Thread: Re: [GENERAL] getting the oid for a new tuple in a BEFORE trigger

> we need to control database changes within BEFORE triggers.
> There is no problem with triggers called by update, but there is
> a problem with triggers called by insert.
>
> We strongly need to know the oid of a newly inserted tuple.
> In this case, we use tg_newtuple of the TriggerData structure
> passed to thetrigger function, and its t_data -> t_oid will
> have the value '0'.
>
> Using BEFORE and AFTER triggers would make our lives much harder.
>
> Is there any way (even hack) to get the oid the newly
> inserted tuple will receive?

Just set t_data->t_oid = newoid() - this is what backend does
in heapam.c:heap_insert().

Vadim

> > we need to control database changes within BEFORE triggers.
> > There is no problem with triggers called by update, but there is
> > a problem with triggers called by insert.
> >
> > We strongly need to know the oid of a newly inserted tuple.
> > In this case, we use tg_newtuple of the TriggerData structure
> > passed to thetrigger function, and its t_data -> t_oid will
> > have the value '0'.
> >
> > Using BEFORE and AFTER triggers would make our lives much harder.
> >
> > Is there any way (even hack) to get the oid the newly
> > inserted tuple will receive?
>
> Just set t_data->t_oid = newoid() - this is what backend does
> in heapam.c:heap_insert().

Does that work?  Doesn't that get overwritten when the actual INSERT
happens?

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