I'm trying to write a trigger that updates a date_changed field on a record anytime that record is updated. I have a function written, and the trigger created, but everytime I update the record, I get a recursion limit error. It appears that the action performed by my trigger is causing the trigger to fire. How do I avoid that. For the record, here's my function (modeled after a trigger that works on SQL Server. I'm pretty much a noob with plpgsql :)
declare begin
update unit_specification set date_changed = now() from unit_specification us where us.id = NEW.id;
RETURN NEW;
end;
With the trigger created with
CREATE TRIGGER update_changed_ts AFTER INSERT OR UPDATE
ON unit_specification FOR EACH ROW
EXECUTE PROCEDURE public.update_unit_spec_changed_date();
Thanks for the help. :)
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Jason Lee, SCJP
Senior Software Engineer