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82 lines
3.5 KiB
C
82 lines
3.5 KiB
C
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#ifndef CONNECTION_H
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#define CONNECTION_H
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#include <QMessageBox>
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#include <QSqlDatabase>
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#include <QSqlError>
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#include <QSqlQuery>
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/*
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This file defines a helper function to open a connection to an
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in-memory SQLITE database and to create a test table.
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If you want to use another database, simply modify the code
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below. All the examples in this directory use this function to
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connect to a database.
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*/
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//! [0]
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static bool createConnection()
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{
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QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
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db.setDatabaseName(":memory:");
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if (!db.open()) {
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QMessageBox::critical(nullptr, QObject::tr("Cannot open database"),
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QObject::tr("Unable to establish a database connection.\n"
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"This example needs SQLite support. Please read "
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"the Qt SQL driver documentation for information how "
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"to build it.\n\n"
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"Click Cancel to exit."), QMessageBox::Cancel);
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return false;
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}
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QSqlQuery query;
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query.exec("create table person (id int primary key, "
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"firstname varchar(20), lastname varchar(20))");
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query.exec("insert into person values(101, 'Danny', 'Young')");
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query.exec("insert into person values(102, 'Christine', 'Holand')");
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query.exec("insert into person values(103, 'Lars', 'Gordon')");
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query.exec("insert into person values(104, 'Roberto', 'Robitaille')");
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query.exec("insert into person values(105, 'Maria', 'Papadopoulos')");
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query.exec("create table items (id int primary key,"
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"imagefile int,"
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"itemtype varchar(20),"
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"description varchar(100))");
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query.exec("insert into items "
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"values(0, 0, 'Qt',"
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"'Qt is a full development framework with tools designed to "
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"streamline the creation of stunning applications and "
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"amazing user interfaces for desktop, embedded and mobile "
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"platforms.')");
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query.exec("insert into items "
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"values(1, 1, 'Qt Quick',"
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"'Qt Quick is a collection of techniques designed to help "
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"developers create intuitive, modern-looking, and fluid "
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"user interfaces using a CSS & JavaScript like language.')");
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query.exec("insert into items "
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"values(2, 2, 'Qt Creator',"
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"'Qt Creator is a powerful cross-platform integrated "
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"development environment (IDE), including UI design tools "
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"and on-device debugging.')");
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query.exec("insert into items "
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"values(3, 3, 'Qt Project',"
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"'The Qt Project governs the open source development of Qt, "
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"allowing anyone wanting to contribute to join the effort "
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"through a meritocratic structure of approvers and "
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"maintainers.')");
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query.exec("create table images (itemid int, file varchar(20))");
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query.exec("insert into images values(0, 'images/qt-logo.png')");
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query.exec("insert into images values(1, 'images/qt-quick.png')");
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query.exec("insert into images values(2, 'images/qt-creator.png')");
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query.exec("insert into images values(3, 'images/qt-project.png')");
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return true;
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}
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//! [0]
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#endif
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