RE: Updating result set in Java -- JAVA400-L

Title: RE: Updating result set in Java

Thanks, Richard.

As you suggested, I am running the program on AS/400 by using DB2 native JDBC driver. Now I got other problems on AS/400. I have multiple JDKs on the AS400. In order to use the JDBC 2.0 API, I have to use JDK 1.2. But I got "no suitable driver" message. I have no problem to load the driver if I run the program using JDK1.1.8, of course in this case all JDBC2.0 API methods will not be recognized. Does AS400 Developer Kit for Java only support JDK1.1.8? Do I miss something here?

By the way, I tried to run the db2 JDBC native driver inside VisualAge for JAVA 3.5. But the program can not find the driver. Do you know where is the package "com.ibm.db2.jdbc.app" inside the IDE. I have no problem to use the native driver on AS400 (for JDK1.1.8). What I understood is that on AS400 I am using AS/400 Developer Kit for Java, how about inside VisualAge?

I do have write authority to the table. In fact, I can use SQL statement to update the ID field of the TEST table. The code looks like this:

        String myUpdate = "update TEST set ID = RRN(TEST)+30";
        stmt = con.createStatement();
        stmt.executeUpdate(myUpdate);

Thanks.

-----Original Message-----
From: Richard Dettinger [mailto:cujo@us.ibm.com]
Sent: Monday, February 05, 2001 9:11 AM
To: JAVA400-L@midrange.com
Subject: RE: Updating result set in Java

You don't have write authority to the table??? No, I don't have another
guess.

Export your program to the 400 and use the Native JDBC driver to see if the
problem is the same.
If the problem is the same, the issue is likely to be something about the
database (either setup
or a bug). If it works that way, its likely to be a Toolbox JDBC driver
issue which should be investigated.

Regards,

Richard D. Dettinger
AS/400 Java Data Access Team

"Biologists have a special word for stability -- dead"

                Larry Wall
                Open Source Developers Journal
                Issue 1, Jan 2000

"Xu, Weining" <Weining.Xu@AIG.com>@midrange.com on 02/02/2001 03:52:00 PM

Please respond to JAVA400-L@midrange.com

Sent by: owner-java400-l@midrange.com

To: "'JAVA400-L@midrange.com'" <JAVA400-L@midrange.com>
cc:
Subject: RE: Updating result set in Java

rs.next() did return true.� The code was simplified. I do use while
(rs.next()) in my real code.

any other thought??

-----Original Message-----
From: Richard Dettinger [mailto:cujo@us.ibm.com]
Sent: Friday, February 02, 2001 4:23 PM
To: JAVA400-L@midrange.com
Subject: Re: Updating result set in Java

Are you sure the call to rs.next() returned true?� If you don't test the
boolean return value, the resultset could have been empty.� That's my
first, best guess.

Of course, you can write code however you want, but I always make it a
practice to use while(rs.next())� if I am going to process all the rows and
if (rs.next()) if I want to process only one.� This ensures that there is
always data before I go off and try to do something to the ResultSet.

Regards,

Richard D. Dettinger
AS/400 Java Data Access Team

"Biologists have a special word for stability -- dead"

�� Larry Wall
�� Open Source Developers Journal
�� Issue 1, Jan� 2000

"Xu, Weining" <Weining.Xu@AIG.com>@midrange.com on 02/02/2001 02:29:04 PM

Please respond to JAVA400-L@midrange.com

Sent by:� owner-java400-l@midrange.com

To:�� "'JAVA400-L@midrange.com'" <JAVA400-L@midrange.com>
cc:
Subject:� Updating result set in Java

I have problem to update the result set programmatically. I use VisualAge
for Java 3.5 Enterprise Edition. My database is DB2 in AS/400.� I am using
JDBC 2.0 API features to update the field in the result set.� I got error
message:

SQLException: Cursor state not valid.
SQLState:� 24000

Here is my sample code:

import java.sql.*;
import com.ibm.as400.access.*;

class Test {

public static void main(java.lang.String[] args) {
�� Connection con = null;
�� Statement stmt = null;
�� ResultSet rs = null;

�� // Load Java JDBC driver.
�� try {

�� Class.forName("com.ibm.as400.access.AS400JDBCDriver");
�� } catch(java.lang.ClassNotFoundException e) {
�� System.err.print("ClassNotFoundException: "+e.getMessage
());
�� }
�� try {

�� con = DriverManager.getConnection
("jdbc:as400://wilm620/agtcomp", "myID", "mypassword");
�� } catch (SQLException e){
�� System.err.println("Connection Error Exception: "
+e.getMessage());
�� }

�� try{
�� stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
�� rs = stmt.executeQuery("select ID from AGTCOMP.TEST");

�� //move the cursor to the first row and update the ID field
(Integer) to 30.
�� rs.next();
�� rs.updateInt(1,30);

�� stmt.close();
�� con.close();
�� }catch (SQLException e){
�� System.err.println("SQLException: "+e.getMessage());
�� System.err.println("SQLState:� "+e.getSQLState());
�� }

�� System.exit(0);
}
}

I have tried to scroll the result set up and down, there is no problem to
do that. But I just cannot update it. Of course I can not do rs.updateRow()
to update the row in the database either.

Any helps will be highly appreciated.

Weining (Wayne) Xu
Phone: +302.594.2846
Email:�� weining.xu@aig.com

+---
| 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
+---