Re: Next number processing -- JAVA400-L

I left out the statement that was used to create the test table. Here it is now:

PreparedStatement ps = connection.prepareStatement( "create table trash.test (id int generated always as identity, testfield char (10))");

Thanx, PLA

Patrick L Archibald wrote:

I use something like this:
ps  =  connection.prepareStatement(
       "insert into trash.test (testfield) values(?)",
       PreparedStatement.RETURN_GENERATED_KEYS);
ps.setString(1, "testdata");

ps.execute();

ResultSet rs = ps.getGeneratedKeys();

int id = 0;
if (rs.next()) {
  id = rs.getInt(1);
}
Thanx, PLA

patrick.odowd@xxxxxxxxxxxxxxxxxxxxxx wrote:
Before acting on this e-mail or opening any attachment, you are advised to read the disclaimer at the end of this mail.

Hi, I have an Event file that has a field called ID as a primary key. ID is an integer, incremented by 1 for each record added.

I am wondering what the options are for retrieving the next sequence number for the event records. At the moment I have a separate file that stores the last event ID used, when a new event record needs to be added I call a static method on a database helper class that returns the next number, code below.

There will only be 1 thread incrementing this event. The volume of events is low, a few per day. It is a batch process.

What I have works but I am wondering if there a better way to do this?
Thanks in advance,
Pat
public static synchronized int getNextNumber(Connection dbConn, String collection, String key) throws JS_Exception { Statement nextNumStm; ResultSet nextNumSet; String nextNumQry; int nextNum = -1;

try { nextNumStm = dbConn.createStatement(); nextNumStm.executeUpdate("UPDATE " + collection + ".MQ_PARM " + "SET INTVALUE = INTVALUE + 1 WHERE ID =" + '\'' + key + '\''); nextNumQry = "SELECT * FROM " + collection + ".MQ_PARM WHERE ID =" + '\'' + key + '\''; nextNumSet = nextNumStm.executeQuery(nextNumQry);
     if (nextNumSet.next()) {
       nextNum = nextNumSet.getInt("INTVALUE");
     }
   }
   catch (SQLException e) {
     JS_Utils.processException(e);
     throw new JS_Exception();
   }
   return nextNum;
 }
********************************************************************** This e-mail is intended solely for the addressee and is strictly confidential. If you are not the addressee, please do not read, print, re-transmit, store or act in reliance on it or any attachments. Instead please e-mail it back to the sender and delete the message from your computer.

E-mail transmission cannot be guaranteed to be secure or error free and The Co-operative Bank accepts no liability for changes made to this e-mail (and any attachments) after it was sent or for viruses arising as a result of this e-mail transmission.

Any unauthorised reproduction, dissemination, copying, disclosure, modification, distribution and/or publication of this e-mail message is strictly prohibited.

The Co-operative Bank reserves the right to intercept any e - mails or other communication for permitted purposes in accordance with the current legislation which you send to, or receive from, any of the employees or agents of the Bank via Bank telecommunication systems. By so corresponding you also give your consent to the Bank monitoring and recording of any correspondence using these systems. The Co-operative Bank p.l.c. is registered in England and Wales, number 990937. The registered office is at PO Box 101, 1, Balloon Street, Manchester, M60 4EP. ********************************************************************** _______________________________________________ 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.
_______________________________________________ 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.