Re: PostgreSQL and PHP persistent connections

From: Peter Mount <peter(at)retep(dot)org(dot)uk>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, "Thies C(dot) Arntzen" <thies(at)digicol(dot)de>
Cc: pgsql-jdbc(at)postgresql(dot)org, PostgreSQL-interfaces <pgsql-interfaces(at)postgresql(dot)org>
Subject: Re: PostgreSQL and PHP persistent connections
Date: 2001-02-07 21:41:43
Message-ID: 5.0.2.1.0.20010207214024.009ee160@mail.retep.org.uk
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-interfaces pgsql-jdbc

At 14:12 07/02/01 -0500, Bruce Momjian wrote:
>Thies, we talked at LinuxWorld about improving the reliability of
>persistent PostgreSQL connections in PHP.
>
>I believe the problem is that persistent connections sometime do not
>pass clean sessions because of open transactions and SET changes to the
>session.
>
>We discussed using 'ROLLBACK' before passing a connection to a new user,
>but the problem was that ROLLBACK with no open transaction causes a
>server log error message. We discussed adding 'ROLLBACK SILENT' to fix
>this, but I believe a better, more portable solution is a simple "BEGIN
>WORK;ROLLBACK". This will do nothing if there is no open transaction,
>and will ROLLBACK any open transaction. I propose this be sent by PHP
>as the first query when passing persistent connections.
>
>As far as SET changes, does anyone on the PostgreSQL interfaces list
>have a suggestion on how to RESET all session parameters? Seems we may
>need to add this feature in to the backend.

Some Java apps utilise connection pools so they would possibly benefit. I
could add the BEGIN WORK;ROLLBACK; to JDBC.

Peter

In response to

Responses

Browse pgsql-interfaces by date

  From Date Subject
Next Message Tom Lane 2001-02-07 21:42:08 Re: [INTERFACES] pgAccess fails to launch on HPUX
Previous Message Peter Mount 2001-02-07 21:37:32 Re:

Browse pgsql-jdbc by date

  From Date Subject
Next Message Peter Mount 2001-02-07 22:07:28 Re: PostgreSQL and PHP persistent connections
Previous Message Bruce Momjian 2001-02-07 20:50:53 Re: PostgreSQL and PHP persistent connections