Re: referential integrity without trigger

On Thu, 9 Feb 2006, Alexander Presber wrote:

> Hello everybody,
>
> Assuming I want to empty and refill table A (with roughly the same
> content, preferrably in one transaction) and don't want to completely
> empty a dependent table B but still keep referential integrity after
> the commit.
>
> Without disabling A's on-delete-trigger B will be be emptied on
> commit, even when I inserted exactly the same data into A that I
> deleted an instant before. That is because the trigger gets called on
> commit, no matter if the deleted rows have "reappeared".
>
> If I disable the trigger, My referential integrity is most likely
> corrupted.
> Is there a clever, general scheme to "recheck" and enforce foreign
> key contraints, after the responsible triggers have been disabled and
> reenabled?

Probably the easiest way to do these things is to drop the constraint
before, do stuff and re-add the constraint since that will check the
constraint at the add constraint time.