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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 give to the new savepoint.

NOTES
  Use ROLLBACK TO SAVEPOINT [rollback_to_savepoint(5)] to rollback to a
  savepoint. Use RELEASE SAVEPOINT [release_savepoint(5)] to destroy a
  savepoint, keeping the effects of commands executed after it was
  established.

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

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

  BEGIN;
      INSERT INTO table1 VALUES (1);
      SAVEPOINT my_savepoint;
      INSERT INTO table1 VALUES (2);
      ROLLBACK TO SAVEPOINT my_savepoint;
      INSERT INTO table1 VALUES (3);
  COMMIT;

  The above transaction will insert the values 1 and 3, but not 2.

  To establish and later destroy a savepoint:

  BEGIN;
      INSERT INTO table1 VALUES (3);
      SAVEPOINT my_savepoint;
      INSERT INTO table1 VALUES (4);
      RELEASE SAVEPOINT my_savepoint;
  COMMIT;

  The above transaction will insert both 3 and 4.

COMPATIBILITY
  SQL requires a savepoint to be destroyed automatically when another
  savepoint with the same name is established. In PostgreSQL, the old
  savepoint is kept, though only the more recent one will be used when
  rolling back or releasing. (Releasing the newer savepoint will cause the
  older one to again become accessible to ROLLBACK TO SAVEPOINT and RELEASE
  SAVEPOINT.) Otherwise, SAVEPOINT is fully SQL conforming.

SEE ALSO
  BEGIN [begin(5)], COMMIT [commit(l)], RELEASE SAVEPOINT
  [release_savepoint(l)], ROLLBACK [rollback(l)], ROLLBACK TO SAVEPOINT
  [rollback_to_savepoint(l)]

Index for Section 5

Alphabetical listing for S

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