>PostgreSQL 8.0 introduced PL/pgSQL exception handlers.
>http://www.postgresql.org/docs/8.0/interactive/plpgsql-control-structures.h
tml#PLPGSQL-ERROR-TRAPPING
>Regardless of whether the trigger is BEFORE or AFTER, an untrapped
>error will abort the insert.
>CREATE FUNCTION trigfunc() RETURNS trigger AS '
>DECLARE
> i integer;
>BEGIN
> i := NEW.x / 0;
> RETURN NULL;
>END;
>' LANGUAGE plpgsql;
>CREATE TABLE foo (x integer);
>CREATE TRIGGER footrig_after AFTER INSERT ON foo
> FOR EACH ROW EXECUTE PROCEDURE trigfunc();
>INSERT INTO foo VALUES (123);
>ERROR: division by zero
>CONTEXT: PL/pgSQL function "trigfunc" line 4 at assignment
>SELECT * FROM foo;
> x
>---
>(0 rows)
>--
>Michael Fuhr
>http://www.fuhr.org/~mfuhr/
So, the answer is: "double check every operation and use exeption handlers"
What about performance, if its a matter of choice between after or before
insert, what perform better?
thanks