Connect to Sqlite and do insert, delete, update and select
2017-09-19 22:45
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Connect to Sqlite and do insert, delete, update and select
Foundations of Qt Development\Chapter13\sqltest\sqlite\main.cpp /* * Copyright (c) 2006-2007, Johan Thelin * * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of APress nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include <QApplication> #include <QtSql> #include <QtDebug> int main( int argc, char **argv ) { QApplication app( argc, argv ); QSqlDatabase db = QSqlDatabase::addDatabase( "QSQLITE" ); db.setDatabaseName( "./testdatabase.db" ); if( !db.open() ) { qDebug() << db.lastError(); qFatal( "Failed to connect." ); } qDebug( "Connected!" ); QSqlQuery qry; qry.prepare( "CREATE TABLE IF NOT EXISTS names (id INTEGER UNIQUE PRIMARY KEY, firstname VARCHAR(30), lastname VARCHAR(30))" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug() << "Table created!"; qry.prepare( "INSERT INTO names (id, firstname, lastname) VALUES (1, 'John', 'Doe')" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Inserted!" ); qry.prepare( "INSERT INTO names (id, firstname, lastname) VALUES (2, 'Jane', 'Doe')" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Inserted!" ); qry.prepare( "INSERT INTO names 4000 (id, firstname, lastname) VALUES (3, 'James', 'Doe')" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Inserted!" ); qry.prepare( "INSERT INTO names (id, firstname, lastname) VALUES (4, 'Judy', 'Doe')" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Inserted!" ); qry.prepare( "INSERT INTO names (id, firstname, lastname) VALUES (5, 'Richard', 'Roe')" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Inserted!" ); qry.prepare( "INSERT INTO names (id, firstname, lastname) VALUES (6, 'Jane', 'Roe')" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Inserted!" ); qry.prepare( "INSERT INTO names (id, firstname, lastname) VALUES (7, 'John', 'Noakes')" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Inserted!" ); qry.prepare( "INSERT INTO names (id, firstname, lastname) VALUES (8, 'Donna', 'Doe')" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Inserted!" ); qry.prepare( "INSERT INTO names (id, firstname, lastname) VALUES (9, 'Ralph', 'Roe')" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Inserted!" ); qry.prepare( "SELECT * FROM names" ); if( !qry.exec() ) qDebug() << qry.lastError(); else { qDebug( "Selected!" ); QSqlRecord rec = qry.record(); int cols = rec.count(); for( int c=0; c<cols; c++ ) qDebug() << QString( "Column %1: %2" ).arg( c ).arg( rec.fieldName(c) ); for( int r=0; qry.next(); r++ ) for( int c=0; c<cols; c++ ) qDebug() << QString( "Row %1, %2: %3" ).arg( r ).arg( rec.fieldName(c) ).arg( qry.value(c).toString() ); } qry.prepare( "SELECT firstname, lastname FROM names WHERE lastname = 'Roe'" ); if( !qry.exec() ) qDebug() << qry.lastError(); else { qDebug( "Selected!" ); QSqlRecord rec = qry.record(); int cols = rec.count(); for( int c=0; c<cols; c++ ) qDebug() << QString( "Column %1: %2" ).arg( c ).arg( rec.fieldName(c) ); for( int r=0; qry.next(); r++ ) for( int c=0; c<cols; c++ ) qDebug() << QString( "Row %1, %2: %3" ).arg( r ).arg( rec.fieldName(c) ).arg( qry.value(c).toString() ); } qry.prepare( "SELECT firstname, lastname FROM names WHERE lastname = 'Roe' ORDER BY firstname" ); if( !qry.exec() ) qDebug() << qry.lastError(); else { qDebug( "Selected!" ); QSqlRecord rec = qry.record(); int cols = rec.count(); for( int c=0; c<cols; c++ ) qDebug() << QString( "Column %1: %2" ).arg( c ).arg( rec.fieldName(c) ); for( int r=0; qry.next(); r++ ) for( int c=0; c<cols; c++ ) qDebug() << QString( "Row %1, %2: %3" ).arg( r ).arg( rec.fieldName(c) ).arg( qry.value(c).toString() ); } qry.prepare( "SELECT lastname, COUNT(*) as 'members' FROM names GROUP BY lastname ORDER BY lastname" ); if( !qry.exec() ) qDebug() << qry.lastError(); else { qDebug( "Selected!" ); QSqlRecord rec = qry.record(); int cols = rec.count(); for( int c=0; c<cols; c++ ) qDebug() << QString( "Column %1: %2" ).arg( c ).arg( rec.fieldName(c) ); for( int r=0; qry.next(); r++ ) for( int c=0; c<cols; c++ ) qDebug() << QString( "Row %1, %2: %3" ).arg( r ).arg( rec.fieldName(c) ).arg( qry.value(c).toString() ); } qry.prepare( "UPDATE names SET firstname = 'Nisse', lastname = 'Svensson' WHERE id = 7" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Updated!" ); qry.prepare( "UPDATE names SET lastname = 'Johnson' WHERE firstname = 'Jane'" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Updated!" ); qry.prepare( "DELETE FROM names WHERE id = 7" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Deleted!" ); qry.prepare( "DELETE FROM names WHERE lastname = 'Johnson'" ); if( !qry.exec() ) qDebug() << qry.lastError(); else qDebug( "Deleted!" ); db.close(); return 0; }
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