Postgres Plus Advanced Server Oracle Compatibility Developer's Guide :

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3.3.53 SAVEPOINT

Name

SAVEPOINT -- define a new savepoint within the current transaction

Synopsis

SAVEPOINT savepoint_name

Description

SAVEPOINT establishes a new savepoint within the current transaction.

A savepoint is a special mark inside a transaction that allows all commands that are executed after it was established to be rolled back, restoring the transaction state to what it was at the time of the savepoint.

Parameters

savepoint_name

The name to be given to the savepoint.

Notes

Use ROLLBACK TO SAVEPOINT to roll back to a savepoint.

Savepoints can only be established when inside a transaction block. There can be multiple savepoints defined within a transaction.

When another savepoint is established with the same name as a previous savepoint, the old savepoint is kept, though only the more recent one will be used when rolling back.

SAVEPOINT is not supported within SPL programs.

Examples

To establish a savepoint and later undo the effects of all commands executed after it was established:

\set AUTOCOMMIT off
INSERT INTO dept VALUES (50, 'HR', 'NEW YORK');
SAVEPOINT depts;
INSERT INTO emp (empno, ename, deptno) VALUES (9001, 'JONES', 50);
INSERT INTO emp (empno, ename, deptno) VALUES (9002, 'ALICE', 50);
SAVEPOINT emps;
INSERT INTO jobhist VALUES (9001,'17-SEP-07',NULL,'CLERK',800,NULL,50,'New Hire');
INSERT INTO jobhist VALUES (9002,'20-SEP-07',NULL,'CLERK',700,NULL,50,'New Hire');
ROLLBACK TO depts;
COMMIT;

The above transaction will commit a row into the dept table, but the inserts into the emp and jobhist tables are rolled back.

See Also

COMMIT, ROLLBACK, ROLLBACK TO SAVEPOINT

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