On Mon, 14 Jun 2004, Jie Liang wrote:
> I have a question about performance, in SQL commands: there is a > prepare/execute command, document says it will improve the performance > while repeatly execute a statement. In java.sql: there is a > PreparedStatement object, which can store precompiled SQL statement, > document says it can improve the performance also. > If I use java jdbc to connect postgresql database, which one I should > use? Can I use both? > When using JDBC it is best to use the standard Statement/PreparedStatement interfaces. It is possible to directly use PREPARE/EXECUTE, but this can be handled by the driver. Let me give you a run down of the different driver versions and their capabilities: Current released version: can enable using PREPARE/EXECUTE behind the scenes on PreparedStatement by casting the prepared statement to PGStatement and issuing setUseServerPrepare. Current cvs version: can enable using PREPARE/EXECUTE by setting an execution threshold that will turn it on when reached. This threshold can be set at a number of levels, see the following for more information http://www.ejurka.com/pgsql/docs/cvs/ch09s05.html Soon to be committed cvs version: can directly use server prepared statements without using the SQL level PREPARE/EXECUTE. Kris Jurka ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
