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From: "Phillip Smith" <phillip.smith@weatherbeeta.com.au>
To: <pgsql-sql@postgresql.org>
Subject: Re: Proposed archival read only trigger on rows - prevent history
	modification
Date: Fri, 22 Feb 2008 15:09:11 +1100
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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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