database.h Example File

masterdetail/database.h
/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "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 The Qt Company Ltd 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/
#ifndef DATABASE_H #define DATABASE_H #include <QMessageBox> #include <QSqlDatabase> #include <QSqlError> #include <QSqlQuery> static bool createConnection() { QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE"); db.setDatabaseName(":memory:"); if (!db.open()) { QMessageBox::critical(nullptr, QObject::tr("Cannot open database"), QObject::tr("Unable to establish a database connection.\n" "This example needs SQLite support. Please read " "the Qt SQL driver documentation for information how " "to build it.\n\n" "Click Cancel to exit."), QMessageBox::Cancel); return false; } QSqlQuery query; query.exec("create table artists (id int primary key, " "artist varchar(40), " "albumcount int)"); query.exec("insert into artists values(0, '<all>', 0)"); query.exec("insert into artists values(1, 'Ane Brun', 2)"); query.exec("insert into artists values(2, 'Thomas Dybdahl', 3)"); query.exec("insert into artists values(3, 'Kaizers Orchestra', 3)"); query.exec("create table albums (albumid int primary key, " "title varchar(50), " "artistid int, " "year int)"); query.exec("insert into albums values(1, 'Spending Time With Morgan', 1, " "2003)"); query.exec("insert into albums values(2, 'A Temporary Dive', 1, 2005)"); query.exec("insert into albums values(3, '...The Great October Sound', 2, " "2002)"); query.exec("insert into albums values(4, 'Stray Dogs', 2, 2003)"); query.exec("insert into albums values(5, " "'One day you`ll dance for me, New York City', 2, 2004)"); query.exec("insert into albums values(6, 'Ompa Til Du D\xc3\xb8r', 3, 2001)"); query.exec("insert into albums values(7, 'Evig Pint', 3, 2002)"); query.exec("insert into albums values(8, 'Maestro', 3, 2005)"); return true; } #endif