使用级联更新时,通过子表更新始终取不到主表的主键值,导致子表外键值始终是空的,而通过主表更新,子表能够取到所有值,小弟不解到底是怎么回事,请编程能人指教,代码如下:
[code="java"]/*添加订单到数据库*/
Order_ order=new Order_();
User user=(User)session.get(Constants.LOGIN_USER);
order.setUserId(user.getUserId());
order=this.orderService.saveOrder(order);
/*添加订单项到数据库*/
List orderitems=(List)session.get(Constants.CART);
//一对多级联更新
Set set=new HashSet(orderitems);
order.setOrderitems(set);
this.orderService.updateOrder(order);
Orderitem orderitem=new Orderitem();
Hotel hotel=new Hotel();
for(int i=0;i < orderitems.size();i++){
orderitem=(Orderitem)orderitems.get(i);
// orderitem.setOrder(order);使用多对一更新的时候始终取不到外键值,而一对多可行
// this.orderitemService.saveOrderitem(orderitem);
/*预定后更新对应酒店的预定次数*/
hotel=this.hotelService.findByHotelId(String.valueOf(orderitem.getHotelId()));
hotel.setTimes(hotel.getTimes()+1);
this.hotelService.updateHotel(hotel);
}
[/code]
hbm.xml文件
[code="java"]
<!-- cascade="all"级联保存,更新,删除附属物。inverse="true"设置关联关系由对方维护。为set属性 -->
<!-- 相关联主键 -->
<!-- 设置一对多关联类 -->
[/code]
[code="java"]
column="oid"
class="com.myssh.po.Order_"
cascade="none"
update="false"
insert="false"
not-null="true"
/>
[/code]
PO部分
[code="java"]public class Order_ {
private int orderId;
private int userId;
private Set orderitems;//一对多字段[/code]
[code="java"]public class Orderitem {
private int orderitemId;
private int orderId;
private int hotelId;
private Date beginDate;
private int days;
private int type;
private Order_ order;//多对一字段[/code]