Hibernate 一对多关系的兑现

Hibernate 一对多关系的实现

实体类User

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映射文件 user.hbm.xml
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public class Test { public static void main(String[] args) {  Session session=DBFactory.getSession();  Transaction ts=session.beginTransaction();  try{  Order order1=new Order();  order1.setName("Java");  order1.setBalance(99.5);  Order order2=new Order();  order2.setName("C++");  order2.setBalance(78.5);  Order order3=new Order();  order3.setName("JDBC");  order3.setBalance(96.5);  User user=new User();  user.setUsername("zhangsan");  user.setPassword("123456");  Set<Order> orders=new HashSet<Order>();  order1.setUser(user);  order2.setUser(user);  order3.setUser(user);  orders.add(order1);  orders.add(order2);  orders.add(order3);  user.setOrders(orders);  session.save(user);  ts.commit();    }catch(Exception e){   e.printStackTrace();   ts.rollback();  }finally{   session.close();  }   }}
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