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Re: currval bug??

From: Kris Jurka <books(at)ejurka(dot)com>
To: Gabriele Carteni <gabriele(dot)carteni(at)unile(dot)it>
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: currval bug??
Date: 2004-12-21 18:48:45
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-jdbc

On Tue, 21 Dec 2004, Gabriele Carteni wrote:

> Hi all,
> i have recently upgraded my development environment:
> FROM postgresql 7.4 TO postgresql 8.0beta5
> FROM jdk1.4 TO jdk1.5
> FROM pg74.215.jdbc3.jar TO pg80b1.308.jdbc3.jar
> now, i have a FRUSTRATING bug:
> With this query (which works fine with previous pg74jdbc):
> *insert into tablename (fieldname) values ('testvalue');select 
> currval('tablename_id_seq');*
> *org.postgresql.util.PSQLException: No results were returned by the query.*
> Obviously the query has to return a result.

The 7.4 driver sends the whole query string together to the backend and 
gets a result.  The 8.0 driver splits the query into two and sends them 
individually.  This is required to use the V3 extended query protocol.  
When it gets the result from the first part it is expecting a result and 
isn't getting one.  I'm not sure if this should be an error or not, in 
general mashing queries together isn't a great idea.  Perhaps you should 
be using Statement.execute() and then iterating through any/all results 

Kris Jurka

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