diff options
Diffstat (limited to 'kopete/plugins/statistics/sqlite/insert.c')
| -rw-r--r-- | kopete/plugins/statistics/sqlite/insert.c | 1018 |
1 files changed, 1018 insertions, 0 deletions
diff --git a/kopete/plugins/statistics/sqlite/insert.c b/kopete/plugins/statistics/sqlite/insert.c new file mode 100644 index 00000000..65cbdc8f --- /dev/null +++ b/kopete/plugins/statistics/sqlite/insert.c @@ -0,0 +1,1018 @@ +/* +** 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 file contains C code routines that are called by the parser +** to handle INSERT statements in SQLite. +** +** $Id$ +*/ +#include "sqliteInt.h" + +/* +** Set P3 of the most recently inserted opcode to a column affinity +** string for index pIdx. A column affinity string has one character +** for each column in the table, according to the affinity of the column: +** +** Character Column affinity +** ------------------------------ +** 'n' NUMERIC +** 'i' INTEGER +** 't' TEXT +** 'o' NONE +*/ +void sqlite3IndexAffinityStr(Vdbe *v, Index *pIdx){ + if( !pIdx->zColAff ){ + /* The first time a column affinity string for a particular index is + ** required, it is allocated and populated here. It is then stored as + ** a member of the Index structure for subsequent use. + ** + ** The column affinity string will eventually be deleted by + ** sqliteDeleteIndex() when the Index structure itself is cleaned + ** up. + */ + int n; + Table *pTab = pIdx->pTable; + pIdx->zColAff = (char *)sqliteMalloc(pIdx->nColumn+1); + if( !pIdx->zColAff ){ + return; + } + for(n=0; n<pIdx->nColumn; n++){ + pIdx->zColAff[n] = pTab->aCol[pIdx->aiColumn[n]].affinity; + } + pIdx->zColAff[pIdx->nColumn] = '\0'; + } + + sqlite3VdbeChangeP3(v, -1, pIdx->zColAff, 0); +} + +/* +** Set P3 of the most recently inserted opcode to a column affinity +** string for table pTab. A column affinity string has one character +** for each column indexed by the index, according to the affinity of the +** column: +** +** Character Column affinity +** ------------------------------ +** 'n' NUMERIC +** 'i' INTEGER +** 't' TEXT +** 'o' NONE +*/ +void sqlite3TableAffinityStr(Vdbe *v, Table *pTab){ + /* The first time a column affinity string for a particular table + ** is required, it is allocated and populated here. It is then + ** stored as a member of the Table structure for subsequent use. + ** + ** The column affinity string will eventually be deleted by + ** sqlite3DeleteTable() when the Table structure itself is cleaned up. + */ + if( !pTab->zColAff ){ + char *zColAff; + int i; + + zColAff = (char *)sqliteMalloc(pTab->nCol+1); + if( !zColAff ){ + return; + } + + for(i=0; i<pTab->nCol; i++){ + zColAff[i] = pTab->aCol[i].affinity; + } + zColAff[pTab->nCol] = '\0'; + + pTab->zColAff = zColAff; + } + + sqlite3VdbeChangeP3(v, -1, pTab->zColAff, 0); +} + + +/* +** This routine is call to handle SQL of the following forms: +** +** insert into TABLE (IDLIST) values(EXPRLIST) +** insert into TABLE (IDLIST) select +** +** The IDLIST following the table name is always optional. If omitted, +** then a list of all columns for the table is substituted. The IDLIST +** appears in the pColumn parameter. pColumn is NULL if IDLIST is omitted. +** +** The pList parameter holds EXPRLIST in the first form of the INSERT +** statement above, and pSelect is NULL. For the second form, pList is +** NULL and pSelect is a pointer to the select statement used to generate +** data for the insert. +** +** The code generated follows one of three templates. For a simple +** select with data coming from a VALUES clause, the code executes +** once straight down through. The template looks like this: +** +** open write cursor to <table> and its indices +** puts VALUES clause expressions onto the stack +** write the resulting record into <table> +** cleanup +** +** If the statement is of the form +** +** INSERT INTO <table> SELECT ... +** +** And the SELECT clause does not read from <table> at any time, then +** the generated code follows this template: +** +** goto B +** A: setup for the SELECT +** loop over the tables in the SELECT +** gosub C +** end loop +** cleanup after the SELECT +** goto D +** B: open