On Wed, 2010-06-16 at 10:26 +0600, Anton Maksimenkov wrote:
> if ((res = PQgetResult(conn)) == NULL) {
> fprintf(stderr, "PQgetResult() res == NULL");
> PQfinish(conn);
> return -1;
> }
> if (PQresultStatus(res) != PGRES_TUPLES_OK) {
> fprintf(stderr, "PQgetResult() failed: %s",
> PQerrorMessage(conn));
> PQclear(res);
> PQfinish(conn);
> return -1;
> }
>
> SECOND: PQsendQueryPrepared() failed: another command is already in progress
>
> Where I was wrong?
>
You need to call PQgetResult() again. From the docs
http://www.postgresql.org/docs/9.0/static/libpq-async.html :
"PQgetResult must be called repeatedly until it returns a null pointer,
indicating that the command is done."
After you get a NULL back from PQgetResult, you can execute another
command.
>
> And another question. Is it possible to simultaneously keep a number
> of prepared queries and run any of them from time to time?
Yes, although a prepared query lasts only as long as the connection.
When you disconnect and reconnect, you will need to prepare them again.
Regards,
Jeff Davis
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