一、核心配置文件

     
         
              
       
        com.mysql.jdbc.Driver
               
       
        root
               
       
        jdbc:mysql://localhost:3306/test
               
       
        root
                       
       
        true
               
       
        true
               
       
        update
               
       
        org.hibernate.dialect.MySQLDialect
               
       
        thread
               
               
               
           
      
     

二、实体类

　　User

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
     
       roles = new HashSet
      
       ();     public Set
       
         getRoles() {        return roles;    }    public void setRoles(Set
        
          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 + "]";    }}
        
       
      
     

　　Role

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 + "]";    }}

三、封装类

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;    }}

四、测试类

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();    }}

 

 

补充