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+/****************************************************************************
+**
+** 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef INITDB_H
+#define INITDB_H
+
+#include <QtSql>
+
+void addBook(QSqlQuery &q, const QString &title, int year, const QVariant &authorId,
+             const QVariant &genreId, int rating)
+{
+    q.addBindValue(title);
+    q.addBindValue(year);
+    q.addBindValue(authorId);
+    q.addBindValue(genreId);
+    q.addBindValue(rating);
+    q.exec();
+}
+
+QVariant addGenre(QSqlQuery &q, const QString &name)
+{
+    q.addBindValue(name);
+    q.exec();
+    return q.lastInsertId();
+}
+
+QVariant addAuthor(QSqlQuery &q, const QString &name, const QDate &birthdate)
+{
+    q.addBindValue(name);
+    q.addBindValue(birthdate);
+    q.exec();
+    return q.lastInsertId();
+}
+
+const auto BOOKS_SQL = QLatin1String(R"(
+    create table books(id integer primary key, title varchar, author integer,
+                       genre integer, year integer, rating integer)
+    )");
+
+const auto AUTHORS_SQL =  QLatin1String(R"(
+    create table authors(id integer primary key, name varchar, birthdate date)
+    )");
+
+const auto GENRES_SQL = QLatin1String(R"(
+    create table genres(id integer primary key, name varchar)
+    )");
+
+const auto INSERT_AUTHOR_SQL = QLatin1String(R"(
+    insert into authors(name, birthdate) values(?, ?)
+    )");
+
+const auto INSERT_BOOK_SQL = QLatin1String(R"(
+    insert into books(title, year, author, genre, rating)
+                      values(?, ?, ?, ?, ?)
+    )");
+
+const auto INSERT_GENRE_SQL = QLatin1String(R"(
+    insert into genres(name) values(?)
+    )");
+
+QSqlError initDb()
+{
+    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
+    db.setDatabaseName(":memory:");
+
+    if (!db.open())
+        return db.lastError();
+
+    QStringList tables = db.tables();
+    if (tables.contains("books", Qt::CaseInsensitive)
+        && tables.contains("authors", Qt::CaseInsensitive))
+        return QSqlError();
+
+    QSqlQuery q;
+    if (!q.exec(BOOKS_SQL))
+        return q.lastError();
+    if (!q.exec(AUTHORS_SQL))
+        return q.lastError();
+    if (!q.exec(GENRES_SQL))
+        return q.lastError();
+
+    if (!q.prepare(INSERT_AUTHOR_SQL))
+        return q.lastError();
+    QVariant asimovId = addAuthor(q, QLatin1String("Isaac Asimov"), QDate(1920, 2, 1));
+    QVariant greeneId = addAuthor(q, QLatin1String("Graham Greene"), QDate(1904, 10, 2));
+    QVariant pratchettId = addAuthor(q, QLatin1String("Terry Pratchett"), QDate(1948, 4, 28));
+
+    if (!q.prepare(INSERT_GENRE_SQL))
+        return q.lastError();
+    QVariant sfiction = addGenre(q, QLatin1String("Science Fiction"));
+    QVariant fiction = addGenre(q, QLatin1String("Fiction"));
+    QVariant fantasy = addGenre(q, QLatin1String("Fantasy"));
+
+    if (!q.prepare(INSERT_BOOK_SQL))
+        return q.lastError();
+    addBook(q, QLatin1String("Foundation"), 1951, asimovId, sfiction, 3);
+    addBook(q, QLatin1String("Foundation and Empire"), 1952, asimovId, sfiction, 4);
+    addBook(q, QLatin1String("Second Foundation"), 1953, asimovId, sfiction, 3);
+    addBook(q, QLatin1String("Foundation's Edge"), 1982, asimovId, sfiction, 3);
+    addBook(q, QLatin1String("Foundation and Earth"), 1986, asimovId, sfiction, 4);
+    addBook(q, QLatin1String("Prelude to Foundation"), 1988, asimovId, sfiction, 3);
+    addBook(q, QLatin1String("Forward the Foundation"), 1993, asimovId, sfiction, 3);
+    addBook(q, QLatin1String("The Power and the Glory"), 1940, greeneId, fiction, 4);
+    addBook(q, QLatin1String("The Third Man"), 1950, greeneId, fiction, 5);
+    addBook(q, QLatin1String("Our Man in Havana"), 1958, greeneId, fiction, 4);
+    addBook(q, QLatin1String("Guards! Guards!"), 1989, pratchettId, fantasy, 3);
+    addBook(q, QLatin1String("Night Watch"), 2002, pratchettId, fantasy, 3);
+    addBook(q, QLatin1String("Going Postal"), 2004, pratchettId, fantasy, 3);
+
+    return QSqlError();
+}
+
+#endif