/**************************************************************************** ** ** Implementation of QSqlQuery class ** ** Created : 2000-11-03 ** ** Copyright (C) 2000-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the sql module of the Qt GUI Toolkit. ** ** This file may be used under the terms of the GNU General ** Public License versions 2.0 or 3.0 as published by the Free ** Software Foundation and appearing in the files LICENSE.GPL2 ** and LICENSE.GPL3 included in the packaging of this file. ** Alternatively you may (at your option) use any later version ** of the GNU General Public License if such license has been ** publicly approved by Trolltech ASA (or its successors, if any) ** and the KDE Free Qt Foundation. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** This file may be used under the terms of the Q Public License as ** defined by Trolltech ASA and appearing in the file LICENSE.QPL ** included in the packaging of this file. Licensees holding valid Qt ** Commercial licenses may use this file in accordance with the Qt ** Commercial License Agreement provided with the Software. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted ** herein. ** **********************************************************************/ #include "qsqlquery.h" #ifndef QT_NO_SQL //#define QT_DEBUG_SQL #include "qsqlresult.h" #include "qsqldriver.h" #include "qsqldatabase.h" #include "qsql.h" #include "qregexp.h" #include "private/qsqlextension_p.h" /*! \internal */ QSqlResultShared::QSqlResultShared( QSqlResult* result ): sqlResult(result) { if ( result ) connect( result->driver(), SIGNAL(destroyed()), this, SLOT(slotResultDestroyed()) ); } /*! \internal */ QSqlResultShared::~QSqlResultShared() { delete sqlResult; } /*! \internal In case a plugin gets unloaded the pointer to the sqlResult gets invalid */ void QSqlResultShared::slotResultDestroyed() { delete sqlResult; sqlResult = 0; } /*! \class QSqlQuery qsqlquery.h \brief The QSqlQuery class provides a means of executing and manipulating SQL statements. \ingroup database \mainclass \module sql QSqlQuery encapsulates the functionality involved in creating, navigating and retrieving data from SQL queries which are executed on a \l QSqlDatabase. It can be used to execute DML (data manipulation language) statements, e.g. \c SELECT, \c INSERT, \c UPDATE and \c DELETE, and also DDL (data definition language) statements, e.g. \c{CREATE TABLE}. It can also be used to execute database-specific commands which are not standard SQL (e.g. \c{SET DATESTYLE=ISO} for PostgreSQL). Successfully executed SQL statements set the query's state to active (isActive() returns TRUE); otherwise the query's state is set to inactive. In either case, when executing a new SQL statement, the query is positioned on an invalid record; an active query must be navigated to a valid record (so that isValid() returns TRUE) before values can be retrieved. Navigating records is performed with the following functions: \list \i \c next() \i \c prev() \i \c first() \i \c last() \i \c \link QSqlQuery::seek() seek\endlink(int) \endlist These functions allow the programmer to move forward, backward or arbitrarily through the records returned by the query. If you only need to move forward through the results, e.g. using next() or using seek() with a positive offset, you can use setForwardOnly() and save a significant amount of memory overhead. Once an active query is positioned on a valid record, data can be retrieved using value(). All data is transferred from the SQL backend using QVariants. For example: \code QSqlQuery query( "SELECT name FROM customer" ); while ( query.next() ) { QString name = query.value(0).toString(); doSomething( name ); } \endcode To access the data returned by a query, use the value() method. Each field in the data returned by a SELECT statement is accessed by passing the field's