[Pgpool-general] Bug when using Pgpool and PQprepare

[Tatsuo Ishii]

Denis,

Thanks for the error report. I was able to reproduce the
problem. Someone made pgpool-II to ignore some packets from
backend. That's the reason why you experience the problem. I don't
know why but apprently it's not good.  I am thinking about how to fix
it but it seems it is harder than I thought. Please give some time...
--
Tatsuo Ishii
SRA OSS, Inc. Japan

> Hi to all.
> 
> I think there is a very odd behaviour of pgpool when using PQprepare,
> PQexecPrepare during a transaction.
> 
> When calling in transaction PQexecPrepare errors are not trapped.
> Postgres executes the prepared statement terminating with an error but
> pgpool does not send the error to the client.
> 
> The problem does not occur when the call to PQexecPrepare is done
> outside of a transaction block.
> 
> I attached sample code test.c that reproduces the bug.
> 
> In order to test it, you must create a sample table in a database named
> "test" like this:
> 
> create table test_table(
>     a integer not null
> );
> 
> I'm using pgpool II 2.2.4 in connection pooling mode (no replication or
> load balance) with postgres 8.2.12.
> The connections are made to pgpool via socket (dir /var/run, port 11271).
> 
> Thank you in advance,
> 
> Doct. Eng. Denis Gasparin
> ---
> Edistar SRL
>