Re: how to tell if a tuple has been inserted in current transaction

On Thu, May 3, 2012 at 8:50 AM, pg noob <pgnube(at)gmail(dot)com> wrote:
>
> Hi all,
>
> I have a trigger function which is getting invoked on insert/update and
> within that trigger I would like to know if some tuple, from a different
> table referenced by foreign key constraint from the table with the trigger
> on it, was inserted within the same transaction as the insert/update that
> caused the trigger to fire.
>
> I found that I can tell if the foreign tuple was inserted or updated by
> checking if its xmin == select txid_current(), but there doesn't appear to
> be any way to know if it was modified because of an INSERT or an UPDATE.  I
> would like to distinguish between whether it was an insert or update that
> caused the row to be modified.  Is this possible?

just put a trigger on that table and scribble TG_OP into a field
reserved for that...

merlin