position in the statement, starting from 0. Information about the fields can be obtained via QSqlDatabase::record(). For the sake of efficiency there are no functions to access a field by name. (The \l QSqlCursor class provides a higher-level interface with field access by name and automatic SQL generation.) QSqlQuery supports prepared query execution and the binding of parameter values to placeholders. Some databases don't support these features, so for them Qt emulates the required functionality. For example, the Oracle and ODBC drivers have proper prepared query support, and Qt makes use of it; but for databases that don't have this support, Qt implements the feature itself, e.g. by replacing placeholders with actual values when a query is executed. The exception is positional binding using named placeholders, which requires that the database supports prepared queries. Oracle databases identify placeholders by using a colon-name syntax, e.g \c{:name}. ODBC simply uses \c ? characters. Qt supports both syntaxes (although you can't mix them in the same query). Below we present the same example using each of the four different binding approaches. <b>Named binding using named placeholders</b> \code QSqlQuery query; query.prepare( "INSERT INTO atable (id, forename, surname) " "VALUES (:id, :forename, :surname)" ); query.bindValue( ":id", 1001 ); query.bindValue( ":forename", "Bart" ); query.bindValue( ":surname", "Simpson" ); query.exec(); \endcode <b>Positional binding using named placeholders</b> \code QSqlQuery query; query.prepare( "INSERT INTO atable (id, forename, surname) " "VALUES (:id, :forename, :surname)" ); query.bindValue( 0, 1001 ); query.bindValue( 1, "Bart" ); query.bindValue( 2, "Simpson" ); query.exec(); \endcode <b>Note:</b> Using positional binding with named placeholders will only work if the database supports prepared queries. This can be checked with QSqlDriver::hasFeature() using QSqlDriver::PreparedQueries as argument for driver feature. <b>Binding values using positional placeholders #1</b> \code QSqlQuery query; query.prepare( "INSERT INTO atable (id, forename, surname) " "VALUES (?, ?, ?)" ); query.bindValue( 0, 1001 ); query.bindValue( 1, "Bart" ); query.bindValue( 2, "Simpson" ); query.exec(); \endcode <b>Binding values using positional placeholders #2</b> \code query.prepare( "INSERT INTO atable (id, forename, surname) " "VALUES (?, ?, ?)" ); query.addBindValue( 1001 ); query.addBindValue( "Bart" ); query.addBindValue( "Simpson" ); query.exec(); \endcode <b>Binding values to a stored procedure</b> This code calls a stored procedure called \c AsciiToInt(), passing it a character through its in parameter, and taking its result in the out parameter. \code QSqlQuery query; query.prepare( "call AsciiToInt(?, ?)" ); query.bindValue( 0, "A" ); query.bindValue( 1, 0, QSql::Out ); query.exec(); int i = query.boundValue( 1 ).toInt(); // i is 65. \endcode \sa QSqlDatabase QSqlCursor QVariant */ /*! Creates a QSqlQuery object which uses the QSqlResult \a r to communicate with a database. */ QSqlQuery::QSqlQuery( QSqlResult * r ) { d = new QSqlResultShared( r ); } /*! Destroys the object and frees any allocated resources. */ QSqlQuery::~QSqlQuery() { if (d->deref()) { delete d; } } /*! Constructs a copy of \a other. */ QSqlQuery::QSqlQuery( const QSqlQuery& other ) : d(other.d) { d->ref(); } /*! Creates a QSqlQuery object using the SQL \a query and the database \a db. If \a db is 0, (the default), the application's default database is used. If \a query is not a null string, it will be executed. \sa QSqlDatabase */ QSqlQuery::QSqlQuery( const QString& query, QSqlDatabase* db ) { init( query, db ); } /*! Creates a QSqlQuery object using the database \a db. If \a db is 0, the application's default database is used. \sa QSqlDatabase */ QSqlQuery::QSqlQuery( QSqlDatabase* db ) { init( QString::null, db ); } /*! \internal */ void QSqlQuery::init( const QString& query, QSqlDatabase* db ) { d = new QSqlResultShared( 0 ); QSqlDatabase* database = db; if ( !database ) database = QSqlDatabase::database( QSqlDatabase::defaultConnection, FALSE ); if ( database ) *this = database->driver()->createQuery(); if ( !query.isNull() ) exec( query ); } /*! Assigns \a other to the query. */ QSqlQuery& QSqlQuery::operator=( const QSqlQuery& other ) { other.d->ref(); deref(); d = other.d; return *this; } /*! Returns TRUE if the query is active and positioned on a valid record and the \a field is NULL; otherwise returns FALSE. Note that for some drivers isNull() will not return accurate information until after an attempt is made to retrieve data. \sa isActive() isValid() value() */ bool QSqlQuery::isNull( int field ) const { if ( !d->sqlResult ) return FALSE; if ( d->sqlResult->isActive() && d->sqlResult->isValid() ) return d->sqlResult->isNull( field ); return FALSE; } /*! Executes the SQL in \a query. Returns TRUE and sets the query state to active if the query was successful; otherwise returns FALSE and sets the query state to inactive. The \a query string must use syntax appropriate for the SQL database being queried, for example, standard SQL. After the query is executed, the query is positioned on an \e invalid record, and must be navigated to a valid record before data values can be retrieved, e.g. using next(). Note that the last error for this query is reset when exec() is called. \sa isActive() isValid() next() prev() first() last() seek() */ bool QSqlQuery::exec ( const QString& query ) { if ( !d->sqlResult ) return FALSE; if ( d->sqlResult->extension() && driver()->hasFeature( QSqlDriver::PreparedQueries ) ) d->sqlResult->extension()->clear(); d->sqlResult->setActive( FALSE ); d->sqlResult->setLastError( QSqlError() ); d->sqlResult->setAt( QSql::BeforeFirst ); if ( !driver() ) { #ifdef QT_CHECK_RANGE qWarning("QSqlQuery::exec: no driver" ); #endif return FALSE; } if ( d->count > 1 ) *this = driver()->createQuery(); d->sqlResult->setQuery( query.stripWhiteSpace() ); d->executedQuery = d->sqlResult->lastQuery(); if ( !driver()->isOpen() || driver()->isOpenError() ) { #ifdef QT_CHECK_RANGE qWarning("QSqlQuery::exec: database not open" ); #endif return FALSE; } if ( query.isNull() || query.length() == 0 ) { #ifdef QT_CHECK_RANGE qWarning("QSqlQuery::exec: empty query" ); #endif return FALSE; } #ifdef QT_DEBUG_SQL qDebug( "\n QSqlQuery: " + query ); #endif return d->sqlResult->reset( query ); } /*! Returns the value of the \a{i}-th field in the query (zero based). The fields are numbered from left to right using the text of the \c SELECT statement, e.g. in \c{SELECT forename, surname FROM people}, field 0 is \c forename and field 1 is \c surname. Using \c{SELECT *} is not recommended because the order of the fields in the query is undefined. An invalid QVariant is returned if field \a i does not exist, if the query is inactive, or if the query is positioned on an invalid record. \sa prev() next() first() last() seek() isActive() isValid() */ QVariant QSqlQuery::value( int i ) const { if ( !d->sqlResult ) return QVariant(); if ( isActive() && isValid() && ( i > QSql::BeforeFirst ) ) { return d->sqlResult->data( i ); } else { #ifdef QT_CHECK_RANGE qWarning( "QSqlQuery::value: not positioned on a valid record" ); #endif } return QVariant(); } /*! Returns the current internal position of the query. The first record is at position zero. If the position is invalid, a QSql::Location will be returned indicating the invalid position. \sa prev() next() first() last() seek() isActive() isValid() */ int QSqlQuery::at() const { if ( !d->sqlResult ) return QSql::BeforeFirst; return d->sqlResult->at(); } /*! Returns the text of the current query being used, or QString::null if there is no current query text. \sa executedQuery() */ QString