Обсуждение: Is there a way to know if trigger is invoked by the code from another trigger

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Is there a way to know if trigger is invoked by the code from another trigger

От
"Naoko Reeves"
Дата:

Could you tell me if there is a way to know if trigger is invoked by the code from another trigger?

For instance, table A Trigger deletes table B record. While in table B trigger, I want to know whether this was triggered from table A.

 

Thank you,

Naoko

 

Re: Is there a way to know if trigger is invoked by the code from another trigger

От
Erik Jones
Дата:
On Oct 11, 2009, at 10:51 AM, Naoko Reeves wrote:

> Could you tell me if there is a way to know if trigger is invoked by
> the code from another trigger?
> For instance, table A Trigger deletes table B record. While in table
> B trigger, I want to know whether this was triggered from table A.

Nothing built in to show you that.  You could, however, have your
trigger on table A make an insert or update to a record in some table
that the trigger on table B could then look for.

Erik Jones, Database Administrator
Engine Yard
Support, Scalability, Reliability
866.518.9273 x 260
Location: US/Pacific
IRC: mage2k

Re: Is there a way to know if trigger is invoked by the code from another trigger

От
Craig Ringer
Дата:
On Mon, 2009-10-12 at 10:36 -0700, Erik Jones wrote:
> On Oct 11, 2009, at 10:51 AM, Naoko Reeves wrote:
>
> > Could you tell me if there is a way to know if trigger is invoked by
> > the code from another trigger?
> > For instance, table A Trigger deletes table B record. While in table
> > B trigger, I want to know whether this was triggered from table A.
>
> Nothing built in to show you that.  You could, however, have your
> trigger on table A make an insert or update to a record in some table
> that the trigger on table B could then look for.

This is one of those places where transaction-scoped variables would be
really, really nice; a temp table is a bit of a clumsy way to do things.

--
Craig Ringer