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Re: Get current query in a trigger function

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Vlad Arkhipov <arhipov(at)dc(dot)baikal(dot)ru>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Get current query in a trigger function
Date: 2013-01-15 19:55:34
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Lists: pgsql-hackers
On Mon, Jan 14, 2013 at 9:38 PM, Vlad Arkhipov <arhipov(at)dc(dot)baikal(dot)ru> wrote:
>>> Is there any simple way of getting a query for which a trigger was
>>> executed?
>>> debug_query_string and ActivePortal->sourceText return the top query when
>>> there are nested triggers.
>> I believe - only if the trigger is written in C.
> Yes, the trigger is written in C. But I didn't find any way to get access to
> the current EState or QueryDesc from a trigger function. The only common
> place of a trigger and the corresponding EState/QueryDesc structs seems to
> be CurrentMemoryContext in a trigger function, which ancestor has to be (?)
> EState->es_query_cxt. It's an ugly solution of course.

Ah, I see.  Yeah, I don't know of a good way to do that, although
there may be one.

> P.S. Is it a mistype EState->es_query_cxt? Should it be es_query_ctx?

I don't see why either of those is particularly better than the other.
 "context" has a t both before and after the x.


Robert Haas
The Enterprise PostgreSQL Company

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