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

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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