db2_pconnect

Description

Returns a persistent connection to an IBM DB2 Universal Database, IBM Cloudscape, or Apache Derby database. For more information on persistent connections, refer to Chapter 41.

Calling db2_close() on a persistent connection always returns TRUE, but the underlying DB2 client connection remains open and waiting to serve the next matching db2_pconnect() request.

Note that you are strongly urged to only use persistent connections on connections with autocommit turned on. If you attempt to combine transactions with persistent connections, issuing db2_commit() or db2_rollback() against a persistent connection will affect every persistent connection that is currently using the same underlying DB2 client connection. You may also rapidly experience locking escalation if you do not use autocommit for your persistent connections.

Parameters

Return Values

Returns a connection handle resource if the connection attempt is successful. db2_pconnect() tries to reuse an existing connection resource that exactly matches the database, username, and password parameters. If the connection attempt fails, db2_pconnect() returns FALSE.

Examples

Example 1. A db2_pconnect() example In the following example, the first call to db2_pconnect() returns a new persistent connection resource. The second call to db2_pconnect() returns a persistent connection resource that simply reuses the first persistent connection resource. <?php $database = 'SAMPLE'; $user = 'db2inst1'; $password = 'ibmdb2'; $pconn = db2_pconnect($database, $user, $password); if ($pconn) {     echo "Persistent connection succeeded."; } else {     echo "Persistent connection failed."; } $pconn2 = db2_pconnect($database, $user, $password); if ($pconn) {     echo "Second persistent connection succeeded."; } else {     echo "Second persistent connection failed."; } ?> The above example will output: Persistent connection succeeded. Second persistent connection succeeded.

See Also