Received: from localhost (postgresql.org [64.49.215.8])
	by postgresql.org (Postfix) with ESMTP
	id 34CE947603D; Fri,  4 Oct 2002 22:54:22 -0400 (EDT)
Received: from sss.pgh.pa.us (unknown [192.204.191.242])
	by postgresql.org (Postfix) with ESMTP
	id 92164476032; Fri,  4 Oct 2002 22:54:21 -0400 (EDT)
Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1])
	by sss.pgh.pa.us (8.12.5/8.12.5) with ESMTP id g952s2hR000265;
	Fri, 4 Oct 2002 22:54:03 -0400 (EDT)
To: =?ISO-8859-1?Q?Crist=F3v=E3o_Dalla_Costa?= <cbraga@bsi.com.br>
Cc: pgsql-general@postgresql.org, pgsql-interfaces@postgresql.org
Subject: Re: LISTEN/NOTIFY 
In-reply-to: <3D9DFEF3.6020509@bsi.com.br> 
References: <3D9DFEF3.6020509@bsi.com.br>
Comments: In-reply-to =?ISO-8859-1?Q?Crist=F3v=E3o_Dalla_Costa?=
	<cbraga@bsi.com.br> message dated "Fri, 04 Oct 2002 17:49:55 -0300"
Date: Fri, 04 Oct 2002 22:54:02 -0400
Message-ID: <264.1033786442@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
X-Virus-Scanned: by AMaViS new-20020517
X-Archive-Number: 200210/290
X-Sequence-Number: 31288

=?ISO-8859-1?Q?Crist=F3v=E3o_Dalla_Costa?= <cbraga@bsi.com.br> writes:
> I'm developing an e-commerce site using Apache/mod_perl and, for 
> performance, I intend to cache rows such as user and product information 
> inside Perl. I think the LISTEN/NOTIFY interface would be perfect for 
> invalidating the cache when a product/user gets updated, yet I have not 
> found a way to access it from Perl -- DBI, or DBD::Pg even, offer no way 
> to "listen".

I don't know what the DBI/DBD design philosophy is regarding
database-specific extensions --- but it would seem reasonable to me
for DBD::Pg to offer some way to get at LISTEN functionality.  Can
anyone suggest how to do this in the context of DBI?

I suggest moving any followups to pgsql-interfaces, where this
discussion would be more on-topic.

			regards, tom lane