QSqlQuery::lastQuery() const { if ( !d->sqlResult ) return QString::null; return d->sqlResult->lastQuery(); } /*! Returns the database driver associated with the query. */ const QSqlDriver* QSqlQuery::driver() const { if ( !d->sqlResult ) return 0; return d->sqlResult->driver(); } /*! Returns the result associated with the query. */ const QSqlResult* QSqlQuery::result() const { return d->sqlResult; } /*! Retrieves the record at position (offset) \a i, if available, and positions the query on the retrieved record. The first record is at position 0. Note that the query must be in an active state and isSelect() must return TRUE before calling this function. If \a relative is FALSE (the default), the following rules apply: \list \i If \a i is negative, the result is positioned before the first record and FALSE is returned. \i Otherwise, an attempt is made to move to the record at position \a i. If the record at position \a i could not be retrieved, the result is positioned after the last record and FALSE is returned. If the record is successfully retrieved, TRUE is returned. \endlist If \a relative is TRUE, the following rules apply: \list \i If the result is currently positioned before the first record or on the first record, and \a i is negative, there is no change, and FALSE is returned. \i If the result is currently located after the last record, and \a i is positive, there is no change, and FALSE is returned. \i If the result is currently located somewhere in the middle, and the relative offset \a i moves the result below zero, the result is positioned before the first record and FALSE is returned. \i Otherwise, an attempt is made to move to the record \a i records ahead of the current record (or \a i records behind the current record if \a i is negative). If the record at offset \a i could not be retrieved, the result is positioned after the last record if \a i >= 0, (or before the first record if \a i is negative), and FALSE is returned. If the record is successfully retrieved, TRUE is returned. \endlist \sa next() prev() first() last() at() isActive() isValid() */ bool QSqlQuery::seek( int i, bool relative ) { if ( !isSelect() || !isActive() ) return FALSE; beforeSeek(); checkDetach(); int actualIdx; if ( !relative ) { // arbitrary seek if ( i < 0 ) { d->sqlResult->setAt( QSql::BeforeFirst ); afterSeek(); return FALSE; } actualIdx = i; } else { switch ( at() ) { // relative seek case QSql::BeforeFirst: if ( i > 0 ) actualIdx = i; else { afterSeek(); return FALSE; } break; case QSql::AfterLast: if ( i < 0 ) { d->sqlResult->fetchLast(); actualIdx = at() + i; } else { afterSeek(); return FALSE; } break; default: if ( ( at() + i ) < 0 ) { d->sqlResult->setAt( QSql::BeforeFirst ); afterSeek(); return FALSE; } actualIdx = at() + i; break; } } // let drivers optimize if ( isForwardOnly() && actualIdx < at() ) { #ifdef QT_CHECK_RANGE qWarning("QSqlQuery::seek: cannot seek backwards in a forward only query" ); #endif afterSeek(); return FALSE; } if ( actualIdx == ( at() + 1 ) && at() != QSql::BeforeFirst ) { if ( !d->sqlResult->fetchNext() ) { d->sqlResult->setAt( QSql::AfterLast ); afterSeek(); return FALSE; } afterSeek(); return TRUE; } if ( actualIdx == ( at() - 1 ) ) { if ( !d->sqlResult->fetchPrev() ) { d->sqlResult->setAt( QSql::BeforeFirst ); afterSeek(); return FALSE; } afterSeek(); return TRUE; } if ( !d->sqlResult->fetch( actualIdx ) ) { d->sqlResult->setAt( QSql::AfterLast ); afterSeek(); return FALSE; } afterSeek(); return TRUE; } /*! Retrieves the next record in the result, if available, and positions the query on the retrieved record. Note that the result must be in an active state and isSelect() must return TRUE before calling this function or it will do nothing and return FALSE. The following rules apply: \list \i If the result is currently located before the first record, e.g. immediately after a query is executed, an