the resulting string. +** +** In sqlite3_snprintf() routine is similar to "snprintf()" from +** the standard C library. The result is written into the +** buffer supplied as the second parameter whose size is given by +** the first parameter. Note that the order of the +** first two parameters is reversed from snprintf(). This is an +** historical accident that cannot be fixed without breaking +** backwards compatibility. Note also that sqlite3_snprintf() +** returns a pointer to its buffer instead of the number of +** characters actually written into the buffer. We admit that +** the number of characters written would be a more useful return +** value but we cannot change the implementation of sqlite3_snprintf() +** now without breaking compatibility. +** +** As long as the buffer size is greater than zero, sqlite3_snprintf() +** guarantees that the buffer is always zero-terminated. The first +** parameter "n" is the total size of the buffer, including space for +** the zero terminator. So the longest string that can be completely +** written will be n-1 characters. +** +** These routines all implement some additional formatting +** options that are useful for constructing SQL statements. +** All of the usual printf formatting options apply. In addition, there +** is are "%q", "%Q", and "%z" options. +** +** The %q option works like %s in that it substitutes a null-terminated +** string from the argument list. But %q also doubles every '\'' character. +** %q is designed for use inside a string literal. By doubling each '\'' +** character it escapes that character and allows it to be inserted into +** the string. +** +** For example, so some string variable contains text as follows: +** +** <blockquote><pre> +** char *zText = "It's a happy day!"; +** </pre></blockquote> +** +** One can use this text in an SQL statement as follows: +** +** <blockquote><pre> +** char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES('%q')", zText); +** sqlite3_exec(db, zSQL, 0, 0, 0); +** sqlite3_free(zSQL); +** </pre></blockquote> +** +** Because the %q format string is used, the '\'' character in zText +** is escaped and the SQL generated is as follows: +** +** <blockquote><pre> +** INSERT INTO table1 VALUES('It''s a happy day!') +** </pre></blockquote> +** +** This is correct. Had we used %s instead of %q, the generated SQL +** would have looked like this: +** +** <blockquote><pre> +** INSERT INTO table1 VALUES('It's a happy day!'); +** </pre></blockquote> +** +** This second example is an SQL syntax error. As a general rule you +** should always use %q instead of %s when inserting text into a string +** literal. +** +** The %Q option works like %q except it also adds single quotes around +** the outside of the total string. Or if the parameter in the argument +** list is a NULL pointer, %Q substitutes the text "NULL" (without single +** quotes) in place of the %Q option. {END} So, for example, one could say: +** +** <blockquote><pre> +** char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES(%Q)", zText); +** sqlite3_exec(db, zSQL, 0, 0, 0); +** sqlite3_free(zSQL); +** </pre></blockquote> +** +** The code above will render a correct SQL statement in the zSQL +** variable even if the zText variable is a NULL pointer. +** +** The "%z" formatting option works exactly like "%s" with the +** addition that after the string has been read and copied into +** the result, [sqlite3_free()] is called on the input string. {END} +** +** INVARIANTS: +** +** {F17403} The [sqlite3_mprintf()] and [sqlite3_vmprintf()] interfaces +** return either pointers to zero-terminated UTF-8 strings held in +** memory obtained from [sqlite3_malloc()] or NULL pointers if +** a call to [sqlite3_malloc()] fails. +** +** {F17406} The [sqlite3_snprintf()] interface writes a zero-terminated +** UTF-8 string into the buffer pointed to by the second parameter +** provided that the first parameter is greater than zero. +** +** {F17407} The [sqlite3_snprintf()] interface does not writes slots of +** its output buffer (the second parameter) outside the range +** of 0 through N-1 (where N is the first parameter) +** regardless of the length of the string +** requested by the format specification. +** +*/ +char *sqlite3_mprintf(const char*,...); +char *sqlite3_vmprintf(const char*, va_list); +char *sqlite3_snprintf(int,char*,const char*, ...); + +/* +** CAPI3REF: Memory Allocation Subsystem {F17300} +** +** The SQLite core uses these three routines for all of its own +** internal memory allocation needs. "Core" in the previous sentence +** does not include operating-system specific VFS implementation. The +** windows VFS uses native malloc and free for some operations. +** +** The sqlite3_malloc() routine returns a pointer to a block +** of memory at least N bytes in length, where N is the parameter. +** If sqlite3_malloc() is unable to obtain sufficient free +** memory, it returns a NULL pointer. If the parameter N to +** sqlite3_malloc() is zero or negative then sqlite3_malloc() returns +** a NULL pointer. +** +** Calling sqlite3_free() with a pointer previously returned +** by sqlite3_malloc() or sqlite3_realloc() releases that memory so +** that it might be reused. The sqlite3_free() routine is +** a no-op if is called with a NULL pointer. Passing a NULL pointer +** to sqlite3_free() is harmless. After being freed, memory +** should neither be read nor written. Even reading previously freed +** memory might result in a segmentation fault or other severe error. +** Memory corruption, a segmentation fault, or other severe error +** might result if sqlite3_free() is called with a non-NULL pointer that +** was not obtained from sqlite3_malloc() or sqlite3_free(). +** +** The sqlite3_realloc() interface attempts to resize a +** prior memory allocation to be at least N bytes, where N is the +** second parameter. The memory allocation to be resized is the first +** parameter. If the first parameter to sqlite3_realloc() +** is a NULL pointer then its behavior is identical to calling +** sqlite3_malloc(N) where N is the second parameter to sqlite3_realloc(). +** If the second parameter to sqlite3_realloc() is zero or +** negative then the behavior is exactly the same as calling +** sqlite3_free(P) where P is the first parameter to sqlite3_realloc(). +** Sqlite3_realloc() returns a pointer to a memory allocation +** of at least N bytes in size or NULL if sufficient memory is unavailable. +** If M is the size of the prior allocation, then min(N,M) bytes +** of the prior allocation are copied into the beginning of buffer returned +** by sqlite3_realloc() and the prior allocation is freed. +** If sqlite3_realloc() returns NULL, then the prior allocation +** is not freed. +** +** The memory returned by sqlite3_malloc() and sqlite3_realloc() +** is always aligned to at least an 8 byte boundary. {END} +** +** The default implementation +** of the memory allocation subsystem uses the malloc(), realloc() +** and free() provided by the standard C library. {F17382} However, if +** SQLite is compiled with the following C preprocessor macro +** +** <blockquote> SQLITE_MEMORY_SIZE=<i>NNN</i> </blockquote> +** +** where <i>NNN</i> is an integer, then SQLite create a static +** array of at least <i>NNN</i> bytes in size and use that array +** for all of its dynamic memory allocation needs. {END} Additional +** memory allocator options may be added in future releases. +** +** In SQLite version 3.5.0 and 3.5.1, it was possible to define +** the SQLITE_OMIT_MEMORY_ALLOCATION which would cause the built-in +** implementation of these routines to be omitted. That capability +** is no longer provided. Only built-in memory allocators can be +** used. +** +** The windows OS interface layer calls +** the system malloc() and free() directly when converting +** filenames between the UTF-8 encoding used by SQLite +** and whatever filename encoding is used by the particular windows +** installation. Memory allocation errors are detected, but +** they are reported back as [SQLITE_CANTOPEN] or +** [SQLITE_IOERR] rather than [SQLITE_NOMEM]. +** +** INVARIANTS: +** +** {F17303} The [sqlite3_malloc(N)] interface returns either a pointer to +** newly checked-out block of at least N bytes of memory +** that is 8-byte aligned, +** or it returns NULL if it is unable to fulfill the request. +** +** {F17304} The [sqlite3_malloc(N)] interface returns a NULL pointer if +** N is less than or equal to zero. +** +** {F17305} The [sqlite3_free(P)] interface releases memory previously +** returned from [sqlite3_malloc()] or [sqlite3_realloc()], +** making it available for reuse. +** +** {F17306} A call to [sqlite3_free(NULL)] is a harmless no-op. +** +** {F17310} A call to [sqlite3_realloc(0,N)] is equivalent to a call +** to [sqlite3_malloc(N)]. +** +** {F17312} A call to [sqlite3_realloc(P,0)] is equivalent to a call +** to [sqlite3_free(P)]. +** +** {F17315} The SQLite core uses [sqlite3_malloc()], [sqlite3_realloc()], +** and [sqlite3_free()] for all of its memory allocation and +** deallocation needs. +** +** {F17318} The [sqlite3_realloc(P,N)] interface returns either a pointer +** to a block of checked-out memory of at least N bytes in size +** that is 8-byte aligned, or a NULL pointer. +** +** {F17321} When [sqlite3_realloc(P,N)] returns a non-NULL pointer, it first +** copies the first K bytes of content from P into the newly allocated +** where K is the lessor of N and the size of the buffer P. +** +** {F17322} When [sqlite3_realloc(P,N)] returns a non-NULL pointer, it first +** releases the buffer P. +** +** {F17323} When [sqlite3_realloc(P,N)] returns NULL, the buffer P is +** not modified or released. +** +** LIMITATIONS: +** +** {U17350} The pointer arguments to [sqlite3_free()] and [sqlite3_realloc()] +** must be either NULL or else a pointer obtained from a prior +** invocation of [sqlite3_malloc()] or [sqlite3_realloc()] that has +** not been released. +** +** {U17351} The application must not read or write any part of +** a block of memory after it has been released using +** [sqlite3_free()] or [sqlite3_realloc()]. +** +*/ +void *sqlite3_malloc(int); +void *sqlite3_realloc(void*, int); +void sqlite3_free(void*); + +/* +** CAPI3REF: Memory Allocator Statistics {F17370} +** +** SQLite provides these two interfaces for reporting on the status +** of the [sqlite3_malloc()], [sqlite3_free()], and [sqlite3_realloc()] +** the memory allocation subsystem included within the SQLite. +** +** INVARIANTS: +** +** {F17371} The [sqlite3_memory_used()] routine returns the +** number of bytes of memory currently outstanding +** (malloced but not freed). +** +** {F17373} The [sqlite3_memory_highwater()] routine returns the maximum +** value of [sqlite3_memory_used()] +** since the highwater mark was last reset. +** +** {F17374} The values returned by [sqlite3_memory_used()] and +** [sqlite3_memory_highwater()] include any overhead +** added by SQLite in its implementation of [sqlite3_malloc()], +** but not overhead added by the any underlying system library +** routines that [sqlite3_malloc()] may call. +** +** {F17375} The memory highwater mark is reset to the current value of +** [sqlite3_memory_used()] if and only if the parameter to +** [sqlite3_memory_highwater()] is true. The value returned +** by [sqlite3_memory_highwater(1)] is the highwater mark +** prior to the reset. +*/ +sqlite3_int64 sqlite3_memory_used(void); +sqlite3_int64 sqlite3_memory_highwater(int resetFlag); + +/* +** CAPI3REF: Pseudo-Random Number Generator {F17390} +** +** SQLite contains a high-quality pseudo-random number generator (PRNG) used to +** select random ROWIDs when inserting new records into a table that +** already uses the largest possible ROWID. The PRNG is also used for +** the build-in random() and randomblob() SQL functions. This interface allows +** appliations to access the same PRNG for other purposes. +** +** A call to this routine stores N bytes of randomness into buffer P. +** +** The first time this routine is invoked (either internally or by +** the application) the PRNG is seeded using randomness obtained +** from the xRandomness method of the default [sqlite3_vfs] object. +** On all subsequent invocations, the pseudo-randomness is generated +** internally and without recourse to the [sqlite3_vfs] xRandomness +** method. +** +** INVARIANTS: +** +** {F17392} The [sqlite3_randomness(N,P)] interface writes N bytes of +** high-quality pseudo-randomness into buffer P. +*/ +void sqlite3_randomness(int N, void *P); + +/* +** CAPI3REF: Compile-Time Authorization Callbacks {F12500} +** +** This routine registers a authorizer callback with a particular +** [database connection], supplied in the first argument. +** The authorizer callback is invoked as SQL statements are being compiled +** by [sqlite3_prepare()] or its variants [sqlite3_prepare_v2()], +** [sqlite3_prepare16()] and [sqlite3_prepare16_v2()]. At various +** points during the compilation process, as logic is being created +** to perform various actions, the authorizer callback is invoked to +** see if those actions are allowed. The authorizer callback should +** return [SQLITE_OK] to allow the action, [SQLITE_IGNORE] to disallow the +** specific action but allow the SQL statement to continue to be +** compiled, or [SQLITE_DENY] to cause the entire SQL statement to be +** rejected with an error. If the authorizer callback returns +** any value other than [SQLITE_IGNORE], [SQLITE_OK], or [SQLITE_DENY] +** then [sqlite3_prepare_v2()] or equivalent call that triggered +** the authorizer will fail with an error message. +** +** When the callback returns [SQLITE_OK], that means the operation +** requested is ok. When the callback returns [SQLITE_DENY], the +** [sqlite3_prepare_v2()] or equivalent call that triggered the +** authorizer will fail with an error message explaining that +** access is denied. If the authorizer code is [SQLITE_READ] +** and the callback returns [SQLITE_IGNORE] then the +** [prepared statement] statement is constructed to substitute +** a NULL value in place of the table column that would have +** been read if [SQLITE_OK] had been returned. The [SQLITE_IGNORE] +** return can be used to deny an untrusted user access to individual +** columns of a table. +** +** The first parameter to the authorizer callback is a copy of +** the third parameter to the sqlite3_set_authorizer() interface. +** The second parameter to the callback is an integer +** [SQLITE_COPY | action code] that specifies the particular action +** to be authorized. The third through sixth +** parameters to the callback are zero-terminated strings that contain +** additional details about the action to be authorized. +** +** An authorizer is used when [sqlite3_prepare | preparing] +** SQL statements from an untrusted +** source, to ensure that the SQL statements do not try to access data +** that they are not allowed to see, or that they do not try to +** execute malicious statements that damage the database. For +** example, an application may allow a user to enter arbitrary +** SQL queries for evaluation by a database. But the application does +** not want the user to be able to make arbitrary changes to the +** database. An authorizer could then be put in place while the +** user-entered SQL is being [sqlite3_prepare | prepared] that +** disallows everything except [SELECT] statements. +** +** Applications that need to process SQL from untrusted sources +** might also consider lowering resource limits using [sqlite3_limit()] +** and limiting database size using the [max_page_count] [PRAGMA] +** in addition to using an authorizer. +** +** Only a single authorizer can be in place on a database connection +** at a time. Each call to sqlite3_set_authorizer overrides the +** previous call. Disable the authorizer by installing a NULL callback. +** The authorizer is disabled by default. +** +** Note that the authorizer callback is invoked only during +** [sqlite3_prepare()] or its variants. Authorization is not +** performed during statement evaluation in [sqlite3_step()]. +** +** INVARIANTS: +** +** {F12501} The [sqlite3_set_authorizer(D,...)] interface registers a +** authorizer callback with database connection D. +** +** {F12502} The authorizer callback is invoked as SQL statements are +** being compiled +** +** {F12503} If the authorizer callback returns any value other than +** [SQLITE_IGNORE], [SQLITE_OK], or [SQLITE_DENY] then +** the [sqlite3_prepare_v2()] or equivalent call that caused +** the authorizer callback to run shall fail with an +** [SQLITE_ERROR] error code and an appropriate error message. +** +** {F12504} When the authorizer callback returns [SQLITE_OK], the operation +** described is coded normally. +** +** {F12505} When the authorizer callback returns [SQLITE_DENY], the +** [sqlite3_prepare_v2()] or equivalent call that caused the +** authorizer callback to run shall fail +** with an [SQLITE_ERROR] error code and an error message +** explaining that access is denied. +** +** {F12506} If the authorizer code (the 2nd parameter to the authorizer +** callback) is [SQLITE_READ] and the authorizer callback returns +** [SQLITE_IGNORE] then the prepared statement is constructed to +** insert a NULL value in place of the table column that would have +** been read if [SQLITE_OK] had been returned. +** +** {F12507} If the authorizer code (the 2nd parameter to the authorizer +** callback) is anything other than [SQLITE_READ], then +** a return of [SQLITE_IGNORE] has the same effect as [SQLITE_DENY]. +** +** {F12510} The first parameter to the authorizer callback is a copy of +** the third parameter to the [sqlite3_set_authorizer()] interface. +** +** {F12511} The second parameter to the callback is an integer +** [SQLITE_COPY | action code] that specifies the particular action +** to be authorized. +** +** {F12512} The third through sixth parameters to the callback are +** zero-terminated strings that contain +** additional details about the action to be authorized. +** +** {F12520} Each call to [sqlite3_set_authorizer()] overrides the +** any previously installed authorizer. +** +** {F12521} A NULL authorizer means that no authorization +** callback is invoked. +** +** {F12522} The default authorizer is NULL. +*/ +int sqlite3_set_authorizer( + sqlite3*, + int (*xAuth)(void*,int,const char*,const char*,const char*,const char*), + void *pUserData +); + +/* +** CAPI3REF: Authorizer Return Codes {F12590} +** +** The [sqlite3_set_authorizer | authorizer callback function] must +** return either [SQLITE_OK] or one of these two constants in order +** to signal SQLite whether or not the action is permitted. See the +** [sqlite3_set_authorizer | authorizer documentation] for additional +** information. +*/ +#define SQLITE_DENY 1 /* Abort the SQL statement with an error */ +#define SQLITE_IGNORE 2 /* Don't allow access, but don't generate an error */ + +/* +** CAPI3REF: Authorizer Action Codes {F12550} +** +** The [sqlite3_set_authorizer()] interface registers a callback function +** that is invoked to authorizer certain SQL statement actions. The +** second parameter to the callback is an integer code that specifies +** what action is being authorized. These are the integer action codes that +** the authorizer callback may be passed. +** +** These action code values signify what kind of operation is to be +** authorized. The 3rd and 4th parameters to the authorization +** callback function will be parameters or NULL depending on which of these +** codes is used as the second parameter. The 5th parameter to the +** authorizer callback is the name of the database ("main", "temp", +** etc.) if applicable. The 6th parameter to the authorizer callback +** is the name of the inner-most trigger or view that is responsible for +** the access attempt or NULL if this access attempt is directly from +** top-level SQL code. +** +** INVARIANTS: +** +** {F12551} The second parameter to an +** [sqlite3_set_authorizer | authorizer callback is always an integer +** [SQLITE_COPY | authorizer code] that specifies what action +** is being authorized. +** +** {F12552} The 3rd and 4th parameters to the +** [sqlite3_set_authorizer | authorization callback function] +** will be parameters or NULL depending on which +** [SQLITE_COPY | authorizer code] is used as the second parameter. +** +** {F12553} The 5th parameter to the +** [sqlite3_set_authorizer | authorizer callback] is the name +** of the database (example: "main", "temp", etc.) if applicable. +** +** {F12554} The 6th parameter to the +** [sqlite3_set_authorizer | authorizer callback] is the name +** of the inner-most trigger or view that is responsible for +** the access attempt or NULL if this access attempt is directly from +** top-level SQL code. +*/ +/******************************************* 3rd ************ 4th ***********/ +#define SQLITE_CREATE_INDEX 1 /* Index Name Table Name */ +#define SQLITE_CREATE_TABLE 2 /* Table Name NULL */ +#define SQLITE_CREATE_TEMP_INDEX 3 /* Index Name Table Name */ +#define SQLITE_CREATE_TEMP_TABLE 4 /* Table Name NULL */ +#define SQLITE_CREATE_TEMP_TRIGGER 5 /* Trigger Name Table Name */ +#define SQLITE_CREATE_TEMP_VIEW 6 /* View Name NULL */ +#define SQLITE_CREATE_TRIGGER 7 /* Trigger Name Table Name */ +#define SQLITE_CREATE_VIEW 8 /* View Name NULL */ +#define SQLITE_DELETE 9 /* Table Name NULL */ +#define SQLITE_DROP_INDEX 10 /* Index Name Table Name */ +#define SQLITE_DROP_TABLE 11 /* Table Name NULL */ +#define SQLITE_DROP_TEMP_INDEX 12 /* Index Name Table Name */ +#define SQLITE_DROP_TEMP_TABLE 13 /* Table Name NULL */ +#define SQLITE_DROP_TEMP_TRIGGER 14 /* Trigger Name Table Name */ +#define SQLITE_DROP_TEMP_VIEW 15 /* View Name NULL */ +#define SQLITE_DROP_TRIGGER 16 /* Trigger Name Table Name */ +#define SQLITE_DROP_VIEW 17 /* View Name NULL */ +#define SQLITE_INSERT 18 /* Table Name NULL */ +#define SQLITE_PRAGMA 19 /* Pragma Name 1st arg or NULL */ +#define SQLITE_READ 20 /* Table Name Column Name */ +#define SQLITE_SELECT 21 /* NULL NULL */ +#define SQLITE_TRANSACTION 22 /* NULL NULL */ +#define SQLITE_UPDATE 23 /* Table Name Column Name */ +#define SQLITE_ATTACH 24 /* Filename NULL */ +#define SQLITE_DETACH 25 /* Database Name NULL */ +#define SQLITE_ALTER_TABLE 26 /* Database Name Table Name */ +#define SQLITE_REINDEX 27 /* Index Name NULL */ +#define SQLITE_ANALYZE 28 /* Table Name NULL */ +#define SQLITE_CREATE_VTABLE 29 /* Table Name Module Name */ +#define SQLITE_DROP_VTABLE 30 /* Table Name Module Name */ +#define SQLITE_FUNCTION 31 /* Function Name NULL */ +#define SQLITE_COPY 0 /* No longer used */ + +/* +** CAPI3REF: Tracing And Profiling Functions {F12280} +** +** These routines register callback functions that can be used for +** tracing and profiling the execution of SQL statements. +** +** The callback function registered by sqlite3_trace() is invoked at +** various times when an SQL statement is being run by [sqlite3_step()]. +** The callback returns a UTF-8 rendering of the SQL statement text +** as the statement first begins executing. Additional callbacks occur +** as each triggersubprogram is entered. The callbacks for triggers +** contain a UTF-8 SQL comment that identifies the trigger. +** +** The callback function registered by sqlite3_profile() is invoked +** as each SQL statement finishes. The profile callback contains +** the original statement text and an estimate of wall-clock time +** of how long that statement took to run. +** +** The sqlite3_profile() API is currently considered experimental and +** is subject to change or removal in a future release. +** +** The trigger reporting feature of the trace callback is considered +** experimental and is subject to change or removal in future releases. +** Future versions of SQLite might also add new trace callback +** invocations. +** +** INVARIANTS: +** +** {F12281} The callback function registered by [sqlite3_trace()] is +** whenever an SQL statement first begins to execute and +** whenever a trigger subprogram first begins to run. +** +** {F12282} Each call to [sqlite3_trace()] overrides the previously +** registered trace callback. +** +** {F12283} A NULL trace callback disables tracing. +** +** {F12284} The first argument to the trace callback is a copy of +** the pointer which was the 3rd argument to [sqlite3_trace()]. +** +** {F12285} The second argument to the trace callback is a +** zero-terminated UTF8 string containing the original text +** of the SQL statement as it was passed into [sqlite3_prepare_v2()] +** or the equivalent, or an SQL comment indicating the beginning +** of a trigger subprogram. +** +** {F12287} The callback function registered by [sqlite3_profile()] is invoked +** as each SQL statement finishes. +** +** {F12288} The first parameter to the profile callback is a copy of +** the 3rd parameter to [sqlite3_profile()]. +** +** {F12289} The second parameter to the profile callback is a +** zero-terminated UTF-8 string that contains the complete text of +** the SQL statement as it was processed by [sqlite3_prepare_v2()] +** or the equivalent. +** +** {F12290} The third parameter to the profile callback is an estimate +** of the number of nanoseconds of wall-clock time required to +** run the SQL statement from start to finish. +*/ +void *sqlite3_trace(sqlite3*, void(*xTrace)(void*,const char*), void*); +void *sqlite3_profile(sqlite3*, + void(*xProfile)(void*,const char*,sqlite3_uint64), void*); + +/* +** CAPI3REF: Query Progress Callbacks {F12910} +** +** This routine configures a callback function - the +** progress callback - that is invoked periodically during long +** running calls to [sqlite3_exec()], [sqlite3_step()] and +** [sqlite3_get_table()]. An example use for this +** interface is to keep a GUI updated during a large query. +** +** If the progress callback returns non-zero, the opertion is +** interrupted. This feature can be used to implement a +** "Cancel" button on a GUI dialog box. +** +** INVARIANTS: +** +** {F12911} The callback function registered by [sqlite3_progress_handler()] +** is invoked periodically during long running calls to +** [sqlite3_step()]. +** +** {F12912} The progress callback is invoked once for every N virtual +** machine opcodes, where N is the second argument to +** the [sqlite3_progress_handler()] call that registered +** the callback. <todo>What if N is less than 1?