Re: BUG #4617: JDBC Drivers 8.2/8.3 return no ResultSet

On Thu, 15 Jan 2009, Raymond L. Naseef wrote:

>
> The following bug has been logged online:
>
> Bug reference:      4617
> PostgreSQL version: 8.3 & 7.4
> Operating system:   FreeBSD
> Description:        JDBC Drivers 8.2/8.3 return no ResultSet
> Details:
>
> Below is query using temporary table instead of "IN" to greatly improve
> performance.  This worked in older JDBC driver, but no longer does.  The
> following were checked, making no difference:
>
> RESULT:
>     org.postgresql.util.PSQLException: No results were returned by the query.
>
>
> QUERY:
> ------
> create temporary table lookup_username (username varchar) on commit drop;
> insert into lookup_username values ('naseef');
> CREATE UNIQUE INDEX lookup_username_idx
> ON lookup_username
> USING btree
> (username);
>
> SELECT enp.username, trim(enp.full_name)
> FROM egr_nis_person as enp
> JOIN lookup_username as lu
> ON lu.username = enp.username
> WHERE enp.start_date < now() + interval '30 seconds'
> AND enp.end_date > now() + interval '30 seconds';
>

What's happening here is that you are actually issuing four commands, not
a single query.  The newer drivers will return a status for each command
executed, and won't just give you the final select result.  For
multi-command statements you should use Statement.execute() and then
getResultSet or getUpdateCount until getMoreResults is false.

Kris Jurka