attempt is made to retrieve the first record. \i If the result is currently located after the last record, there is no change and FALSE is returned. \i If the result is located somewhere in the middle, an attempt is made to retrieve the next record. \endlist If the record could not be retrieved, the result is positioned after the last record and FALSE is returned. If the record is successfully retrieved, TRUE is returned. \sa prev() first() last() seek() at() isActive() isValid() */ bool QSqlQuery::next() { if ( !isSelect() || !isActive() ) return FALSE; beforeSeek(); checkDetach(); bool b = FALSE; switch ( at() ) { case QSql::BeforeFirst: b = d->sqlResult->fetchFirst(); afterSeek(); return b; case QSql::AfterLast: afterSeek(); return FALSE; default: if ( !d->sqlResult->fetchNext() ) { d->sqlResult->setAt( QSql::AfterLast ); afterSeek(); return FALSE; } afterSeek(); return TRUE; } } /*! Retrieves the previous record in the result, if available, and positions the query on the retrieved record. Note that the result must be in an active state and isSelect() must return TRUE before calling this function or it will do nothing and return FALSE. The following rules apply: \list \i If the result is currently located before the first record, there is no change and FALSE is returned. \i If the result is currently located after the last record, an attempt is made to retrieve the last record. \i If the result is somewhere in the middle, an attempt is made to retrieve the previous record. \endlist If the record could not be retrieved, the result is positioned before the first record and FALSE is returned. If the record is successfully retrieved, TRUE is returned. \sa next() first() last() seek() at() isActive() isValid() */ bool QSqlQuery::prev() { if ( !isSelect() || !isActive() ) return FALSE; if ( isForwardOnly() ) { #ifdef QT_CHECK_RANGE qWarning("QSqlQuery::seek: cannot seek backwards in a forward only query" ); #endif return FALSE; } beforeSeek(); checkDetach(); bool b = FALSE; switch ( at() ) { case QSql::BeforeFirst: afterSeek(); return FALSE; case QSql::AfterLast: b = d->sqlResult->fetchLast(); afterSeek(); return b; default: if ( !d->sqlResult->fetchPrev() ) { d->sqlResult->setAt( QSql::BeforeFirst ); afterSeek(); return FALSE; } afterSeek(); return TRUE; } } /*! Retrieves the first record in the result, if available, and positions the query on the retrieved record. Note that the result must be in an active state and isSelect() must return TRUE before calling this function or it will do nothing and return FALSE. Returns TRUE if successful. If unsuccessful the query position is set to an invalid position and FALSE is returned. \sa next() prev() last() seek() at() isActive() isValid() */ bool QSqlQuery::first() { if ( !isSelect() || !isActive() ) return FALSE; if ( isForwardOnly() && at() > QSql::BeforeFirst ) { #ifdef QT_CHECK_RANGE qWarning("QSqlQuery::seek: cannot seek backwards in a forward only query" ); #endif return FALSE; } beforeSeek(); checkDetach(); bool b = FALSE; b = d->sqlResult->fetchFirst(); afterSeek(); return b; } /*! Retrieves the last record in the result, if available, and positions the query on the retrieved record. Note that the result must be in an active state and isSelect() must return TRUE before calling this function or it will do nothing and return FALSE. Returns TRUE if successful. If unsuccessful the query position is set to an invalid position and FALSE is returned. \sa next() prev() first() seek() at() isActive() isValid() */ bool QSqlQuery::last() { if ( !isSelect() || !isActive() ) return FALSE; beforeSeek(); checkDetach(); bool b = FALSE; b = d->sqlResult->fetchLast(); afterSeek(); return b; } /*! Returns the size of the result, (number of rows returned), or -1 if the size cannot be determined or if the database does not support reporting information about query sizes. Note that for non-\c