</todo> +** +** {F12913} The progress callback itself is identified by the third +** argument to [sqlite3_progress_handler()]. +** +** {F12914} The fourth argument [sqlite3_progress_handler()] is a +*** void pointer passed to the progress callback +** function each time it is invoked. +** +** {F12915} If a call to [sqlite3_step()] results in fewer than +** N opcodes being executed, +** then the progress callback is never invoked. {END} +** +** {F12916} Every call to [sqlite3_progress_handler()] +** overwrites any previously registere progress handler. +** +** {F12917} If the progress handler callback is NULL then no progress +** handler is invoked. +** +** {F12918} If the progress callback returns a result other than 0, then +** the behavior is a if [sqlite3_interrupt()] had been called. +*/ +void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*); + +/* +** CAPI3REF: Opening A New Database Connection {F12700} +** +** These routines open an SQLite database file whose name +** is given by the filename argument. +** The filename argument is interpreted as UTF-8 +** for [sqlite3_open()] and [sqlite3_open_v2()] and as UTF-16 +** in the native byte order for [sqlite3_open16()]. +** An [sqlite3*] handle is usually returned in *ppDb, even +** if an error occurs. The only exception is if SQLite is unable +** to allocate memory to hold the [sqlite3] object, a NULL will +** be written into *ppDb instead of a pointer to the [sqlite3] object. +** If the database is opened (and/or created) +** successfully, then [SQLITE_OK] is returned. Otherwise an +** error code is returned. The +** [sqlite3_errmsg()] or [sqlite3_errmsg16()] routines can be used to obtain +** an English language description of the error. +** +** The default encoding for the database will be UTF-8 if +** [sqlite3_open()] or [sqlite3_open_v2()] is called and +** UTF-16 in the native byte order if [sqlite3_open16()] is used. +** +** Whether or not an error occurs when it is opened, resources +** associated with the [sqlite3*] handle should be released by passing it +** to [sqlite3_close()] when it is no longer required. +** +** The [sqlite3_open_v2()] interface works like [sqlite3_open()] +** except that it acccepts two additional parameters for additional control +** over the new database connection. The flags parameter can be +** one of: +** +** <ol> +** <li> [SQLITE_OPEN_READONLY] +** <li> [SQLITE_OPEN_READWRITE] +** <li> [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE] +** </ol> +** +** The first value opens the database read-only. +** If the database does not previously exist, an error is returned. +** The second option opens +** the database for reading and writing if possible, or reading only if +** if the file is write protected. In either case the database +** must already exist or an error is returned. The third option +** opens the database for reading and writing and creates it if it does +** not already exist. +** The third options is behavior that is always used for [sqlite3_open()] +** and [sqlite3_open16()]. +** +** If the 3rd parameter to [sqlite3_open_v2()] is not one of the +** combinations shown above then the behavior is undefined. +** +** If the filename is ":memory:", then an private +** in-memory database is created for the connection. This in-memory +** database will vanish when the database connection is closed. Future +** version of SQLite might make use of additional special filenames +** that begin with the ":" character. It is recommended that +** when a database filename really does begin with +** ":" that you prefix the filename with a pathname like "./" to +** avoid ambiguity. +** +** If the filename is an empty string, then a private temporary +** on-disk database will be created. This private database will be +** automatically deleted as soon as the database connection is closed. +** +** The fourth parameter to sqlite3_open_v2() is the name of the +** [sqlite3_vfs] object that defines the operating system +** interface that the new database connection should use. If the +** fourth parameter is a NULL pointer then the default [sqlite3_vfs] +** object is used. +** +** <b>Note to windows users:</b> The encoding used for the filename argument +** of [sqlite3_open()] and [sqlite3_open_v2()] must be UTF-8, not whatever +** codepage is currently defined. Filenames containing international +** characters must be converted to UTF-8 prior to passing them into +** [sqlite3_open()] or [sqlite3_open_v2()]. +** +** INVARIANTS: +** +** {F12701} The [sqlite3_open()], [sqlite3_open16()], and +** [sqlite3_open_v2()] interfaces create a new +** [database connection] associated with +** the database file given in their first parameter. +** +** {F12702} The filename argument is interpreted as UTF-8 +** for [sqlite3_open()] and [sqlite3_open_v2()] and as UTF-16 +** in the native byte order for [sqlite3_open16()]. +** +** {F12703} A successful invocation of [sqlite3_open()], [sqlite3_open16()], +** or [sqlite3_open_v2()] writes a pointer to a new +** [database connection] into *ppDb. +** +** {F12704} The [sqlite3_open()], [sqlite3_open16()], and +** [sqlite3_open_v2()] interfaces return [SQLITE_OK] upon success, +** or an appropriate [error code] on failure. +** +** {F12706} The default text encoding for a new database created using +** [sqlite3_open()] or [sqlite3_open_v2()] will be UTF-8. +** +** {F12707} The default text encoding for a new database created using +** [sqlite3_open16()] will be UTF-16. +** +** {F12709} The [sqlite3_open(F,D)] interface is equivalent to +** [sqlite3_open_v2(F,D,G,0)] where the G parameter is +** [SQLITE_OPEN_READWRITE]|[SQLITE_OPEN_CREATE]. +** +** {F12711} If the G parameter to [sqlite3_open_v2(F,D,G,V)] contains the +** bit value [SQLITE_OPEN_READONLY] then the database is opened +** for reading only. +** +** {F12712} If the G parameter to [sqlite3_open_v2(F,D,G,V)] contains the +** bit value [SQLITE_OPEN_READWRITE] then the database is opened +** reading and writing if possible, or for reading only if the +** file is write protected by the operating system. +** +** {F12713} If the G parameter to [sqlite3_open(v2(F,D,G,V)] omits the +** bit value [SQLITE_OPEN_CREATE] and the database does not +** previously exist, an error is returned. +** +** {F12714} If the G parameter to [sqlite3_open(v2(F,D,G,V)] contains the +** bit value [SQLITE_OPEN_CREATE] and the database does not +** previously exist, then an attempt is made to create and +** initialize the database. +** +** {F12717} If the filename argument to [sqlite3_open()], [sqlite3_open16()], +** or [sqlite3_open_v2()] is ":memory:", then an private, +** ephemeral, in-memory database is created for the connection. +** <todo>Is SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE required +** in sqlite3_open_v2()?</todo> +** +** {F12719} If the filename is NULL or an empty string, then a private, +** ephermeral on-disk database will be created. +** <todo>Is SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE required +** in sqlite3_open_v2()?</todo> +** +** {F12721} The [database connection] created by +** [sqlite3_open_v2(F,D,G,V)] will use the +** [sqlite3_vfs] object identified by the V parameter, or +** the default [sqlite3_vfs] object is V is a NULL pointer. +*/ +int sqlite3_open( + const char *filename, /* Database filename (UTF-8) */ + sqlite3 **ppDb /* OUT: SQLite db handle */ +); +int sqlite3_open16( + const void *filename, /* Database filename (UTF-16) */ + sqlite3 **ppDb /* OUT: SQLite db handle */ +); +int sqlite3_open_v2( + const char *filename, /* Database filename (UTF-8) */ + sqlite3 **ppDb, /* OUT: SQLite db handle */ + int flags, /* Flags */ + const char *zVfs /* Name of VFS module to use */ +); + +/* +** CAPI3REF: Error Codes And Messages {F12800} +** +** The sqlite3_errcode() interface returns the numeric +** [SQLITE_OK | result code] or [SQLITE_IOERR_READ | extended result code] +** for the most recent failed sqlite3_* API call associated +** with [sqlite3] handle 'db'. If a prior API call failed but the +** most recent API call succeeded, the return value from sqlite3_errcode() +** is undefined. +** +** The sqlite3_errmsg() and sqlite3_errmsg16() return English-language +** text that describes the error, as either UTF8 or UTF16 respectively. +** Memory to hold the error message string is managed internally. +** The application does not need to worry with freeing the result. +** However, the error string might be overwritten or deallocated by +** subsequent calls to other SQLite interface functions. +** +** INVARIANTS: +** +** {F12801} The [sqlite3_errcode(D)] interface returns the numeric +** [SQLITE_OK | result code] or +** [SQLITE_IOERR_READ | extended result code] +** for the most recently failed interface call associated +** with [database connection] D. +** +** {F12803} The [sqlite3_errmsg(D)] and [sqlite3_errmsg16(D)] +** interfaces return English-language text that describes +** the error in the mostly recently failed interface call, +** encoded as either UTF8 or UTF16 respectively. +** +** {F12807} The strings returned by [sqlite3_errmsg()] and [sqlite3_errmsg16()] +** are valid until the next SQLite interface call. +** +** {F12808} Calls to API routines that do not return an error code +** (example: [sqlite3_data_count()]) do not +** change the error code or message returned by +** [sqlite3_errcode()], [sqlite3_errmsg()], or [sqlite3_errmsg16()]. +** +** {F12809} Interfaces that are not associated with a specific +** [database connection] (examples: +** [sqlite3_mprintf()] or [sqlite3_enable_shared_cache()] +** do not change the values returned by +** [sqlite3_errcode()], [sqlite3_errmsg()], or [sqlite3_errmsg16()]. +*/ +int sqlite3_errcode(sqlite3 *db); +const char *sqlite3_errmsg(sqlite3*); +const void *sqlite3_errmsg16(sqlite3*); + +/* +** CAPI3REF: SQL Statement Object {F13000} +** KEYWORDS: {prepared statement} {prepared statements} +** +** An instance of this object represent single SQL statements. This +** object is variously known as a "prepared statement" or a +** "compiled SQL statement" or simply as a "statement". +** +** The life of a statement object goes something like this: +** +** <ol> +** <li> Create the object using [sqlite3_prepare_v2()] or a related +** function. +** <li> Bind values to host parameters using +** [sqlite3_bind_blob | sqlite3_bind_* interfaces]. +** <li> Run the SQL by calling [sqlite3_step()] one or more times. +** <li> Reset the statement using [sqlite3_reset()] then go back +** to step 2. Do this zero or more times. +** <li> Destroy the object using [sqlite3_finalize()]. +** </ol> +** +** Refer to documentation on individual methods above for additional +** information. +*/ +typedef struct sqlite3_stmt sqlite3_stmt; + +/* +** CAPI3REF: Run-time Limits {F12760} +** +** This interface allows the size of various constructs to be limited +** on a connection by connection basis. The first parameter is the +** [database connection] whose limit is to be set or queried. The +** second parameter is one of the [limit categories] that define a +** class of constructs to be size limited. The third parameter is the +** new limit for that construct. The function returns the old limit. +** +** If the new limit is a negative number, the limit is unchanged. +** For the limit category of SQLITE_LIMIT_XYZ there is a hard upper +** bound set by a compile-time C-preprocess macro named SQLITE_MAX_XYZ. +** (The "_LIMIT_" in the name is changed to "_MAX_".) +** Attempts to increase a limit above its hard upper bound are +** silently truncated to the hard upper limit. +** +** Run time limits are intended for use in applications that manage +** both their own internal database and also databases that are controlled +** by untrusted external sources. An example application might be a +** webbrowser that has its own databases for storing history and +** separate databases controlled by javascript applications downloaded +** off the internet. The internal databases can be given the +** large, default limits. Databases managed by external sources can +** be given much smaller limits designed to prevent a denial of service +** attach. Developers might also want to use the [sqlite3_set_authorizer()] +** interface to further control untrusted SQL. The size of the database +** created by an untrusted script can be contained using the +** [max_page_count] [PRAGMA]. +** +** This interface is currently considered experimental and is subject +** to change or removal without prior notice. +** +** INVARIANTS: +** +** {F12762} A successful call to [sqlite3_limit(D,C,V)] where V is +** positive changes the +** limit on the size of construct C in [database connection] D +** to the lessor of V and the hard upper bound on the size +** of C that is set at compile-time. +** +** {F12766} A successful call to [sqlite3_limit(D,C,V)] where V is negative +** leaves the state of [database connection] D unchanged. +** +** {F12769} A successful call to [sqlite3_limit(D,C,V)] returns the +** value of the limit on the size of construct C in +** in [database connection] D as it was prior to the call. +*/ +int sqlite3_limit(sqlite3*, int id, int newVal); + +/* +** CAPI3REF: Run-Time Limit Categories {F12790} +** KEYWORDS: {limit category} {limit categories} +** +** These constants define various aspects of a [database connection] +** that can be limited in size by calls to [sqlite3_limit()]. +** The meanings of the various limits are as follows: +** +** <dl> +** <dt>SQLITE_LIMIT_LENGTH</dt> +** <dd>The maximum size of any +** string or blob or table row.<dd> +** +** <dt>SQLITE_LIMIT_SQL_LENGTH</dt> +** <dd>The maximum length of an SQL statement.</dd> +** +** <dt>SQLITE_LIMIT_COLUMN</dt> +** <dd>The maximum number of columns in a table definition or in the +** result set of a SELECT or the maximum number of columns in an index +** or in an ORDER BY or GROUP BY clause.</dd> +** +** <dt>SQLITE_LIMIT_EXPR_DEPTH</dt> +** <dd>The maximum depth of the parse tree on any expression.</dd> +** +** <dt>SQLITE_LIMIT_COMPOUND_SELECT</dt> +** <dd>The maximum number of terms in a compound SELECT statement.</dd> +** +** <dt>SQLITE_LIMIT_VDBE_OP</dt> +** <dd>The maximum number of instructions in a virtual machine program +** used to implement an SQL statement.</dd> +** +** <dt>SQLITE_LIMIT_FUNCTION_ARG</dt> +** <dd>The maximum number of arguments on a function.</dd> +** +** <dt>SQLITE_LIMIT_ATTACHED</dt> +** <dd>The maximum number of attached databases.</dd> +** +** <dt>SQLITE_LIMIT_LIKE_PATTERN_LENGTH</dt> +** <dd>The maximum length of the pattern argument to the LIKE or +** GLOB operators.</dd> +** +** <dt>SQLITE_LIMIT_VARIABLE_NUMBER</dt> +** <dd>The maximum number of variables in an SQL statement that can +** be bound.</dd> +** </dl> +*/ +#define SQLITE_LIMIT_LENGTH 0 +#define SQLITE_LIMIT_SQL_LENGTH 1 +#define SQLITE_LIMIT_COLUMN 2 +#define SQLITE_LIMIT_EXPR_DEPTH 3 +#define SQLITE_LIMIT_COMPOUND_SELECT 4 +#define SQLITE_LIMIT_VDBE_OP 5 +#define SQLITE_LIMIT_FUNCTION_ARG 6 +#define SQLITE_LIMIT_ATTACHED 7 +#define SQLITE_LIMIT_LIKE_PATTERN_LENGTH 8 +#define SQLITE_LIMIT_VARIABLE_NUMBER 9 + +/* +** CAPI3REF: Compiling An SQL Statement {F13010} +** +** To execute an SQL query, it must first be compiled into a byte-code +** program using one of these routines. +** +** The first argument "db" is an [database connection] +** obtained from a prior call to [sqlite3_open()], [sqlite3_open_v2()] +** or [sqlite3_open16()]. +** The second argument "zSql" is the statement to be compiled, encoded +** as either UTF-8 or UTF-16. The sqlite3_prepare() and sqlite3_prepare_v2() +** interfaces uses UTF-8 and sqlite3_prepare16() and sqlite3_prepare16_v2() +** use UTF-16. {END} +** +** If the nByte argument is less +** than zero, then zSql is read up to the first zero terminator. +** If nByte is non-negative, then it is the maximum number of +** bytes read from zSql. When nByte is non-negative, the +** zSql string ends at either the first '\000' or '\u0000' character or +** the nByte-th byte, whichever comes first. If the caller knows +** that the supplied string is nul-terminated, then there is a small +** performance advantage to be had by passing an nByte parameter that +** is equal to the number of bytes in the input string <i>including</i> +** the nul-terminator bytes.{END} +** +** *pzTail is made to point to the first byte past the end of the +** first SQL statement in zSql. These routines only compiles the first +** statement in zSql, so *pzTail is left pointing to what remains +** uncompiled. +** +** *ppStmt is left pointing to a compiled [prepared statement] that can be +** executed using [sqlite3_step()]. Or if there is an error, *ppStmt is +** set to NULL. If the input text contains no SQL (if the input +** is and empty string or a comment) then *ppStmt is set to NULL. +** {U13018} The calling procedure is responsible for deleting the +** compiled SQL statement +** using [sqlite3_finalize()] after it has finished with it. +** +** On success, [SQLITE_OK] is returned. Otherwise an +** [error code] is returned. +** +** The sqlite3_prepare_v2() and sqlite3_prepare16_v2() interfaces are +** recommended for all new programs. The two older interfaces are retained +** for backwards compatibility, but their use is discouraged. +** In the "v2" interfaces, the prepared statement +** that is returned (the [sqlite3_stmt] object) contains a copy of the +** original SQL text. {END} This causes the [sqlite3_step()] interface to +** behave a differently in two ways: +** +** <ol> +** <li> +** If the database schema changes, instead of returning [SQLITE_SCHEMA] as it +** always used to do, [sqlite3_step()] will automatically recompile the SQL +** statement and try to run it again. If the schema has changed in +** a way that makes the statement no longer valid, [sqlite3_step()] will still +** return [SQLITE_SCHEMA]. But unlike the legacy behavior, +** [SQLITE_SCHEMA] is now a fatal error. Calling +** [sqlite3_prepare_v2()] again will not make the +** error go away. Note: use [sqlite3_errmsg()] to find the text +** of the parsing error that results in an [SQLITE_SCHEMA] return. {END} +** </li> +** +** <li> +** When an error occurs, +** [sqlite3_step()] will return one of the detailed +** [error codes] or [extended error codes]. +** The legacy behavior was that [sqlite3_step()] would only return a generic +** [SQLITE_ERROR] result code and you would have to make a second call to +** [sqlite3_reset()] in order to find the underlying cause of the problem. +** With the "v2" prepare interfaces, the underlying reason for the error is +** returned immediately. +** </li> +** </ol> +** +** INVARIANTS: +** +** {F13011} The [sqlite3_prepare(db,zSql,...)] and +** [sqlite3_prepare_v2(db,zSql,...)] interfaces interpret the +** text in their zSql parameter as UTF-8. +** +** {F13012} The [sqlite3_prepare16(db,zSql,...)] and +** [sqlite3_prepare16_v2(db,zSql,...)] interfaces interpret the +** text in their zSql parameter as UTF-16 in the native byte order. +** +** {F13013} If the nByte argument to [sqlite3_prepare_v2(db,zSql,nByte,...)] +** and its variants is less than zero, then SQL text is +** read from zSql is read up to the first zero terminator. +** +** {F13014} If the nByte argument to [sqlite3_prepare_v2(db,zSql,nByte,...)] +** and its variants is non-negative, then at most nBytes bytes +** SQL text is read from zSql. +** +** {F13015} In [sqlite3_prepare_v2(db,zSql,N,P,pzTail)] and its variants +** if the zSql input text contains more than one SQL statement +** and pzTail is not NULL, then *pzTail is made to point to the +** first byte past the end of the first SQL statement in zSql. +** <todo>What does *pzTail point to if there is one statement?