级联关系（内容大部分来自JavaEE轻量型解决方案其余的是我的想法）

 1 public class BusinessService{
 2     public static void main(String[] args){
 3           Customer customer = new Customer("lisi","123","李四","青岛","123123");
 4         Order order = new Order("3",new Date(),1000.0);//并没有传入customer对象
 5         //建立关联关系，实现级联保存
 6         customer.getOrders().add(order);
 7 
 8         Session session = HibernateUtils.getSession();
 9 
10         Transaction trans = session.beginTransaction();
11         session.save(customer);
12         trans.commit();
13         HibernateUtils.closeSession();
14     }
15 }

 1 Customer.hbm.xml
 2 <hibernate-mapping package="com.haiersoft.ch05.pojos">
 3     <class name="Custoemr" table="CUSTOMER">
 4     ... ...省略其它代码
 5         <!-- 1-N关联关系 -->
 6         <set name="orders" cascade="save-update">
 7             <key column="CUSTOMER_ID"/>
 8             <one-to-many class="Order"/>
 9         </set>
10     </class>
11 </hibernate-mapping>

 1 public class BusinessService{
 2     public static void main(String[] args){
 3         //添加客户和订单信息
 4         Customer customer = new Customer("lisi","123","李四","青岛市","123123123");
 5         Order order = new Order("3",new Date(),1000.0);
 6         //建立关联关系，实现级联保存
 7         customer.getOrders().add(order);
 8         //order对象必须关联customer对象，inverse才起作用
 9         order.setCustomer(customer);
10 
11 
12         Transaction trans = session.beginTransaction();
13         session.save(customer);
14         trans.commit();
15         HibernateUtils.closeSession();
16 
17     }
18 }