(PHP 4 >= 4.0.2, PHP 5 <= 5.0.5, PECL ingres:1.0-1.4.3)
ingres_rollback — Roll back a transaction
ingres_rollback() rolls back the currently open transaction, actually canceling all changes made to the database during the transaction.
This closes the transaction. A new one can be open by sending a query with ingres_query().
The connection link identifier. If not specified, the last opened link is used.
如果成功则返回 TRUE，失败则返回 FALSE。