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50
51 #ifndef INITDB_H
52 #define INITDB_H
53
54 #include <QtSql>
55
addBook(QSqlQuery & q,const QString & title,int year,const QVariant & authorId,const QVariant & genreId,int rating)56 void addBook(QSqlQuery &q, const QString &title, int year, const QVariant &authorId,
57 const QVariant &genreId, int rating)
58 {
59 q.addBindValue(title);
60 q.addBindValue(year);
61 q.addBindValue(authorId);
62 q.addBindValue(genreId);
63 q.addBindValue(rating);
64 q.exec();
65 }
66
addGenre(QSqlQuery & q,const QString & name)67 QVariant addGenre(QSqlQuery &q, const QString &name)
68 {
69 q.addBindValue(name);
70 q.exec();
71 return q.lastInsertId();
72 }
73
addAuthor(QSqlQuery & q,const QString & name,const QDate & birthdate)74 QVariant addAuthor(QSqlQuery &q, const QString &name, const QDate &birthdate)
75 {
76 q.addBindValue(name);
77 q.addBindValue(birthdate);
78 q.exec();
79 return q.lastInsertId();
80 }
81
initDb()82 QSqlError initDb()
83 {
84 QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
85 db.setDatabaseName(":memory:");
86
87 if (!db.open())
88 return db.lastError();
89
90 QStringList tables = db.tables();
91 if (tables.contains("books", Qt::CaseInsensitive)
92 && tables.contains("authors", Qt::CaseInsensitive))
93 return QSqlError();
94
95 QSqlQuery q;
96 if (!q.exec(QLatin1String("create table books(id integer primary key, title varchar, author integer, genre integer, year integer, rating integer)")))
97 return q.lastError();
98 if (!q.exec(QLatin1String("create table authors(id integer primary key, name varchar, birthdate date)")))
99 return q.lastError();
100 if (!q.exec(QLatin1String("create table genres(id integer primary key, name varchar)")))
101 return q.lastError();
102
103 if (!q.prepare(QLatin1String("insert into authors(name, birthdate) values(?, ?)")))
104 return q.lastError();
105 QVariant asimovId = addAuthor(q, QLatin1String("Isaac Asimov"), QDate(1920, 2, 1));
106 QVariant greeneId = addAuthor(q, QLatin1String("Graham Greene"), QDate(1904, 10, 2));
107 QVariant pratchettId = addAuthor(q, QLatin1String("Terry Pratchett"), QDate(1948, 4, 28));
108
109 if (!q.prepare(QLatin1String("insert into genres(name) values(?)")))
110 return q.lastError();
111 QVariant sfiction = addGenre(q, QLatin1String("Science Fiction"));
112 QVariant fiction = addGenre(q, QLatin1String("Fiction"));
113 QVariant fantasy = addGenre(q, QLatin1String("Fantasy"));
114
115 if (!q.prepare(QLatin1String("insert into books(title, year, author, genre, rating) values(?, ?, ?, ?, ?)")))
116 return q.lastError();
117 addBook(q, QLatin1String("Foundation"), 1951, asimovId, sfiction, 3);
118 addBook(q, QLatin1String("Foundation and Empire"), 1952, asimovId, sfiction, 4);
119 addBook(q, QLatin1String("Second Foundation"), 1953, asimovId, sfiction, 3);
120 addBook(q, QLatin1String("Foundation's Edge"), 1982, asimovId, sfiction, 3);
121 addBook(q, QLatin1String("Foundation and Earth"), 1986, asimovId, sfiction, 4);
122 addBook(q, QLatin1String("Prelude to Foundation"), 1988, asimovId, sfiction, 3);
123 addBook(q, QLatin1String("Forward the Foundation"), 1993, asimovId, sfiction, 3);
124 addBook(q, QLatin1String("The Power and the Glory"), 1940, greeneId, fiction, 4);
125 addBook(q, QLatin1String("The Third Man"), 1950, greeneId, fiction, 5);
126 addBook(q, QLatin1String("Our Man in Havana"), 1958, greeneId, fiction, 4);
127 addBook(q, QLatin1String("Guards! Guards!"), 1989, pratchettId, fantasy, 3);
128 addBook(q, QLatin1String("Night Watch"), 2002, pratchettId, fantasy, 3);
129 addBook(q, QLatin1String("Going Postal"), 2004, pratchettId, fantasy, 3);
130
131 return QSqlError();
132 }
133
134 #endif
135