Well, full disclosure, I'm a contributor to Bitronix. :-) Brett
Sent from my iPhone On Apr 15, 2012, at 20:52, Martin Lichtin <lich...@yahoo.com> wrote: > Thanks Brett and Knut. > Interesting you guys mention Bitronix TM. > I was dealing with Atomikos when this question of a test query came up. > Unlike Bitronix it doesn't support the JDBC4 isValid(). > > -------- Original Message -------- > Subject: Re: Suitable test query for Derby? > From: Knut Anders Hatlen <knut.hat...@oracle.com> > To: Derby Discussion <derby-user@db.apache.org> > Date: 4/13/2012 9:29 PM > >> Martin Lichtin<lich...@yahoo.com> writes: >> >>> Hi >>> Implementations of connection pooling typically use a "test query" to first >>> check >>> whether a connection is still valid before sending the actual query across. >>> A test query looks like >>> SELECT SYSDATE FROM DUAL (eg. PostgreSQL or Oracle) >>> or >>> SELECT 1 (eg. Ingres) >>> >>> What is a suitable test query for Derby? I couldn't find one off-hand. >> >> VALUES 1 would be Derby's equivalent of the Ingres query. Or you could >> use isValid(), as Brett suggested. (If I remember correctly, the client >> driver actually implements isValid() by executing VALUES 1 on the >> server.) >>
