<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>database.h Example File | Qt SQL 5.12.2</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtsql-index.html">Qt SQL</a></td><td ><a href="qtsql-masterdetail-example.html">Master Detail Example</a></td><td >database.h Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtsql-index.html">Qt 5.12.2 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">database.h Example File</h1> <span class="subtitle">masterdetail/database.h</span> <!-- $$$masterdetail/database.h-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** 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." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#ifndef DATABASE_H</span> <span class="preprocessor">#define DATABASE_H</span> <span class="preprocessor">#include <QMessageBox></span> <span class="preprocessor">#include <QSqlDatabase></span> <span class="preprocessor">#include <QSqlError></span> <span class="preprocessor">#include <QSqlQuery></span> <span class="keyword">static</span> bool createConnection() { <span class="type"><a href="qsqldatabase.html">QSqlDatabase</a></span> db <span class="operator">=</span> <span class="type"><a href="qsqldatabase.html">QSqlDatabase</a></span><span class="operator">::</span>addDatabase(<span class="string">"QSQLITE"</span>); db<span class="operator">.</span>setDatabaseName(<span class="string">":memory:"</span>); <span class="keyword">if</span> (<span class="operator">!</span>db<span class="operator">.</span>open()) { <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>critical(nullptr<span class="operator">,</span> <span class="type"><a href="../qtcore/qobject.html">QObject</a></span><span class="operator">::</span>tr(<span class="string">"Cannot open database"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qobject.html">QObject</a></span><span class="operator">::</span>tr(<span class="string">"Unable to establish a database connection.\n"</span> <span class="string">"This example needs SQLite support. Please read "</span> <span class="string">"the Qt SQL driver documentation for information how "</span> <span class="string">"to build it.\n\n"</span> <span class="string">"Click Cancel to exit."</span>)<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel); <span class="keyword">return</span> <span class="keyword">false</span>; } <span class="type"><a href="qsqlquery.html">QSqlQuery</a></span> query; query<span class="operator">.</span>exec(<span class="string">"create table artists (id int primary key, "</span> <span class="string">"artist varchar(40), "</span> <span class="string">"albumcount int)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into artists values(0, '<all>', 0)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into artists values(1, 'Ane Brun', 2)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into artists values(2, 'Thomas Dybdahl', 3)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into artists values(3, 'Kaizers Orchestra', 3)"</span>); query<span class="operator">.</span>exec(<span class="string">"create table albums (albumid int primary key, "</span> <span class="string">"title varchar(50), "</span> <span class="string">"artistid int, "</span> <span class="string">"year int)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into albums values(1, 'Spending Time With Morgan', 1, "</span> <span class="string">"2003)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into albums values(2, 'A Temporary Dive', 1, 2005)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into albums values(3, '...The Great October Sound', 2, "</span> <span class="string">"2002)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into albums values(4, 'Stray Dogs', 2, 2003)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into albums values(5, "</span> <span class="string">"'One day you`ll dance for me, New York City', 2, 2004)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into albums values(6, 'Ompa Til Du D\xc3\xb8r', 3, 2001)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into albums values(7, 'Evig Pint', 3, 2002)"</span>); query<span class="operator">.</span>exec(<span class="string">"insert into albums values(8, 'Maestro', 3, 2005)"</span>); <span class="keyword">return</span> <span class="keyword">true</span>; } <span class="preprocessor">#endif</span> </pre> </div> <!-- @@@masterdetail/database.h --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>