fail-safe sql update triggers

I want to log all activity from a table to a old_table. Creating an ON INSERT trigger is simple, it just needs to

INSERT INTO old_filter SELECT NEW.*;

in a procedure that is called via the trigger. But what about updates? There is no simple

UPDATE old_filter SET NEW.* WHERE id=NEW.id;

so I would need to declare each column like

UPDATE old_filter SET field1=NEW.field1,f2=NEW.f2,.... where id=NEW.id;

But that is error prone, because when the "filter" table is changed to have a new column, the UPDATE statement would
notcontain it. Is there a fail-proof shortcut? 


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Michael Monnerie, Ing. BSc

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