<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-configuration PUBLIC

        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="hibernate.connection.password">root</property>

        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>

        <property name="hibernate.connection.username">root</property>

        <property name="hibernate.show_sql">true</property>

        <property name="hibernate.format_sql">true</property>

        <property name="hibernate.hbm2ddl.auto">update</property>

        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

        <property name="current_session_context_class">thread</property>

        <!--

        <mapping resource="com/chinasofti/entity/User.hbm.xml" />

        <mapping resource="com/chinasofti/entity/Role.hbm.xml" />

        -->

        <mapping class="com.chinasofti.entity.User"/>

        <mapping class="com.chinasofti.entity.Role"/>

    </session-factory>

</hibernate-configuration>

package com.chinasofti.entity;

import java.util.HashSet;

import java.util.Set;

import javax.persistence.CascadeType;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.OneToMany;

import javax.persistence.Table;

@Entity

@Table(name="T_USER2")

public class User {

    @Id

    @GeneratedValue(strategy=GenerationType.IDENTITY)

    private Integer user_id;

    private String user_name;

    private String user_password;

    @OneToMany(mappedBy="user",cascade=CascadeType.REMOVE)

    private Set<Role> roles = new HashSet<Role>(); 

    public Set<Role> getRoles() {

        return roles;

    }

    public void setRoles(Set<Role> roles) {

        this.roles = roles;

    }

    public Integer getUser_id() {

        return user_id;

    }

    public void setUser_id(Integer user_id) {

        this.user_id = user_id;

    }

    public String getUser_name() {

        return user_name;

    }

    public void setUser_name(String user_name) {

        this.user_name = user_name;

    }

    public String getUser_password() {

        return user_password;

    }

    public void setUser_password(String user_password) {

        this.user_password = user_password;

    }

    @Override

    public String toString() {

        return "User [user_id=" + user_id + ", user_name=" + user_name

                + ", user_password=" + user_password + "]";

    }

}

package com.chinasofti.entity;

import java.util.HashSet;

import java.util.Set;

import javax.persistence.CascadeType;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.ManyToOne;

import javax.persistence.Table;

@Entity

@Table(name="T_ROLE2")

public class Role {

    @Id

    @GeneratedValue(strategy=GenerationType.IDENTITY)

    private Integer role_id;

    private String role_name;

    private String role_memo;

    @ManyToOne

    @JoinColumn(name="user_id")

    private User user;

    public User getUser() {

        return user;

    }

    public void setUser(User user) {

        this.user = user;

    }

    public Integer getRole_id() {

        return role_id;

    }

    public void setRole_id(Integer role_id) {

        this.role_id = role_id;

    }

    public String getRole_name() {

        return role_name;

    }

    public void setRole_name(String role_name) {

        this.role_name = role_name;

    }

    public String getRole_memo() {

        return role_memo;

    }

    public void setRole_memo(String role_memo) {

        this.role_memo = role_memo;

    }

    @Override

    public String toString() {

        return "Role [role_id=" + role_id + ", role_name=" + role_name

                + ", role_memo=" + role_memo + "]";

    }

}

package com.chinasofti.entity;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

public class HibernateUtil {

    static Configuration CONFIGURATION = null;

    static SessionFactory SESSION_FACTORY = null;

    static Session SESSION = null;

    static{

        CONFIGURATION = new Configuration();

        CONFIGURATION.configure();

        SESSION_FACTORY = CONFIGURATION.buildSessionFactory();

        SESSION    = SESSION_FACTORY.openSession();

    }

    public static SessionFactory getSessionFactory(){

        return SESSION_FACTORY;

    }

    public static Session openSession(){

        return SESSION;

    }

}

package com.chinasofti.entity;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.junit.Test;

public class TestAnnotation {

    @Test

    public void removeRoleForUser(){

        Session session = HibernateUtil.openSession();

        Transaction transaction = session.beginTransaction();

        //先找到左冷禅

        //User zuolengchan = session.get(User.class, 1);

        //再找到角色-掌门

        Role zhangmen = session.get(Role.class, 1);

        session.delete(zhangmen);

        //session.save(zuolengchan);

        //session.update(zuolengchan);

        transaction.commit();

        session.close();

    }

    @Test

    public void testAnnotationOneToMany(){

        Session session = HibernateUtil.openSession();

        Transaction transaction = session.beginTransaction();

        User user = new User();

        user.setUser_name("左冷禅");

        user.setUser_password("guniang");

        //角色

        Role role1 = new Role();

        role1.setRole_name("掌门");

        role1.setRole_memo("zhangmen");

        //角色

        Role role2 = new Role();

        role2.setRole_name("教主");

        role2.setRole_memo("jiaozhu");

        role1.setUser(user);

        role2.setUser(user);

        //给左冷禅添加角色

        user.getRoles().add(role1);

        user.getRoles().add(role2);

        //保存左冷禅-级联角色

        session.save(user);

        transaction.commit();

        session.close();

    }

}