initdb.h Example File

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#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(); } QSqlError initDb() { QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE"); db.setDatabaseName(":memory:"); if (! 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(QLatin1String("create table books(id integer primary key, title varchar, author integer, genre integer, year integer, rating integer)"))) return q.lastError(); if (!q.exec(QLatin1String("create table authors(id integer primary key, name varchar, birthdate date)"))) return q.lastError(); if (!q.exec(QLatin1String("create table genres(id integer primary key, name varchar)"))) return q.lastError(); if (!q.prepare(QLatin1String("insert into authors(name, birthdate) values(?, ?)"))) 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(QLatin1String("insert into genres(name) values(?)"))) 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(QLatin1String("insert into books(title, year, author, genre, rating) values(?, ?, ?, ?, ?)"))) 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

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