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<?xml version="1.0" encoding="UTF-8"?>
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  <title>Qt 4.8: initdb.h Example File (demos/books/initdb.h)</title>
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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) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the demonstration applications of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** GNU Lesser General Public License Usage
 ** This file may be used under the terms of the GNU Lesser General Public
 ** License version 2.1 as published by the Free Software Foundation and
 ** appearing in the file LICENSE.LGPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU Lesser
 ** General Public License version 2.1 requirements will be met:
 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights. These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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 ** Public License version 3.0 as published by the Free Software Foundation
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 ** file. Please review the following information to ensure the GNU General
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 ** http://www.gnu.org/copyleft/gpl.html.
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 ** conditions contained in a signed written agreement between you and Nokia.
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 ****************************************************************************/</span>

 <span class="preprocessor">#ifndef INITDB_H</span>
 <span class="preprocessor">#define INITDB_H</span>

 <span class="preprocessor">#include &lt;QtSql&gt;</span>

 <span class="type">void</span> addBook(<span class="type"><a href="qsqlquery.html">QSqlQuery</a></span> <span class="operator">&amp;</span>q<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</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">&amp;</span>authorId<span class="operator">,</span>
              <span class="keyword">const</span> <span class="type"><a href="qvariant.html">QVariant</a></span> <span class="operator">&amp;</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">&amp;</span>q<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</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">&amp;</span>q<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>name<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qdate.html">QDate</a></span> <span class="operator">&amp;</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">&quot;QSQLITE&quot;</span>);
     db<span class="operator">.</span>setDatabaseName(<span class="string">&quot;:memory:&quot;</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">&quot;books&quot;</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>CaseInsensitive)
         <span class="operator">&amp;</span><span class="operator">&amp;</span> tables<span class="operator">.</span>contains(<span class="string">&quot;authors&quot;</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">&quot;create table books(id integer primary key, title varchar, author integer, genre integer, year integer, rating integer)&quot;</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">&quot;create table authors(id integer primary key, name varchar, birthdate date)&quot;</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">&quot;create table genres(id integer primary key, name varchar)&quot;</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">&quot;insert into authors(name, birthdate) values(?, ?)&quot;</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">&quot;Isaac Asimov&quot;</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">&quot;Graham Greene&quot;</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">&quot;Terry Pratchett&quot;</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">&quot;insert into genres(name) values(?)&quot;</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">&quot;Science Fiction&quot;</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">&quot;Fiction&quot;</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">&quot;Fantasy&quot;</span>));

     <span class="keyword">if</span> (<span class="operator">!</span>q<span class="operator">.</span>prepare(QLatin1String(<span class="string">&quot;insert into books(title, year, author, genre, rating) values(?, ?, ?, ?, ?)&quot;</span>)))
         <span class="keyword">return</span> q<span class="operator">.</span>lastError();
     addBook(q<span class="operator">,</span> QLatin1String(<span class="string">&quot;Foundation&quot;</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">&quot;Foundation and Empire&quot;</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">&quot;Second Foundation&quot;</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">&quot;Foundation's Edge&quot;</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">&quot;Foundation and Earth&quot;</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">&quot;Prelude to Foundation&quot;</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">&quot;Forward the Foundation&quot;</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">&quot;The Power and the Glory&quot;</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">&quot;The Third Man&quot;</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">&quot;Our Man in Havana&quot;</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">&quot;Guards! Guards!&quot;</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">&quot;Night Watch&quot;</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">&quot;Going Postal&quot;</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>
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<!-- @@@demos/books/initdb.h -->
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