</todo> +** +** {F13016} A successful call to [sqlite3_prepare_v2(db,zSql,N,ppStmt,...)] +** or one of its variants writes into *ppStmt a pointer to a new +** [prepared statement] or a pointer to NULL +** if zSql contains nothing other than whitespace or comments. +** +** {F13019} The [sqlite3_prepare_v2()] interface and its variants return +** [SQLITE_OK] or an appropriate [error code] upon failure. +** +** {F13021} Before [sqlite3_prepare(db,zSql,nByte,ppStmt,pzTail)] or its +** variants returns an error (any value other than [SQLITE_OK]) +** it first sets *ppStmt to NULL. +*/ +int sqlite3_prepare( + sqlite3 *db, /* Database handle */ + const char *zSql, /* SQL statement, UTF-8 encoded */ + int nByte, /* Maximum length of zSql in bytes. */ + sqlite3_stmt **ppStmt, /* OUT: Statement handle */ + const char **pzTail /* OUT: Pointer to unused portion of zSql */ +); +int sqlite3_prepare_v2( + sqlite3 *db, /* Database handle */ + const char *zSql, /* SQL statement, UTF-8 encoded */ + int nByte, /* Maximum length of zSql in bytes. */ + sqlite3_stmt **ppStmt, /* OUT: Statement handle */ + const char **pzTail /* OUT: Pointer to unused portion of zSql */ +); +int sqlite3_prepare16( + sqlite3 *db, /* Database handle */ + const void *zSql, /* SQL statement, UTF-16 encoded */ + int nByte, /* Maximum length of zSql in bytes. */ + sqlite3_stmt **ppStmt, /* OUT: Statement handle */ + const void **pzTail /* OUT: Pointer to unused portion of zSql */ +); +int sqlite3_prepare16_v2( + sqlite3 *db, /* Database handle */ + const void *zSql, /* SQL statement, UTF-16 encoded */ + int nByte, /* Maximum length of zSql in bytes. */ + sqlite3_stmt **ppStmt, /* OUT: Statement handle */ + const void **pzTail /* OUT: Pointer to unused portion of zSql */ +); + +/* +** CAPIREF: Retrieving Statement SQL {F13100} +** +** This intereface can be used to retrieve a saved copy of the original +** SQL text used to create a [prepared statement]. +** +** INVARIANTS: +** +** {F13101} If the [prepared statement] passed as +** the an argument to [sqlite3_sql()] was compiled +** compiled using either [sqlite3_prepare_v2()] or +** [sqlite3_prepare16_v2()], +** then [sqlite3_sql()] function returns a pointer to a +** zero-terminated string containing a UTF-8 rendering +** of the original SQL statement. +** +** {F13102} If the [prepared statement] passed as +** the an argument to [sqlite3_sql()] was compiled +** compiled using either [sqlite3_prepare()] or +** [sqlite3_prepare16()], +** then [sqlite3_sql()] function returns a NULL pointer. +** +** {F13103} The string returned by [sqlite3_sql(S)] is valid until the +** [prepared statement] S is deleted using [sqlite3_finalize(S)]. +*/ +const char *sqlite3_sql(sqlite3_stmt *pStmt); + +/* +** CAPI3REF: Dynamically Typed Value Object {F15000} +** KEYWORDS: {protected sqlite3_value} {unprotected sqlite3_value} +** +** SQLite uses the sqlite3_value object to represent all values +** that can be stored in a database table. +** SQLite uses dynamic typing for the values it stores. +** Values stored in sqlite3_value objects can be +** be integers, floating point values, strings, BLOBs, or NULL. +** +** An sqlite3_value object may be either "protected" or "unprotected". +** Some interfaces require a protected sqlite3_value. Other interfaces +** will accept either a protected or an unprotected sqlite3_value. +** Every interface that accepts sqlite3_value arguments specifies +** whether or not it requires a protected sqlite3_value. +** +** The terms "protected" and "unprotected" refer to whether or not +** a mutex is held. A internal mutex is held for a protected +** sqlite3_value object but no mutex is held for an unprotected +** sqlite3_value object. If SQLite is compiled to be single-threaded +** (with SQLITE_THREADSAFE=0 and with [sqlite3_threadsafe()] returning 0) +** then there is no distinction between +** protected and unprotected sqlite3_value objects and they can be +** used interchangable. However, for maximum code portability it +** is recommended that applications make the distinction between +** between protected and unprotected sqlite3_value objects even if +** they are single threaded. +** +** The sqlite3_value objects that are passed as parameters into the +** implementation of application-defined SQL functions are protected. +** The sqlite3_value object returned by +** [sqlite3_column_value()] is unprotected. +** Unprotected sqlite3_value objects may only be used with +** [sqlite3_result_value()] and [sqlite3_bind_value()]. All other +** interfaces that use sqlite3_value require protected sqlite3_value objects. +*/ +typedef struct Mem sqlite3_value; + +/* +** CAPI3REF: SQL Function Context Object {F16001} +** +** The context in which an SQL function executes is stored in an +** sqlite3_context object. A pointer to an sqlite3_context +** object is always first parameter to application-defined SQL functions. +*/ +typedef struct sqlite3_context sqlite3_context; + +/* +** CAPI3REF: Binding Values To Prepared Statements {F13500} +** +** In the SQL strings input to [sqlite3_prepare_v2()] and its +** variants, literals may be replace by a parameter in one +** of these forms: +** +** <ul> +** <li> ? +** <li> ?NNN +** <li> :VVV +** <li> @VVV +** <li> $VVV +** </ul> +** +** In the parameter forms shown above NNN is an integer literal, +** VVV alpha-numeric parameter name. +** The values of these parameters (also called "host parameter names" +** or "SQL parameters") +** can be set using the sqlite3_bind_*() routines defined here. +** +** The first argument to the sqlite3_bind_*() routines always +** is a pointer to the [sqlite3_stmt] object returned from +** [sqlite3_prepare_v2()] or its variants. The second +** argument is the index of the parameter to be set. The +** first parameter has an index of 1. When the same named +** parameter is used more than once, second and subsequent +** occurrences have the same index as the first occurrence. +** The index for named parameters can be looked up using the +** [sqlite3_bind_parameter_name()] API if desired. The index +** for "?NNN" parameters is the value of NNN. +** The NNN value must be between 1 and the compile-time +** parameter SQLITE_MAX_VARIABLE_NUMBER (default value: 999). +** +** The third argument is the value to bind to the parameter. +** +** In those +** routines that have a fourth argument, its value is the number of bytes +** in the parameter. To be clear: the value is the number of <u>bytes</u> +** in the value, not the number of characters. +** If the fourth parameter is negative, the length of the string is +** number of bytes up to the first zero terminator. +** +** The fifth argument to sqlite3_bind_blob(), sqlite3_bind_text(), and +** sqlite3_bind_text16() is a destructor used to dispose of the BLOB or +** string after SQLite has finished with it. If the fifth argument is +** the special value [SQLITE_STATIC], then SQLite assumes that the +** information is in static, unmanaged space and does not need to be freed. +** If the fifth argument has the value [SQLITE_TRANSIENT], then +** SQLite makes its own private copy of the data immediately, before +** the sqlite3_bind_*() routine returns. +** +** The sqlite3_bind_zeroblob() routine binds a BLOB of length N that +** is filled with zeros. A zeroblob uses a fixed amount of memory +** (just an integer to hold it size) while it is being processed. +** Zeroblobs are intended to serve as place-holders for BLOBs whose +** content is later written using +** [sqlite3_blob_open | increment BLOB I/O] routines. A negative +** value for the zeroblob results in a zero-length BLOB. +** +** The sqlite3_bind_*() routines must be called after +** [sqlite3_prepare_v2()] (and its variants) or [sqlite3_reset()] and +** before [sqlite3_step()]. +** Bindings are not cleared by the [sqlite3_reset()] routine. +** Unbound parameters are interpreted as NULL. +** +** These routines return [SQLITE_OK] on success or an error code if +** anything goes wrong. [SQLITE_RANGE] is returned if the parameter +** index is out of range. [SQLITE_NOMEM] is returned if malloc fails. +** [SQLITE_MISUSE] might be returned if these routines are called on a +** virtual machine that is the wrong state or which has already been finalized. +** Detection of misuse is unreliable. Applications should not depend +** on SQLITE_MISUSE returns. SQLITE_MISUSE is intended to indicate a +** a logic error in the application. Future versions of SQLite might +** panic rather than return SQLITE_MISUSE. +** +** See also: [sqlite3_bind_parameter_count()], +** [sqlite3_bind_parameter_name()], and +** [sqlite3_bind_parameter_index()]. +** +** INVARIANTS: +** +** {F13506} The [sqlite3_prepare | SQL statement compiler] recognizes +** tokens of the forms "?", "?NNN", "$VVV", ":VVV", and "@VVV" +** as SQL parameters, where NNN is any sequence of one or more +** digits and where VVV is any sequence of one or more +** alphanumeric characters or "::" optionally followed by +** a string containing no spaces and contained within parentheses. +** +** {F13509} The initial value of an SQL parameter is NULL. +** +** {F13512} The index of an "?" SQL parameter is one larger than the +** largest index of SQL parameter to the left, or 1 if +** the "?" is the leftmost SQL parameter. +** +** {F13515} The index of an "?NNN" SQL parameter is the integer NNN. +** +** {F13518} The index of an ":VVV", "$VVV", or "@VVV" SQL parameter is +** the same as the index of leftmost occurances of the same +** parameter, or one more than the largest index over all +** parameters to the left if this is the first occurrance +** of this parameter, or 1 if this is the leftmost parameter. +** +** {F13521} The [sqlite3_prepare | SQL statement compiler] fail with +** an [SQLITE_RANGE] error if the index of an SQL parameter +** is less than 1 or greater than SQLITE_MAX_VARIABLE_NUMBER. +** +** {F13524} Calls to [sqlite3_bind_text | sqlite3_bind(S,N,V,...)] +** associate the value V with all SQL parameters having an +** index of N in the [prepared statement] S. +** +** {F13527} Calls to [sqlite3_bind_text | sqlite3_bind(S,N,...)] +** override prior calls with the same values of S and N. +** +** {F13530} Bindings established by [sqlite3_bind_text | sqlite3_bind(S,...)] +** persist across calls to [sqlite3_reset(S)]. +** +** {F13533} In calls to [sqlite3_bind_blob(S,N,V,L,D)], +** [sqlite3_bind_text(S,N,V,L,D)], or +** [sqlite3_bind_text16(S,N,V,L,D)] SQLite binds the first L +** bytes of the blob or string pointed to by V, when L +** is non-negative. +** +** {F13536} In calls to [sqlite3_bind_text(S,N,V,L,D)] or +** [sqlite3_bind_text16(S,N,V,L,D)] SQLite binds characters +** from V through the first zero character when L is negative. +** +** {F13539} In calls to [sqlite3_bind_blob(S,N,V,L,D)], +** [sqlite3_bind_text(S,N,V,L,D)], or +** [sqlite3_bind_text16(S,N,V,L,D)] when D is the special +** constant [SQLITE_STATIC], SQLite assumes that the value V +** is held in static unmanaged space that will not change +** during the lifetime of the binding. +** +** {F13542} In calls to [sqlite3_bind_blob(S,N,V,L,D)], +** [sqlite3_bind_text(S,N,V,L,D)], or +** [sqlite3_bind_text16(S,N,V,L,D)] when D is the special +** constant [SQLITE_TRANSIENT], the routine makes a +** private copy of V value before it returns. +** +** {F13545} In calls to [sqlite3_bind_blob(S,N,V,L,D)], +** [sqlite3_bind_text(S,N,V,L,D)], or +** [sqlite3_bind_text16(S,N,V,L,D)] when D is a pointer to +** a function, SQLite invokes that function to destroy the +** V value after it has finished using the V value. +** +** {F13548} In calls to [sqlite3_bind_zeroblob(S,N,V,L)] the value bound +** is a blob of L bytes, or a zero-length blob if L is negative. +** +** {F13551} In calls to [sqlite3_bind_value(S,N,V)] the V argument may +** be either a [protected sqlite3_value] object or an +** [unprotected sqlite3_value] object. +*/ +int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*)); +int sqlite3_bind_double(sqlite3_stmt*, int, double); +int sqlite3_bind_int(sqlite3_stmt*, int, int); +int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite3_int64); +int sqlite3_bind_null(sqlite3_stmt*, int); +int sqlite3_bind_text(sqlite3_stmt*, int, const char*, int n, void(*)(void*)); +int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int, void(*)(void*)); +int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*); +int sqlite3_bind_zeroblob(sqlite3_stmt*, int, int n); + +/* +** CAPI3REF: Number Of SQL Parameters {F13600} +** +** This routine can be used to find the number of SQL parameters +** in a prepared statement. SQL parameters are tokens of the +** form "?", "?NNN", ":AAA", "$AAA", or "@AAA" that serve as +** place-holders for values that are [sqlite3_bind_blob | bound] +** to the parameters at a later time. +** +** This routine actually returns the index of the largest parameter. +** For all forms except ?NNN, this will correspond to the number of +** unique parameters. If parameters of the ?NNN are used, there may +** be gaps in the list. +** +** See also: [sqlite3_bind_blob|sqlite3_bind()], +** [sqlite3_bind_parameter_name()], and +** [sqlite3_bind_parameter_index()]. +** +** INVARIANTS: +** +** {F13601} The [sqlite3_bind_parameter_count(S)] interface returns +** the largest index of all SQL parameters in the +** [prepared statement] S, or 0 if S +** contains no SQL parameters. +*/ +int sqlite3_bind_parameter_count(sqlite3_stmt*); + +/* +** CAPI3REF: Name Of A Host Parameter {F13620} +** +** This routine returns a pointer to the name of the n-th +** SQL parameter in a [prepared statement]. +** SQL parameters of the form "?NNN" or ":AAA" or "@AAA" or "$AAA" +** have a name which is the string "?NNN" or ":AAA" or "@AAA" or "$AAA" +** respectively. +** In other words, the initial ":" or "$" or "@" or "?" +** is included as part of the name. +** Parameters of the form "?" without a following integer have no name. +** +** The first host parameter has an index of 1, not 0. +** +** If the value n is out of range or if the n-th parameter is +** nameless, then NULL is returned. The returned string is +** always in the UTF-8 encoding even if the named parameter was +** originally specified as UTF-16 in [sqlite3_prepare16()] or +** [sqlite3_prepare16_v2()]. +** +** See also: [sqlite3_bind_blob|sqlite3_bind()], +** [sqlite3_bind_parameter_count()], and +** [sqlite3_bind_parameter_index()]. +** +** INVARIANTS: +** +** {F13621} The [sqlite3_bind_parameter_name(S,N)] interface returns +** a UTF-8 rendering of the name of the SQL parameter in +** [prepared statement] S having index N, or +** NULL if there is no SQL parameter with index N or if the +** parameter with index N is an anonymous parameter "?". +*/ +const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int); + +/* +** CAPI3REF: Index Of A Parameter With A Given Name {F13640} +** +** Return the index of an SQL parameter given its name. The +** index value returned is suitable for use as the second +** parameter to [sqlite3_bind_blob|sqlite3_bind()]. A zero +** is returned if no matching parameter is found. The parameter +** name must be given in UTF-8 even if the original statement +** was prepared from UTF-16 text using [sqlite3_prepare16_v2()]. +** +** See also: [sqlite3_bind_blob|sqlite3_bind()], +** [sqlite3_bind_parameter_count()], and +** [sqlite3_bind_parameter_index()]. +** +** INVARIANTS: +** +** {F13641} The [sqlite3_bind_parameter_index(S,N)] interface returns +** the index of SQL parameter in [prepared statement] +** S whose name matches the UTF-8 string N, or 0 if there is +** no match. +*/ +int sqlite3_bind_parameter_index(sqlite3_stmt*, const char *zName); + +/* +** CAPI3REF: Reset All Bindings On A Prepared Statement {F13660} +** +** Contrary to the intuition of many, [sqlite3_reset()] does not +** reset the [sqlite3_bind_blob | bindings] on a +** [prepared statement]. Use this routine to +** reset all host parameters to NULL. +** +** INVARIANTS: +** +** {F13661} The [sqlite3_clear_bindings(S)] interface resets all +** SQL parameter bindings in [prepared statement] S +** back to NULL. +*/ +int sqlite3_clear_bindings(sqlite3_stmt*); + +/* +** CAPI3REF: Number Of Columns In A Result Set {F13710} +** +** Return the number of columns in the result set returned by the +** [prepared statement]. This routine returns 0 +** if pStmt is an SQL statement that does not return data (for +** example an UPDATE). +** +** INVARIANTS: +** +** {F13711} The [sqlite3_column_count(S)] interface returns the number of +** columns in the result set generated by the +** [prepared statement] S, or 0 if S does not generate +** a result set. +*/ +int sqlite3_column_count(sqlite3_stmt *pStmt); + +/* +** CAPI3REF: Column Names In A Result Set {F13720} +** +** These routines return the name assigned to a particular column +** in the result set of a SELECT statement. The sqlite3_column_name() +** interface returns a pointer to a zero-terminated UTF8 string +** and sqlite3_column_name16() returns a pointer to a zero-terminated +** UTF16 string. The first parameter is the +** [prepared statement] that implements the SELECT statement. +** The second parameter is the column number. The left-most column is +** number 0. +** +** The returned string pointer is valid until either the +** [prepared statement] is destroyed by [sqlite3_finalize()] +** or until the next call sqlite3_column_name() or sqlite3_column_name16() +** on the same column. +** +** If sqlite3_malloc() fails during the processing of either routine +** (for example during a conversion from UTF-8 to UTF-16) then a +** NULL pointer is returned. +** +** The name of a result column is the value of the "AS" clause for +** that column, if there is an AS clause. If there is no AS clause +** then the name of the column is unspecified and may change from +** one release of SQLite to the next. +** +** INVARIANTS: +** +** {F13721} A successful invocation of the [sqlite3_column_name(S,N)] +** interface returns the name +** of the Nth column (where 0 is the left-most column) for the +** result set of [prepared statement] S as a +** zero-terminated UTF-8 string. +** +** {F13723} A successful invocation of the [sqlite3_column_name16(S,N)] +** interface returns the name +** of the Nth column (where 0 is the left-most column) for the +** result set of [prepared statement] S as a +** zero-terminated UTF-16 string in the native byte order. +** +** {F13724} The [sqlite3_column_name()] and [sqlite3_column_name16()] +** interfaces return a NULL pointer if they are unable to +** allocate memory memory to hold there normal return strings. +** +** {F13725} If the N parameter to [sqlite3_column_name(S,N)] or +** [sqlite3_column_name16(S,N)] is out of range, then the +** interfaces returns a NULL pointer. +** +** {F13726} The strings returned by [sqlite3_column_name(S,N)] and +** [sqlite3_column_name16(S,N)] are valid until the next +** call to either routine with the same S and N parameters +** or until [sqlite3_finalize(S)] is called. +** +** {F13727} When a result column of a [SELECT] statement contains +** an AS clause, the name of that column is the indentifier +** to the right of the AS keyword. +*/ +const char *sqlite3_column_name(sqlite3_stmt*, int N); +const void *sqlite3_column_name16(sqlite3_stmt*, int N); + +/* +** CAPI3REF: Source Of Data In A Query Result {F13740} +** +** These routines provide a means to determine what column of what +** table in which database a result of a SELECT statement comes from. +** The name of the database or table or column can be returned as +** either a UTF8 or UTF16 string. The _database_ routines return +** the database name, the _table_ routines return the table name, and +** the origin_ routines return the column name. +** The returned string is valid until +** the [prepared statement] is destroyed using +** [sqlite3_finalize()] or until the same information is requested +** again in a different encoding. +** +** The names returned are the original un-aliased names of the +** database, table, and column. +** +** The first argument to the following calls is a [prepared statement]. +** These functions return information about the Nth column returned by +** the statement, where N is the second function argument. +** +** If the Nth column returned by the statement is an expression +** or subquery and is not a column value, then all of these functions +** return NULL. These routine might also return NULL if a memory +** allocation error occurs. Otherwise, they return the +** name of the attached database, table and column that query result +** column was extracted from. +** +** As with all other SQLite APIs, those postfixed with "16" return +** UTF-16 encoded strings, the other functions return UTF-8. {END} +** +** These APIs are only available if the library was compiled with the +** SQLITE_ENABLE_COLUMN_METADATA preprocessor symbol defined. +** +** {U13751} +** If two or more threads call one or more of these routines against the same +** prepared statement and column at the same time then the results are +** undefined. +** +** INVARIANTS: +** +** {F13741} The [sqlite3_column_database_name(S,N)] interface returns either +** the UTF-8 zero-terminated name of the database from which the +** Nth result column of [prepared statement] S +** is extracted, or NULL if the the Nth column of S is a +** general expression or if unable to allocate memory +** to store the name. +** +** {F13742} The [sqlite3_column_database_name16(S,N)] interface returns either +** the UTF-16 native byte order +** zero-terminated name of the database from which the +** Nth result column of [prepared statement] S +** is extracted, or NULL if the the Nth column of S is a +** general expression or if unable to allocate memory +** to store the name. +** +** {F13743} The [sqlite3_column_table_name(S,N)] interface returns either +** the UTF-8 zero-terminated name of the table from which the +** Nth result column of [prepared statement] S +** is extracted, or NULL if the the Nth column of S is a +** general expression or if unable to allocate memory +** to store the name. +** +** {F13744} The [sqlite3_column_table_name16(S,N)] interface returns either +** the UTF-16 native byte order +** zero-terminated name of the table from which the +** Nth result column of [prepared statement] S +** is extracted, or NULL if the the Nth column of S is a +** general expression or if unable to allocate memory +** to store the name. +** +** {F13745} The [sqlite3_column_origin_name(S,N)] interface returns either +** the UTF-8 zero-terminated name of the table column from which the +** Nth result column of [prepared statement] S +** is extracted, or NULL if the the Nth column of S is a +** general expression or if unable to allocate memory +** to store the name. +** +** {F13746} The [sqlite3_column_origin_name16(S,N)] interface returns either +** the UTF-16 native byte order +** zero-terminated name of the table column from which the +** Nth result column of [prepared statement] S +** is extracted, or NULL if the the Nth column of S is a +** general expression or if unable to allocate memory +** to store the name. +** +** {F13748} The return values from +** [sqlite3_column_database_name|column metadata interfaces] +** are valid +** for the lifetime of the [prepared statement] +** or until the encoding is changed by another metadata +** interface call for the same prepared statement and column. +** +** LIMITATIONS: +** +** {U13751} If two or more threads call one or more +** [sqlite3_column_database_name|column metadata interfaces] +** the same [prepared statement] and result column +** at the same time then the results are undefined. +*/ +const char *sqlite3_column_database_name(sqlite3_stmt*,int); +const void *sqlite3_column_database_name16(sqlite3_stmt*,int); +const char *sqlite3_column_table_name(sqlite3_stmt*,int); +const void *sqlite3_column_table_name16(sqlite3_stmt*,int); +const char *sqlite3_column_origin_name(sqlite3_stmt*,int); +const void *sqlite3_column_origin_name16(sqlite3_stmt*,int); + +/* +** CAPI3REF: Declared Datatype Of A Query Result {F13760} +** +** The first parameter is a [prepared statement]. +** If this statement is a SELECT statement and the Nth column of the +** returned result set of that SELECT is a table column (not an +** expression or subquery) then the declared type of the table +** column is returned. If the Nth column of the result set is an +** expression or