write cursor to <table> and its indices +** goto A +** C: insert the select result into <table> +** return +** D: cleanup +** +** The third template is used if the insert statement takes its +** values from a SELECT but the data is being inserted into a table +** that is also read as part of the SELECT. In the third form, +** we have to use a intermediate table to store the results of +** the select. The template is like this: +** +** goto B +** A: setup for the SELECT +** loop over the tables in the SELECT +** gosub C +** end loop +** cleanup after the SELECT +** goto D +** C: insert the select result into the intermediate table +** return +** B: open a cursor to an intermediate table +** goto A +** D: open write cursor to <table> and its indices +** loop over the intermediate table +** transfer values form intermediate table into <table> +** end the loop +** cleanup +*/ +void sqlite3Insert( + Parse *pParse, /* Parser context */ + SrcList *pTabList, /* Name of table into which we are inserting */ + ExprList *pList, /* List of values to be inserted */ + Select *pSelect, /* A SELECT statement to use as the data source */ + IdList *pColumn, /* Column names corresponding to IDLIST. */ + int onError /* How to handle constraint errors */ +){ + Table *pTab; /* The table to insert into */ + char *zTab; /* Name of the table into which we are inserting */ + const char *zDb; /* Name of the database holding this table */ + int i, j, idx; /* Loop counters */ + Vdbe *v; /* Generate code into this virtual machine */ + Index *pIdx; /* For looping over indices of the table */ + int nColumn; /* Number of columns in the data */ + int base = 0; /* VDBE Cursor number for pTab */ + int iCont=0,iBreak=0; /* Beginning and end of the loop over srcTab */ + sqlite3 *db; /* The main database structure */ + int keyColumn = -1; /* Column that is the INTEGER PRIMARY KEY */ + int endOfLoop; /* Label for the end of the insertion loop */ + int useTempTable; /* Store SELECT results in intermediate table */ + int srcTab = 0; /* Data comes from this temporary cursor if >=0 */ + int iSelectLoop = 0; /* Address of code that implements the SELECT */ + int iCleanup = 0; /* Address of the cleanup code */ + int iInsertBlock = 0; /* Address of the subroutine used to insert data */ + int iCntMem = 0; /* Memory cell used for the row counter */ + int isView; /* True if attempting to insert into a view */ + + int row_triggers_exist = 0; /* True if there are FOR EACH ROW triggers */ + int before_triggers; /* True if there are BEFORE triggers */ + int after_triggers; /* True if there are AFTER triggers */ + int newIdx = -1; /* Cursor for the NEW table */ + + if( pParse->nErr || sqlite3_malloc_failed ) goto insert_cleanup; + db = pParse->db; + + /* Locate the table into which we will be inserting new information. + */ + assert( pTabList->nSrc==1 ); + zTab = pTabList->a[0].zName; + if( zTab==0 ) goto insert_cleanup; + pTab = sqlite3SrcListLookup(pParse, pTabList); + if( pTab==0 ){ + goto insert_cleanup; + } + assert( pTab->iDb<db->nDb ); + zDb = db->aDb[pTab->iDb].zName; + if( sqlite3AuthCheck(pParse, SQLITE_INSERT, pTab->zName, 0, zDb) ){ + goto insert_cleanup; + } + + /* Ensure that: + * (a) the table is not read-only, + * (b) that if it is a view then ON INSERT triggers exist + */ + before_triggers = sqlite3TriggersExist(pParse, pTab->pTrigger, TK_INSERT, + TK_BEFORE, TK_ROW, 0); + after_triggers = sqlite3TriggersExist(pParse, pTab->pTrigger, TK_INSERT, + TK_AFTER, TK_ROW, 0); + row_triggers_exist = before_triggers || after_triggers; + isView = pTab->pSelect!=0; + if( sqlite3IsReadOnly(pParse, pTab, before_triggers) ){ + goto insert_cleanup; + } + if( pTab==0 ) goto insert_cleanup; + + /* If pTab is really a view, make sure it has been initialized. + */ + if( isView && sqlite3ViewGetColumnNames(pParse, pTab) ){ + goto insert_cleanup; + } + + /* Ensure all required collation sequences are available. */ + for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){ + if( sqlite3CheckIndexCollSeq(pParse, pIdx) ){ + goto insert_cleanup; + } + } + + /* Allocate a VDBE + */ + v = sqlite3GetVdbe(pParse); + if( v==0 ) goto insert_cleanup; + sqlite3VdbeCountChanges(v); + sqlite3BeginWriteOperation(pParse, pSelect || row_triggers_exist, pTab->iDb); + + /* if there are row triggers, allocate a temp table for new.