General Information about QSQLITE

The SQLite plugin makes it possible to access SQLite databases. SQLite is an in-process database, which means that it is not necessary to have a database server. SQLite operates on a single file, which must be set as the database name when opening a connection. If the file does not exist, SQLite will try to create it. SQLite also supports in-memory databases, simply pass ":memory:" as the database name.

SQLite has some restrictions regarding multiple users and multiple transactions. If you try to read/write on a resource from different transactions, your application might freeze until one transaction commits or rolls back. The SQLite driver will retry to write to a locked resource until it runs into a timeout (see QSQLITE_BUSY_TIMEOUT at QSqlDatabase::setConnectOptions()).

In SQLite any column, with the exception of an INTEGER PRIMARY KEY column, may be used to store any type of value. For instance, a column declared as INTEGER may contain an integer value in one row and a text value in the next. This is due to SQLite associating the type of a value with the value itself rather than with the column it is stored in. A consequence of this is that the type returned by QSqlField::type() only indicates the field's recommended type. No assumption of the actual type should be made from this and the type of the individual values should be checked.

The driver is locked for updates while a select is executed. This may cause problems when using QSqlTableModel because the item views fetch data as needed, with QSqlQuery::fetchMore() in the case of QSqlTableModel.

You can find information about SQLite on SQLite