subquery, then a NULL pointer is returned. +** The returned string is always UTF-8 encoded. {END} +** For example, in the database schema: +** +** CREATE TABLE t1(c1 VARIANT); +** +** And the following statement compiled: +** +** SELECT c1 + 1, c1 FROM t1; +** +** Then this routine would return the string "VARIANT" for the second +** result column (i==1), and a NULL pointer for the first result column +** (i==0). +** +** SQLite uses dynamic run-time typing. So just because a column +** is declared to contain a particular type does not mean that the +** data stored in that column is of the declared type. SQLite is +** strongly typed, but the typing is dynamic not static. Type +** is associated with individual values, not with the containers +** used to hold those values. +** +** INVARIANTS: +** +** {F13761} A successful call to [sqlite3_column_decltype(S,N)] +** returns a zero-terminated UTF-8 string containing the +** the declared datatype of the table column that appears +** as the Nth column (numbered from 0) of the result set to the +** [prepared statement] S. +** +** {F13762} A successful call to [sqlite3_column_decltype16(S,N)] +** returns a zero-terminated UTF-16 native byte order string +** containing the declared datatype of the table column that appears +** as the Nth column (numbered from 0) of the result set to the +** [prepared statement] S. +** +** {F13763} If N is less than 0 or N is greater than or equal to +** the number of columns in [prepared statement] S +** or if the Nth column of S is an expression or subquery rather +** than a table column or if a memory allocation failure +** occurs during encoding conversions, then +** calls to [sqlite3_column_decltype(S,N)] or +** [sqlite3_column_decltype16(S,N)] return NULL. +*/ +const char *sqlite3_column_decltype(sqlite3_stmt*,int); +const void *sqlite3_column_decltype16(sqlite3_stmt*,int); + +/* +** CAPI3REF: Evaluate An SQL Statement {F13200} +** +** After an [prepared statement] has been prepared with a call +** to either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] or to one of +** the legacy interfaces [sqlite3_prepare()] or [sqlite3_prepare16()], +** then this function must be called one or more times to evaluate the +** statement. +** +** The details of the behavior of this sqlite3_step() interface depend +** on whether the statement was prepared using the newer "v2" interface +** [sqlite3_prepare_v2()] and [sqlite3_prepare16_v2()] or the older legacy +** interface [sqlite3_prepare()] and [sqlite3_prepare16()]. The use of the +** new "v2" interface is recommended for new applications but the legacy +** interface will continue to be supported. +** +** In the legacy interface, the return value will be either [SQLITE_BUSY], +** [SQLITE_DONE], [SQLITE_ROW], [SQLITE_ERROR], or [SQLITE_MISUSE]. +** With the "v2" interface, any of the other [SQLITE_OK | result code] +** or [SQLITE_IOERR_READ | extended result code] might be returned as +** well. +** +** [SQLITE_BUSY] means that the database engine was unable to acquire the +** database locks it needs to do its job. If the statement is a COMMIT +** or occurs outside of an explicit transaction, then you can retry the +** statement. If the statement is not a COMMIT and occurs within a +** explicit transaction then you should rollback the transaction before +** continuing. +** +** [SQLITE_DONE] means that the statement has finished executing +** successfully. sqlite3_step() should not be called again on this virtual +** machine without first calling [sqlite3_reset()] to reset the virtual +** machine back to its initial state. +** +** If the SQL statement being executed returns any data, then +** [SQLITE_ROW] is returned each time a new row of data is ready +** for processing by the caller. The values may be accessed using +** the [sqlite3_column_int | column access functions]. +** sqlite3_step() is called again to retrieve the next row of data. +** +** [SQLITE_ERROR] means that a run-time error (such as a constraint +** violation) has occurred. sqlite3_step() should not be called again on +** the VM. More information may be found by calling [sqlite3_errmsg()]. +** With the legacy interface, a more specific error code (example: +** [SQLITE_INTERRUPT], [SQLITE_SCHEMA], [SQLITE_CORRUPT], and so forth) +** can be obtained by calling [sqlite3_reset()] on the +** [prepared statement]. In the "v2" interface, +** the more specific error code is returned directly by sqlite3_step(). +** +** [SQLITE_MISUSE] means that the this routine was called inappropriately. +** Perhaps it was called on a [prepared statement] that has +** already been [sqlite3_finalize | finalized] or on one that had +** previously returned [SQLITE_ERROR] or [SQLITE_DONE]. Or it could +** be the case that the same database connection is being used by two or +** more threads at the same moment in time. +** +** <b>Goofy Interface Alert:</b> +** In the legacy interface, +** the sqlite3_step() API always returns a generic error code, +** [SQLITE_ERROR], following any error other than [SQLITE_BUSY] +** and [SQLITE_MISUSE]. You must call [sqlite3_reset()] or +** [sqlite3_finalize()] in order to find one of the specific +** [error codes] that better describes the error. +** We admit that this is a goofy design. The problem has been fixed +** with the "v2" interface. If you prepare all of your SQL statements +** using either [sqlite3_prepare_v2()] or [sqlite3_prepare16_v2()] instead +** of the legacy [sqlite3_prepare()] and [sqlite3_prepare16()], then the +** more specific [error codes] are returned directly +** by sqlite3_step(). The use of the "v2" interface is recommended. +** +** INVARIANTS: +** +** {F13202} If [prepared statement] S is ready to be +** run, then [sqlite3_step(S)] advances that prepared statement +** until to completion or until it is ready to return another +** row of the result set or an interrupt or run-time error occurs. +** +** {F15304} When a call to [sqlite3_step(S)] causes the +** [prepared statement] S to run to completion, +** the function returns [SQLITE_DONE]. +** +** {F15306} When a call to [sqlite3_step(S)] stops because it is ready +** to return another row of the result set, it returns +** [SQLITE_ROW]. +** +** {F15308} If a call to [sqlite3_step(S)] encounters an +** [sqlite3_interrupt|interrupt] or a run-time error, +** it returns an appropraite error code that is not one of +** [SQLITE_OK], [SQLITE_ROW], or [SQLITE_DONE]. +** +** {F15310} If an [sqlite3_interrupt|interrupt] or run-time error +** occurs during a call to [sqlite3_step(S)] +** for a [prepared statement] S created using +** legacy interfaces [sqlite3_prepare()] or +** [sqlite3_prepare16()] then the function returns either +** [SQLITE_ERROR], [SQLITE_BUSY], or [SQLITE_MISUSE]. +*/ +int sqlite3_step(sqlite3_stmt*); + +/* +** CAPI3REF: Number of columns in a result set {F13770} +** +** Return the number of values in the current row of the result set. +** +** INVARIANTS: +** +** {F13771} After a call to [sqlite3_step(S)] that returns +** [SQLITE_ROW], the [sqlite3_data_count(S)] routine +** will return the same value as the +** [sqlite3_column_count(S)] function. +** +** {F13772} After [sqlite3_step(S)] has returned any value other than +** [SQLITE_ROW] or before [sqlite3_step(S)] has been +** called on the [prepared statement] for +** the first time since it was [sqlite3_prepare|prepared] +** or [sqlite3_reset|reset], the [sqlite3_data_count(S)] +** routine returns zero. +*/ +int sqlite3_data_count(sqlite3_stmt *pStmt); + +/* +** CAPI3REF: Fundamental Datatypes {F10265} +** KEYWORDS: SQLITE_TEXT +** +** {F10266}Every value in SQLite has one of five fundamental datatypes: +** +** <ul> +** <li> 64-bit signed integer +** <li> 64-bit IEEE floating point number +** <li> string +** <li> BLOB +** <li> NULL +** </ul> {END} +** +** These constants are codes for each of those types. +** +** Note that the SQLITE_TEXT constant was also used in SQLite version 2 +** for a completely different meaning. Software that links against both +** SQLite version 2 and SQLite version 3 should use SQLITE3_TEXT not +** SQLITE_TEXT. +*/ +#define SQLITE_INTEGER 1 +#define SQLITE_FLOAT 2 +#define SQLITE_BLOB 4 +#define SQLITE_NULL 5 +#ifdef SQLITE_TEXT +# undef SQLITE_TEXT +#else +# define SQLITE_TEXT 3 +#endif +#define SQLITE3_TEXT 3 + +/* +** CAPI3REF: Results Values From A Query {F13800} +** +** These routines form the "result set query" interface. +** +** These routines return information about +** a single column of the current result row of a query. In every +** case the first argument is a pointer to the +** [prepared statement] that is being +** evaluated (the [sqlite3_stmt*] that was returned from +** [sqlite3_prepare_v2()] or one of its variants) and +** the second argument is the index of the column for which information +** should be returned. The left-most column of the result set +** has an index of 0. +** +** If the SQL statement is not currently point to a valid row, or if the +** the column index is out of range, the result is undefined. +** These routines may only be called when the most recent call to +** [sqlite3_step()] has returned [SQLITE_ROW] and neither +** [sqlite3_reset()] nor [sqlite3_finalize()] has been call subsequently. +** If any of these routines are called after [sqlite3_reset()] or +** [sqlite3_finalize()] or after [sqlite3_step()] has returned +** something other than [SQLITE_ROW], the results are undefined. +** If [sqlite3_step()] or [sqlite3_reset()] or [sqlite3_finalize()] +** are called from a different thread while any of these routines +** are pending, then the results are undefined. +** +** The sqlite3_column_type() routine returns +** [SQLITE_INTEGER | datatype code] for the initial data type +** of the result column. The returned value is one of [SQLITE_INTEGER], +** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL]. The value +** returned by sqlite3_column_type() is only meaningful if no type +** conversions have occurred as described below. After a type conversion, +** the value returned by sqlite3_column_type() is undefined. Future +** versions of SQLite may change the behavior of sqlite3_column_type() +** following a type conversion. +** +** If the result is a BLOB or UTF-8 string then the sqlite3_column_bytes() +** routine returns the number of bytes in that BLOB or string. +** If the result is a UTF-16 string, then sqlite3_column_bytes() converts +** the string to UTF-8 and then returns the number of bytes. +** If the result is a numeric value then sqlite3_column_bytes() uses +** [sqlite3_snprintf()] to convert that value to a UTF-8 string and returns +** the number of bytes in that string. +** The value returned does not include the zero terminator at the end +** of the string. For clarity: the value returned is the number of +** bytes in the string, not the number of characters. +** +** Strings returned by sqlite3_column_text() and sqlite3_column_text16(), +** even empty strings, are always zero terminated. The return +** value from sqlite3_column_blob() for a zero-length blob is an arbitrary +** pointer, possibly even a NULL pointer. +** +** The sqlite3_column_bytes16() routine is similar to sqlite3_column_bytes() +** but leaves the result in UTF-16 in native byte order instead of UTF-8. +** The zero terminator is not included in this count. +** +** The object returned by [sqlite3_column_value()] is an +** [unprotected sqlite3_value] object. An unprotected sqlite3_value object +** may only be used with [sqlite3_bind_value()] and [sqlite3_result_value()]. +** If the [unprotected sqlite3_value] object returned by +** [sqlite3_column_value()] is used in any other way, including calls +** to routines like +** [sqlite3_value_int()], [sqlite3_value_text()], or [sqlite3_value_bytes()], +** then the behavior is undefined. +** +** These routines attempt to convert the value where appropriate. For +** example, if the internal representation is FLOAT and a text result +** is requested, [sqlite3_snprintf()] is used internally to do the conversion +** automatically. The following table details the conversions that +** are applied: +** +** <blockquote> +** <table border="1"> +** <tr><th> Internal<br>Type <th> Requested<br>Type <th> Conversion +** +** <tr><td> NULL <td> INTEGER <td> Result is 0 +** <tr><td> NULL <td> FLOAT <td> Result is 0.0 +** <tr><td> NULL <td> TEXT <td> Result is NULL pointer +** <tr><td> NULL <td> BLOB <td> Result is NULL pointer +** <tr><td> INTEGER <td> FLOAT <td> Convert from integer to float +** <tr><td> INTEGER <td> TEXT <td> ASCII rendering of the integer +** <tr><td> INTEGER <td> BLOB <td> Same as for INTEGER->TEXT +** <tr><td> FLOAT <td> INTEGER <td> Convert from float to integer +** <tr><td> FLOAT <td> TEXT <td> ASCII rendering of the float +** <tr><td> FLOAT <td> BLOB <td> Same as FLOAT->TEXT +** <tr><td> TEXT <td> INTEGER <td> Use atoi() +** <tr><td> TEXT <td> FLOAT <td> Use atof() +** <tr><td> TEXT <td> BLOB <td> No change +** <tr><td> BLOB <td> INTEGER <td> Convert to TEXT then use atoi() +** <tr><td> BLOB <td> FLOAT <td> Convert to TEXT then use atof() +** <tr><td> BLOB <td> TEXT <td> Add a zero terminator if needed +** </table> +** </blockquote> +** +** The table above makes reference to standard C library functions atoi() +** and atof(). SQLite does not really use these functions. It has its +** on equavalent internal routines. The atoi() and atof() names are +** used in the table for brevity and because they are familiar to most +** C programmers. +** +** Note that when type conversions occur, pointers returned by prior +** calls to sqlite3_column_blob(), sqlite3_column_text(), and/or +** sqlite3_column_text16() may be invalidated. +** Type conversions and pointer invalidations might occur +** in the following cases: +** +** <ul> +** <li><p> The initial content is a BLOB and sqlite3_column_text() +** or sqlite3_column_text16() is called. A zero-terminator might +** need to be added to the string.</p></li> +** +** <li><p> The initial content is UTF-8 text and sqlite3_column_bytes16() or +** sqlite3_column_text16() is called. The content must be converted +** to UTF-16.</p></li> +** +** <li><p> The initial content is UTF-16 text and sqlite3_column_bytes() or +** sqlite3_column_text() is called. The content must be converted +** to UTF-8.</p></li> +** </ul> +** +** Conversions between UTF-16be and UTF-16le are always done in place and do +** not invalidate a prior pointer, though of course the content of the buffer +** that the prior pointer points to will have been modified. Other kinds +** of conversion are done in place when it is possible, but sometime it is +** not possible and in those cases prior pointers are invalidated. +** +** The safest and easiest to remember policy is to invoke these routines +** in one of the following ways: +** +** <ul> +** <li>sqlite3_column_text() followed by sqlite3_column_bytes()</li> +** <li>sqlite3_column_blob() followed by sqlite3_column_bytes()</li> +** <li>sqlite3_column_text16() followed by sqlite3_column_bytes16()</li> +** </ul> +** +** In other words, you should call sqlite3_column_text(), sqlite3_column_blob(), +** or sqlite3_column_text16() first to force the result into the desired +** format, then invoke sqlite3_column_bytes() or sqlite3_column_bytes16() to +** find the size of the result. Do not mix call to sqlite3_column_text() or +** sqlite3_column_blob() with calls to sqlite3_column_bytes16(). And do not +** mix calls to sqlite3_column_text16() with calls to sqlite3_column_bytes(). +** +** The pointers returned are valid until a type conversion occurs as +** described above, or until [sqlite3_step()] or [sqlite3_reset()] or +** [sqlite3_finalize()] is called. The memory space used to hold strings +** and blobs is freed automatically. Do <b>not</b> pass the pointers returned +** [sqlite3_column_blob()], [sqlite3_column_text()], etc. into +** [sqlite3_free()]. +** +** If a memory allocation error occurs during the evaluation of any +** of these routines, a default value is returned. The default value +** is either the integer 0, the floating point number 0.0, or a NULL +** pointer. Subsequent calls to [sqlite3_errcode()] will return +** [SQLITE_NOMEM]. +** +** INVARIANTS: +** +** {F13803} The [sqlite3_column_blob(S,N)] interface converts the +** Nth column in the current row of the result set for +** [prepared statement] S into a blob and then returns a +** pointer to the converted value. +** +** {F13806} The [sqlite3_column_bytes(S,N)] interface returns the +** number of bytes in the blob or string (exclusive of the +** zero terminator on the string) that was returned by the +** most recent call to [sqlite3_column_blob(S,N)] or +** [sqlite3_column_text(S,N)]. +** +** {F13809} The [sqlite3_column_bytes16(S,N)] interface returns the +** number of bytes in the string (exclusive of the +** zero terminator on the string) that was returned by the +** most recent call to [sqlite3_column_text16(S,N)]. +** +** {F13812} The [sqlite3_column_double(S,N)] interface converts the +** Nth column in the current row of the result set for +** [prepared statement] S into a floating point value and +** returns a copy of that value. +** +** {F13815} The [sqlite3_column_int(S,N)] interface converts the +** Nth column in the current row of the result set for +** [prepared statement] S into a 64-bit signed integer and +** returns the lower 32 bits of that integer. +** +** {F13818} The [sqlite3_column_int64(S,N)] interface converts the +** Nth column in the current row of the result set for +** [prepared statement] S into a 64-bit signed integer and +** returns a copy of that integer. +** +** {F13821} The [sqlite3_column_text(S,N)] interface converts the +** Nth column in the current row of the result set for +** [prepared statement] S into a zero-terminated UTF-8 +** string and returns a pointer to that string. +** +** {F13824} The [sqlite3_column_text16(S,N)] interface converts the +** Nth column in the current row of the result set for +** [prepared statement] S into a zero-terminated 2-byte +** aligned UTF-16 native byte order +** string and returns a pointer to that string. +** +** {F13827} The [sqlite3_column_type(S,N)] interface returns +** one of [SQLITE_NULL], [SQLITE_INTEGER], [SQLITE_FLOAT], +** [SQLITE_TEXT], or [SQLITE_BLOB] as appropriate for +** the Nth column in the current row of the result set for +** [prepared statement] S. +** +** {F13830} The [sqlite3_column_value(S,N)] interface returns a +** pointer to an [unprotected sqlite3_value] object for the +** Nth column in the current row of the result set for +** [prepared statement] S. +*/ +const void *sqlite3_column_blob(sqlite3_stmt*, int iCol); +int sqlite3_column_bytes(sqlite3_stmt*, int iCol); +int sqlite3_column_bytes16(sqlite3_stmt*, int iCol); +double sqlite3_column_double(sqlite3_stmt*, int iCol); +int sqlite3_column_int(sqlite3_stmt*, int iCol); +sqlite3_int64 sqlite3_column_int64(sqlite3_stmt*, int iCol); +const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol); +const void *sqlite3_column_text16(sqlite3_stmt*, int iCol); +int sqlite3_column_type(sqlite3_stmt*, int iCol); +sqlite3_value *sqlite3_column_value(sqlite3_stmt*, int iCol); + +/* +** CAPI3REF: Destroy A Prepared Statement Object {F13300} +** +** The sqlite3_finalize() function is called to delete a +** [prepared statement]. If the statement was +** executed successfully, or not executed at all, then SQLITE_OK is returned. +** If execution of the statement failed then an +** [error code] or [extended error code] +** is returned. +** +** This routine can be called at any point during the execution of the +** [prepared statement]. If the virtual machine has not +** completed execution when this routine is called, that is like +** encountering an error or an interrupt. (See [sqlite3_interrupt()].) +** Incomplete updates may be rolled back and transactions cancelled, +** depending on the circumstances, and the +** [error code] returned will be [SQLITE_ABORT]. +** +** INVARIANTS: +** +** {F11302} The [sqlite3_finalize(S)] interface destroys the +** [prepared statement] S and releases all +** memory and file resources held by that object. +** +** {F11304} If the most recent call to [sqlite3_step(S)] for the +** [prepared statement] S returned an error, +** then [sqlite3_finalize(S)] returns that same error. +*/ +int sqlite3_finalize(sqlite3_stmt *pStmt); + +/* +** CAPI3REF: Reset A Prepared Statement Object {F13330} +** +** The sqlite3_reset() function is called to reset a +** [prepared statement] object. +** back to its initial state, ready to be re-executed. +** Any SQL statement variables that had values bound to them using +** the [sqlite3_bind_blob | sqlite3_bind_*() API] retain their values. +** Use [sqlite3_clear_bindings()] to reset the bindings. +** +** {F11332} The [sqlite3_reset(S)] interface resets the [prepared statement] S +** back to the beginning of its program. +** +** {F11334} If the most recent call to [sqlite3_step(S)] for +** [prepared statement] S returned [SQLITE_ROW] or [SQLITE_DONE], +** or if [sqlite3_step(S)] has never before been called on S, +** then [sqlite3_reset(S)] returns [SQLITE_OK]. +** +** {F11336} If the most recent call to [sqlite3_step(S)] for +** [prepared statement] S indicated an error, then +** [sqlite3_reset(S)] returns an appropriate [error code]. +** +** {F11338} The [sqlite3_reset(S)] interface does not change the values +** of any [sqlite3_bind_blob|bindings] on [prepared statement] S. +*/ +int sqlite3_reset(sqlite3_stmt *pStmt); + +/* +** CAPI3REF: Create Or Redefine SQL Functions {F16100} +** KEYWORDS: {function creation routines} +** +** These two functions (collectively known as +** "function creation routines") are used to add SQL functions or aggregates +** or to redefine the behavior of existing SQL functions or aggregates. The +** difference only between the two is that the second parameter, the +** name of the (scalar) function or aggregate, is encoded in UTF-8 for +** sqlite3_create_function() and UTF-16 for sqlite3_create_function16(). +** +** The first parameter is the [database connection] to which the SQL +** function is to be added. If a single +** program uses more than one [database connection] internally, then SQL +** functions must be added individually to each [database connection]. +** +** The second parameter is the name of the SQL function to be created +** or redefined. +** The length of the name is limited to 255 bytes, exclusive of the +** zero-terminator. Note that the name length limit is in bytes, not +** characters. Any attempt to create a function with a longer name +** will result in an SQLITE_ERROR error. +** +** The third parameter is the number of arguments that the SQL function or +** aggregate takes. If this parameter is negative, then the SQL function or +** aggregate may take any number of arguments. +** +** The fourth parameter, eTextRep, specifies what +** [SQLITE_UTF8 | text encoding] this SQL function prefers for +** its parameters. Any SQL function implementation should be able to work +** work with UTF-8, UTF-16le, or UTF-16be. But some implementations may be +** more efficient with one encoding than another. It is allowed to +** invoke sqlite3_create_function() or sqlite3_create_function16() multiple +** times with the same function but with different values of eTextRep. +** When multiple implementations of the same function are available, SQLite +** will pick the one that involves the least amount of data conversion. +** If there is only a