Re: Getting "This ResultSet is closed" exceptions - Mailing list pgsql-jdbc

From Dave Cramer
Subject Re: Getting "This ResultSet is closed" exceptions
Date
Msg-id 90F06A2B-BCAD-4556-9CD6-7B05192AC9E6@fastcrypt.com
Whole thread Raw
In response to Re: Getting "This ResultSet is closed" exceptions  ("Paul Tomblin" <ptomblin@gmail.com>)
List pgsql-jdbc
On 18-Feb-08, at 2:48 PM, Paul Tomblin wrote:

> On Feb 18, 2008 2:10 PM, Andres Olarte <olarte.andres@gmail.com>
> wrote:
>> You might go for using a single connection per thread.  Works for me.
>
> Forgive a possibly stupid question, but how would a class know whether
> there is a Connection for this thread already?  I use a simple static
> to hold the Connection, and so I get one for the whole program.  But
> there is a lot of asynchronous stuff going on with GUI callbacks,
> external "messages" and RMI calls, etc.  Do I have to create and
> destroy a connection in every callback, or use some sort of thread
> pooling system?  A previous engineer on this project had one subsystem
> that was creating a new database connection every second, and then
> closing it a few milliseconds later - that seems like madness to me.

And it was/is madness. Yes you want  pooling mechanism, and I don't
think a single connection for the whole program is a good thing.
Certainly if you have async callbacks it's very likely you are
stomping on statements.

Dave
>
>
>
> --
> For my assured failures and derelictions I ask pardon beforehand of my
> betters and my equals in my Calling here assembled, praying that in
> the hour of my temptations, weakness and weariness, the memory of this
> my Obligation and of the company before whom it was entered into, may
> return to me to aid, comfort and restrain.
>
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