If called without an argument, this function rolls back the default
transaction of the default link. If the argument is a connection
identifier, the default transaction of the corresponding connection
will be rolled back. If the argument is a transaction identifier, the
corresponding transaction will be rolled back. The transaction context
will be retained, so statements executed from within this transaction
will not be invalidated.
Dönen Değerler
Başarı durumunda true, başarısızlık durumunda false döner.