* references. */ + if( row_triggers_exist ){ + newIdx = pParse->nTab++; + } + + /* Figure out how many columns of data are supplied. If the data + ** is coming from a SELECT statement, then this step also generates + ** all the code to implement the SELECT statement and invoke a subroutine + ** to process each row of the result. (Template 2.) If the SELECT + ** statement uses the the table that is being inserted into, then the + ** subroutine is also coded here. That subroutine stores the SELECT + ** results in a temporary table. (Template 3.) + */ + if( pSelect ){ + /* Data is coming from a SELECT. Generate code to implement that SELECT + */ + int rc, iInitCode; + iInitCode = sqlite3VdbeAddOp(v, OP_Goto, 0, 0); + iSelectLoop = sqlite3VdbeCurrentAddr(v); + iInsertBlock = sqlite3VdbeMakeLabel(v); + rc = sqlite3Select(pParse, pSelect, SRT_Subroutine, iInsertBlock, 0,0,0,0); + if( rc || pParse->nErr || sqlite3_malloc_failed ) goto insert_cleanup; + iCleanup = sqlite3VdbeMakeLabel(v); + sqlite3VdbeAddOp(v, OP_Goto, 0, iCleanup); + assert( pSelect->pEList ); + nColumn = pSelect->pEList->nExpr; + + /* Set useTempTable to TRUE if the result of the SELECT statement + ** should be written into a temporary table. Set to FALSE if each + ** row of the SELECT can be written directly into the result table. + ** + ** A temp table must be used if the table being updated is also one + ** of the tables being read by the SELECT statement. Also use a + ** temp table in the case of row triggers. + */ + if( row_triggers_exist ){ + useTempTable = 1; + }else{ + int addr = 0; + useTempTable = 0; + while( useTempTable==0 ){ + VdbeOp *pOp; + addr = sqlite3VdbeFindOp(v, addr, OP_OpenRead, pTab->tnum); + if( addr==0 ) break; + pOp = sqlite3VdbeGetOp(v, addr-2); + if( pOp->opcode==OP_Integer && pOp->p1==pTab->iDb ){ + useTempTable = 1; + } + } + } + + if( useTempTable ){ + /* Generate the subroutine that SELECT calls to process each row of + ** the result. Store the result in a temporary table + */ + srcTab = pParse->nTab++; + sqlite3VdbeResolveLabel(v, iInsertBlock); + sqlite3VdbeAddOp(v, OP_MakeRecord, nColumn, 0); + sqlite3TableAffinityStr(v, pTab); + sqlite3VdbeAddOp(v, OP_NewRecno, srcTab, 0); + sqlite3VdbeAddOp(v, OP_Pull, 1, 0); + sqlite3VdbeAddOp(v, OP_PutIntKey, srcTab, 0); + sqlite3VdbeAddOp(v, OP_Return, 0, 0); + + /* The following code runs first because the GOTO at the very top + ** of the program jumps to it. Create the temporary table, then jump + ** back up and execute the SELECT code above. + */ + sqlite3VdbeChangeP2(v, iInitCode, sqlite3VdbeCurrentAddr(v)); + sqlite3VdbeAddOp(v, OP_OpenTemp, srcTab, 0); + sqlite3VdbeAddOp(v, OP_SetNumColumns, srcTab, nColumn); + sqlite3VdbeAddOp(v, OP_Goto, 0, iSelectLoop); + sqlite3VdbeResolveLabel(v, iCleanup); + }else{ + sqlite3VdbeChangeP2(v, iInitCode, sqlite3VdbeCurrentAddr(v)); + } + }else{ + /* This is the case if the data for the INSERT is coming from a VALUES + ** clause + */ + SrcList dummy; + assert( pList!=0 ); + srcTab = -1; + useTempTable = 0; + assert( pList ); + nColumn = pList->nExpr; + dummy.nSrc = 0; + for(i=0; i<nColumn; i++){ + if( sqlite3ExprResolveAndCheck(pParse,&dummy,0,pList->a[i].pExpr,0,0) ){ + goto insert_cleanup; + } + } + } + + /* Make sure the number of columns in the source data matches the number + ** of columns to be inserted into the table. + */ + if( pColumn==0 && nColumn!=pTab->nCol ){ + sqlite3ErrorMsg(pParse, + "table %S has %d columns but %d values were supplied", + pTabList, 0, pTab->nCol, nColumn); + goto insert_cleanup; + } + if( pColumn!=0 && nColumn!