Re: Does RAISE EXCEPTION rollback previous commands in a stored function?

Alexander Farber wrote:
> how to set such a savepoint inside of a stored function?
>
> Can I call "START TRANSACTION", and then at some point later in the same stored function call RAISE
> EXCEPTION?

I realize that what I wrote must be confusing.

You cannot use START TRANSACTION, BEGIN, SAVEPOINT, COMMIT or ROLLBACK
inside a function. A function always runs within one transaction.

Savepoints or subtransactions are written with a BEGIN ... EXCEPTION
block in PL/pgSQL, so you could write:

DECLARE FUNCTION .... AS
$$BEGIN
/* UPDATE 1 */
UPDATE ...;
BEGIN /* sets a savepoint */
/* UPDATE 2, can cause an error */
UPDATE ...;
EXCEPTION
/* rollback to savepoint, ignore error */
WHEN OTHERS THEN NULL;
END;
END;$$;

Even if UPDATE 2 throws an error, UPDATE 1 will be committed.

Yours,
Laurenz Albe