Session session = AS400Session.currentSession();
      Query sql = null;
      if(criteria.equals("CODICE"))
         sql=session.createQuery("Select ay.matema,ay.de30ma, from MaterialiVO as ay where ay.clmama=? and ay.matema like '?' and ay.strema='' ");
      else
        sql=session.createQuery("Select ay.matema,ay.de30ma, from MaterialiVO as ay where ay.clmama=? and ay.de30ma like '?' and ay.strema='' ");

      sql.setString(0,cdc_classe);
      sql.setString(1,"'"+params+"%'");