=pColumn->nId ){ + sqlite3ErrorMsg(pParse, "%d values for %d columns", nColumn, pColumn->nId); + goto insert_cleanup; + } + + /* If the INSERT statement included an IDLIST term, then make sure + ** all elements of the IDLIST really are columns of the table and + ** remember the column indices. + ** + ** If the table has an INTEGER PRIMARY KEY column and that column + ** is named in the IDLIST, then record in the keyColumn variable + ** the index into IDLIST of the primary key column. keyColumn is + ** the index of the primary key as it appears in IDLIST, not as + ** is appears in the original table. (The index of the primary + ** key in the original table is pTab->iPKey.) + */ + if( pColumn ){ + for(i=0; i<pColumn->nId; i++){ + pColumn->a[i].idx = -1; + } + for(i=0; i<pColumn->nId; i++){ + for(j=0; j<pTab->nCol; j++){ + if( sqlite3StrICmp(pColumn->a[i].zName, pTab->aCol[j].zName)==0 ){ + pColumn->a[i].idx = j; + if( j==pTab->iPKey ){ + keyColumn = i; + } + break; + } + } + if( j>=pTab->nCol ){ + if( sqlite3IsRowid(pColumn->a[i].zName) ){ + keyColumn = i; + }else{ + sqlite3ErrorMsg(pParse, "table %S has no column named %s", + pTabList, 0, pColumn->a[i].zName); + pParse->nErr++; + goto insert_cleanup; + } + } + } + } + + /* If there is no IDLIST term but the table has an integer primary + ** key, the set the keyColumn variable to the primary key column index + ** in the original table definition. + */ + if( pColumn==0 ){ + keyColumn = pTab->iPKey; + } + + /* Open the temp table for FOR EACH ROW triggers + */ + if( row_triggers_exist ){ + sqlite3VdbeAddOp(v, OP_OpenPseudo, newIdx, 0); + sqlite3VdbeAddOp(v, OP_SetNumColumns, newIdx, pTab->nCol); + } + + /* Initialize the count of rows to be inserted + */ + if( db->flags & SQLITE_CountRows ){ + iCntMem = pParse->nMem++; + sqlite3VdbeAddOp(v, OP_Integer, 0, 0); + sqlite3VdbeAddOp(v, OP_MemStore, iCntMem, 1); + } + + /* Open tables and indices if there are no row triggers */ + if( !row_triggers_exist ){ + base = pParse->nTab; + sqlite3OpenTableAndIndices(pParse, pTab, base, OP_OpenWrite); + } + + /* If the data source is a temporary table, then we have to create + ** a loop because there might be multiple rows of data. If the data + ** source is a subroutine call from the SELECT statement, then we need + ** to launch the SELECT statement processing. + */ + if( useTempTable ){ + iBreak = sqlite3VdbeMakeLabel(v); + sqlite3VdbeAddOp(v, OP_Rewind, srcTab, iBreak); + iCont = sqlite3VdbeCurrentAddr(v); + }else if( pSelect ){ + sqlite3VdbeAddOp(v, OP_Goto, 0, iSelectLoop); + sqlite3VdbeResolveLabel(v, iInsertBlock); + } + + /* Run the BEFORE and INSTEAD OF triggers, if there are any + */ + endOfLoop = sqlite3VdbeMakeLabel(v); + if( before_triggers ){ + + /* build the NEW.* reference row. Note that if there is an INTEGER + ** PRIMARY KEY into which a NULL is being inserted, that NULL will be + ** translated into a unique ID for the row. But on a BEFORE trigger, + ** we do not know what the unique ID will be (because the insert has + ** not happened yet) so we substitute a rowid of -1 + */ + if( keyColumn<0 ){ + sqlite3VdbeAddOp(v, OP_Integer, -1, 0); + }else if( useTempTable ){ + sqlite3VdbeAddOp(v, OP_Column, srcTab, keyColumn); + }else if( pSelect ){ + sqlite3VdbeAddOp(v, OP_Dup, nColumn - keyColumn - 1, 1); + }else{ + sqlite3ExprCode(pParse, pList->a[keyColumn].pExpr); + sqlite3VdbeAddOp(v, OP_NotNull, -1, sqlite3VdbeCurrentAddr(v)+3); + sqlite3VdbeAddOp(v, OP_Pop, 1, 0); + sqlite3VdbeAddOp(v, OP_Integer, -1, 0); + sqlite3VdbeAddOp(v, OP_MustBeInt, 0, 0); + } + + /* Create the new column data + */ + for(i=0; i<pTab->nCol; i++){ + if( pColumn==0 ){ + j = i; + }else{ + for(j=0; j<pColumn->nId; j++){ + if( pColumn->a[j].idx==i ) break; + } + } + if( pColumn && j>=pColumn->nId ){ + sqlite3VdbeOp3(v, OP_String8, 0, 0, pTab->aCol[i].zDflt, P3_STATIC); + }else if( useTempTable ){ + sqlite3VdbeAddOp(v, OP_Column, srcTab, j); + }else if( pSelect ){ + sqlite3VdbeAddOp(v, OP_Dup, nColumn-j-1, 1); + }else{ + sqlite3ExprCode(pParse, pList->a[j].pExpr); + } + } + sqlite3VdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0); + + /* If this is an INSERT on a view with an INSTEAD OF INSERT trigger, + ** do not attempt any conversions before assembling the record. + ** If this is a real table, attempt conversions as required by the + ** table column affinities. + */ + if( !isView ){ + sqlite3TableAffinityStr(v, pTab); + } + sqlite3VdbeAddOp(v, OP_PutIntKey, newIdx, 0); + + /* Fire BEFORE or INSTEAD OF triggers */ + if( sqlite3CodeRowTrigger(pParse, TK_INSERT, 