Hibernate5增删改

HibernateSessionFactory.java

package com.wxh.sessionFactory;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

public class HibernateSessionFactory {
  
  private static SessionFactory sessionFactory;
  private static Session session;
  
  static{
    //获取标准的服务注册对象   
    final StandardServiceRegistry reg=new StandardServiceRegistryBuilder().configure().build();
    
    //根据标准服务注册对象获取元数据的数据对象，并从数据集中构建一个sessionFactory
    sessionFactory=new MetadataSources(reg).buildMetadata().buildSessionFactory();
  }
  
  public static Session getSession(){
    if(session==null){
      session=sessionFactory.openSession();
    }
    return session;
  }
  
}

TestCRUD.java

package com.wxh.test;

import org.hibernate.Session;

import com.wxh.dto.User;
import com.wxh.sessionFactory.HibernateSessionFactory;

public class TestCRUD { 
  
  private Session session;
  public TestCRUD(){
    session=HibernateSessionFactory.getSession();
  }
  
  
  public void select(int id){
    
    User user=session.get(User.class,id);
    System.out.println(user);
  } 
  
  public void delete(int id){
    session.beginTransaction();//开启事务
    User user=session.get(User.class,id);
    session.delete(user);
    session.getTransaction().commit();//提交事务
  }
  
  public void update(User user){
    session.beginTransaction();
    User u=session.get(User.class, user.getUserid());
    u.setPassword(user.getPassword());
    session.update(u);//可以不写这句    
    session.getTransaction().commit();
  } 
  
  public static void main(String[] args) {
    //new TestCRUD().select(2);
    //new TestCRUD().delete(2);
    User user=new User();
    user.setUserid(1);
    user.setPassword("111");
    new TestCRUD().update(user);
    
  }
}