SELECT statements (isSelect() returns FALSE), size() will return -1. If the query is not active (isActive() returns FALSE), -1 is returned. To determine the number of rows affected by a non-SELECT statement, use numRowsAffected(). \sa isActive() numRowsAffected() QSqlDriver::hasFeature() */ int QSqlQuery::size() const { if ( !d->sqlResult ) return -1; if ( isActive() && d->sqlResult->driver()->hasFeature( QSqlDriver::QuerySize ) ) return d->sqlResult->size(); return -1; } /*! Returns the number of rows affected by the result's SQL statement, or -1 if it cannot be determined. Note that for \c SELECT statements, the value is undefined; see size() instead. If the query is not active (isActive() returns FALSE), -1 is returned. \sa size() QSqlDriver::hasFeature() */ int QSqlQuery::numRowsAffected() const { if ( !d->sqlResult ) return -1; if ( isActive() ) return d->sqlResult->numRowsAffected(); return -1; } /*! Returns error information about the last error (if any) that occurred. \sa QSqlError */ QSqlError QSqlQuery::lastError() const { if ( !d->sqlResult ) return QSqlError(); return d->sqlResult->lastError(); } /*! Returns TRUE if the query is currently positioned on a valid record; otherwise returns FALSE. */ bool QSqlQuery::isValid() const { if ( !d->sqlResult ) return FALSE; return d->sqlResult->isValid(); } /*! Returns TRUE if the query is currently active; otherwise returns FALSE. */ bool QSqlQuery::isActive() const { if ( !d->sqlResult ) return FALSE; return d->sqlResult->isActive(); } /*! Returns TRUE if the current query is a \c SELECT statement; otherwise returns FALSE. */ bool QSqlQuery::isSelect() const { if ( !d->sqlResult ) return FALSE; return d->sqlResult->isSelect(); } /*! Returns TRUE if you can only scroll \e forward through a result set; otherwise returns FALSE. \sa setForwardOnly() */ bool QSqlQuery::isForwardOnly() const { if ( !d->sqlResult ) return FALSE; return d->sqlResult->isForwardOnly(); } /*! Sets forward only mode to \a forward. If forward is TRUE only next(), and seek() with positive values, are allowed for navigating the results. Forward only mode needs far less memory since results do not need to be cached. Forward only mode is off by default. Forward only mode cannot be used with data aware widgets like QDataTable, since they must to be able to scroll backward as well as forward. \sa isForwardOnly(), next(), seek() */ void QSqlQuery::setForwardOnly( bool forward ) { if ( d->sqlResult ) d->sqlResult->setForwardOnly( forward ); } /*! \internal */ void QSqlQuery::deref() { if ( d->deref() ) { delete d; d = 0; } } /*! \internal */ bool QSqlQuery::checkDetach() { if ( d->count > 1 && d->sqlResult ) { QString sql = d->sqlResult->lastQuery(); *this = driver()->createQuery(); exec( sql ); return TRUE; } return FALSE; } /*! Protected virtual function called before the internal record pointer is moved to a new record. The default implementation does nothing. */ void QSqlQuery::beforeSeek() { } /*! Protected virtual function called after the internal record pointer is moved to a new record. The default implementation does nothing. */ void QSqlQuery::afterSeek() { } // XXX: Hack to keep BCI - remove in 4.0. QSqlExtension should be // removed, and the prepare(), exec() etc. fu's should be // made virtual members of QSqlQuery/QSqlResult /*! Prepares the SQL query \a query for execution. The query may contain placeholders for binding values. Both Oracle style colon-name (e.g. \c{:surname}), and ODBC style (e.g. \c{?