single implementation which does not care what +** text encoding is used, then the fourth argument should be +** [SQLITE_ANY]. +** +** The fifth parameter is an arbitrary pointer. The implementation +** of the function can gain access to this pointer using +** [sqlite3_user_data()]. +** +** The seventh, eighth and ninth parameters, xFunc, xStep and xFinal, are +** pointers to C-language functions that implement the SQL +** function or aggregate. A scalar SQL function requires an implementation of +** the xFunc callback only, NULL pointers should be passed as the xStep +** and xFinal parameters. An aggregate SQL function requires an implementation +** of xStep and xFinal and NULL should be passed for xFunc. To delete an +** existing SQL function or aggregate, pass NULL for all three function +** callback. +** +** It is permitted to register multiple implementations of the same +** functions with the same name but with either differing numbers of +** arguments or differing perferred text encodings. SQLite will use +** the implementation most closely matches the way in which the +** SQL function is used. +** +** INVARIANTS: +** +** {F16103} The [sqlite3_create_function16()] interface behaves exactly +** like [sqlite3_create_function()] in every way except that it +** interprets the zFunctionName argument as +** zero-terminated UTF-16 native byte order instead of as a +** zero-terminated UTF-8. +** +** {F16106} A successful invocation of +** the [sqlite3_create_function(D,X,N,E,...)] interface registers +** or replaces callback functions in [database connection] D +** used to implement the SQL function named X with N parameters +** and having a perferred text encoding of E. +** +** {F16109} A successful call to [sqlite3_create_function(D,X,N,E,P,F,S,L)] +** replaces the P, F, S, and L values from any prior calls with +** the same D, X, N, and E values. +** +** {F16112} The [sqlite3_create_function(D,X,...)] interface fails with +** a return code of [SQLITE_ERROR] if the SQL function name X is +** longer than 255 bytes exclusive of the zero terminator. +** +** {F16118} Either F must be NULL and S and L are non-NULL or else F +** is non-NULL and S and L are NULL, otherwise +** [sqlite3_create_function(D,X,N,E,P,F,S,L)] returns [SQLITE_ERROR]. +** +** {F16121} The [sqlite3_create_function(D,...)] interface fails with an +** error code of [SQLITE_BUSY] if there exist [prepared statements] +** associated with the [database connection] D. +** +** {F16124} The [sqlite3_create_function(D,X,N,...)] interface fails with an +** error code of [SQLITE_ERROR] if parameter N (specifying the number +** of arguments to the SQL function being registered) is less +** than -1 or greater than 127. +** +** {F16127} When N is non-negative, the [sqlite3_create_function(D,X,N,...)] +** interface causes callbacks to be invoked for the SQL function +** named X when the number of arguments to the SQL function is +** exactly N. +** +** {F16130} When N is -1, the [sqlite3_create_function(D,X,N,...)] +** interface causes callbacks to be invoked for the SQL function +** named X with any number of arguments. +** +** {F16133} When calls to [sqlite3_create_function(D,X,N,...)] +** specify multiple implementations of the same function X +** and when one implementation has N>=0 and the other has N=(-1) +** the implementation with a non-zero N is preferred. +** +** {F16136} When calls to [sqlite3_create_function(D,X,N,E,...)] +** specify multiple implementations of the same function X with +** the same number of arguments N but with different +** encodings E, then the implementation where E matches the +** database encoding is preferred. +** +** {F16139} For an aggregate SQL function created using +** [sqlite3_create_function(D,X,N,E,P,0,S,L)] the finializer +** function L will always be invoked exactly once if the +** step function S is called one or more times. +** +** {F16142} When SQLite invokes either the xFunc or xStep function of +** an application-defined SQL function or aggregate created +** by [sqlite3_create_function()] or [sqlite3_create_function16()], +** then the array of [sqlite3_value] objects passed as the +** third parameter are always [protected sqlite3_value] objects. +*/ +int sqlite3_create_function( + sqlite3 *db, + const char *zFunctionName, + int nArg, + int eTextRep, + void *pApp, + void (*xFunc)(sqlite3_context*,int,sqlite3_value**), + void (*xStep)(sqlite3_context*,int,sqlite3_value**), + void (*xFinal)(sqlite3_context*) +); +int sqlite3_create_function16( + sqlite3 *db, + const void *zFunctionName, + int nArg, + int eTextRep, + void *pApp, + void (*xFunc)(sqlite3_context*,int,sqlite3_value**), + void (*xStep)(sqlite3_context*,int,sqlite3_value**), + void (*xFinal)(sqlite3_context*) +); + +/* +** CAPI3REF: Text Encodings {F10267} +** +** These constant define integer codes that represent the various +** text encodings supported by SQLite. +*/ +#define SQLITE_UTF8 1 +#define SQLITE_UTF16LE 2 +#define SQLITE_UTF16BE 3 +#define SQLITE_UTF16 4 /* Use native byte order */ +#define SQLITE_ANY 5 /* sqlite3_create_function only */ +#define SQLITE_UTF16_ALIGNED 8 /* sqlite3_create_collation only */ + +/* +** CAPI3REF: Obsolete Functions +** +** These functions are all now obsolete. In order to maintain +** backwards compatibility with older code, we continue to support +** these functions. However, new development projects should avoid +** the use of these functions. To help encourage people to avoid +** using these functions, we are not going to tell you want they do. +*/ +int sqlite3_aggregate_count(sqlite3_context*); +int sqlite3_expired(sqlite3_stmt*); +int sqlite3_transfer_bindings(sqlite3_stmt*, sqlite3_stmt*); +int sqlite3_global_recover(void); +void sqlite3_thread_cleanup(void); +int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),void*,sqlite3_int64); + +/* +** CAPI3REF: Obtaining SQL Function Parameter Values {F15100} +** +** The C-language implementation of SQL functions and aggregates uses +** this set of interface routines to access the parameter values on +** the function or aggregate. +** +** The xFunc (for scalar functions) or xStep (for aggregates) parameters +** to [sqlite3_create_function()] and [sqlite3_create_function16()] +** define callbacks that implement the SQL functions and aggregates. +** The 4th parameter to these callbacks is an array of pointers to +** [protected sqlite3_value] objects. There is one [sqlite3_value] object for +** each parameter to the SQL function. These routines are used to +** extract values from the [sqlite3_value] objects. +** +** These routines work only with [protected sqlite3_value] objects. +** Any attempt to use these routines on an [unprotected sqlite3_value] +** object results in undefined behavior. +** +** These routines work just like the corresponding +** [sqlite3_column_blob | sqlite3_column_* routines] except that +** these routines take a single [protected sqlite3_value] object pointer +** instead of an [sqlite3_stmt*] pointer and an integer column number. +** +** The sqlite3_value_text16() interface extracts a UTF16 string +** in the native byte-order of the host machine. The +** sqlite3_value_text16be() and sqlite3_value_text16le() interfaces +** extract UTF16 strings as big-endian and little-endian respectively. +** +** The sqlite3_value_numeric_type() interface attempts to apply +** numeric affinity to the value. This means that an attempt is +** made to convert the value to an integer or floating point. If +** such a conversion is possible without loss of information (in other +** words if the value is a string that looks like a number) +** then the conversion is done. Otherwise no conversion occurs. The +** [SQLITE_INTEGER | datatype] after conversion is returned. +** +** Please pay particular attention to the fact that the pointer that +** is returned from [sqlite3_value_blob()], [sqlite3_value_text()], or +** [sqlite3_value_text16()] can be invalidated by a subsequent call to +** [sqlite3_value_bytes()], [sqlite3_value_bytes16()], [sqlite3_value_text()], +** or [sqlite3_value_text16()]. +** +** These routines must be called from the same thread as +** the SQL function that supplied the [sqlite3_value*] parameters. +** +** +** INVARIANTS: +** +** {F15103} The [sqlite3_value_blob(V)] interface converts the +** [protected sqlite3_value] object V into a blob and then returns a +** pointer to the converted value. +** +** {F15106} The [sqlite3_value_bytes(V)] interface returns the +** number of bytes in the blob or string (exclusive of the +** zero terminator on the string) that was returned by the +** most recent call to [sqlite3_value_blob(V)] or +** [sqlite3_value_text(V)]. +** +** {F15109} The [sqlite3_value_bytes16(V)] interface returns the +** number of bytes in the string (exclusive of the +** zero terminator on the string) that was returned by the +** most recent call to [sqlite3_value_text16(V)], +** [sqlite3_value_text16be(V)], or [sqlite3_value_text16le(V)]. +** +** {F15112} The [sqlite3_value_double(V)] interface converts the +** [protected sqlite3_value] object V into a floating point value and +** returns a copy of that value. +** +** {F15115} The [sqlite3_value_int(V)] interface converts the +** [protected sqlite3_value] object V into a 64-bit signed integer and +** returns the lower 32 bits of that integer. +** +** {F15118} The [sqlite3_value_int64(V)] interface converts the +** [protected sqlite3_value] object V into a 64-bit signed integer and +** returns a copy of that integer. +** +** {F15121} The [sqlite3_value_text(V)] interface converts the +** [protected sqlite3_value] object V into a zero-terminated UTF-8 +** string and returns a pointer to that string. +** +** {F15124} The [sqlite3_value_text16(V)] interface converts the +** [protected sqlite3_value] object V into a zero-terminated 2-byte +** aligned UTF-16 native byte order +** string and returns a pointer to that string. +** +** {F15127} The [sqlite3_value_text16be(V)] interface converts the +** [protected sqlite3_value] object V into a zero-terminated 2-byte +** aligned UTF-16 big-endian +** string and returns a pointer to that string. +** +** {F15130} The [sqlite3_value_text16le(V)] interface converts the +** [protected sqlite3_value] object V into a zero-terminated 2-byte +** aligned UTF-16 little-endian +** string and returns a pointer to that string. +** +** {F15133} The [sqlite3_value_type(V)] interface returns +** one of [SQLITE_NULL], [SQLITE_INTEGER], [SQLITE_FLOAT], +** [SQLITE_TEXT], or [SQLITE_BLOB] as appropriate for +** the [sqlite3_value] object V. +** +** {F15136} The [sqlite3_value_numeric_type(V)] interface converts +** the [protected sqlite3_value] object V into either an integer or +** a floating point value if it can do so without loss of +** information, and returns one of [SQLITE_NULL], +** [SQLITE_INTEGER], [SQLITE_FLOAT], [SQLITE_TEXT], or +** [SQLITE_BLOB] as appropriate for +** the [protected sqlite3_value] object V after the conversion attempt. +*/ +const void *sqlite3_value_blob(sqlite3_value*); +int sqlite3_value_bytes(sqlite3_value*); +int sqlite3_value_bytes16(sqlite3_value*); +double sqlite3_value_double(sqlite3_value*); +int sqlite3_value_int(sqlite3_value*); +sqlite3_int64 sqlite3_value_int64(sqlite3_value*); +const unsigned char *sqlite3_value_text(sqlite3_value*); +const void *sqlite3_value_text16(sqlite3_value*); +const void *sqlite3_value_text16le(sqlite3_value*); +const void *sqlite3_value_text16be(sqlite3_value*); +int sqlite3_value_type(sqlite3_value*); +int sqlite3_value_numeric_type(sqlite3_value*); + +/* +** CAPI3REF: Obtain Aggregate Function Context {F16210} +** +** The implementation of aggregate SQL functions use this routine to allocate +** a structure for storing their state. +** The first time the sqlite3_aggregate_context() routine is +** is called for a particular aggregate, SQLite allocates nBytes of memory +** zeros that memory, and returns a pointer to it. +** On second and subsequent calls to sqlite3_aggregate_context() +** for the same aggregate function index, the same buffer is returned. +** The implementation +** of the aggregate can use the returned buffer to accumulate data. +** +** SQLite automatically frees the allocated buffer when the aggregate +** query concludes. +** +** The first parameter should be a copy of the +** [sqlite3_context | SQL function context] that is the first +** parameter to the callback routine that implements the aggregate +** function. +** +** This routine must be called from the same thread in which +** the aggregate SQL function is running. +** +** INVARIANTS: +** +** {F16211} The first invocation of [sqlite3_aggregate_context(C,N)] for +** a particular instance of an aggregate function (for a particular +** context C) causes SQLite to allocation N bytes of memory, +** zero that memory, and return a pointer to the allocationed +** memory. +** +** {F16213} If a memory allocation error occurs during +** [sqlite3_aggregate_context(C,N)] then the function returns 0. +** +** {F16215} Second and subsequent invocations of +** [sqlite3_aggregate_context(C,N)] for the same context pointer C +** ignore the N parameter and return a pointer to the same +** block of memory returned by the first invocation. +** +** {F16217} The memory allocated by [sqlite3_aggregate_context(C,N)] is +** automatically freed on the next call to [sqlite3_reset()] +** or [sqlite3_finalize()] for the [prepared statement] containing +** the aggregate function associated with context C. +*/ +void *sqlite3_aggregate_context(sqlite3_context*, int nBytes); + +/* +** CAPI3REF: User Data For Functions {F16240} +** +** The sqlite3_user_data() interface returns a copy of +** the pointer that was the pUserData parameter (the 5th parameter) +** of the the [sqlite3_create_function()] +** and [sqlite3_create_function16()] routines that originally +** registered the application defined function. {END} +** +** This routine must be called from the same thread in which +** the application-defined function is running. +** +** INVARIANTS: +** +** {F16243} The [sqlite3_user_data(C)] interface returns a copy of the +** P pointer from the [sqlite3_create_function(D,X,N,E,P,F,S,L)] +** or [sqlite3_create_function16(D,X,N,E,P,F,S,L)] call that +** registered the SQL function associated with +** [sqlite3_context] C. +*/ +void *sqlite3_user_data(sqlite3_context*); + +/* +** CAPI3REF: Database Connection For Functions {F16250} +** +** The sqlite3_context_db_handle() interface returns a copy of +** the pointer to the [database connection] (the 1st parameter) +** of the the [sqlite3_create_function()] +** and [sqlite3_create_function16()] routines that originally +** registered the application defined function. +** +** INVARIANTS: +** +** {F16253} The [sqlite3_context_db_handle(C)] interface returns a copy of the +** D pointer from the [sqlite3_create_function(D,X,N,E,P,F,S,L)] +** or [sqlite3_create_function16(D,X,N,E,P,F,S,L)] call that +** registered the SQL function associated with +** [sqlite3_context] C. +*/ +sqlite3 *sqlite3_context_db_handle(sqlite3_context*); + +/* +** CAPI3REF: Function Auxiliary Data {F16270} +** +** The following two functions may be used by scalar SQL functions to +** associate meta-data with argument values. If the same value is passed to +** multiple invocations of the same SQL function during query execution, under +** some circumstances the associated meta-data may be preserved. This may +** be used, for example, to add a regular-expression matching scalar +** function. The compiled version of the regular expression is stored as +** meta-data associated with the SQL value passed as the regular expression +** pattern. The compiled regular expression can be reused on multiple +** invocations of the same function so that the original pattern string +** does not need to be recompiled on each invocation. +** +** The sqlite3_get_auxdata() interface returns a pointer to the meta-data +** associated by the sqlite3_set_auxdata() function with the Nth argument +** value to the application-defined function. +** If no meta-data has been ever been set for the Nth +** argument of the function, or if the cooresponding function parameter +** has changed since the meta-data was set, then sqlite3_get_auxdata() +** returns a NULL pointer. +** +** The sqlite3_set_auxdata() interface saves the meta-data +** pointed to by its 3rd parameter as the meta-data for the N-th +** argument of the application-defined function. Subsequent +** calls to sqlite3_get_auxdata() might return this data, if it has +** not been destroyed. +** If it is not NULL, SQLite will invoke the destructor +** function given by the 4th parameter to sqlite3_set_auxdata() on +** the meta-data when the corresponding function parameter changes +** or when the SQL statement completes, whichever comes first. +** +** SQLite is free to call the destructor and drop meta-data on +** any parameter of any function at any time. The only guarantee +** is that the destructor will be called before the metadata is +** dropped. +** +** In practice, meta-data is preserved between function calls for +** expressions that are constant at compile time. This includes literal +** values and SQL variables. +** +** These routines must be called from the same thread in which +** the SQL function is running. +** +** INVARIANTS: +** +** {F16272} The [sqlite3_get_auxdata(C,N)] interface returns a pointer +** to metadata associated with the Nth parameter of the SQL function +** whose context is C, or NULL if there is no metadata associated +** with that parameter. +** +** {F16274} The [sqlite3_set_auxdata(C,N,P,D)] interface assigns a metadata +** pointer P to the Nth parameter of the SQL function with context +** C. +** +** {F16276} SQLite will invoke the destructor D with a single argument +** which is the metadata pointer P following a call to +** [sqlite3_set_auxdata(C,N,P,D)] when SQLite ceases to hold +** the metadata. +** +** {F16277} SQLite ceases to hold metadata for an SQL function parameter +** when the value of that parameter changes. +** +** {F16278} When [sqlite3_set_auxdata(C,N,P,D)] is invoked, the destructor +** is called for any prior metadata associated with the same function +** context C and parameter N. +** +** {F16279} SQLite will call destructors for any metadata it is holding +** in a particular [prepared statement] S when either +** [sqlite3_reset(S)] or [sqlite3_finalize(S)] is called. +*/ +void *sqlite3_get_auxdata(sqlite3_context*, int N); +void sqlite3_set_auxdata(sqlite3_context*, int N, void*, void (*)(void*)); + + +/* +** CAPI3REF: Constants Defining Special Destructor Behavior {F10280} +** +** These are special value for the destructor that is passed in as the +** final argument to routines like [sqlite3_result_blob()]. If the destructor +** argument is SQLITE_STATIC, it means that the content pointer is constant +** and will never change. It does not need to be destroyed. The +** SQLITE_TRANSIENT value means that the content will likely change in +** the near future and that SQLite should make its own private copy of +** the content before returning. +** +** The typedef is necessary to work around problems in certain +** C++ compilers. See ticket #2191. +*/ +typedef void (*sqlite3_destructor_type)(void*); +#define SQLITE_STATIC ((sqlite3_destructor_type)0) +#define SQLITE_TRANSIENT ((sqlite3_destructor_type)-1) + +/* +** CAPI3REF: Setting The Result Of An SQL Function {F16400} +** +** These routines are used by the xFunc or xFinal callbacks that +** implement SQL functions and aggregates. See +** [sqlite3_create_function()] and [sqlite3_create_function16()] +** for additional information. +** +** These functions work very much like the +** [sqlite3_bind_blob | sqlite3_bind_*] family of functions used +** to bind values to host parameters in prepared statements. +** Refer to the +** [sqlite3_bind_blob | sqlite3_bind_* documentation] for +** additional information. +** +** The sqlite3_result_blob() interface sets the result from +** an application defined function to be the BLOB whose content is pointed +** to by the second parameter and which is N bytes long where N is the +** third parameter. +** The sqlite3_result_zeroblob() inerfaces set the result of +** the application defined function to be a BLOB containing all zero +** bytes and N bytes in size, where N is the value of the 2nd parameter. +** +** The sqlite3_result_double() interface sets the result from +** an application defined function to be a floating point value specified +** by its 2nd argument. +** +** The sqlite3_result_error() and sqlite3_result_error16() functions +** cause the implemented SQL function to throw an exception. +** SQLite uses the string pointed to by the +** 2nd parameter of sqlite3_result_error() or sqlite3_result_error16() +** as the text of an error message. SQLite interprets the error +** message string from sqlite3_result_error() as UTF8. SQLite +** interprets the string from sqlite3_result_error16() as UTF16 in native +** byte order. If the third parameter to sqlite3_result_error() +** or sqlite3_result_error16() is negative then SQLite takes as the error +** message all text up through the first zero character. +** If the third parameter to sqlite3_result_error() or +** sqlite3_result_error16() is non-negative then SQLite takes that many +** bytes (not characters) from the 2nd parameter as the error message. +** The sqlite3_result_error() and sqlite3_result_error16() +** routines make a copy private copy of the error message text before +** they return. Hence, the calling function can deallocate or +** modify the text after they return without harm. +** The sqlite3_result_error_code() function changes the error code +** returned by SQLite as a result of an error in a function. By default, +** the error code is SQLITE_ERROR. A subsequent call to sqlite3_result_error() +** or sqlite3_result_error16() resets the error code to SQLITE_ERROR. +** +** The sqlite3_result_toobig() interface causes SQLite +** to throw an error indicating that a string or BLOB is to long +** to represent. The sqlite3_result_nomem() interface +** causes SQLite to throw an exception indicating that the a +** memory allocation failed. +** +** The sqlite3_result_int() interface sets the return value +** of the application-defined function to be the 32-bit signed integer +** value given in the 2nd argument. +** The sqlite3_result_int64() interface sets the return value +** of the application-defined function to be the 64-bit signed integer +** value given in the 2nd argument. +** +** The sqlite3_result_null() interface sets the return value +** of the application-defined function to be NULL. +** +** The sqlite3_result_text(), sqlite3_result_text16(), +** sqlite3_result_text16le(), and sqlite3_result_text16be() interfaces +** set the return value of the application-defined function to be +** a text string which is represented as UTF-8, UTF-16 native byte order, +** UTF-16 little endian, or UTF-16 big endian, respectively. +** SQLite takes the text result from the application from +** the 2nd parameter of the sqlite3_result_text* interfaces. +** If the 3rd parameter to the sqlite3_result_text* interfaces +** is negative, then SQLite takes result text from the 2nd parameter +** through the first zero character. +** If the 3rd parameter to the sqlite3_result_text* interfaces +** is non-negative, then as many bytes (not characters) of the text +** pointed to by the 2nd parameter are taken as the application-defined +** function result. +** If the 4th parameter to the sqlite3_result_text* interfaces +** or sqlite3_result_blob is a non-NULL pointer, then SQLite calls that +** function as the destructor on the text or blob result when it has +** finished using that result. +** If the 4th parameter to the sqlite3_result_text* interfaces +** or sqlite3_result_blob is the special constant SQLITE_STATIC, then +** SQLite assumes that the text or blob result is constant space and +** does not copy the space or call a destructor when it has +** finished using that result. +** If the 4th parameter to the sqlite3_result_text* interfaces +** or sqlite3_result_blob is the special constant SQLITE_TRANSIENT +** then SQLite makes a copy of the result into space obtained from +** from [sqlite3_malloc()] before it returns. +** +** The sqlite3_result_value() interface sets the result of +** the application-defined function to be a copy the +** [unprotected sqlite3_value] object specified by the 2nd parameter. The +** sqlite3_result_value() interface makes a copy of the [sqlite3_value] +** so that [sqlite3_value] specified in the parameter may change or +** be deallocated after sqlite3_result_value() returns without harm. +** A [protected sqlite3_value] object may always be used where an +** [unprotected sqlite3_value] object is required, so either +** kind of [sqlite3_value] object can be used with this interface. +** +** If these routines are called from within the different thread +** than the one containing the application-defined function that recieved +** the [sqlite3_context] pointer, the results are undefined. +** +** INVARIANTS: +** +** {F16403} The default return value from any SQL function is NULL. +** +** {F16406} The [sqlite3_result_blob(C,V,N,D)] interface changes the +** return value of function C to be a blob that is N bytes +** in length and with content pointed to by V. +** +** {F16409} The [sqlite3_result_double(C,V)] interface changes the +** return value of function C to be the floating point value V. +** +** {F16412} The [sqlite3_result_error(C,V,N)] interface changes the return +** value of function C to be an exception with error code +** [SQLITE_ERROR] and a UTF8 error message copied from V up to the +** first zero byte or until N bytes are read if N is positive. +** +** {F16415} The [sqlite3_result_error16(C,V,N)] interface changes the return +** value of function C to be an exception with error code +** [SQLITE_ERROR] and a UTF16 native byte order error message +** copied from V up to the first zero terminator or until N bytes +** are read if N is positive. +** +** {F16418} The [sqlite3_result_error_toobig(C)] interface changes the return +** value of the function C to be an exception with error code +** [SQLITE_TOOBIG] and an appropriate error message. +** +** {F16421} The [sqlite3_result_error_nomem(C)] interface changes the return +** value of the function C to be an exception with error code +** [SQLITE_NOMEM] and an appropriate error message. +** +** {F16424} The [sqlite3_result_error_code(C,E)] interface changes the return +** value of the function C to be an exception with error code E. +** The error message text is unchanged. +** +** {F16427} The [sqlite3_result_int(C,V)] interface changes the +** return value of function C to be the 32-bit integer value V. +** +** {F16430} The [sqlite3_result_int64(C,V)] interface changes the +** return value of function C to be the 64-bit integer value V. +** +** {F16433} The [sqlite3_result_null(C)] interface changes the +** return value of function C to be NULL. +** +** {F16436} The [sqlite3_result_text(C,V,N,D)] interface changes the +** return value of function C to be the UTF8 string +** V up to the first zero if N is negative +** or the first N bytes of V if N is non-negative. +** +** {F16439} The [sqlite3_result_text16(C,V,N,D)] interface changes the +** return value of function C to be the UTF16 native byte order +** string V up to the first zero if N is +** negative or the first N bytes of V if N is non-negative. +** +** {F16442} The [sqlite3_result_text16be(C,V,N,D)] interface changes the +** return value of function C to be the UTF16 big-endian +** string V up to the first zero if N is +** is negative or the first N bytes or V if N is non-negative. +** +** {F16445} The [sqlite3_result_text16le(C,V,N,D)] interface changes the +** return value of function C to be the UTF16 little-endian +** string V up to the first zero if N is +** negative or the first N bytes of V if N is non-negative. +** +** {F16448} The [sqlite3_result_value(C,V)] interface changes the +** return value of function C to be [unprotected sqlite3_value] +** object V. +** +** {F16451} The [sqlite3_result_zeroblob(C,N)] interface changes the +** return value of function C to be an N-byte blob of all zeros. +** +** {F16454} The [sqlite3_result_error()] and [sqlite3_result_error16()] +** interfaces make a copy of their error message strings before +** returning. +** +** {F16457} If the D destructor parameter to [sqlite3_result_blob(C,V,N,D)], +** [sqlite3_result_text(C,V,N,D)], [sqlite3_result_text16(C,V,N,D)], +** [sqlite3_result_text16be(C,V,N,D)], or +** [sqlite3_result_text16le(C,V,N,D)] is the constant [SQLITE_STATIC] +** then no destructor is ever called on the pointer V and SQLite +** assumes that V is immutable. +** +** {F16460} If the D destructor parameter to [sqlite3_result_blob(C,V,N,D)], +** [sqlite3_result_text(C,V,N,D)], [sqlite3_result_text16(C,V,N,D)], +** [sqlite3_result_text16be(C,V,N,D)], or +** [sqlite3_result_text16le(C,V,N,D)] is the constant +** [SQLITE_TRANSIENT] then the interfaces makes a copy of the +** content of V and retains the copy. +** +** {F16463} If the D destructor parameter to [sqlite3_result_blob(C,V,N,D)], +** [sqlite3_result_text(C,V,N,D)], [sqlite3_result_text16(C,V,N,D)], +** [sqlite3_result_text16be(C,V,N,D)], or +** [sqlite3_result_text16le(C,V,N,D)] is some value other than +** the constants [SQLITE_STATIC] and [SQLITE_TRANSIENT] then +** SQLite will invoke the destructor D with V as its only argument +** when it has finished with the V value. +*/ +void sqlite3_result_blob(sqlite3_context*, const void*, int, void(*)(void*)); +void sqlite3_result_double(sqlite3_context*, double); +void sqlite3_result_error(sqlite3_context*, const char*, int); +void sqlite3_result_error16(sqlite3_context*, const void*, int); +void sqlite3_result_error_toobig(sqlite3_context*); +void sqlite3_result_error_nomem(sqlite3_context*); +void sqlite3_result_error_code(sqlite3_context*, int); +void sqlite3_result_int(sqlite3_context*, int); +void sqlite3_result_int64(sqlite3_context*, sqlite3_int64); +void sqlite3_result_null(sqlite3_context*); +void sqlite3_result_text(sqlite3_context*, const char*, int, void(*)(void*)); +void sqlite3_result_text16(sqlite3_context*, const void*, int, void(*)(void*)); +void sqlite3_result_text16le(sqlite3_context*, const void*, int,void(*)(void*)); +void sqlite3_result_text16be(sqlite3_context*, const void*, int,void(*)(void*)); +void sqlite3_result_value(sqlite3_context*, sqlite3_value*); +void sqlite3_result_zeroblob(sqlite3_context*, int n); + +/* +** CAPI3REF: Define New Collating Sequences {F16600} +** +** These functions are used to add new collation sequences to the +** [sqlite3*] handle specified as the first argument. +** +** The name of the new collation sequence is specified as a UTF-8 string +** for sqlite3_create_collation() and sqlite3_create_collation_v2() +** and a UTF-16 string for sqlite3_create_collation16(). In all cases +** the name is passed as the second function argument. +** +** The third argument may be one of the constants [SQLITE_UTF8], +** [SQLITE_UTF16LE] or [SQLITE_UTF16BE], indicating that the user-supplied +** routine expects to be passed pointers to strings encoded using UTF-8, +** UTF-16 little-endian or UTF-16 big-endian respectively. The +** third argument might also be [SQLITE_UTF16_ALIGNED] to indicate that +** the routine expects pointers to 16-bit word aligned strings +** of UTF16 in the native byte order of the host computer. +** +** A pointer to the user supplied routine must be passed as the fifth +** argument. If it is NULL, this is the same as deleting the collation +** sequence (so that SQLite cannot call it anymore). +** Each time the application +** supplied function is invoked, it is passed a copy of the void* passed as +** the fourth argument to sqlite3_create_collation() or +** sqlite3_create_collation16() as its first parameter. +** +** The remaining arguments to the application-supplied routine are two strings, +** each represented by a (length, data) pair and encoded in the encoding +** that was passed as the third argument when the collation sequence was +** registered. {END} The application defined collation routine should +** return negative, zero or positive if +** the first string is less than, equal to, or greater than the second +** string. i.e. (STRING1 - STRING2). +** +** The sqlite3_create_collation_v2() works like sqlite3_create_collation() +** excapt that it takes an extra argument which is a destructor for +** the collation. The destructor is called when the collation is +** destroyed and is passed a copy of the fourth parameter void* pointer +** of the sqlite3_create_collation_v2(). +** Collations are destroyed when +** they are overridden by later calls to the collation creation functions +** or when the [sqlite3*] database handle is closed using [sqlite3_close()]. +** +** INVARIANTS: +** +** {F16603} A successful call to the +** [sqlite3_create_collation_v2(B,X,E,P,F,D)] interface +** registers function F as the comparison function used to +** implement collation X on [database connection] B for +** databases having encoding E. +** +** {F16604} SQLite understands the X parameter to +** [sqlite3_create_collation_v2(B,X,E,P,F,D)] as a zero-terminated +** UTF-8 string in which case is ignored for ASCII characters and +** is significant for non-ASCII characters. +** +** {F16606} Successive calls to [sqlite3_create_collation_v2(B,X,E,P,F,D)] +** with the same values for B, X, and E, override prior values +** of P, F, and D. +** +** {F16609} The destructor D in [sqlite3_create_collation_v2(B,X,E,P,F,D)] +** is not NULL then it is called with argument P when the +** collating function is dropped by SQLite. +** +** {F16612} A collating function is dropped when it is overloaded. +** +** {F16615} A collating function is dropped when the database connection +** is closed using [sqlite3_close()]. +** +** {F16618} The pointer P in [sqlite3_create_collation_v2(B,X,E,P,F,D)] +** is passed through as the first parameter to the comparison +** function F for all subsequent invocations of F. +** +** {F16621} A call to [sqlite3_create_collation(B,X,E,P,F)] is exactly +** the same as a call to [sqlite3_create_collation_v2()] with +** the same parameters and a NULL destructor. +** +** {F16624} Following a [sqlite3_create_collation_v2(B,X,E,P,F,D)], +** SQLite uses the comparison function F for all text comparison +** operations on [database connection] B on text values that +** use the collating sequence name X. +** +** {F16627} The [sqlite3_create_collation16(B,X,E,P,F)] works the same +** as [sqlite3_create_collation(B,X,E,P,F)] except that the +** collation name X is understood as UTF-16 in native byte order +** instead of UTF-8. +** +** {F16630} When multiple comparison functions are available for the same +** collating sequence, SQLite chooses the one whose text encoding +** requires the least amount of conversion from the default +** text encoding of the database. +*/ +int sqlite3_create_collation( + sqlite3*, + const char *zName, + int eTextRep, + void*, + int(*xCompare)(void*,int,const void*,int,const void*) +); +int sqlite3_create_collation_v2( + sqlite3*, + const char *zName, + int eTextRep, + void*, + int(*xCompare)(void*,int,const void*,int,const void*), + void(*xDestroy)(void*) +); +int sqlite3_create_collation16( + sqlite3*, + const char *zName, + int eTextRep, + void*, + int(*xCompare)(void*,int,const void*,int,const void*) +); + +/* +** CAPI3REF: Collation Needed Callbacks {F16700} +** +** To avoid having to register all collation sequences before a database +** can be used, a single callback function may be registered with the +** database handle to be called whenever an undefined collation sequence is +** required. +** +** If the function is registered using the sqlite3_collation_needed() API, +** then it is passed the names of undefined collation sequences as strings +** encoded in UTF-8. {F16703} If sqlite3_collation_needed16() is used, the names +** are passed as UTF-16 in machine native byte order. A call to either +** function replaces any existing callback. +** +** When the callback is invoked, the first argument passed is a copy +** of the second argument to sqlite3_collation_needed() or +** sqlite3_collation_needed16(). The second argument is the database +** handle. The third argument is one of [SQLITE_UTF8], +** [SQLITE_UTF16BE], or [SQLITE_UTF16LE], indicating the most +** desirable form of the collation sequence function required. +** The fourth parameter is the name of the +** required collation sequence. +** +** The callback function should register the desired collation using +** [sqlite3_create_collation()], [sqlite3_create_collation16()], or +** [sqlite3_create_collation_v2()]. +** +** INVARIANTS: +** +** {F16702} A successful call to [sqlite3_collation_needed(D,P,F)] +** or [sqlite3_collation_needed16(D,P,F)] causes +** the [database connection] D to invoke callback F with first +** parameter P whenever it needs a comparison function for a +** collating sequence that it does not know about. +** +** {F16704} Each successful call to [sqlite3_collation_needed()] or +** [sqlite3_collation_needed16()] overrides the callback registered +** on the same [database connection] by prior calls to either +** interface. +** +** {F16706} The name of the requested collating function passed in the +** 4th parameter to the callback is in UTF-8 if the callback +** was registered using [sqlite3_collation_needed()] and +** is in UTF-16 native byte order if the callback was +** registered using [sqlite3_collation_needed16()]. +** +** +*/ +int sqlite3_collation_needed( + sqlite3*, + void*, + void(*)(void*,sqlite3*,int eTextRep,const char*) +); +int sqlite3_collation_needed16( + sqlite3*, + void*, + void(*)(void*,sqlite3*,int eTextRep,const void*) +); + +/* +** Specify the key for an encrypted database. This routine should be +** called right after sqlite3_open(). +** +** The code to implement this API is not available in the public release +** of SQLite. +*/ +int sqlite3_key( + sqlite3 *db, /* Database to be rekeyed */ + const void *pKey, int nKey /* The key */ +); + +/* +** Change the key on an open database. If the current database is not +** encrypted, this routine will encrypt it. If pNew==0 or nNew==0, the +** database is decrypted. +** +** The code to implement this API is not available in the public release +** of SQLite. +*/ +int sqlite3_rekey( + sqlite3 *db, /* Database to be rekeyed */ + const void *pKey, int nKey /* The new key */ +); + +/* +** CAPI3REF: Suspend Execution For A Short Time {F10530} +** +** The sqlite3_sleep() function +** causes the current thread to suspend execution +** for at least a number of milliseconds specified in its parameter. +** +** If the operating system does not support sleep requests with +** millisecond time resolution, then the time will be rounded up to +** the nearest second. The number of milliseconds of sleep actually +** requested from the operating system is returned. +** +** SQLite implements this interface by calling the xSleep() +** method of the default [sqlite3_vfs] object. +** +** INVARIANTS: +** +** {F10533} The [sqlite3_sleep(M)] interface invokes the xSleep +** method of the default [sqlite3_vfs|VFS] in order to +** suspend execution of the current thread for at least +** M milliseconds. +** +** {F10536} The [sqlite3_sleep(M)] interface returns the number of +** milliseconds of sleep actually requested of the operating +** system, which might be larger than the parameter M. +*/ +int sqlite3_sleep(int); + +/* +** CAPI3REF: Name Of The Folder Holding Temporary Files {F10310} +** +** If this global variable is made to point to a string which is +** the name of a folder (a.ka. directory), then all temporary files +** created by SQLite will be placed in that directory. If this variable +** is NULL pointer, then SQLite does a search for an appropriate temporary +** file directory. +** +** It is not safe to modify this variable once a database connection +** has been opened. It is intended that this variable be set once +** as part of process initialization and before any SQLite interface +** routines have been call and remain unchanged thereafter. +*/ +SQLITE_EXTERN char *sqlite3_temp_directory; + +/* +** CAPI3REF: Test To See If The Database Is In Auto-Commit Mode {F12930} +** +** The sqlite3_get_autocommit() interfaces returns non-zero or +** zero if the given database connection is or is not in autocommit mode, +** respectively. Autocommit mode is on +** by default. Autocommit mode is disabled by a [BEGIN] statement. +** Autocommit mode is reenabled by a [COMMIT] or [ROLLBACK]. +** +** If certain kinds of errors occur on a statement within a multi-statement +** transactions (errors including [SQLITE_FULL], [SQLITE_IOERR], +** [SQLITE_NOMEM], [SQLITE_BUSY], and [SQLITE_INTERRUPT]) then the +** transaction might be rolled back automatically. The only way to +** find out if SQLite automatically rolled back the transaction after +** an error is to use this function. +** +** INVARIANTS: +** +** {F12931} The [sqlite3_get_autocommit(D)] interface returns non-zero or +** zero if the [database connection] D is or is not in autocommit +** mode, respectively. +** +** {F12932} Autocommit mode is on by default. +** +** {F12933} Autocommit mode is disabled by a successful [BEGIN] statement. +** +** {F12934} Autocommit mode is enabled by a successful [COMMIT] or [ROLLBACK] +** statement. +** +** +** LIMITATIONS: +*** +** {U12936} If another thread changes the autocommit status of the database +** connection while this routine is running, then the return value +** is undefined. +*/ +int sqlite3_get_autocommit(sqlite3*); + +/* +** CAPI3REF: Find The Database Handle Of A Prepared Statement {F13120} +** +** The sqlite3_db_handle interface +** returns the [sqlite3*] database handle to which a +** [prepared statement] belongs. +** The database handle returned by sqlite3_db_handle +** is the same database handle that was +** the first argument to the [sqlite3_prepare_v2()] or its variants +** that was used to create the statement in the first place. +** +** INVARIANTS: +** +** {F13123} The [sqlite3_db_handle(S)] interface returns a pointer +** to the [database connection] associated with +** [prepared statement] S. +*/ +sqlite3 *sqlite3_db_handle(sqlite3_stmt*); + + +/* +** CAPI3REF: Commit And Rollback Notification Callbacks {F12950} +** +** The sqlite3_commit_hook() interface registers a callback +** function to be invoked whenever a transaction is committed. +** Any callback set by a previous call to sqlite3_commit_hook() +** for the same database connection is overridden. +** The sqlite3_rollback_hook() interface registers a callback +** function to be invoked whenever a transaction is committed. +** Any callback set by a previous call to sqlite3_commit_hook() +** for the same database connection is overridden. +** The pArg argument is passed through +** to the callback. If the callback on a commit hook function +** returns non-zero, then the commit is converted into a rollback. +** +** If another function was previously registered, its +** pArg value is returned. Otherwise NULL is returned. +** +** Registering a NULL function disables the callback. +** +** For the purposes of this API, a transaction is said to have been +** rolled back if an explicit "ROLLBACK" statement is executed, or +** an error or constraint causes an implicit rollback to occur. +** The rollback callback is not invoked if a transaction is +** automatically rolled back because the database connection is closed. +** The rollback callback is not invoked if a transaction is +** rolled back because a commit callback returned non-zero. +** <todo> Check on this </todo> +** +** These are experimental interfaces and are subject to change. +** +** INVARIANTS: +** +** {F12951} The [sqlite3_commit_hook(D,F,P)] interface registers the +** callback function F to be invoked with argument P whenever +** a transaction commits on [database connection] D. +** +** {F12952} The [sqlite3_commit_hook(D,F,P)] interface returns the P +** argument from the previous call with the same +** [database connection ] D , or NULL on the first call +** for a particular [database connection] D. +** +** {F12953} Each call to [sqlite3_commit_hook()] overwrites the callback +** registered by prior calls. +** +** {F12954} If the F argument to [sqlite3_commit_hook(D,F,P)] is NULL +** then the commit hook callback is cancelled and no callback +** is invoked when a transaction commits. +** +** {F12955} If the commit callback returns non-zero then the commit is +** converted into a rollback. +** +** {F12961} The [sqlite3_rollback_hook(D,F,P)] interface registers the +** callback function F to be invoked with argument P whenever +** a transaction rolls back on [database connection] D. +** +** {F12962} The [sqlite3_rollback_hook(D,F,P)] interface returns the P +** argument from the previous call with the same +** [database connection ] D , or NULL on the first call +** for a particular [database connection] D. +** +** {F12963} Each call to [sqlite3_rollback_hook()] overwrites the callback +** registered by prior calls. +** +** {F12964} If the F argument to [sqlite3_rollback_hook(D,F,P)] is NULL +** then the rollback hook callback is cancelled and no callback +** is invoked when a transaction rolls back. +*/ +void *sqlite3_commit_hook(sqlite3*, int(*)(void*), void*); +void *sqlite3_rollback_hook(sqlite3*, void(*)(void *), void*); + +/* +** CAPI3REF: Data Change Notification Callbacks {F12970} +** +** The sqlite3_update_hook() interface +** registers a callback function with the database connection identified by the +** first argument to be invoked whenever a row is updated, inserted or deleted. +** Any callback set by a previous call to this function for the same +** database connection is overridden. +** +** The second argument is a pointer to the function to invoke when a +** row is updated, inserted or deleted. +** The first argument to the callback is +** a copy of the third argument to sqlite3_update_hook(). +** The second callback +** argument is one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE], +** depending on the operation that caused the callback to be invoked. +** The third and +** fourth arguments to the callback contain pointers to the database and +** table name containing the affected row. +** The final callback parameter is +** the rowid of the row. +** In the case of an update, this is the rowid after +** the update takes place. +** +** The update hook is not invoked when internal system tables are +** modified (i.e. sqlite_master and sqlite_sequence). +** +** If another function was previously registered, its pArg value +** is returned. Otherwise NULL is returned. +** +** INVARIANTS: +** +** {F12971} The [sqlite3_update_hook(D,F,P)] interface causes callback +** function F to be invoked with first