package com.bjpowernode.hibernate; 
import java.util.Set; 
public class Group { 
 private int id; 
 private String name; 
 private Set users; 
  
 public int getId() { 
  return id; 
 } 
 public void setId(int id) { 
  this.id = id; 
 } 
 public String getName() { 
  return name; 
 } 
 public void setName(String name) { 
  this.name = name; 
 } 
 public Set getUsers() { 
  return users; 
 } 
 public void setUsers(Set users) { 
  this.users = users; 
 } 
} 

package com.bjpowernode.hibernate; 
public class User { 
 private int id; 
 private String name; 
 public int getId() { 
  return id; 
 } 
 public void setId(int id) { 
  this.id = id; 
 } 
 public String getName() { 
  return name; 
 } 
 public void setName(String name) { 
  this.name = name; 
 } 
} 

<?xml version=1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC 
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
<hibernate-mapping> 
 <class name="com.bjpowernode.hibernate.User" table="t_user"> 
  <id name="id"> 
   <generator class="native"/> 
  </id> 
  <property name="name"/> 
 </class> 
</hibernate-mapping> 

<?xml version="1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC 
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
<hibernate-mapping> 
 <class name="com.bjpowernode.hibernate.Group" table="t_group"> 
  <id name="id"> 
   <generator class="native"/> 
  </id> 
  <property name="name"/> 
  <!-- users属性，表达的是本对象与User的一对多的关系 --> 
  <set name="users"> 
    <!--当前表（Group）的主键--> 
   <key column="groupid"/> 
   <one-to-many class="com.bjpowernode.hibernate.User"/> 
  </set> 
 </class> 
</hibernate-mapping> 

package com.bjpowernode.hibernate; 
import java.util.Set; 
public class Group { 
 private int id; 
 private String name; 
 private Set users; 
 
 public int getId() { 
  return id; 
 } 
 public void setId(int id) { 
  this.id = id; 
 } 
 public String getName() { 
  return name; 
 } 
 public void setName(String name) { 
  this.name = name; 
 } 
 public Set getUsers() { 
  return users; 
 } 
 public void setUsers(Set users) { 
  this.users = users; 
 } 
} 

package com.bjpowernode.hibernate; 
public class User { 
 private int id; 
 private String name; 
 private Group groups; 
 public int getId() { 
  return id; 
 } 
 public void setId(int id) { 
  this.id = id; 
 } 
 public String getName() { 
  return name; 
 } 
 public void setName(String name) { 
  this.name = name; 
 } 
 public Group getGroups() { 
  return groups; 
 } 
 public void setGroups(Group groups) { 
  this.groups = groups; 
 } 
} 

<?xml version="1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC 
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
<hibernate-mapping package="com.bjpowernode.hibernate"> 
 <class name="Group" table="t_group"> 
  <id name="id"> 
   <generator class="native"/> 
  </id> 
  <property name="name"/> 
  <!-- 影响控制反转：inverse="false",多的一端维护关系，让一的一端失效 --> 
  <set name="users" inverse="true"> 
   <key column="groupid" not-null="true"/> 
   <one-to-many class="User"/> 
  </set> 
 </class> 
</hibernate-mapping> 

<?xml version="1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC 
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
<hibernate-mapping package="com.bjpowernode.hibernate"> 
 <class name="User" table="t_user"> 
  <id name="id"> 
   <generator class="native"/> 
  </id> 
  <property name="name"/> 
  <!-- groups属性，表达的是本对象与Group的多对一的关系 --> 
  <many-to-one name="groups" class="Group" column="groupid"/> 
 </class> 
</hibernate-mapping>