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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(); |
| } |
| |
| 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 |