NAME

       ROLLBACK_TO_SAVEPOINT - roll back to a savepoint

SYNOPSIS

       ROLLBACK [ WORK | TRANSACTION ] TO [ SAVEPOINT ] savepoint_name

DESCRIPTION

       Roll back all commands that were executed after the savepoint was established. The
       savepoint remains valid and can be rolled back to again later, if needed.

       ROLLBACK TO SAVEPOINT implicitly destroys all savepoints that were established after the
       named savepoint.

PARAMETERS

       savepoint_name
           The savepoint to roll back to.

NOTES

       Use RELEASE SAVEPOINT to destroy a savepoint without discarding the effects of commands
       executed after it was established.

       Specifying a savepoint name that has not been established is an error.

       Cursors have somewhat non-transactional behavior with respect to savepoints. Any cursor
       that is opened inside a savepoint will be closed when the savepoint is rolled back. If a
       previously opened cursor is affected by a FETCH or MOVE command inside a savepoint that is
       later rolled back, the cursor remains at the position that FETCH left it pointing to (that
       is, the cursor motion caused by FETCH is not rolled back). Closing a cursor is not undone
       by rolling back, either. However, other side-effects caused by the cursor's query (such as
       side-effects of volatile functions called by the query) are rolled back if they occur
       during a savepoint that is later rolled back. A cursor whose execution causes a
       transaction to abort is put in a cannot-execute state, so while the transaction can be
       restored using ROLLBACK TO SAVEPOINT, the cursor can no longer be used.

EXAMPLES

       To undo the effects of the commands executed after my_savepoint was established:

           ROLLBACK TO SAVEPOINT my_savepoint;

       Cursor positions are not affected by savepoint rollback:

           BEGIN;

           DECLARE foo CURSOR FOR SELECT 1 UNION SELECT 2;

           SAVEPOINT foo;

           FETCH 1 FROM foo;
            ?column?
           ----------
                   1

           ROLLBACK TO SAVEPOINT foo;

           FETCH 1 FROM foo;
            ?column?
           ----------
                   2

           COMMIT;

COMPATIBILITY

       The SQL standard specifies that the key word SAVEPOINT is mandatory, but PostgreSQL and
       Oracle allow it to be omitted. SQL allows only WORK, not TRANSACTION, as a noise word
       after ROLLBACK. Also, SQL has an optional clause AND [ NO ] CHAIN which is not currently
       supported by PostgreSQL. Otherwise, this command conforms to the SQL standard.

SEE ALSO

       BEGIN(7), COMMIT(7), RELEASE SAVEPOINT (RELEASE_SAVEPOINT(7)), ROLLBACK(7), SAVEPOINT(7)