Message-ID: <45053B0F.5020109@logix-tt.com>
Date: Mon, 11 Sep 2006 12:31:43 +0200
From: Markus Schaber <schabi@logix-tt.com>
Organization: Logical Tracking and Tracing International AG, Switzerland
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To: pgsql-sql@postgresql.org
Subject: Re: on connect/on disconnect
References: <4504B474.9010801@cs.anu.edu.au>
In-Reply-To: <4504B474.9010801@cs.anu.edu.au>
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Hi, Robert,

Robert Edwards wrote:
> (this is my first post to this list...)

Welcome here. :-)

> I am wondering if Postgres, and/or SQL in general, has a facility to
> run a function at connection set-up time (after a successful connection
> attempt) and/or at session completion (or disconnect)?

Most JDBC connection pooling implementations will do that, at least for
connection and session setup. (JBoss is one of them.)

> I want to pre-populate a table (actually an INSERT rule on a view)
> with some user-specific data that is unlikely to change during the
> session and which is "difficult" to process (ie. affects performance
> to do it too often).

The problem here is that the INSERT rule might be globally visible to
other, concurrent users on the database.

Could you explain what exactly you want to achieve, may be we find a
better way to do the whole thing.

> Purely session/connection-based temporary tables would also do what
> I need, but temporary tables don't seem to be able to work that way.

What's the exact problem with them?

Markus
-- 
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf.     | Software Development GIS

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