public List<DITableSourceType> getTableSourceTypes()
 {
     DI_DAO dao = null;
     List<DITableSourceType> list = null;
     try
     {
         dao = new DI_DAO();
         dao.beginTransaction();
         list = dao.getTableSourceType();
         dao.commitTransaction();
     }
     catch (Exception ex)
     {
         dao.rollbackTransaction();
         throw ex;
     }
     return list;
 }