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<h1 class="title">initdb.h Example File</h1>
<span class="small-subtitle">demos/books/initdb.h</span>
<!-- $$$demos/books/initdb.h-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
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****************************************************************************/</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="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="qvariant.html">QVariant</a></span> <span class="operator">&</span>authorId<span class="operator">,</span>
<span class="keyword">const</span> <span class="type"><a href="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="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="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="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="qstring.html">QString</a></span> <span class="operator">&</span>name<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="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="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="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="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="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="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="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="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="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="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="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="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="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>
<!-- @@@demos/books/initdb.h -->
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