PostgreSQL and PHP persistent connections

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.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
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