David wrote:
What I want to do is setup some kind of rule so that whenever a s_data
field is updated, that the time_stamp gets update to the current time/date.
Normally you want to do that with a before trigger rather than a rule.
Ok, I have no knowledge of Tiggers except what I just read in the docs
section. Look like I need to make a procudure then call it with a trigger.
Is there a better location for Tigger/Procudure Examples. The trigger
seems fairly, however I got lost in the procudure part.
David
David,
Here is a trigger function that I wrote for storing audit information.
Whether or not a query provides the user and/or timestamp this procedure
sets them. Naturally you will need to modify them for your data model.
CREATE OR REPLACE FUNCTION interface.tf_audit_data()
RETURNS "trigger" AS
$BODY$
BEGIN
-- Set the user name.
SELECT * FROM session_user INTO NEW.audit_user;
-- Set the timestamp.
NEW.audit_timestamp := ('now'::text)::timestamp(6) with time zone;
-- Send the modified record down the pipe.
RETURN NEW;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;
ALTER FUNCTION interface.tf_audit_data() OWNER TO postgres;
GRANT EXECUTE ON FUNCTION interface.tf_audit_data() TO postgres;
GRANT EXECUTE ON FUNCTION interface.tf_audit_data() TO public;
CREATE TRIGGER tgr_audit_data
BEFORE INSERT OR UPDATE
ON sales_order.tbl_line_item
FOR EACH ROW
EXECUTE PROCEDURE interface.tf_audit_data();
--
Kind Regards,
Keith
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