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Sorry.... just came to me what the problem (probably) is... you are required to specify "FOR UPDATE" on statements that are updatable. This tells the database that we are potentially going to escalate locks later. Creating the statement as updatable only tells the JDBC driver that you want access to update methods. While it is true that the JDBC driver could add the "FOR UPDATE" clause for users, and perhaps we should. Generally, we try to stay away from doing any modification to the user SQL that comes through because its always more dangerous than it first appears. For example, if the user passes an SQL string, first you have to check to see if the clause is there. Then you have to make sure that the "FOR UPDATE" clause isn't going to interfere when any other clause that the user might already have (like "OPTIMIZE FOR x ROWS"). Then you have to consider all the things that I have not just considered. :) What do people think? Should the JDBC driver check for this clause and append it if missing? 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 02/05/2001 02:20:55 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 Richard, I got the native driver on AS/400 running. But the update result set was still failed. The message was: SQLException: [IBM][JDBC Driver][15046] An attempt was made to issue an update method on a result set that is not updatable. SQLState: 24000 I don't know why the resultSet is not updatable. I have specifically defined the statement as: stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); rs = stmt.executeQuery(myQuery); Any suggestions? Is anyone have ever use JDBC2.0 API updating a result set programmatically? Wayne -----Original Message----- From: Richard Dettinger [mailto:cujo@us.ibm.com] Sent: Monday, February 05, 2001 11:40 AM To: JAVA400-L@midrange.com Subject: RE: Updating result set in Java This should help: 1) The native JDBC driver is not in the classpath be default with JDK 1.2 and beyond. The following CL command will put the Native JDBC driver in your extensions classpath and then you won't have to worry about it again: ADDLNK OBJ('/QIBM/ProdData/Java400/ext/db2_classes.jar') NEWLNK ('/QIBM/UserData/Java400/ext/db2_classes.jar') Of course, you can just add it to your classpath if you want. That will fix the no suitable driver messages. 2) To the best of my knowledge, the native JDBC jar file is not in VisualAge anywhere. You can always take the jar file noted above and put it in VisualAge but for most purposes, this isn't really needed because you would already be coding to the JDBC API interface. 3) You can't run the native JDBC driver from a system that is not a 400 (iSeries). This is because it is tied directly into the database and the JVM. You can connect from one 400 to another 400 or from one 400 to a different backend (such as a 390) over DRDA, but you can't have your 'client' not be an AS/400 or iSeries. 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 02/05/2001 10:08:19 AM 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 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 +--- +--- | 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 +--- +--- | 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 +---
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