parameter P whenever +** a table row is modified, inserted, or deleted on +** [database connection] D. +** +** {F12973} The [sqlite3_update_hook(D,F,P)] interface returns the value +** of P for the previous call on the same [database connection] D, +** or NULL for the first call. +** +** {F12975} If the update hook callback F in [sqlite3_update_hook(D,F,P)] +** is NULL then the no update callbacks are made. +** +** {F12977} Each call to [sqlite3_update_hook(D,F,P)] overrides prior calls +** to the same interface on the same [database connection] D. +** +** {F12979} The update hook callback is not invoked when internal system +** tables such as sqlite_master and sqlite_sequence are modified. +** +** {F12981} The second parameter to the update callback +** is one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE], +** depending on the operation that caused the callback to be invoked. +** +** {F12983} The third and fourth arguments to the callback contain pointers +** to zero-terminated UTF-8 strings which are the names of the +** database and table that is being updated. + +** {F12985} The final callback parameter is the rowid of the row after +** the change occurs. +*/ +void *sqlite3_update_hook( + sqlite3*, + void(*)(void *,int ,char const *,char const *,sqlite3_int64), + void* +); + +/* +** CAPI3REF: Enable Or Disable Shared Pager Cache {F10330} +** +** This routine enables or disables the sharing of the database cache +** and schema data structures between connections to the same database. +** Sharing is enabled if the argument is true and disabled if the argument +** is false. +** +** Cache sharing is enabled and disabled +** for an entire process. {END} This is a change as of SQLite version 3.5.0. +** In prior versions of SQLite, sharing was +** enabled or disabled for each thread separately. +** +** The cache sharing mode set by this interface effects all subsequent +** calls to [sqlite3_open()], [sqlite3_open_v2()], and [sqlite3_open16()]. +** Existing database connections continue use the sharing mode +** that was in effect at the time they were opened. +** +** Virtual tables cannot be used with a shared cache. When shared +** cache is enabled, the [sqlite3_create_module()] API used to register +** virtual tables will always return an error. +** +** This routine returns [SQLITE_OK] if shared cache was +** enabled or disabled successfully. An [error code] +** is returned otherwise. +** +** Shared cache is disabled by default. But this might change in +** future releases of SQLite. Applications that care about shared +** cache setting should set it explicitly. +** +** INVARIANTS: +** +** {F10331} A successful invocation of [sqlite3_enable_shared_cache(B)] +** will enable or disable shared cache mode for any subsequently +** created [database connection] in the same process. +** +** {F10336} When shared cache is enabled, the [sqlite3_create_module()] +** interface will always return an error. +** +** {F10337} The [sqlite3_enable_shared_cache(B)] interface returns +** [SQLITE_OK] if shared cache was enabled or disabled successfully. +** +** {F10339} Shared cache is disabled by default. +*/ +int sqlite3_enable_shared_cache(int); + +/* +** CAPI3REF: Attempt To Free Heap Memory {F17340} +** +** The sqlite3_release_memory() interface attempts to +** free N bytes of heap memory by deallocating non-essential memory +** allocations held by the database labrary. {END} Memory used +** to cache database pages to improve performance is an example of +** non-essential memory. Sqlite3_release_memory() returns +** the number of bytes actually freed, which might be more or less +** than the amount requested. +** +** INVARIANTS: +** +** {F17341} The [sqlite3_release_memory(N)] interface attempts to +** free N bytes of heap memory by deallocating non-essential +** memory allocations held by the database labrary. +** +** {F16342} The [sqlite3_release_memory(N)] returns the number +** of bytes actually freed, which might be more or less +** than the amount requested. +*/ +int sqlite3_release_memory(int); + +/* +** CAPI3REF: Impose A Limit On Heap Size {F17350} +** +** The sqlite3_soft_heap_limit() interface +** places a "soft" limit on the amount of heap memory that may be allocated +** by SQLite. If an internal allocation is requested +** that would exceed the soft heap limit, [sqlite3_release_memory()] is +** invoked one or more times to free up some space before the allocation +** is made. +** +** The limit is called "soft", because if +** [sqlite3_release_memory()] cannot +** free sufficient memory to prevent the limit from being exceeded, +** the memory is allocated anyway and the current operation proceeds. +** +** A negative or zero value for N means that there is no soft heap limit and +** [sqlite3_release_memory()] will only be called when memory is exhausted. +** The default value for the soft heap limit is zero. +** +** SQLite makes a best effort to honor the soft heap limit. +** But if the soft heap limit cannot honored, execution will +** continue without error or notification. This is why the limit is +** called a "soft" limit. It is advisory only. +** +** Prior to SQLite version 3.5.0, this routine only constrained the memory +** allocated by a single thread - the same thread in which this routine +** runs. Beginning with SQLite version 3.5.0, the soft heap limit is +** applied to all threads. The value specified for the soft heap limit +** is an upper bound on the total memory allocation for all threads. In +** version 3.5.0 there is no mechanism for limiting the heap usage for +** individual threads. +** +** INVARIANTS: +** +** {F16351} The [sqlite3_soft_heap_limit(N)] interface places a soft limit +** of N bytes on the amount of heap memory that may be allocated +** using [sqlite3_malloc()] or [sqlite3_realloc()] at any point +** in time. +** +** {F16352} If a call to [sqlite3_malloc()] or [sqlite3_realloc()] would +** cause the total amount of allocated memory to exceed the +** soft heap limit, then [sqlite3_release_memory()] is invoked +** in an attempt to reduce the memory usage prior to proceeding +** with the memory allocation attempt. +** +** {F16353} Calls to [sqlite3_malloc()] or [sqlite3_realloc()] that trigger +** attempts to reduce memory usage through the soft heap limit +** mechanism continue even if the attempt to reduce memory +** usage is unsuccessful. +** +** {F16354} A negative or zero value for N in a call to +** [sqlite3_soft_heap_limit(N)] means that there is no soft +** heap limit and [sqlite3_release_memory()] will only be +** called when memory is completely exhausted. +** +** {F16355} The default value for the soft heap limit is zero. +** +** {F16358} Each call to [sqlite3_soft_heap_limit(N)] overrides the +** values set by all prior calls. +*/ +void sqlite3_soft_heap_limit(int); + +/* +** CAPI3REF: Extract Metadata About A Column Of A Table {F12850} +** +** This routine +** returns meta-data about a specific column of a specific database +** table accessible using the connection handle passed as the first function +** argument. +** +** The column is identified by the second, third and fourth parameters to +** this function. The second parameter is either the name of the database +** (i.e. "main", "temp" or an attached database) containing the specified +** table or NULL. If it is NULL, then all attached databases are searched +** for the table using the same algorithm as the database engine uses to +** resolve unqualified table references. +** +** The third and fourth parameters to this function are the table and column +** name of the desired column, respectively. Neither of these parameters +** may be NULL. +** +** Meta information is returned by writing to the memory locations passed as +** the 5th and subsequent parameters to this function. Any of these +** arguments may be NULL, in which case the corresponding element of meta +** information is ommitted. +** +** <pre> +** Parameter Output Type Description +** ----------------------------------- +** +** 5th const char* Data type +** 6th const char* Name of the default collation sequence +** 7th int True if the column has a NOT NULL constraint +** 8th int True if the column is part of the PRIMARY KEY +** 9th int True if the column is AUTOINCREMENT +** </pre> +** +** +** The memory pointed to by the character pointers returned for the +** declaration type and collation sequence is valid only until the next +** call to any sqlite API function. +** +** If the specified table is actually a view, then an error is returned. +** +** If the specified column is "rowid", "oid" or "_rowid_" and an +** INTEGER PRIMARY KEY column has been explicitly declared, then the output +** parameters are set for the explicitly declared column. If there is no +** explicitly declared IPK column, then the output parameters are set as +** follows: +** +** <pre> +** data type: "INTEGER" +** collation sequence: "BINARY" +** not null: 0 +** primary key: 1 +** auto increment: 0 +** </pre> +** +** This function may load one or more schemas from database files. If an +** error occurs during this process, or if the requested table or column +** cannot be found, an SQLITE error code is returned and an error message +** left in the database handle (to be retrieved using sqlite3_errmsg()). +** +** This API is only available if the library was compiled with the +** SQLITE_ENABLE_COLUMN_METADATA preprocessor symbol defined. +*/ +int sqlite3_table_column_metadata( + sqlite3 *db, /* Connection handle */ + const char *zDbName, /* Database name or NULL */ + const char *zTableName, /* Table name */ + const char *zColumnName, /* Column name */ + char const **pzDataType, /* OUTPUT: Declared data type */ + char const **pzCollSeq, /* OUTPUT: Collation sequence name */ + int *pNotNull, /* OUTPUT: True if NOT NULL constraint exists */ + int *pPrimaryKey, /* OUTPUT: True if column part of PK */ + int *pAutoinc /* OUTPUT: True if column is auto-increment */ +); + +/* +** CAPI3REF: Load An Extension {F12600} +** +** {F12601} The sqlite3_load_extension() interface +** attempts to load an SQLite extension library contained in the file +** zFile. {F12602} The entry point is zProc. {F12603} zProc may be 0 +** in which case the name of the entry point defaults +** to "sqlite3_extension_init". +** +** {F12604} The sqlite3_load_extension() interface shall +** return [SQLITE_OK] on success and [SQLITE_ERROR] if something goes wrong. +** +** {F12605} +** If an error occurs and pzErrMsg is not 0, then the +** sqlite3_load_extension() interface shall attempt to fill *pzErrMsg with +** error message text stored in memory obtained from [sqlite3_malloc()]. +** {END} The calling function should free this memory +** by calling [sqlite3_free()]. +** +** {F12606} +** Extension loading must be enabled using [sqlite3_enable_load_extension()] +** prior to calling this API or an error will be returned. +*/ +int sqlite3_load_extension( + sqlite3 *db, /* Load the extension into this database connection */ + const char *zFile, /* Name of the shared library containing extension */ + const char *zProc, /* Entry point. Derived from zFile if 0 */ + char **pzErrMsg /* Put error message here if not 0 */ +); + +/* +** CAPI3REF: Enable Or Disable Extension Loading {F12620} +** +** So as not to open security holes in older applications that are +** unprepared to deal with extension loading, and as a means of disabling +** extension loading while evaluating user-entered SQL, the following +** API is provided to turn the [sqlite3_load_extension()] mechanism on and +** off. {F12622} It is off by default. {END} See ticket #1863. +** +** {F12621} Call the sqlite3_enable_load_extension() routine +** with onoff==1 to turn extension loading on +** and call it with onoff==0 to turn it back off again. {END} +*/ +int sqlite3_enable_load_extension(sqlite3 *db, int onoff); + +/* +** CAPI3REF: Make Arrangements To Automatically Load An Extension {F12640} +** +** {F12641} This function +** registers an extension entry point that is automatically invoked +** whenever a new database connection is opened using +** [sqlite3_open()], [sqlite3_open16()], or [sqlite3_open_v2()]. {END} +** +** This API can be invoked at program startup in order to register +** one or more statically linked extensions that will be available +** to all new database connections. +** +** {F12642} Duplicate extensions are detected so calling this routine multiple +** times with the same extension is harmless. +** +** {F12643} This routine stores a pointer to the extension in an array +** that is obtained from sqlite_malloc(). {END} If you run a memory leak +** checker on your program and it reports a leak because of this +** array, then invoke [sqlite3_reset_auto_extension()] prior +** to shutdown to free the memory. +** +** {F12644} Automatic extensions apply across all threads. {END} +** +** This interface is experimental and is subject to change or +** removal in future releases of SQLite. +*/ +int sqlite3_auto_extension(void *xEntryPoint); + + +/* +** CAPI3REF: Reset Automatic Extension Loading {F12660} +** +** {F12661} This function disables all previously registered +** automatic extensions. {END} This +** routine undoes the effect of all prior [sqlite3_auto_extension()] +** calls. +** +** {F12662} This call disabled automatic extensions in all threads. {END} +** +** This interface is experimental and is subject to change or +** removal in future releases of SQLite. +*/ +void sqlite3_reset_auto_extension(void); + + +/* +****** EXPERIMENTAL - subject to change without notice ************** +** +** The interface to the virtual-table mechanism is currently considered +** to be experimental. The interface might change in incompatible ways. +** If this is a problem for you, do not use the interface at this time. +** +** When the virtual-table mechanism stablizes, we will declare the +** interface fixed, support it indefinitely, and remove this comment. +*/ + +/* +** Structures used by the virtual table interface +*/ +typedef struct sqlite3_vtab sqlite3_vtab; +typedef struct sqlite3_index_info sqlite3_index_info; +typedef struct sqlite3_vtab_cursor sqlite3_vtab_cursor; +typedef struct sqlite3_module sqlite3_module; + +/* +** CAPI3REF: Virtual Table Object {F18000} +** KEYWORDS: sqlite3_module +** +** A module is a class of virtual tables. Each module is defined +** by an instance of the following structure. This structure consists +** mostly of methods for the module. +*/ +struct sqlite3_module { + int iVersion; + int (*xCreate)(sqlite3*, void *pAux, + int argc, const char *const*argv, + sqlite3_vtab **ppVTab, char**); + int (*xConnect)(sqlite3*, void *pAux, + int argc, const char *const*argv, + sqlite3_vtab **ppVTab, char**); + int (*xBestIndex)(sqlite3_vtab *pVTab, sqlite3_index_info*); + int (*xDisconnect)(sqlite3_vtab *pVTab); + int (*xDestroy)(sqlite3_vtab *pVTab); + int (*xOpen)(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor); + int (*xClose)(sqlite3_vtab_cursor*); + int (*xFilter)(sqlite3_vtab_cursor*, int idxNum, const char *idxStr, + int argc, sqlite3_value **argv); + int (*xNext)(sqlite3_vtab_cursor*); + int (*xEof)(sqlite3_vtab_cursor*); + int (*xColumn)(sqlite3_vtab_cursor*, sqlite3_context*, int); + int (*xRowid)(sqlite3_vtab_cursor*, sqlite3_int64 *pRowid); + int (*xUpdate)(sqlite3_vtab *, int, sqlite3_value **, sqlite3_int64 *); + int (*xBegin)(sqlite3_vtab *pVTab); + int (*xSync)(sqlite3_vtab *pVTab); + int (*xCommit)(sqlite3_vtab *pVTab); + int (*xRollback)(sqlite3_vtab *pVTab); + int (*xFindFunction)(sqlite3_vtab *pVtab, int nArg, const char *zName, + void (**pxFunc)(sqlite3_context*,int,sqlite3_value**), + void **ppArg); + + int (*xRename)(sqlite3_vtab *pVtab, const char *zNew); +}; + +/* +** CAPI3REF: Virtual Table Indexing Information {F18100} +** KEYWORDS: sqlite3_index_info +** +** The sqlite3_index_info structure and its substructures is used to +** pass information into and receive the reply from the xBestIndex +** method of an sqlite3_module. The fields under **Inputs** are the +** inputs to xBestIndex and are read-only. xBestIndex inserts its +** results into the **Outputs** fields. +** +** The aConstraint[] array records WHERE clause constraints of the +** form: +** +** column OP expr +** +** Where OP is =, <, <=, >, or >=. +** The particular operator is stored +** in aConstraint[].op. The index of the column is stored in +** aConstraint[].iColumn. aConstraint[].usable is TRUE if the +** expr on the right-hand side can be evaluated (and thus the constraint +** is usable) and false if it cannot. +** +** The optimizer automatically inverts terms of the form "expr OP column" +** and makes other simplifications to the WHERE clause in an attempt to +** get as many WHERE clause terms into the form shown above as possible. +** The aConstraint[] array only reports WHERE clause terms in the correct +** form that refer to the particular virtual table being queried. +** +** Information about the ORDER BY clause is stored in aOrderBy[]. +** Each term of aOrderBy records a column of the ORDER BY clause. +** +** The xBestIndex method must fill aConstraintUsage[] with information +** about what parameters to pass to xFilter. If argvIndex>0 then +** the right-hand side of the corresponding aConstraint[] is evaluated +** and becomes the argvIndex-th entry in argv. If aConstraintUsage[].omit +** is true, then the constraint is assumed to be fully handled by the +** virtual table and is not checked again by SQLite. +** +** The idxNum and idxPtr values are recorded and passed into xFilter. +** sqlite3_free() is used to free idxPtr if needToFreeIdxPtr is true. +** +** The orderByConsumed means that output from xFilter will occur in +** the correct order to satisfy the ORDER BY clause so that no separate +** sorting step is required. +** +** The estimatedCost value is an estimate of the cost of doing the +** particular lookup. A full scan of a table with N entries should have +** a cost of N. A binary search of a table of N entries should have a +** cost of approximately log(N). +*/ +struct sqlite3_index_info { + /* Inputs */ + int nConstraint; /* Number of entries in aConstraint */ + struct sqlite3_index_constraint { + int iColumn; /* Column on left-hand side of constraint */ + unsigned char op; /* Constraint operator */ + unsigned char usable; /* True if this constraint is usable */ + int iTermOffset; /* Used internally - xBestIndex should ignore */ + } *aConstraint; /* Table of WHERE clause constraints */ + int nOrderBy; /* Number of terms in the ORDER BY clause */ + struct sqlite3_index_orderby { + int iColumn; /* Column number */ + unsigned char desc; /* True for DESC. False for ASC. */ + } *aOrderBy; /* The ORDER BY clause */ + + /* Outputs */ + struct sqlite3_index_constraint_usage { + int argvIndex; /* if >0, constraint is part of argv to xFilter */ + unsigned char omit; /* Do not code a test for this constraint */ + } *aConstraintUsage; + int idxNum; /* Number used to identify the index */ + char *idxStr; /* String, possibly obtained from sqlite3_malloc */ + int needToFreeIdxStr; /* Free idxStr using sqlite3_free() if true */ + int orderByConsumed; /* True if output is already ordered */ + double estimatedCost; /* Estimated cost of using this index */ +}; +#define SQLITE_INDEX_CONSTRAINT_EQ 2 +#define SQLITE_INDEX_CONSTRAINT_GT 4 +#define SQLITE_INDEX_CONSTRAINT_LE 8 +#define SQLITE_INDEX_CONSTRAINT_LT 16 +#define SQLITE_INDEX_CONSTRAINT_GE 32 +#define SQLITE_INDEX_CONSTRAINT_MATCH 64 + +/* +** CAPI3REF: Register A Virtual Table Implementation {F18200} +** +** This routine is used to register a new module name with an SQLite +** connection. Module names must be registered before creating new +** virtual tables on the module, or before using preexisting virtual +** tables of the module. +*/ +int sqlite3_create_module( + sqlite3 *db, /* SQLite connection to register module with */ + const char *zName, /* Name of the module */ + const sqlite3_module *, /* Methods for the module */ + void * /* Client data for xCreate/xConnect */ +); + +/* +** CAPI3REF: Register A Virtual Table Implementation {F18210} +** +** This routine is identical to the sqlite3_create_module() method above, +** except that it allows a destructor function to be specified. It is +** even more experimental than the rest of the virtual tables API. +*/ +int sqlite3_create_module_v2( + sqlite3 *db, /* SQLite connection to register module with */ + const char *zName, /* Name of the module */ + const sqlite3_module *, /* Methods for the module */ + void *, /* Client data for xCreate/xConnect */ + void(*xDestroy)(void*) /* Module destructor function */ +); + +/* +** CAPI3REF: Virtual Table Instance Object {F18010} +** KEYWORDS: sqlite3_vtab +** +** Every module implementation uses a subclass of the following structure +** to describe a particular instance of the module. Each subclass will +** be tailored to the specific needs of the module implementation. The +** purpose of this superclass is to define certain fields that are common +** to all module implementations. +** +** Virtual tables methods can set an error message by assigning a +** string obtained from sqlite3_mprintf() to zErrMsg. The method should +** take care that any prior string is freed by a call to sqlite3_free() +** prior to assigning a new string to zErrMsg. After the error message +** is delivered up to the client application, the string will be automatically +** freed by sqlite3_free() and the zErrMsg field will be zeroed. Note +** that sqlite3_mprintf() and sqlite3_free() are used on the zErrMsg field +** since virtual tables are commonly implemented in loadable extensions which +** do not have access to sqlite3MPrintf() or sqlite3Free(). +*/ +struct sqlite3_vtab { + const sqlite3_module *pModule; /* The module for this virtual table */ + int nRef; /* Used internally */ + char *zErrMsg; /* Error message from sqlite3_mprintf() */ + /* Virtual table implementations will typically add additional fields */ +}; + +/* +** CAPI3REF: Virtual Table Cursor Object {F18020} +** KEYWORDS: sqlite3_vtab_cursor +** +** Every module implementation uses a subclass of the following structure +** to describe cursors that point into the virtual table and are used +** to loop through the virtual table. Cursors are created using the +** xOpen method of the module. Each module implementation will define +** the content of a cursor structure to suit its own needs. +** +** This superclass exists in order to define fields of the cursor that +** are common to all implementations. +*/ +struct sqlite3_vtab_cursor { + sqlite3_vtab *pVtab; /* Virtual table of this cursor */ + /* Virtual table implementations will typically add additional fields */ +}; + +/* +** CAPI3REF: Declare The Schema Of A Virtual Table {F18280} +** +** The xCreate and xConnect methods of a module use the following API +** to declare the format (the names and datatypes of the columns) of +** the virtual tables they implement. +*/ +int sqlite3_declare_vtab(sqlite3*, const char *zCreateTable); + +/* +** CAPI3REF: Overload A Function For A Virtual Table {F18300} +** +** Virtual tables can provide alternative implementations of functions +** using the xFindFunction method. But global versions of those functions +** must exist in order to be overloaded. +** +** This API makes sure a global version of a function with a particular +** name and number of parameters exists. If no such function exists +** before this API is called, a new function is created. The