Re: Post Gres triggers for trail

You probably want to run the trigger "BEFORE UPDATE" unless you have some other code depending on the value of modified_date during the update, and also instead of "RETURN NULL;" do a "RETURN NEW;". Here's an example from one of my triggers:

Trigger definition:
CREATE TRIGGER trig_rec_returndate
BEFORE UPDATE
ON rec_main
FOR EACH ROW
EXECUTE PROCEDURE fun_rec_returndate();

Trigger function definition:
CREATE OR REPLACE FUNCTION fun_rec_returndate()
RETURNS "trigger" AS
'BEGIN
IF NEW.returncode IS NOT NULL THEN
IF OLD.returndate IS NULL THEN
NEW.returndate := \'now\';
END IF;
END IF;
RETURN NEW;
END;'
LANGUAGE 'plpgsql' VOLATILE;

In that case returndate is a timestamp. Hope it helps!

Jason Minion

-----Original Message-----
From: pgsql-admin-owner(at)postgresql(dot)org [mailto:pgsql-admin-owner(at)postgresql(dot)org]On Behalf Of Mandar M Bhosale
Sent: Monday, April 25, 2005 9:36 AM
To: pgsql-admin(at)postgresql(dot)org
Subject: [ADMIN] Post Gres triggers for trail

I have difficulty in setting a trigger to have trail of my project

I need to update the modified_date of my database tables through trigger as

CREATE OR REPLACE TRIGGER taril_trigger AFTER UPDATE ON test_trigger FOR EACH ROW
EXECUTE PROCEDURE pro_trail();

pro_trail(){
BEGIN
NEW.modified_date=(select current_timestamp)
return NULL;
END;
}

Can anybody help me out!!!

Mandar M. Bhosale