[Pljava-dev] Cancelling trigger operation

Hi Filip,
Something is definitely missing in the TriggerData interface. It should
have a 'setCancelled()' method that causes the returned tuple to be
null. Please add a bug for this.

Regards,
Thomas Hallgren

Filip Hrbek wrote:
> Hi Thomas,
>
> when a trigger function is written in pl/pgsql, you can decide to cancel the
> operation in a trigger(defined as "before event") by returning null instead
> of "new", e.g.
>
> create function cancelling_trigger() returns trigger as
> '
> begin
> if new.num < 0 then
> -- cancel operation for negative numbers
> return null;
> else
> -- continue
> -- do something...
> return new;
> end if;
> end
> ' language 'plpgsql';
>
> Is there any way to do the same in pljava? I can't see it now, since the
> trigger functions are mapped to static java methods with no return values
> (void):
>
> public static void cancellingTrigger(TriggerData td) throws SQLException {
> if (td.getNew().getInt("num") < 0) {
> //Cancel operation - HOW???
> }
> else {
> //Continue
> //do something...
> }
> }
>
> Filip
>
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