Re: Questions and experiences writing a Foreign Data Wrapper

On Wed, Jul 20, 2011 at 08:26:19PM +0300, Heikki Linnakangas wrote:
> On 20.07.2011 18:00, Albe Laurenz wrote:
> >2) If I decide to close remote database connections after
> >    use, I would like to do so where reasonable.
> >    I would like to keep the connection open between query
> >    planning and query execution and close it when the
> >    scan is done.
> >    The exception could be named prepared statements.
> >    Is there a way to tell if that is the case during
> >    planing or execution?
> 
> Hmm, maybe you could add a hook to close the connection when the
> transaction ends. But actually, you'd want to keep the connection
> open across transactions too. Some sort of a general connection
> caching facility would be useful for many FDW.

For what it's worth, DBI-Link caches FDW handles in perl session
variables.  I didn't really consider cross-session handle caching
because the complexity would have been large and the benefit small.

Cheers,
David.
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