Re: Next number processing

PreparedStatement ps  =  connection.prepareStatement(
       "insert into trash.test (testfield) values(?)",
       PreparedStatement.RETURN_GENERATED_KEYS);

if (rs.next()) {
  id = rs.getInt(1);
}

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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;
 }

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