Re: Postgres 8.3.5 - ECPG and the use of descriptors and cursors in multi-threaded programs

From: Bosco Rama <postgres(at)boscorama(dot)com>
To: Leif Jensen <leif(at)crysberg(dot)dk>
Cc: pgsql-general <pgsql-general(at)postgresql(dot)org>
Subject: Re: Postgres 8.3.5 - ECPG and the use of descriptors and cursors in multi-threaded programs
Date: 2011-05-25 16:33:38
Message-ID: 4DDD2F62.7000405@boscorama.com
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Leif Jensen wrote:
>
> Is it really not possible to use 2 separate connection within 1 thread
> at the same time ? or is it an error in the ecpg library ?

It should be entirely possible to run multiple connections in a single
thread as long as you manage the 'AT connName' clauses properly.

Though, IIRC, using an 'AT connName' clause on any sort of 'deallocate'
statement generates an error in ecpg:

ecpg -o test.c test.pgc
test.pgc:35: ERROR: AT option not allowed in DEALLOCATE statement

This happens when trying to deallocate a query or a prepared statement.
I don't use descriptors but the error message indicates it's _any_ sort
of deallocate.

So, it would appear that you can allocate on a connection but not
deallocate from one. :-(

I'm wonder if Tom or Michael can shine some light on this one?

Bosco.

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