Re: Problems Caching and reusing JDBC CallableStatement objects

Hmm... I think that should all work, but we have run into a couple issues
recently with our parameter support.  Please ensure that you are pretty up
to date on your v4r4 PTFs, and try again after getting the latest if you
are not.

If the problem persists, please try to find the simplest example that you
can recreate the problem in and e-mail it to me directly.  I will figure
out what is going on and get back to you and/or the group as appropriate.
Thanks.

Regards,

Richard D. Dettinger
AS/400 Java Data Access Team

"TRUE! nervous, very, very dreadfully nervous I had been and am; but why
WILL you say that I am mad?
The disease had sharpened my senses, not destroyed, not dulled them. "

- Edgar Allan Poe
"The Tell-Tale Heart"




"Al Heitkamp" <Al.Heitkamp@hbfuller.com> on 07/14/2000 09:40:48 AM

Please respond to JAVA400-L@midrange.com

To:   JAVA400-L@midrange.com
cc:
Subject:  Problems Caching and reusing JDBC CallableStatement objects




I have written an application that runs on the AS/400 and calls stored
procedures using JDBC driver com.ibm.db2.jdbc.app.DB2Driver. My first
release of the application created a new CallableStatement object each time
I called a stored procedure. This has been working fine for some time now.

In an attempt to improve performance, I modified the application to cache
the CallableStatement objects for each different stored procedure call,
then reusing the CallableStatement object for subsequent stored procedure
calls.  I am now getting the error *Conversion error on input host variable
or parameter *N.* I returned to creating the new CallableStatement for
every stored procedure call and the application works fine again. Caching
the CallableStatements works fine against an Oracle database and improved
performance by almost 10 percent.

Has anyone seen this problem before?  We are running V4R4 and JDK 1.1.7.

Thanks,

Al Heitkamp
H.B. Fuller Company
Arden Hills, MN



+---
| This is the JAVA/400 Mailing List!
| To submit a new message, send your mail to JAVA400-L@midrange.com.
| To subscribe to this list send email to JAVA400-L-SUB@midrange.com.
| To unsubscribe from this list send email to JAVA400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner: joe@zappie.net
+---



+---
| This is the JAVA/400 Mailing List!
| To submit a new message, send your mail to JAVA400-L@midrange.com.
| To subscribe to this list send email to JAVA400-L-SUB@midrange.com.
| To unsubscribe from this list send email to JAVA400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner: joe@zappie.net
+---