Re: Updating result set in Java

["Richard Dettinger" <cujo@xxxxxxxxxx>]

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




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