From: Richard Broersma Jr <rabroersma@yahoo.com>
To: SQL Postgresql List <pgsql-sql@postgresql.org>
Subject: Advice for generalizing trigger functions
Date: Tue, 25 Dec 2007 16:20:53 -0800 (PST)
Message-ID: <781842.52422.qm@web31813.mail.mud.yahoo.com> (raw)
I've created quite a few functions that log modifications to various history tables. (the history table has the same name as the base table but is prefixed by the 'History.' schema.) The only difference between functions I can find is the table name.
Is there any way to generalize these myriad of functions into one?
Below is a sample of a typical logging trigger function.
Regards,
Richard Broersma Jr.
CREATE OR REPLACE FUNCTION "project"."log_managers_ops"()
RETURNS trigger AS
$BODY$
BEGIN
IF TG_OP IN ( 'UPDATE', 'DELETE' ) THEN
UPDATE History.Managers AS M
SET endts = now()
WHERE M.manager_id = OLD.manager_id
AND now() BETWEEN M.startts AND M.endts;
end IF;
IF TG_OP IN ( 'UPDATE', 'INSERT' ) THEN
INSERT INTO History.Managers
VALUES ( now()::timestamptz, 'INFINITY'::timestamptz, NEW.*);
RETURN NEW;
END IF;
RETURN OLD;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE SECURITY DEFINER;
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To: pgsql-sql@postgresql.org
Cc: rabroersma@yahoo.com
Subject: Re: Advice for generalizing trigger functions
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