Re: Functions and Triggers

Cedar Cox wrote:
>
> CREATE FUNCTION lastupdated() RETURNS opaque AS '
> begin
> new.last_updated := CURRENT_TIMESTAMP;
> return new;
> end;
> ' LANGUAGE 'plpgsql';
>
> CREATE TRIGGER trigname BEFORE INSERT OR UPDATE on tblname
> FOR EACH ROW EXECUTE PROCEDURE lastupdated();
>
> Note: you could use now() instead of CURRENT_TIMESTAMP
>
> Note2: on a BEFORE trigger you must return new or old. If you return null
> the statement will be aborted. (?)

If you return NULL from a BEFORE trigger the action on that
particular row will be silently suppressed.

Jan

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