DragonFly On-Line Manual Pages
ROLLBACK TO SAVEPOINT(7) PostgreSQL 9.5.0 Documentation
ROLLBACK_TO_SAVEPOINT - roll back to a savepoint
ROLLBACK [ WORK | TRANSACTION ] TO [ SAVEPOINT ] savepoint_name
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.
The savepoint to roll back to.
Use RELEASE SAVEPOINT (RELEASE_SAVEPOINT(7)) to destroy a savepoint
without discarding the effects of commands executed after it was
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.
To undo the effects of the commands executed after my_savepoint was
ROLLBACK TO SAVEPOINT my_savepoint;
Cursor positions are not affected by savepoint rollback:
DECLARE foo CURSOR FOR SELECT 1 UNION SELECT 2;
FETCH 1 FROM foo;
ROLLBACK TO SAVEPOINT foo;
FETCH 1 FROM foo;
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.
BEGIN(7), COMMIT(7), RELEASE SAVEPOINT (RELEASE_SAVEPOINT(7)),
PostgreSQL 9.5.0 2016 ROLLBACK TO SAVEPOINT(7)