0, TK_BEFORE, pTab, + newIdx, -1, onError, endOfLoop) ){ + goto insert_cleanup; + } + } + + /* If any triggers exists, the opening of tables and indices is deferred + ** until now. + */ + if( row_triggers_exist && !isView ){ + base = pParse->nTab; + sqlite3OpenTableAndIndices(pParse, pTab, base, OP_OpenWrite); + } + + /* Push the record number for the new entry onto the stack. The + ** record number is a randomly generate integer created by NewRecno + ** except when the table has an INTEGER PRIMARY KEY column, in which + ** case the record number is the same as that column. + */ + if( !isView ){ + if( keyColumn>=0 ){ + if( useTempTable ){ + sqlite3VdbeAddOp(v, OP_Column, srcTab, keyColumn); + }else if( pSelect ){ + sqlite3VdbeAddOp(v, OP_Dup, nColumn - keyColumn - 1, 1); + }else{ + sqlite3ExprCode(pParse, pList->a[keyColumn].pExpr); + } + /* If the PRIMARY KEY expression is NULL, then use OP_NewRecno + ** to generate a unique primary key value. + */ + sqlite3VdbeAddOp(v, OP_NotNull, -1, sqlite3VdbeCurrentAddr(v)+3); + sqlite3VdbeAddOp(v, OP_Pop, 1, 0); + sqlite3VdbeAddOp(v, OP_NewRecno, base, 0); + sqlite3VdbeAddOp(v, OP_MustBeInt, 0, 0); + }else{ + sqlite3VdbeAddOp(v, OP_NewRecno, base, 0); + } + + /* Push onto the stack, data for all columns of the new entry, beginning + ** with the first column. + */ + for(i=0; i<pTab->nCol; i++){ + if( i==pTab->iPKey ){ + /* The value of the INTEGER PRIMARY KEY column is always a NULL. + ** Whenever this column is read, the record number will be substituted + ** in its place. So will fill this column with a NULL to avoid + ** taking up data space with information that will never be used. */ + sqlite3VdbeAddOp(v, OP_String8, 0, 0); + continue; + } + if( pColumn==0 ){ + j = i; + }else{ + for(j=0; j<pColumn->nId; j++){ + if( pColumn->a[j].idx==i ) break; + } + } + if( pColumn && j>=pColumn->nId ){ + sqlite3VdbeOp3(v, OP_String8, 0, 0, pTab->aCol[i].zDflt, P3_STATIC); + }else if( useTempTable ){ + sqlite3VdbeAddOp(v, OP_Column, srcTab, j); + }else if( pSelect ){ + sqlite3VdbeAddOp(v, OP_Dup, i+nColumn-j, 1); + }else{ + sqlite3ExprCode(pParse, pList->a[j].pExpr); + } + } + + /* Generate code to check constraints and generate index keys and + ** do the insertion. + */ + sqlite3GenerateConstraintChecks(pParse, pTab, base, 0, keyColumn>=0, + 0, onError, endOfLoop); + sqlite3CompleteInsertion(pParse, pTab, base, 0,0,0, + after_triggers ? newIdx : -1); + } + + /* Update the count of rows that are inserted + */ + if( (db->flags & SQLITE_CountRows)!=0 ){ + sqlite3VdbeAddOp(v, OP_MemIncr, iCntMem, 0); + } + + if( row_triggers_exist ){ + /* Close all tables opened */ + if( !isView ){ + sqlite3VdbeAddOp(v, OP_Close, base, 0); + for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){ + sqlite3VdbeAddOp(v, OP_Close, idx+base, 0); + } + } + + /* Code AFTER triggers */ + if( sqlite3CodeRowTrigger(pParse, TK_INSERT, 0, TK_AFTER, pTab, newIdx, -1, + onError, endOfLoop) ){ + goto insert_cleanup; + } + } + + /* The bottom of the loop, if the data source is a SELECT statement + */ + sqlite3VdbeResolveLabel(v, endOfLoop); + if( useTempTable ){ + sqlite3VdbeAddOp(v, OP_Next, srcTab, iCont); + sqlite3VdbeResolveLabel(v, iBreak); + sqlite3VdbeAddOp(v, OP_Close, srcTab, 0); + }else if( pSelect ){ + sqlite3VdbeAddOp(v, OP_Pop, nColumn, 0); + sqlite3VdbeAddOp(v, OP_Return, 0, 0); + sqlite3VdbeResolveLabel(v, iCleanup); + } + + if( !row_triggers_exist ){ + /* Close all tables opened */ + sqlite3VdbeAddOp(v, OP_Close, base, 0); + for(idx=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, idx++){ + sqlite3VdbeAddOp(v, OP_Close, idx+base, 0); + } + } + + /* + ** Return the number of rows inserted. + */ + if( db->flags & SQLITE_CountRows ){ + sqlite3VdbeAddOp(v, OP_MemLoad, iCntMem, 0); + sqlite3VdbeAddOp(v, OP_Callback, 1, 0); + sqlite3VdbeSetNumCols(v, 1); + sqlite3VdbeSetColName(v, 0, "rows inserted", P3_STATIC); + } + +insert_cleanup: + sqlite3SrcListDelete(pTabList); + if( pList ) sqlite3ExprListDelete(pList); + if( pSelect ) sqlite3SelectDelete(pSelect); + sqlite3IdListDelete(pColumn); +} + +/* +** Generate code to do a constraint check prior to an INSERT or an UPDATE. +** +** When this