implementation +** of the new function always causes an exception to be thrown. So +** the new function is not good for anything by itself. Its only +** purpose is to be a place-holder function that can be overloaded +** by virtual tables. +** +** This API should be considered part of the virtual table interface, +** which is experimental and subject to change. +*/ +int sqlite3_overload_function(sqlite3*, const char *zFuncName, int nArg); + +/* +** The interface to the virtual-table mechanism defined above (back up +** to a comment remarkably similar to this one) is currently considered +** to be experimental. The interface might change in incompatible ways. +** If this is a problem for you, do not use the interface at this time. +** +** When the virtual-table mechanism stabilizes, we will declare the +** interface fixed, support it indefinitely, and remove this comment. +** +****** EXPERIMENTAL - subject to change without notice ************** +*/ + +/* +** CAPI3REF: A Handle To An Open BLOB {F17800} +** +** An instance of this object represents an open BLOB on which +** incremental I/O can be preformed. +** Objects of this type are created by +** [sqlite3_blob_open()] and destroyed by [sqlite3_blob_close()]. +** The [sqlite3_blob_read()] and [sqlite3_blob_write()] interfaces +** can be used to read or write small subsections of the blob. +** The [sqlite3_blob_bytes()] interface returns the size of the +** blob in bytes. +*/ +typedef struct sqlite3_blob sqlite3_blob; + +/* +** CAPI3REF: Open A BLOB For Incremental I/O {F17810} +** +** This interfaces opens a handle to the blob located +** in row iRow, column zColumn, table zTable in database zDb; +** in other words, the same blob that would be selected by: +** +** <pre> +** SELECT zColumn FROM zDb.zTable WHERE rowid = iRow; +** </pre> {END} +** +** If the flags parameter is non-zero, the blob is opened for +** read and write access. If it is zero, the blob is opened for read +** access. +** +** Note that the database name is not the filename that contains +** the database but rather the symbolic name of the database that +** is assigned when the database is connected using [ATTACH]. +** For the main database file, the database name is "main". For +** TEMP tables, the database name is "temp". +** +** On success, [SQLITE_OK] is returned and the new +** [sqlite3_blob | blob handle] is written to *ppBlob. +** Otherwise an error code is returned and +** any value written to *ppBlob should not be used by the caller. +** This function sets the database-handle error code and message +** accessible via [sqlite3_errcode()] and [sqlite3_errmsg()]. +** +** INVARIANTS: +** +** {F17813} A successful invocation of the [sqlite3_blob_open(D,B,T,C,R,F,P)] +** interface opens an [sqlite3_blob] object P on the blob +** in column C of table T in database B on [database connection] D. +** +** {F17814} A successful invocation of [sqlite3_blob_open(D,...)] starts +** a new transaction on [database connection] D if that connection +** is not already in a transaction. +** +** {F17816} The [sqlite3_blob_open(D,B,T,C,R,F,P)] interface opens the blob +** for read and write access if and only if the F parameter +** is non-zero. +** +** {F17819} The [sqlite3_blob_open()] interface returns [SQLITE_OK] on +** success and an appropriate [error code] on failure. +** +** {F17821} If an error occurs during evaluation of [sqlite3_blob_open(D,...)] +** then subsequent calls to [sqlite3_errcode(D)], +** [sqlite3_errmsg(D)], and [sqlite3_errmsg16(D)] will return +** information approprate for that error. +*/ +int sqlite3_blob_open( + sqlite3*, + const char *zDb, + const char *zTable, + const char *zColumn, + sqlite3_int64 iRow, + int flags, + sqlite3_blob **ppBlob +); + +/* +** CAPI3REF: Close A BLOB Handle {F17830} +** +** Close an open [sqlite3_blob | blob handle]. +** +** Closing a BLOB shall cause the current transaction to commit +** if there are no other BLOBs, no pending prepared statements, and the +** database connection is in autocommit mode. +** If any writes were made to the BLOB, they might be held in cache +** until the close operation if they will fit. {END} +** Closing the BLOB often forces the changes +** out to disk and so if any I/O errors occur, they will likely occur +** at the time when the BLOB is closed. {F17833} Any errors that occur during +** closing are reported as a non-zero return value. +** +** The BLOB is closed unconditionally. Even if this routine returns +** an error code, the BLOB is still closed. +** +** INVARIANTS: +** +** {F17833} The [sqlite3_blob_close(P)] interface closes an +** [sqlite3_blob] object P previously opened using +** [sqlite3_blob_open()]. +** +** {F17836} Closing an [sqlite3_blob] object using +** [sqlite3_blob_close()] shall cause the current transaction to +** commit if there are no other open [sqlite3_blob] objects +** or [prepared statements] on the same [database connection] and +** the [database connection] is in +** [sqlite3_get_autocommit | autocommit mode]. +** +** {F17839} The [sqlite3_blob_close(P)] interfaces closes the +** [sqlite3_blob] object P unconditionally, even if +** [sqlite3_blob_close(P)] returns something other than [SQLITE_OK]. +** +*/ +int sqlite3_blob_close(sqlite3_blob *); + +/* +** CAPI3REF: Return The Size Of An Open BLOB {F17840} +** +** Return the size in bytes of the blob accessible via the open +** [sqlite3_blob] object in its only argument. +** +** INVARIANTS: +** +** {F17843} The [sqlite3_blob_bytes(P)] interface returns the size +** in bytes of the BLOB that the [sqlite3_blob] object P +** refers to. +*/ +int sqlite3_blob_bytes(sqlite3_blob *); + +/* +** CAPI3REF: Read Data From A BLOB Incrementally {F17850} +** +** This function is used to read data from an open +** [sqlite3_blob | blob-handle] into a caller supplied buffer. +** N bytes of data are copied into buffer +** Z from the open blob, starting at offset iOffset. +** +** If offset iOffset is less than N bytes from the end of the blob, +** [SQLITE_ERROR] is returned and no data is read. If N or iOffset is +** less than zero [SQLITE_ERROR] is returned and no data is read. +** +** On success, SQLITE_OK is returned. Otherwise, an +** [error code] or an [extended error code] is returned. +** +** INVARIANTS: +** +** {F17853} The [sqlite3_blob_read(P,Z,N,X)] interface reads N bytes +** beginning at offset X from +** the blob that [sqlite3_blob] object P refers to +** and writes those N bytes into buffer Z. +** +** {F17856} In [sqlite3_blob_read(P,Z,N,X)] if the size of the blob +** is less than N+X bytes, then the function returns [SQLITE_ERROR] +** and nothing is read from the blob. +** +** {F17859} In [sqlite3_blob_read(P,Z,N,X)] if X or N is less than zero +** then the function returns [SQLITE_ERROR] +** and nothing is read from the blob. +** +** {F17862} The [sqlite3_blob_read(P,Z,N,X)] interface returns [SQLITE_OK] +** if N bytes where successfully read into buffer Z. +** +** {F17865} If the requested read could not be completed, +** the [sqlite3_blob_read(P,Z,N,X)] interface returns an +** appropriate [error code] or [extended error code]. +** +** {F17868} If an error occurs during evaluation of [sqlite3_blob_read(P,...)] +** then subsequent calls to [sqlite3_errcode(D)], +** [sqlite3_errmsg(D)], and [sqlite3_errmsg16(D)] will return +** information approprate for that error, where D is the +** database handle that was used to open blob handle P. +*/ +int sqlite3_blob_read(sqlite3_blob *, void *Z, int N, int iOffset); + +/* +** CAPI3REF: Write Data Into A BLOB Incrementally {F17870} +** +** This function is used to write data into an open +** [sqlite3_blob | blob-handle] from a user supplied buffer. +** n bytes of data are copied from the buffer +** pointed to by z into the open blob, starting at offset iOffset. +** +** If the [sqlite3_blob | blob-handle] passed as the first argument +** was not opened for writing (the flags parameter to [sqlite3_blob_open()] +*** was zero), this function returns [SQLITE_READONLY]. +** +** This function may only modify the contents of the blob; it is +** not possible to increase the size of a blob using this API. +** If offset iOffset is less than n bytes from the end of the blob, +** [SQLITE_ERROR] is returned and no data is written. If n is +** less than zero [SQLITE_ERROR] is returned and no data is written. +** +** On success, SQLITE_OK is returned. Otherwise, an +** [error code] or an [extended error code] is returned. +** +** INVARIANTS: +** +** {F17873} The [sqlite3_blob_write(P,Z,N,X)] interface writes N bytes +** from buffer Z into +** the blob that [sqlite3_blob] object P refers to +** beginning at an offset of X into the blob. +** +** {F17875} The [sqlite3_blob_write(P,Z,N,X)] interface returns +** [SQLITE_READONLY] if the [sqlite3_blob] object P was +** [sqlite3_blob_open | opened] for reading only. +** +** {F17876} In [sqlite3_blob_write(P,Z,N,X)] if the size of the blob +** is less than N+X bytes, then the function returns [SQLITE_ERROR] +** and nothing is written into the blob. +** +** {F17879} In [sqlite3_blob_write(P,Z,N,X)] if X or N is less than zero +** then the function returns [SQLITE_ERROR] +** and nothing is written into the blob. +** +** {F17882} The [sqlite3_blob_write(P,Z,N,X)] interface returns [SQLITE_OK] +** if N bytes where successfully written into blob. +** +** {F17885} If the requested write could not be completed, +** the [sqlite3_blob_write(P,Z,N,X)] interface returns an +** appropriate [error code] or [extended error code]. +** +** {F17888} If an error occurs during evaluation of [sqlite3_blob_write(D,...)] +** then subsequent calls to [sqlite3_errcode(D)], +** [sqlite3_errmsg(D)], and [sqlite3_errmsg16(D)] will return +** information approprate for that error. +*/ +int sqlite3_blob_write(sqlite3_blob *, const void *z, int n, int iOffset); + +/* +** CAPI3REF: Virtual File System Objects {F11200} +** +** A virtual filesystem (VFS) is an [sqlite3_vfs] object +** that SQLite uses to interact +** with the underlying operating system. Most SQLite builds come with a +** single default VFS that is appropriate for the host computer. +** New VFSes can be registered and existing VFSes can be unregistered. +** The following interfaces are provided. +** +** The sqlite3_vfs_find() interface returns a pointer to +** a VFS given its name. Names are case sensitive. +** Names are zero-terminated UTF-8 strings. +** If there is no match, a NULL +** pointer is returned. If zVfsName is NULL then the default +** VFS is returned. +** +** New VFSes are registered with sqlite3_vfs_register(). +** Each new VFS becomes the default VFS if the makeDflt flag is set. +** The same VFS can be registered multiple times without injury. +** To make an existing VFS into the default VFS, register it again +** with the makeDflt flag set. If two different VFSes with the +** same name are registered, the behavior is undefined. If a +** VFS is registered with a name that is NULL or an empty string, +** then the behavior is undefined. +** +** Unregister a VFS with the sqlite3_vfs_unregister() interface. +** If the default VFS is unregistered, another VFS is chosen as +** the default. The choice for the new VFS is arbitrary. +** +** INVARIANTS: +** +** {F11203} The [sqlite3_vfs_find(N)] interface returns a pointer to the +** registered [sqlite3_vfs] object whose name exactly matches +** the zero-terminated UTF-8 string N, or it returns NULL if +** there is no match. +** +** {F11206} If the N parameter to [sqlite3_vfs_find(N)] is NULL then +** the function returns a pointer to the default [sqlite3_vfs] +** object if there is one, or NULL if there is no default +** [sqlite3_vfs] object. +** +** {F11209} The [sqlite3_vfs_register(P,F)] interface registers the +** well-formed [sqlite3_vfs] object P using the name given +** by the zName field of the object. +** +** {F11212} Using the [sqlite3_vfs_register(P,F)] interface to register +** the same [sqlite3_vfs] object multiple times is a harmless no-op. +** +** {F11215} The [sqlite3_vfs_register(P,F)] interface makes the +** the [sqlite3_vfs] object P the default [sqlite3_vfs] object +** if F is non-zero. +** +** {F11218} The [sqlite3_vfs_unregister(P)] interface unregisters the +** [sqlite3_vfs] object P so that it is no longer returned by +** subsequent calls to [sqlite3_vfs_find()]. +*/ +sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName); +int sqlite3_vfs_register(sqlite3_vfs*, int makeDflt); +int sqlite3_vfs_unregister(sqlite3_vfs*); + +/* +** CAPI3REF: Mutexes {F17000} +** +** The SQLite core uses these routines for thread +** synchronization. Though they are intended for internal +** use by SQLite, code that links against SQLite is +** permitted to use any of these routines. +** +** The SQLite source code contains multiple implementations +** of these mutex routines. An appropriate implementation +** is selected automatically at compile-time. The following +** implementations are available in the SQLite core: +** +** <ul> +** <li> SQLITE_MUTEX_OS2 +** <li> SQLITE_MUTEX_PTHREAD +** <li> SQLITE_MUTEX_W32 +** <li> SQLITE_MUTEX_NOOP +** </ul> +** +** The SQLITE_MUTEX_NOOP implementation is a set of routines +** that does no real locking and is appropriate for use in +** a single-threaded application. The SQLITE_MUTEX_OS2, +** SQLITE_MUTEX_PTHREAD, and SQLITE_MUTEX_W32 implementations +** are appropriate for use on os/2, unix, and windows. +** +** If SQLite is compiled with the SQLITE_MUTEX_APPDEF preprocessor +** macro defined (with "-DSQLITE_MUTEX_APPDEF=1"), then no mutex +** implementation is included with the library. The +** mutex interface routines defined here become external +** references in the SQLite library for which implementations +** must be provided by the application. This facility allows an +** application that links against SQLite to provide its own mutex +** implementation without having to modify the SQLite core. +** +** {F17011} The sqlite3_mutex_alloc() routine allocates a new +** mutex and returns a pointer to it. {F17012} If it returns NULL +** that means that a mutex could not be allocated. {F17013} SQLite +** will unwind its stack and return an error. {F17014} The argument +** to sqlite3_mutex_alloc() is one of these integer constants: +** +** <ul> +** <li> SQLITE_MUTEX_FAST +** <li> SQLITE_MUTEX_RECURSIVE +** <li> SQLITE_MUTEX_STATIC_MASTER +** <li> SQLITE_MUTEX_STATIC_MEM +** <li> SQLITE_MUTEX_STATIC_MEM2 +** <li> SQLITE_MUTEX_STATIC_PRNG +** <li> SQLITE_MUTEX_STATIC_LRU +** <li> SQLITE_MUTEX_STATIC_LRU2 +** </ul> {END} +** +** {F17015} The first two constants cause sqlite3_mutex_alloc() to create +** a new mutex. The new mutex is recursive when SQLITE_MUTEX_RECURSIVE +** is used but not necessarily so when SQLITE_MUTEX_FAST is used. {END} +** The mutex implementation does not need to make a distinction +** between SQLITE_MUTEX_RECURSIVE and SQLITE_MUTEX_FAST if it does +** not want to. {F17016} But SQLite will only request a recursive mutex in +** cases where it really needs one. {END} If a faster non-recursive mutex +** implementation is available on the host platform, the mutex subsystem +** might return such a mutex in response to SQLITE_MUTEX_FAST. +** +** {F17017} The other allowed parameters to sqlite3_mutex_alloc() each return +** a pointer to a static preexisting mutex. {END} Four static mutexes are +** used by the current version of SQLite. Future versions of SQLite +** may add additional static mutexes. Static mutexes are for internal +** use by SQLite only. Applications that use SQLite mutexes should +** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or +** SQLITE_MUTEX_RECURSIVE. +** +** {F17018} Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST +** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc() +** returns a different mutex on every call. {F17034} But for the static +** mutex types, the same mutex is returned on every call that has +** the same type number. {END} +** +** {F17019} The sqlite3_mutex_free() routine deallocates a previously +** allocated dynamic mutex. {F17020} SQLite is careful to deallocate every +** dynamic mutex that it allocates. {U17021} The dynamic mutexes must not be in +** use when they are deallocated. {U17022} Attempting to deallocate a static +** mutex results in undefined behavior. {F17023} SQLite never deallocates +** a static mutex. {END} +** +** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt +** to enter a mutex. {F17024} If another thread is already within the mutex, +** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return +** SQLITE_BUSY. {F17025} The sqlite3_mutex_try() interface returns SQLITE_OK +** upon successful entry. {F17026} Mutexes created using +** SQLITE_MUTEX_RECURSIVE can be entered multiple times by the same thread. +** {F17027} In such cases the, +** mutex must be exited an equal number of times before another thread +** can enter. {U17028} If the same thread tries to enter any other +** kind of mutex more than once, the behavior is undefined. +** {F17029} SQLite will never exhibit +** such behavior in its own use of mutexes. {END} +** +** Some systems (ex: windows95) do not the operation implemented by +** sqlite3_mutex_try(). On those systems, sqlite3_mutex_try() will +** always return SQLITE_BUSY. {F17030} The SQLite core only ever uses +** sqlite3_mutex_try() as an optimization so this is acceptable behavior. {END} +** +** {F17031} The sqlite3_mutex_leave() routine exits a mutex that was +** previously entered by the same thread. {U17032} The behavior +** is undefined if the mutex is not currently entered by the +** calling thread or is not currently allocated. {F17033} SQLite will +** never do either. {END} +** +** See also: [sqlite3_mutex_held()] and [sqlite3_mutex_notheld()]. +*/ +sqlite3_mutex *sqlite3_mutex_alloc(int); +void sqlite3_mutex_free(sqlite3_mutex*); +void sqlite3_mutex_enter(sqlite3_mutex*); +int sqlite3_mutex_try(sqlite3_mutex*); +void sqlite3_mutex_leave(sqlite3_mutex*); + +/* +** CAPI3REF: Mutex Verifcation Routines {F17080} +** +** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routines +** are intended for use inside assert() statements. {F17081} The SQLite core +** never uses these routines except inside an assert() and applications +** are advised to follow the lead of the core. {F17082} The core only +** provides implementations for these routines when it is compiled +** with the SQLITE_DEBUG flag. {U17087} External mutex implementations +** are only required to provide these routines if SQLITE_DEBUG is +** defined and if NDEBUG is not defined. +** +** {F17083} These routines should return true if the mutex in their argument +** is held or not held, respectively, by the calling thread. {END} +** +** {X17084} The implementation is not required to provided versions of these +** routines that actually work. +** If the implementation does not provide working +** versions of these routines, it should at least provide stubs +** that always return true so that one does not get spurious +** assertion failures. {END} +** +** {F17085} If the argument to sqlite3_mutex_held() is a NULL pointer then +** the routine should return 1. {END} This seems counter-intuitive since +** clearly the mutex cannot be held if it does not exist. But the +** the reason the mutex does not exist is because the build is not +** using mutexes. And we do not want the assert() containing the +** call to sqlite3_mutex_held() to fail, so a non-zero return is +** the appropriate thing to do. {F17086} The sqlite3_mutex_notheld() +** interface should also return 1 when given a NULL pointer. +*/ +int sqlite3_mutex_held(sqlite3_mutex*); +int sqlite3_mutex_notheld(sqlite3_mutex*); + +/* +** CAPI3REF: Mutex Types {F17001} +** +** {F17002} The [sqlite3_mutex_alloc()] interface takes a single argument +** which is one of these integer constants. {END} +*/ +#define SQLITE_MUTEX_FAST 0 +#define SQLITE_MUTEX_RECURSIVE 1 +#define SQLITE_MUTEX_STATIC_MASTER 2 +#define SQLITE_MUTEX_STATIC_MEM 3 /* sqlite3_malloc() */ +#define SQLITE_MUTEX_STATIC_MEM2 4 /* sqlite3_release_memory() */ +#define SQLITE_MUTEX_STATIC_PRNG 5 /* sqlite3_random() */ +#define SQLITE_MUTEX_STATIC_LRU 6 /* lru page list */ +#define SQLITE_MUTEX_STATIC_LRU2 7 /* lru page list */ + +/* +** CAPI3REF: Low-Level Control Of Database Files {F11300} +** +** {F11301} The [sqlite3_file_control()] interface makes a direct call to the +** xFileControl method for the [sqlite3_io_methods] object associated +** with a particular database identified by the second argument. {F11302} The +** name of the database is the name assigned to the database by the +** <a href="lang_attach.html">ATTACH</a> SQL command that opened the +** database. {F11303} To control the main database file, use the name "main" +** or a NULL pointer. {F11304} The third and fourth parameters to this routine +** are passed directly through to the second and third parameters of +** the xFileControl method. {F11305} The return value of the xFileControl +** method becomes the return value of this routine. +** +** {F11306} If the second parameter (zDbName) does not match the name of any +** open database file, then SQLITE_ERROR is returned. {F11307} This error +** code is not remembered and will not be recalled by [sqlite3_errcode()] +** or [sqlite3_errmsg()]. {U11308} The underlying xFileControl method might +** also return SQLITE_ERROR. {U11309} There is no way to distinguish between +** an incorrect zDbName and an SQLITE_ERROR return from the underlying +** xFileControl method. {END} +** +** See also: [SQLITE_FCNTL_LOCKSTATE] +*/ +int sqlite3_file_control(sqlite3*, const char *zDbName, int op, void*); + +/* +** CAPI3REF: Testing Interface {F11400} +** +** The sqlite3_test_control() interface is used to read out internal +** state of SQLite and to inject faults into SQLite for testing +** purposes. The first parameter a operation code that determines +** the number, meaning, and operation of all subsequent parameters. +** +** This interface is not for use by applications. It exists solely +** for verifying the correct operation of the SQLite library. Depending +** on how the SQLite library is compiled, this interface might not exist. +** +** The details of the operation codes, their meanings, the parameters +** they take, and what they do are all subject to change without notice. +** Unlike most of the SQLite API, this function is not guaranteed to +** operate consistently from one release to the next. +*/ +int sqlite3_test_control(int op, ...); + +/* +** CAPI3REF: Testing Interface Operation Codes {F11410} +** +** These constants are the valid operation code parameters used +** as the first argument to [sqlite3_test_control()]. +** +** These parameters and their meansing are subject to change +** without notice. These values are for testing purposes only. +** Applications should not use any of these parameters or the +** [sqlite3_test_control()] interface. +*/ +#define SQLITE_TESTCTRL_FAULT_CONFIG 1 +#define SQLITE_TESTCTRL_FAULT_FAILURES 2 +#define SQLITE_TESTCTRL_FAULT_BENIGN_FAILURES 3 +#define SQLITE_TESTCTRL_FAULT_PENDING 4 +#define SQLITE_TESTCTRL_PRNG_SAVE 5 +#define SQLITE_TESTCTRL_PRNG_RESTORE 6 +#define SQLITE_TESTCTRL_PRNG_RESET 7 +#define SQLITE_TESTCTRL_BITVEC_TEST 8 + + +/* +** Undo the hack that converts floating point types to integer for +** builds on processors without floating point support. +*/ +#ifdef SQLITE_OMIT_FLOATING_POINT +# undef double +#endif + +#ifdef __cplusplus +} /* End of the 'extern "C"' block */ +#endif +#endif |