<?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>initdb.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-books-example.html">Books</a></td><td >initdb.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">initdb.h Example File</h1> <span class="subtitle">books/initdb.h</span> <!-- $$$books/initdb.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 demonstration applications 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 INITDB_H</span> <span class="preprocessor">#define INITDB_H</span> <span class="preprocessor">#include <QtSql></span> <span class="type">void</span> addBook(<span class="type"><a href="qsqlquery.html">QSqlQuery</a></span> <span class="operator">&</span>q<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>title<span class="operator">,</span> <span class="type">int</span> year<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> <span class="operator">&</span>authorId<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> <span class="operator">&</span>genreId<span class="operator">,</span> <span class="type">int</span> rating) { q<span class="operator">.</span>addBindValue(title); q<span class="operator">.</span>addBindValue(year); q<span class="operator">.</span>addBindValue(authorId); q<span class="operator">.</span>addBindValue(genreId); q<span class="operator">.</span>addBindValue(rating); q<span class="operator">.</span>exec(); } <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> addGenre(<span class="type"><a href="qsqlquery.html">QSqlQuery</a></span> <span class="operator">&</span>q<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>name) { q<span class="operator">.</span>addBindValue(name); q<span class="operator">.</span>exec(); <span class="keyword">return</span> q<span class="operator">.</span>lastInsertId(); } <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> addAuthor(<span class="type"><a href="qsqlquery.html">QSqlQuery</a></span> <span class="operator">&</span>q<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>name<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qdate.html">QDate</a></span> <span class="operator">&</span>birthdate) { q<span class="operator">.</span>addBindValue(name); q<span class="operator">.</span>addBindValue(birthdate); q<span class="operator">.</span>exec(); <span class="keyword">return</span> q<span class="operator">.</span>lastInsertId(); } <span class="type"><a href="qsqlerror.html">QSqlError</a></span> initDb() { <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="keyword">return</span> db<span class="operator">.</span>lastError(); <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> tables <span class="operator">=</span> db<span class="operator">.</span>tables(); <span class="keyword">if</span> (tables<span class="operator">.</span>contains(<span class="string">"books"</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CaseInsensitive) <span class="operator">&</span><span class="operator">&</span> tables<span class="operator">.</span>contains(<span class="string">"authors"</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>CaseInsensitive)) <span class="keyword">return</span> <span class="type"><a href="qsqlerror.html">QSqlError</a></span>(); <span class="type"><a href="qsqlquery.html">QSqlQuery</a></span> q; <span class="keyword">if</span> (<span class="operator">!</span>q<span class="operator">.</span>exec(QLatin1String(<span class="string">"create table books(id integer primary key, title varchar, author integer, genre integer, year integer, rating integer)"</span>))) <span class="keyword">return</span> q<span class="operator">.</span>lastError(); <span class="keyword">if</span> (<span class="operator">!</span>q<span class="operator">.</span>exec(QLatin1String(<span class="string">"create table authors(id integer primary key, name varchar, birthdate date)"</span>))) <span class="keyword">return</span> q<span class="operator">.</span>lastError(); <span class="keyword">if</span> (<span class="operator">!</span>q<span class="operator">.</span>exec(QLatin1String(<span class="string">"create table genres(id integer primary key, name varchar)"</span>))) <span class="keyword">return</span> q<span class="operator">.</span>lastError(); <span class="keyword">if</span> (<span class="operator">!</span>q<span class="operator">.</span>prepare(QLatin1String(<span class="string">"insert into authors(name, birthdate) values(?, ?)"</span>))) <span class="keyword">return</span> q<span class="operator">.</span>lastError(); <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> asimovId <span class="operator">=</span> addAuthor(q<span class="operator">,</span> QLatin1String(<span class="string">"Isaac Asimov"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qdate.html">QDate</a></span>(<span class="number">1920</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span>)); <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> greeneId <span class="operator">=</span> addAuthor(q<span class="operator">,</span> QLatin1String(<span class="string">"Graham Greene"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qdate.html">QDate</a></span>(<span class="number">1904</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">2</span>)); <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> pratchettId <span class="operator">=</span> addAuthor(q<span class="operator">,</span> QLatin1String(<span class="string">"Terry Pratchett"</span>)<span class="operator">,</span> <span class="type"><a href="../qtcore/qdate.html">QDate</a></span>(<span class="number">1948</span><span class="operator">,</span> <span class="number">4</span><span class="operator">,</span> <span class="number">28</span>)); <span class="keyword">if</span> (<span class="operator">!