routine is called, the stack contains (from bottom to top) +** the following values: +** +** 1. The recno of the row to be updated before the update. This +** value is omitted unless we are doing an UPDATE that involves a +** change to the record number. +** +** 2. The recno of the row after the update. +** +** 3. The data in the first column of the entry after the update. +** +** i. Data from middle columns... +** +** N. The data in the last column of the entry after the update. +** +** The old recno shown as entry (1) above is omitted unless both isUpdate +** and recnoChng are 1. isUpdate is true for UPDATEs and false for +** INSERTs and recnoChng is true if the record number is being changed. +** +** The code generated by this routine pushes additional entries onto +** the stack which are the keys for new index entries for the new record. +** The order of index keys is the same as the order of the indices on +** the pTable->pIndex list. A key is only created for index i if +** aIdxUsed!=0 and aIdxUsed[i]!=0. +** +** This routine also generates code to check constraints. NOT NULL, +** CHECK, and UNIQUE constraints are all checked. If a constraint fails, +** then the appropriate action is performed. There are five possible +** actions: ROLLBACK, ABORT, FAIL, REPLACE, and IGNORE. +** +** Constraint type Action What Happens +** --------------- ---------- ---------------------------------------- +** any ROLLBACK The current transaction is rolled back and +** sqlite3_exec() returns immediately with a +** return code of SQLITE_CONSTRAINT. +** +** any ABORT Back out changes from the current command +** only (do not do a complete rollback) then +** cause sqlite3_exec() to return immediately +** with SQLITE_CONSTRAINT. +** +** any FAIL Sqlite_exec() returns immediately with a +** return code of SQLITE_CONSTRAINT. The +** transaction is not rolled back and any +** prior changes are retained. +** +** any IGNORE The record number and data is popped from +** the stack and there is an immediate jump +** to label ignoreDest. +** +** NOT NULL REPLACE The NULL value is replace by the default +** value for that column. If the default value +** is NULL, the action is the same as ABORT. +** +** UNIQUE REPLACE The other row that conflicts with the row +** being inserted is removed. +** +** CHECK REPLACE Illegal. The results in an exception. +** +** Which action to take is determined by the overrideError parameter. +** Or if overrideError==OE_Default, then the pParse->onError parameter +** is used. Or if pParse->onError==OE_Default then the onError value +** for the constraint is used. +** +** The calling routine must open a read/write cursor for pTab with +** cursor number "base". All indices of pTab must also have open +** read/write cursors with cursor number base+i for the i-th cursor. +** Except, if there is no possibility of a REPLACE action then +** cursors do not need to be open for indices where aIdxUsed[i]==0. +** +** If the isUpdate flag is true, it means that the "base" cursor is +** initially pointing to an entry that is being updated. The isUpdate +** flag causes extra code to be generated so that the "base" cursor +** is still pointing at the same entry after the routine returns. +** Without the isUpdate flag, the "base" cursor might be moved. +*/ +void sqlite3GenerateConstraintChecks( + Parse *pParse, /* The parser context */ + Table *pTab, /* the table into which we are inserting */ + int base, /* Index of a read/write cursor pointing at pTab */ + char *aIdxUsed, /* Which indices are used. NULL means all are used */ + int recnoChng, /* True if the record number will change */ + int isUpdate, /* True for UPDATE, False for INSERT */ + int overrideError, /* Override onError to this if not OE_Default */ + int ignoreDest /* Jump to this label on an OE_Ignore resolution */ +){ + int i; + Vdbe *v; + int nCol; + int onError; + int addr; + int extra; + int iCur; + Index *pIdx; + int seenReplace = 0; + int jumpInst1=0, jumpInst2; + int contAddr; + int hasTwoRecnos = (isUpdate && recnoChng); + + v = sqlite3GetVdbe(pParse); + assert( v!