From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Oliver Jowett <oliver(at)opencloud(dot)com> |
Cc: | Kris Jurka <books(at)ejurka(dot)com>, Hans-Jürgen Schönig <postgres(at)cybertec(dot)at>, eg(at)cybertec(dot)at, pgsql-patches(at)postgresql(dot)org |
Subject: | Re: Implementing RESET CONNECTION ... |
Date: | 2005-01-04 01:27:44 |
Message-ID: | 12095.1104802064@sss.pgh.pa.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers pgsql-patches |
Oliver Jowett <oliver(at)opencloud(dot)com> writes:
> Tom Lane wrote:
>> Maybe the RESET CONNECTION command
>> should have an option whether to zap prepared statements or not?
> That doesn't really help the JDBC driver case. The problem is that there
> are prepared statements that have been set up by the driver invisibly to
> the user. Zapping them will make the driver break, and it's too easy for
> the user code to do a full RESET CONNECTION and accidently zap them.
Fair point, but you could make the same argument against *any* side
effect of RESET CONNECTION. You're just complaining about PREPARE
because you can see immediately where that breaks JDBC. Anything that
any driver does to set up per-connection state the way it wants will
be equally vulnerable.
> Having notification of either prepared statement deallocation or
> connection reset (a la ParameterStatus for GUC changes) would help the
> driver to recover from this case.
I'm inclined to think that we'd have to add a protocol message that
reports RESET CONNECTION to really answer objections of this type.
That seems to bring the thing into the category of "stuff that forces
a protocol version bump" :-(
Perhaps RESET CONNECTION should be a protocol-level operation instead
of a SQL command? That would prevent user-level code from causing it
without the driver knowing.
regards, tom lane
From | Date | Subject | |
---|---|---|---|
Next Message | Oliver Jowett | 2005-01-04 01:33:09 | Re: Implementing RESET CONNECTION ... |
Previous Message | Oliver Jowett | 2005-01-04 01:20:44 | Re: Implementing RESET CONNECTION ... |
From | Date | Subject | |
---|---|---|---|
Next Message | Oliver Jowett | 2005-01-04 01:33:09 | Re: Implementing RESET CONNECTION ... |
Previous Message | Oliver Jowett | 2005-01-04 01:25:33 | Re: Implementing RESET CONNECTION ... |