}) placeholders are supported; but they cannot be mixed in the same query. See the \link #details Description\endlink for examples. \sa exec(), bindValue(), addBindValue() */ bool QSqlQuery::prepare( const QString& query ) { if ( !d->sqlResult || !d->sqlResult->extension() ) return FALSE; d->sqlResult->setActive( FALSE ); d->sqlResult->setLastError( QSqlError() ); d->sqlResult->setAt( QSql::BeforeFirst ); d->sqlResult->extension()->clear(); if ( !driver() ) { #ifdef QT_CHECK_RANGE qWarning("QSqlQuery::prepare: no driver" ); #endif return FALSE; } if ( d->count > 1 ) *this = driver()->createQuery(); d->sqlResult->setQuery( query.stripWhiteSpace() ); if ( !driver()->isOpen() || driver()->isOpenError() ) { #ifdef QT_CHECK_RANGE qWarning("QSqlQuery::prepare: database not open" ); #endif return FALSE; } if ( query.isNull() || query.length() == 0 ) { #ifdef QT_CHECK_RANGE qWarning("QSqlQuery::prepare: empty query" ); #endif return FALSE; } #ifdef QT_DEBUG_SQL qDebug( "\n QSqlQuery: " + query ); #endif QString q = query; QRegExp rx(QString::fromLatin1("'[^']*'|:([a-zA-Z0-9_]+)")); if ( driver()->hasFeature( QSqlDriver::PreparedQueries ) ) { // below we substitute Oracle placeholders with ODBC ones and // vice versa to make this db independent int i = 0, cnt = 0; if ( driver()->hasFeature( QSqlDriver::NamedPlaceholders ) ) { QRegExp rx(QString::fromLatin1("'[^']*'|\\?")); while ( (i = rx.search( q, i )) != -1 ) { if ( rx.cap(0) == "?" ) { q = q.replace( i, 1, ":f" + QString::number(cnt) ); cnt++; } i += rx.matchedLength(); } } else if ( driver()->hasFeature( QSqlDriver::PositionalPlaceholders ) ) { while ( (i = rx.search( q, i )) != -1 ) { if ( rx.cap(1).isEmpty() ) { i += rx.matchedLength(); } else { // record the index of the placeholder - needed // for emulating named bindings with ODBC d->sqlResult->extension()->index[ cnt ]= rx.cap(0); q = q.replace( i, rx.matchedLength(), "?" ); i++; cnt++; } } } d->executedQuery = q; return d->sqlResult->extension()->prepare( q ); } else { int i = 0; while ( (i = rx.search( q, i )) != -1 ) { if ( !rx.cap(1).isEmpty() ) d->sqlResult->extension()->holders.append( Holder( rx.cap(0), i ) ); i += rx.matchedLength(); } return TRUE; // fake prepares should always succeed } } /*! \overload Executes a previously prepared SQL query. Returns TRUE if the query executed successfully; otherwise returns FALSE. \sa prepare(), bindValue(), addBindValue() */ bool QSqlQuery::exec() { bool ret; if ( !d->sqlResult || !d->sqlResult->extension() ) return FALSE; if ( driver()->hasFeature( QSqlDriver::PreparedQueries ) ) { ret = d->sqlResult->extension()->exec(); } else { // fake preparation - just replace the placeholders.. QString query = d->sqlResult->lastQuery(); if ( d->sqlResult->extension()->bindMethod() == QSqlExtension::BindByName ) { int i; QVariant val; QString holder; for ( i = (int)d->sqlResult->extension()->holders.count() - 1; i >= 0; --i ) { holder = d->sqlResult->extension()->holders[ (uint)i ].holderName; val = d->sqlResult->extension()->values[ holder ].value; QSqlField f( "", val.type() ); if ( val.isNull() ) f.setNull(); else f.setValue( val ); query = query.replace( (uint)d->sqlResult->extension()->holders[ (uint)i ].holderPos, holder.length(), driver()->formatValue( &f ) ); } } else { QMap<int, QString>::ConstIterator it; QString val; int i = 0; for ( it = d->sqlResult->extension()->index.begin(); it != d->sqlResult->extension()->index.end(); ++it ) { i = query.find( '?', i ); if ( i > -1 ) { QSqlField f( "", d->sqlResult->extension()->values[ it.data() ].value.type() ); if ( d->sqlResult->extension()->values[ it.data() ].value.isNull() ) f.setNull(); else f.setValue( d->sqlResult->extension()->values[ it.data() ].value ); val = driver()->formatValue( &f ); query = query.replace( i, 1, driver()->formatValue( &f ) ); i += val.length(); } } } // have to retain the original query w/placeholders.. QString orig = d->sqlResult->lastQuery(); ret = exec( query ); d->executedQuery = query; d->sqlResult->setQuery( orig ); } d->sqlResult->extension()->resetBindCount(); return ret; } /*! Set the placeholder \a placeholder to be bound to value \a val in the prepared statement. Note that the placeholder mark (e.g \c{:}) must be included when specifying the placeholder name. If \a type