</span>q<span class="operator">.</span>prepare(QLatin1String(<span class="string">"insert into genres(name) values(?)"</span>))) <span class="keyword">return</span> q<span class="operator">.</span>lastError(); <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> sfiction <span class="operator">=</span> addGenre(q<span class="operator">,</span> QLatin1String(<span class="string">"Science Fiction"</span>)); <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> fiction <span class="operator">=</span> addGenre(q<span class="operator">,</span> QLatin1String(<span class="string">"Fiction"</span>)); <span class="type"><a href="../qtcore/qvariant.html">QVariant</a></span> fantasy <span class="operator">=</span> addGenre(q<span class="operator">,</span> QLatin1String(<span class="string">"Fantasy"</span>)); <span class="keyword">if</span> (<span class="operator">!</span>q<span class="operator">.</span>prepare(QLatin1String(<span class="string">"insert into books(title, year, author, genre, rating) values(?, ?, ?, ?, ?)"</span>))) <span class="keyword">return</span> q<span class="operator">.</span>lastError(); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Foundation"</span>)<span class="operator">,</span> <span class="number">1951</span><span class="operator">,</span> asimovId<span class="operator">,</span> sfiction<span class="operator">,</span> <span class="number">3</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Foundation and Empire"</span>)<span class="operator">,</span> <span class="number">1952</span><span class="operator">,</span> asimovId<span class="operator">,</span> sfiction<span class="operator">,</span> <span class="number">4</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Second Foundation"</span>)<span class="operator">,</span> <span class="number">1953</span><span class="operator">,</span> asimovId<span class="operator">,</span> sfiction<span class="operator">,</span> <span class="number">3</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Foundation's Edge"</span>)<span class="operator">,</span> <span class="number">1982</span><span class="operator">,</span> asimovId<span class="operator">,</span> sfiction<span class="operator">,</span> <span class="number">3</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Foundation and Earth"</span>)<span class="operator">,</span> <span class="number">1986</span><span class="operator">,</span> asimovId<span class="operator">,</span> sfiction<span class="operator">,</span> <span class="number">4</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Prelude to Foundation"</span>)<span class="operator">,</span> <span class="number">1988</span><span class="operator">,</span> asimovId<span class="operator">,</span> sfiction<span class="operator">,</span> <span class="number">3</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Forward the Foundation"</span>)<span class="operator">,</span> <span class="number">1993</span><span class="operator">,</span> asimovId<span class="operator">,</span> sfiction<span class="operator">,</span> <span class="number">3</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"The Power and the Glory"</span>)<span class="operator">,</span> <span class="number">1940</span><span class="operator">,</span> greeneId<span class="operator">,</span> fiction<span class="operator">,</span> <span class="number">4</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"The Third Man"</span>)<span class="operator">,</span> <span class="number">1950</span><span class="operator">,</span> greeneId<span class="operator">,</span> fiction<span class="operator">,</span> <span class="number">5</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Our Man in Havana"</span>)<span class="operator">,</span> <span class="number">1958</span><span class="operator">,</span> greeneId<span class="operator">,</span> fiction<span class="operator">,</span> <span class="number">4</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Guards! Guards!"</span>)<span class="operator">,</span> <span class="number">1989</span><span class="operator">,</span> pratchettId<span class="operator">,</span> fantasy<span class="operator">,</span> <span class="number">3</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Night Watch"</span>)<span class="operator">,</span> <span class="number">2002</span><span class="operator">,</span> pratchettId<span class="operator">,</span> fantasy<span class="operator">,</span> <span class="number">3</span>); addBook(q<span class="operator">,</span> QLatin1String(<span class="string">"Going Postal"</span>)<span class="operator">,</span> <span class="number">2004</span><span class="operator">,</span> pratchettId<span class="operator">,</span> fantasy<span class="operator">,</span> <span class="number">3</span>); <span class="keyword">return</span> <span class="type"><a href="qsqlerror.html">QSqlError</a></span>(); } <span class="preprocessor">#endif</span> </pre> </div> <!-- @@@books/initdb.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>