Re: dataSource.getConnection jt400 -- JAVA400-L

Joe Sam

Thanks for the help and the tips. I will change the class accordingly. Let me know if you publish an article on this. I will definitely check it out.

Rock on, PLA

Joe Sam Shirah wrote:

Hi,

Did you see my previous email I sent with the source to my new ToolboxDataSource class? How does that look? It works great so far.


   It came in as my last one went out.  Then I had to do some work for
those pesky clients, since I have to eat occasionally.

   I would have done it a little differently, but it looks like this should
work OK for your needs.  If I get the time, I may do a short article about
it off conceptGO's community page or elsewhere.  A couple of things:

   I would be sure that your documentation specifies that your
ToolboxDataSource is a connection pooler.  Normally, you would not want
regular apps to use it unless there were multiple threads doing lots of work
with ( relatively ) short lived connections.

You should also override

getConnection(java.lang.String user, java.lang.String password)

probably to throw an exception.  Otherwise, a user could call it on your
AS400JDBCConnectionPoolDataSource ( remember, they extended it from
AS400JDBCDataSource ) and get a non-pooled, non-managed connection.

   Finally, this is not really a work around, but the sort of thing that
actually has to be done, even with a JNDI obtained pool managed DataSource.
It's just all hidden from you there.  And, it's not peculiar to JTOpen,
although some things, like the co-mingling of the DataSource and
ConnectionPoolDataSource interfaces in the AS400JDBCConnectionPoolDataSource
implementation, certainly are.

   Anyhow, I'm glad you were able to resolve the issue.  I think it was a
useful discussion for the list because some of this is not at all obvious,
and I hope no one was bored,  Best,

Joe Sam

Joe Sam Shirah -        http://www.conceptgo.com
conceptGO         -        Consulting/Development/Outsourcing
Java Filter Forum:       http://www.ibm.com/developerworks/java/
Just the JDBC FAQs: http://www.jguru.com/faq/JDBC
Going International?    http://www.jguru.com/faq/I18N
Que Java400?             http://www.jguru.com/faq/Java400


----- Original Message -----
From: "Patrick L Archibald" <Patrick.Archibald@xxxxxxxxxxxxx>
To: "Java Programming on and around the iSeries / AS400"
<java400-l@xxxxxxxxxxxx>
Sent: Tuesday, July 29, 2003 6:20 PM
Subject: Re: dataSource.getConnection jt400

Here is my work around. I created a class called ToolboxDataSource that
extends the AS400JDBCConnectionPool.

package com.hometelco.intranet;
import java.sql.*;
import com.ibm.as400.access.*;
/**
* @author     Patrick L Archibald
* @created    July 29, 2003
*/
public class ToolboxDataSource extends AS400JDBCConnectionPoolDataSource {
 AS400JDBCConnectionPool pool = null;
 private String system;
 private String user;
 private String password;
 public ToolboxDataSource(String system, String user, String password) {
   super(system, user, password);
   this.system = system;
   this.user = user;
   this.password = password;
 }
 public Connection getConnection() throws SQLException {
   Connection connection = null;
   if (pool == null) {
     System.out.println("Get pool. Date: " + new java.util.Date());
     AS400JDBCConnectionPoolDataSource test = new
AS400JDBCConnectionPoolDataSource(system, user, password);
     pool = new AS400JDBCConnectionPool(test);
     try {
       pool.fill(5);
     }
     catch (ConnectionPoolException e) {
       System.out.println("ConnectionPoolException");
     }
   }
   try {
     connection = pool.getConnection();
   }
   catch (ConnectionPoolException e) {
     System.out.println("ConnectionPoolException");
   }
   return connection;
 }
}

Thanx, PLA

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