is \c QSql::Out or \c QSql::InOut, the placeholder will be overwritten with data from the database after the exec() call. \sa addBindValue(), prepare(), exec() */ void QSqlQuery::bindValue( const QString& placeholder, const QVariant& val, QSql::ParameterType type ) { if ( !d->sqlResult || !d->sqlResult->extension() ) return; d->sqlResult->extension()->bindValue( placeholder, val, type ); } /*! \overload Set the placeholder in position \a pos to be bound to value \a val in the prepared statement. Field numbering starts at 0. If \a type is \c QSql::Out or \c QSql::InOut, the placeholder will be overwritten with data from the database after the exec() call. \sa addBindValue(), prepare(), exec() */ void QSqlQuery::bindValue( int pos, const QVariant& val, QSql::ParameterType type ) { if ( !d->sqlResult || !d->sqlResult->extension() ) return; d->sqlResult->extension()->bindValue( pos, val, type ); } /*! Adds the value \a val to the list of values when using positional value binding. The order of the addBindValue() calls determines which placeholder a value will be bound to in the prepared query. If \a type is \c QSql::Out or \c QSql::InOut, the placeholder will be overwritten with data from the database after the exec() call. \sa bindValue(), prepare(), exec() */ void QSqlQuery::addBindValue( const QVariant& val, QSql::ParameterType type ) { if ( !d->sqlResult || !d->sqlResult->extension() ) return; d->sqlResult->extension()->addBindValue( val, type ); } /*! \overload Binds the placeholder with type \c QSql::In. */ void QSqlQuery::bindValue( const QString& placeholder, const QVariant& val ) { bindValue( placeholder, val, QSql::In ); } /*! \overload Binds the placeholder at position \a pos with type \c QSql::In. */ void QSqlQuery::bindValue( int pos, const QVariant& val ) { bindValue( pos, val, QSql::In ); } /*! \overload Binds the placeholder with type \c QSql::In. */ void QSqlQuery::addBindValue( const QVariant& val ) { addBindValue( val, QSql::In ); } /*! Returns the value for the \a placeholder. */ QVariant QSqlQuery::boundValue( const QString& placeholder ) const { if ( !d->sqlResult || !d->sqlResult->extension() ) return QVariant(); return d->sqlResult->extension()->boundValue( placeholder ); } /*! \overload Returns the value for the placeholder at position \a pos. */ QVariant QSqlQuery::boundValue( int pos ) const { if ( !d->sqlResult || !d->sqlResult->extension() ) return QVariant(); return d->sqlResult->extension()->boundValue( pos ); } /*! Returns a map of the bound values. The bound values can be examined in the following way: \code QSqlQuery query; ... // Examine the bound values - bound using named binding QMap<QString, QVariant>::ConstIterator it; QMap<QString, QVariant> vals = query.boundValues(); for ( it = vals.begin(); it != vals.end(); ++it ) qWarning( "Placeholder: " + it.key() + ", Value: " + (*it).toString() ); ... // Examine the bound values - bound using positional binding QValueList<QVariant>::ConstIterator it; QValueList<QVariant> list = query.boundValues().values(); int i = 0; for ( it = list.begin(); it != list.end(); ++it ) qWarning( "Placeholder pos: %d, Value: " + (*it).toString(), i++ ); ... \endcode */ QMap<QString,QVariant> QSqlQuery::boundValues() const { if ( !d->sqlResult || !d->sqlResult->extension() ) return QMap<QString,QVariant>(); return d->sqlResult->extension()->boundValues(); } /*! Returns the last query that was executed. In most cases this function returns the same as lastQuery(). If a prepared query with placeholders is executed on a DBMS that does not support it, the preparation of this query is emulated. The placeholders in the original query are replaced with their bound values to form a new query. This function returns the modified query. Useful for debugging purposes. \sa lastQuery() */ QString QSqlQuery::executedQuery() const { return d->executedQuery; } #endif // QT_NO_SQL