RE: problem multi-threading a stored procedure -- JAVA400-L

I think, in this scenario, the job i.e. qzdasoinit being the same, there
is no uniqueness to the different user.  That perhaps is the reason, the
2nd user gets 1st user's results.   I am still not sure how this should
work, since the 1st user responses will never be picked up or passed by
any job unless you introduce another control that tracks the user and
sends the result back to the cookies or user session or something.  Also
what if the same user signs in 2 different sessions?

When we came across the design issue, we used a different job for
different user, however when the user is signed on, all requests from
that user will pass through the same thread.  This eliminated the
mix-up.  This worked out ok for us though. 

But I believe there is a 3rd party plug-in that can handle same thread
to be used for different users since it keeps track of the user signed
in, somehow.  

Thanks,
Sudha

-----Original Message-----
From: TitanRebel [mailto:TitanRebel@xxxxxxxxxxx] 
Sent: Friday, March 07, 2003 1:24 PM
To: java400-l@xxxxxxxxxxxx
Subject: problem multi-threading a stored procedure

I am having a problem with a stored procedure.  Hopefully, someone has 
experience with this.  Here is my environment.

- Jakarta Tomcat 4.0.4 running on iSeries.
- Servlet calls a stored procedure to get list of results.
- Stored Procedure is written in RPG, running on same iSeries.

Everything works great when there are not simultanious requests to the 
same Stored Procedure.  If two users request the results at 
approximately the same time, one of them doesn't get any results.  From 
what I can tell, the second person to request the results get the 
results, and the first person gets none.

I have verified that the Servlet (as expected) is being executed in two 
seperate threads.  The Connection and the CallableStatement are declared

as fields (class level variables).  The ResultSet is a local variable 
that immediately gets turned into an ArrayList which is passed to a JSP 
page for display.  So, I am using the same Connection for every user, 
and calling the "executeQuery()" method on the same CallableStatement.

Can anyone see what is wrong?  My guess is that this connection is being

serviced by the same QZDASOINIT prestart job, therefore it is 
technically the same job that is calling the Stored Procedure each time,

and that is why it can't handle multi-threading.  Does anyone know how 
to get around this?  Should I create a seperate Connection object for 
each user?  That seems ineffecient.

_______________________________________________
This is the Java Programming on and around the iSeries / AS400
(JAVA400-L) mailing list
To post a message email: JAVA400-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/java400-l
or email: JAVA400-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/java400-l.