Re: [PHP-DEV] Re: Re: PostgreSQL and PHP persistent connections

Any reasons there could't be either more statuses for a connection besides
CONNECTION_BAD, CONNECTION_OK, or alternativetely, a new libpq function
that could tell us READY_TO_RECEIVE_MORE_SQL_COMMANDS,
PREVIOUS_TRANSACTION_ABORTED_UNTIL_..., etc. (Sorry that I'm shouting... I
just write constant names that way like everyone else.)

-- Jouni

On Mon, 12 Feb 2001, Bruce Momjian wrote:

> > > 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.
> >
> > i'll have a look at that tomorrow (if my family allows;-). if
> > "BEGIN WORK;ROLLBACK" does not stack transactions i think you
> > might have found the solution to the php-postgres problem! do
>
> If we every get nested transactions, this will no longer work, but we
> don't have them, and will not for a while.
>
> > you know how other script-interfaces (perl) to postgres
> > handle the very same thing?
>
> They don't handle them, but our Java interface just added this feature.
>
>
> > > 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.
> >
> > with the oracle driver (i wrote) there is a neat thing in the
> > oci-libs: you have a server-handle _and_ a session handle.
> > the session handle sits "on" the server-handle and keeps
> > _all_ session specific data, the server handle "only" carries
> > the pure connection to oracle. so i keep the server handle
> > persistent and allocate/free session handles on it for each
> > request to PHP. that way the sessions are always clean. but i
> > also do a forces rollback on the session handle before i free
> > it on request-end so that in case of a script error all
> > outstanding transactions are rolled-back.
>
> Yes, it would be nice if we had that feature.
>
> --
> Bruce Momjian | http://candle.pha.pa.us
> pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
> + If your life is a hard drive, | 830 Blythe Avenue
> + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
>
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