以《关联映射(一对多) (2)》为基础，只要改动一下Room类即可。
· 修改Room类，仅仅是添加了关联User类的代码。
Room.java
package javamxj.hibernate.association.one2many;import java.util.HashSet;import java.util.Set;/** * @hibernate.class table = "T_Room" */public class Room { private Long id; private String address; private Set users = new HashSet(); /** * @hibernate.id * column="ID" * generator-class="hilo" * unsaved-value="null" */ public Long getId() { return id; } public void setId(Long id) { this.id = id; } /** * @hibernate.property length = "24" */ public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } /** * @hibernate.collection-one-to-many * class = "javamxj.hibernate.association.one2many.User" * @hibernate.collection-key * column = "Room_ID" * @hibernate.set * cascade = "all" * table = "T_User" * inverse = "true" */ public Set getUsers() { return users; } public void setUsers(Set users) { this.users = users; }}
这个类同《关联映射(一对多) (1)》中的Room类几乎完全一样，有一点不同在于多了inverse = "true"，这样就将Room设置成了被控方，而将主控方交给了User。
· 然后同上面文章一样，生成映射文件，生成表，执行Demo，最后数据表中生成同上篇文章中相同的数据。
· 也可以修改Demo.java文件，让User设置关联关系，Room通过级联来更新User。
Demo.java
/* * Hibernate - 关联(Association)映射(一对多) * 创建日期 2005-4-27 * @author javamxj（分享java快乐） * @link Blog: htpp://blog.csdn.net/javamxj/ * htpp://javamxj.mblogger.cn */package javamxj.hibernate.association.one2many;import net.sf.hibernate.*;import net.sf.hibernate.cfg.*;public class Demo { public static void main(String[] args) throws HibernateException { Room room1 = new Room(); room1.setAddress("科研007"); Room room2 = new Room(); room2.setAddress("销售001"); User user1 = new User(); user1.setName("张三"); user1.setRoom(room1); User user2 = new User(); user2.setName("李四"); user2.setRoom(room1); User user3 = new User(); user3.setName("王二"); user3.setRoom(room2); room1.getUsers().add(user1); room1.getUsers().add(user2); room2.getUsers().add(user3); SessionFactory sf= new Configuration().configure().buildSessionFactory(); Session session = sf.openSession(); Transaction tx = session.beginTransaction(); session.save(room1); session.save(room2); tx.commit(); session.close(); sf.close(); }}
