我正在尝试执行以下HQL查询：

select count(*) , od.itemSubtype.name from OrderDetails od inner join od.itemSubtype where od.employee = 1 group by od.itemSubtype

我的POJO是：

OrderDetails 
 -------------
 private Integer id;
 private Employee employee;
 private Order order;
 private ItemSubtype itemSubtype;
 private Integer quantity;
 private String imageStyle;
 private String imageCapture;
 private Date workStartedOn;
 private Date workFinishedOn;

 ItemSubtype 
 -----------     
 private Integer id;
 private ItemType itemType;
 private String name;
 private Set orderDetailses = new HashSet(0);
 private Set measuresBooks = new HashSet(0);

由于查询无法强制转换现有的POJO，因此我无法检索结果。如何执行此查询？我需要写一个新的POJO吗？另外，我如何从迭代中获得数据？

Query query = session.createQuery(hql);

       // query.setParameter("employee_id", employee_id);

        Iterator i = query.iterate();
         while (i.hasNext()) {
            Object obj = i.next();
           // how to retrive values from this obj??
         }