Re: Fwd: Start up question about triggers

> I did some research and can't even find a way to get meta data in a trigger.
>
> In a trigger, is there a way to inspect OLD and NEW to see what columns are
> there and see what has changed? If so, you may not be able to grab the
> actual query but you could create a generic trigger that reconstructs a
> possible update/insert/delete for any table in your database.
>
> Does anyone know of a good place to go get information about using meta data
> in a stored procedure or trigger?

yes.
See the section "User Comments" at the very bottom of Chapter 33 after "Writing Trigger Functions
in C". It is odd that a PL_PGSQL example is given at the end a chapter for triggers written in C.

http://www.postgresql.org/docs/8.1/interactive/trigger-example.html

Also see the entire chapter 36.10 "Trigger Procedures"
http://www.postgresql.org/docs/8.1/interactive/plpgsql-trigger.html

Hope this is what you are looking for.

Regards,

Richard Broersma Jr.