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Re: Proposed archival read only trigger on rows - prevent history modification

From: "Phillip Smith" <phillip(dot)smith(at)weatherbeeta(dot)com(dot)au>
To: <pgsql-sql(at)postgresql(dot)org>
Subject: Re: Proposed archival read only trigger on rows - prevent history modification
Date: 2008-02-22 04:09:11
Message-ID: 014801c87508$ada837d0$9b0014ac@wbaus090 (view raw or flat)
Thread:
Lists: pgsql-sql
On Tuesday 12 February 2008 03:25, Bryce Nesbitt wrote:
> Yes, the view approach has some advantages.  But it still leaves the 
> underlying tables naked to modification. And since the most likely 
> error is... well... me (or another admin) at the SQL prompt, we want 
> underlying tables protected also.

Couldn't you make a row trigger BEFORE UPDATE?

CREATE OR REPLACE FUNCTION readonly_handler()
  RETURNS "trigger" AS
$BODY$
	BEGIN
		IF OLD.read_only = TRUE THEN
			RETURN OLD;
		ELSE
			RETURN NEW;
		END IF;
	END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;


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