hibernate 不寻常的查询

/**
  * 前台查询酒店的级别，设备，类型
  *
  * @param propertyName
  * @return
  */
 @SuppressWarnings("unchecked")
 public Map<String, Integer> findByHotelInfo(final String propertyName) {
  final String queryString = "select new Map(? as hotelInfoName,count(?) as hotelInfoCount ) from Hotel group by ?";
  return (Map<String, Integer>) this.getHibernateTemplate().execute(
    new HibernateCallback() {
     @Override
     public Object doInHibernate(Session session)
       throws HibernateException, SQLException {
      Query query = session.createQuery(queryString);
      query.setString(0, propertyName);
      query.setString(1, propertyName);
      query.setString(2, propertyName);
      return query.uniqueResult();
     }
    });
 }