=0 ); + assert( pTab->pSelect==0 ); /* This table is not a VIEW */ + nCol = pTab->nCol; + + /* Test all NOT NULL constraints. + */ + for(i=0; i<nCol; i++){ + if( i==pTab->iPKey ){ + continue; + } + onError = pTab->aCol[i].notNull; + if( onError==OE_None ) continue; + if( overrideError!=OE_Default ){ + onError = overrideError; + }else if( onError==OE_Default ){ + onError = OE_Abort; + } + if( onError==OE_Replace && pTab->aCol[i].zDflt==0 ){ + onError = OE_Abort; + } + sqlite3VdbeAddOp(v, OP_Dup, nCol-1-i, 1); + addr = sqlite3VdbeAddOp(v, OP_NotNull, 1, 0); + switch( onError ){ + case OE_Rollback: + case OE_Abort: + case OE_Fail: { + char *zMsg = 0; + sqlite3VdbeAddOp(v, OP_Halt, SQLITE_CONSTRAINT, onError); + sqlite3SetString(&zMsg, pTab->zName, ".", pTab->aCol[i].zName, + " may not be NULL", (char*)0); + sqlite3VdbeChangeP3(v, -1, zMsg, P3_DYNAMIC); + break; + } + case OE_Ignore: { + sqlite3VdbeAddOp(v, OP_Pop, nCol+1+hasTwoRecnos, 0); + sqlite3VdbeAddOp(v, OP_Goto, 0, ignoreDest); + break; + } + case OE_Replace: { + sqlite3VdbeOp3(v, OP_String8, 0, 0, pTab->aCol[i].zDflt, P3_STATIC); + sqlite3VdbeAddOp(v, OP_Push, nCol-i, 0); + break; + } + default: assert(0); + } + sqlite3VdbeChangeP2(v, addr, sqlite3VdbeCurrentAddr(v)); + } + + /* Test all CHECK constraints + */ + /**** TBD ****/ + + /* If we have an INTEGER PRIMARY KEY, make sure the primary key + ** of the new record does not previously exist. Except, if this + ** is an UPDATE and the primary key is not changing, that is OK. + */ + if( recnoChng ){ + onError = pTab->keyConf; + if( overrideError!=OE_Default ){ + onError = overrideError; + }else if( onError==OE_Default ){ + onError = OE_Abort; + } + + if( isUpdate ){ + sqlite3VdbeAddOp(v, OP_Dup, nCol+1, 1); + sqlite3VdbeAddOp(v, OP_Dup, nCol+1, 1); + jumpInst1 = sqlite3VdbeAddOp(v, OP_Eq, 0, 0); + } + sqlite3VdbeAddOp(v, OP_Dup, nCol, 1); + jumpInst2 = sqlite3VdbeAddOp(v, OP_NotExists, base, 0); + switch( onError ){ + default: { + onError = OE_Abort; + /* Fall thru into the next case */ + } + case OE_Rollback: + case OE_Abort: + case OE_Fail: { + sqlite3VdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, onError, + "PRIMARY KEY must be unique", P3_STATIC); + break; + } + case OE_Replace: { + sqlite3GenerateRowIndexDelete(pParse->db, v, pTab, base, 0); + if( isUpdate ){ + sqlite3VdbeAddOp(v, OP_Dup, nCol+hasTwoRecnos, 1); + sqlite3VdbeAddOp(v, OP_MoveGe, base, 0); + } + seenReplace = 1; + break; + } + case OE_Ignore: { + assert( seenReplace==0 ); + sqlite3VdbeAddOp(v, OP_Pop, nCol+1+hasTwoRecnos, 0); + sqlite3VdbeAddOp(v, OP_Goto, 0, ignoreDest); + break; + } + } + contAddr = sqlite3VdbeCurrentAddr(v); + sqlite3VdbeChangeP2(v, jumpInst2, contAddr); + if( isUpdate ){ + sqlite3VdbeChangeP2(v, jumpInst1, contAddr); + sqlite3VdbeAddOp(v, OP_Dup, nCol+1, 1); + sqlite3VdbeAddOp(v, OP_MoveGe, base, 0); + } + } + + /* Test all UNIQUE constraints by creating entries for each UNIQUE + ** index and making sure that duplicate entries do not already exist. + ** Add the new records to the indices as we go. + */ + extra = -1; + for(iCur=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, iCur++){ + if( aIdxUsed && aIdxUsed[iCur]==0 ) continue; /* Skip unused indices */ + extra++; + + /* Create a key for accessing the index entry */ + sqlite3VdbeAddOp(v, OP_Dup, nCol+extra, 1); + for(i=0; i<pIdx->nColumn; i++){ + int idx = pIdx->aiColumn[i]; + if( idx==pTab->iPKey ){ + sqlite3VdbeAddOp(v, OP_Dup, i+extra+nCol+1, 1); + }else{ + sqlite3VdbeAddOp(v, OP_Dup, i+extra+nCol-idx, 1); + } + } + jumpInst1 = sqlite3VdbeAddOp(v, OP_MakeRecord, pIdx->nColumn, (1<<24)); + sqlite3IndexAffinityStr(v, pIdx); + + /* Find out what action to take in case there is an indexing conflict */ + onError = pIdx->onError; + if( onError==OE_None ) continue; /* pIdx is not a UNIQUE index */ + if( overrideError!