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雪山飞鹄

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Role.java
package com.many2many.bean;

import java.util.Set;

public class Role {
    
    
private int id;
    
private String name;
    
private Set<User> 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<User> getUsers() {
        
return users;
    }
    
public void setUsers(Set<User> users) {
        
this.users = users;
    }
    
}
User.java
package com.many2many.bean;

import java.util.Set;

public class User {
    
    
private int id;
    
private String name;
    
private Set<Role> roles;
    
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<Role> getRoles() {
        
return roles;
    }
    
public void setRoles(Set<Role> roles) {
        
this.roles = roles;
    }
    
}
映射文件
Role.hbm.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"
>
    
<hibernate-mapping package="com.many2many.bean">
        
<class name="Role" table="roles" catalog="Hibernate_Many2Many">
            
<id name="id" column="id">
                
<generator class="native"/>
            
</id>
            
<property name="name" column="name"/>
            
<set name="users" table="user_role" cascade="all">
                
<key>
                    
<column name="role_id"/>
                
</key>
                
<many-to-many column="user_id" class="User"/>
            
</set>
        
</class>
    
</hibernate-mapping>

User.hbm.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"
>
    
<hibernate-mapping package="com.many2many.bean">
        
<class name="User" table="users" catalog="Hibernate_Many2Many">
            
<id name="id" column="id">
                
<generator class="native"/>
            
</id>
            
<property name="name" column="name"/>
            
<set name="roles" table="user_role" cascade="all">
                
<key>
                    
<column name="user_id"/>
                
</key>
                
<many-to-many column="role_id" class="Role"/>
            
</set>
        
</class>
    
</hibernate-mapping>

导出的sql
create table Hibernate_Many2Many.roles (
        id 
integer not null auto_increment,
        name 
varchar(255),
        
primary key (id)
    )

    
create table Hibernate_Many2Many.users (
        id 
integer not null auto_increment,
        name 
varchar(255),
        
primary key (id)
    )

    
create table user_role (
        role_id 
integer not null,
        
user_id integer not null,
        
primary key (user_id, role_id)
    )

    
alter table user_role 
        
add index FK143BF46ADA6B394F (role_id), 
        
add constraint FK143BF46ADA6B394F 
        
foreign key (role_id) 
        
references Hibernate_Many2Many.roles (id)

    
alter table user_role 
        
add index FK143BF46A7F95FD2F (user_id), 
        
add constraint FK143BF46A7F95FD2F 
        
foreign key (user_id
        
references Hibernate_Many2Many.users (id)

测试代码
@Test
    
public void insert(){
        Session session
=HibernateSessionFactory.getSession();
        Transaction transaction
=session.beginTransaction();
        
try {
            transaction.begin();
            User user
=new User();
            user.setName(
"张三");
            
            Role role
=new Role();
            role.setName(
"管理员");
            Set
<Role> roles=new HashSet<Role>();
            roles.add(role);
            user.setRoles(roles);
            
            session.persist(user);
            
            transaction.commit();
        } 
catch (HibernateException e) {
            e.printStackTrace();
            transaction.rollback();
        }
    }
    
    
    @Test
    
public void select(){
        Session session
=HibernateSessionFactory.getSession();
        User user
=(User) session.get(User.class1);
        System.out.println(user.getName());
        Set
<Role> roles=user.getRoles();
        
for (Iterator<Role> iterator = roles.iterator(); iterator.hasNext();) {
            Role role 
= (Role) iterator.next();
            System.out.println(role.getName());
        }
    }
posted on 2010-10-18 21:06 雪山飞鹄 阅读(4203) 评论(0)  编辑  收藏 所属分类: Hibernate

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