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So for example, a SQL query such as:. If the table or field name is not quoted when created, the actual table name or field name will be lower-case. When QSqlDatabase::record or QSqlDatabase::primaryIndex access a table or field that was unquoted when created, the name passed to the function must be lower-case to ensure it is found.

If the plugin is built with an older version, then forward-only mode will not be available - calling QSqlQuery::setForwardOnly with true will have no effect. While navigating the results in forward-only mode, the handle of QSqlResult may change.

Applications that use the low-level handle of SQL result must get a new handle after each call to any of QSqlResult fetch functions. While reading the results of a forward-only query with PostgreSQL, the database connection cannot be used to execute other queries. This is a limitation of libpq library. This problem will not occur if query1 and query2 use different database connections, or if we execute query2 after the while loop.

Note: Some methods of QSqlDatabase like tables , primaryIndex implicity execute SQL queries, so these also cannot be used while navigating the results of forward-only query. Install the appropriate PostgreSQL developer libraries for your compiler. When you distribute your application, remember to include libpq.

QTDS is obsolete from Qt 4. It is not possible to set the port with QSqlDatabase::setPort due to limitations in the Sybase client library. Refer to the Sybase documentation for information on how to set up a Sybase client configuration file to enable connections to databases on non-default ports. Regardless of which library you use, the shared object file libsybdb.

Set the SYBASE environment variable to point to the directory where you installed the client library and execute qmake :. LIB to build the plugin:. By default, the Microsoft library is used on Windows. The DB2 header and include files should already be installed in the right directories.

The Qt SQLite 2 plugin is offered for compatibility. Whenever possible, use the version 3 plugin instead. The build instructions for version 3 apply to version 2 as well. 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 and temporary databases.

Simply pass respectively ":memory:" or an empty string as the database name. SQLite has some restrictions regarding multiple users and multiple transactions. 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. SQLite version 3 is included as a third-party library within Qt. It can be built by passing the -qt-sqlite parameter to the configure script. If you do not want to use the SQLite library included with Qt, you can pass -system-sqlite to the configure script to use the SQLite libraries of the operating system.

This is recommended whenever possible, as it reduces the installation size and removes one component for which you need to track security advisories. However the needed implementation must be provided by the user. For better performance the regular expressions are cached internally. By default the cache size is 25, but it can be changed through the option's value. SQLite minor releases sometimes break file format forward compatibility. For example, SQLite 3.