// Let's try DaoHelperForJndi, which creates
  // PreparedStatement from JNDI DataSource.
  // JNDI DataSource name must be available as the
  // environment valuable.
  String className="com.oopreserch.dao.DaoHelperForJndi";
  SimpleDaoHelper helper
     =DaoHelperFactory.getDaoHelper(className);

  // Please specify your SQL statement here...
  String select="SELECT id,name FROM example WHERE age > ?";
  QueryData query=new QueryData(select);

  // Specify the value to be set on the SQL statement.
  query.addInt(20);

  // Please specify the return type(s) as the int array.
  // This int array must consist of the pre-defined int
  // constants...
  // The order is important!
  int[] types={QueryData.INT, QueryData.STRING};

  // Its time to execute your SQL statement...
  List list=helper.select(query,types);

  // The returned List includes the selected rows.
  // You can iterate each row...
  Iterator it=list.iterator();
  while(it.hasNext()){

     // Each object in the returned List is also the List.
     // And this nested List object represents each row...
     List row=(List)(it.next());

     // Get the first column...
     int id=(Integer)(row.get(0)).intValue();
     // Get the second column...
     String name=(String)(row.get(1));

  }