=OE_Default ){ + onError = overrideError; + }else if( onError==OE_Default ){ + onError = OE_Abort; + } + if( seenReplace ){ + if( onError==OE_Ignore ) onError = OE_Replace; + else if( onError==OE_Fail ) onError = OE_Abort; + } + + + /* Check to see if the new index entry will be unique */ + sqlite3VdbeAddOp(v, OP_Dup, extra+nCol+1+hasTwoRecnos, 1); + jumpInst2 = sqlite3VdbeAddOp(v, OP_IsUnique, base+iCur+1, 0); + + /* Generate code that executes if the new index entry is not unique */ + switch( onError ){ + case OE_Rollback: + case OE_Abort: + case OE_Fail: { + int j, n1, n2; + char zErrMsg[200]; + strcpy(zErrMsg, pIdx->nColumn>1 ? "columns " : "column "); + n1 = strlen(zErrMsg); + for(j=0; j<pIdx->nColumn && n1<sizeof(zErrMsg)-30; j++){ + char *zCol = pTab->aCol[pIdx->aiColumn[j]].zName; + n2 = strlen(zCol); + if( j>0 ){ + strcpy(&zErrMsg[n1], ", "); + n1 += 2; + } + if( n1+n2>sizeof(zErrMsg)-30 ){ + strcpy(&zErrMsg[n1], "..."); + n1 += 3; + break; + }else{ + strcpy(&zErrMsg[n1], zCol); + n1 += n2; + } + } + strcpy(&zErrMsg[n1], + pIdx->nColumn>1 ? " are not unique" : " is not unique"); + sqlite3VdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, onError, zErrMsg, 0); + break; + } + case OE_Ignore: { + assert( seenReplace==0 ); + sqlite3VdbeAddOp(v, OP_Pop, nCol+extra+3+hasTwoRecnos, 0); + sqlite3VdbeAddOp(v, OP_Goto, 0, ignoreDest); + break; + } + case OE_Replace: { + sqlite3GenerateRowDelete(pParse->db, v, pTab, base, 0); + if( isUpdate ){ + sqlite3VdbeAddOp(v, OP_Dup, nCol+extra+1+hasTwoRecnos, 1); + sqlite3VdbeAddOp(v, OP_MoveGe, base, 0); + } + seenReplace = 1; + break; + } + default: assert(0); + } + contAddr = sqlite3VdbeCurrentAddr(v); + assert( contAddr<(1<<24) ); +#if NULL_DISTINCT_FOR_UNIQUE + sqlite3VdbeChangeP2(v, jumpInst1, contAddr | (1<<24)); +#endif + sqlite3VdbeChangeP2(v, jumpInst2, contAddr); + } +} + +/* +** This routine generates code to finish the INSERT or UPDATE operation +** that was started by a prior call to sqlite3GenerateConstraintChecks. +** The stack must contain keys for all active indices followed by data +** and the recno for the new entry. This routine creates the new +** entries in all indices and in the main table. +** +** The arguments to this routine should be the same as the first six +** arguments to sqlite3GenerateConstraintChecks. +*/ +void sqlite3CompleteInsertion( + Parse *pParse, /* The parser context */ + Table *pTab, /* the table into which we are inserting */ + int base, /* Index of a read/write cursor pointing at pTab */ + char *aIdxUsed, /* Which indices are used. NULL means all are used */ + int recnoChng, /* True if the record number will change */ + int isUpdate, /* True for UPDATE, False for INSERT */ + int newIdx /* Index of NEW table for triggers. -1 if none */ +){ + int i; + Vdbe *v; + int nIdx; + Index *pIdx; + int pik_flags; + + v = sqlite3GetVdbe(pParse); + assert( v!=0 ); + assert( pTab->pSelect==0 ); /* This table is not a VIEW */ + for(nIdx=0, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, nIdx++){} + for(i=nIdx-1; i>=0; i--){ + if( aIdxUsed && aIdxUsed[i]==0 ) continue; + sqlite3VdbeAddOp(v, OP_IdxPut, base+i+1, 0); + } + sqlite3VdbeAddOp(v, OP_MakeRecord, pTab->nCol, 0); + sqlite3TableAffinityStr(v, pTab); + if( newIdx>=0 ){ + sqlite3VdbeAddOp(v, OP_Dup, 1, 0); + sqlite3VdbeAddOp(v, OP_Dup, 1, 0); + sqlite3VdbeAddOp(v, OP_PutIntKey, newIdx, 0); + } + pik_flags = (OPFLAG_NCHANGE|(isUpdate?0:OPFLAG_LASTROWID)); + sqlite3VdbeAddOp(v, OP_PutIntKey, base, pik_flags); + + if( isUpdate && recnoChng ){ + sqlite3VdbeAddOp(v, OP_Pop, 1, 0); + } +} + +/* +** Generate code that will open cursors for a table and for all +** indices of that table. The "base" parameter is the cursor number used +** for the table. Indices are opened on subsequent cursors. +*/ +void sqlite3OpenTableAndIndices( + Parse *pParse, /* Parsing context */ + Table *pTab, /* Table to be opened */ + int base, /* Cursor number assigned to the table */ + int op /* OP_OpenRead or OP_OpenWrite */ +){ + int i; + Index *pIdx; + Vdbe *v = sqlite3GetVdbe(pParse); + assert( v!=0 ); + sqlite3VdbeAddOp(v, OP_Integer, pTab->iDb, 0); + sqlite3VdbeAddOp(v, op, base, pTab->tnum); + VdbeComment((v, "# %s", pTab->zName)); + sqlite3VdbeAddOp(v, OP_SetNumColumns, base, pTab->nCol); + for(i=1, pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext, i++){ + sqlite3VdbeAddOp(v, OP_Integer, pIdx->iDb, 0); + sqlite3VdbeOp3(v, op, i+base, pIdx->tnum, + (char*)&pIdx->keyInfo, P3_KEYINFO); + } + if( pParse->nTab<=base+i ){ + pParse->nTab = base+i; + } +} |