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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:

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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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