AuroraMiddleware/qt5base-lts
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Example: Move the SQL statements

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Used const variables for the SQL statements,
so that the code looks similar to its
couterpart in Qt for Python.

Change-Id: If2a505a404deff77d3d37c5ffad913c8c538d0b3
Reviewed-by: Christian Tismer <tismer@stackless.com>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
This commit is contained in:
Venugopal Shivashankar 2019-05-22 16:41:15 +02:00
parent 859eb2467d
commit e3b3dbbe93
1 changed files with 32 additions and 6 deletions
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38
examples/sql/books/initdb.h
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@ -79,6 +79,32 @@ QVariant addAuthor(QSqlQuery &q, const QString &name, const QDate &birthdate)
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");
@ -93,26 +119,26 @@ QSqlError initDb()
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)")))
if (!q.exec(BOOKS_SQL))
return q.lastError();
if (!q.exec(QLatin1String("create table authors(id integer primary key, name varchar, birthdate date)")))
if (!q.exec(AUTHORS_SQL))
return q.lastError();
if (!q.exec(QLatin1String("create table genres(id integer primary key, name varchar)")))
if (!q.exec(GENRES_SQL))
return q.lastError();
if (!q.prepare(QLatin1String("insert into authors(name, birthdate) values(?, ?)")))
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(QLatin1String("insert into genres(name) values(?)")))
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(QLatin1String("insert into books(title, year, author, genre, rating) values(?, ?, ?, ?, ?)")))
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);