public List query(String jpql, Object[] params) {
   return dao.query(jpql, params, 0, -1);
 }
 public List query(String jpql) {
   return dao.query(jpql, null);
 }
 public List query(final String queryStr, final Object[] params, final int begin, final int max) {
   return dao.query(queryStr, params, begin, max);
 }