Transaction 事务

Transaction 事务详解

import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;
import org.junit.Test;

import com.itheima.a_hello.User;
//详解Transaction对象
public class Transaction_test {
  @Test
  //Transaction 封装了事务的操作
  //开启事务
  //提交事务
  //回滚事务
  public void fun1(){
    //1加载配置
    Configuration  conf = new Configuration().configure();
    //2 根据Configuration 配置信息创建 SessionFactory
    SessionFactory sf = conf.buildSessionFactory();
    //3 获得session
    Session session = sf.openSession();
    //-------------------------------
    //打开事务
    Transaction ts = session.beginTransaction();
    //获得已经打开的事务对象(很少用)
    session.getTransaction();
    
    //Transaction 控制如何关闭事务
    //提交
    ts.commit();
    //回滚
    ts.rollback();
    
    //-------------------------------
    session.close();
    sf.close();
  }
  //事务的细节
  @Test
  public void fun2(){
    //1加载配置
    Configuration  conf = new Configuration().configure();
    //2 根据Configuration 配置信息创建 SessionFactory
    SessionFactory sf = conf.buildSessionFactory();
    //3 获得与当前线程绑定的session
    Session session = sf.getCurrentSession();
    //-------------------------------
    //事务关闭时,会自动把与当前线程关联的session关闭,并删除
    session.beginTransaction().commit();
    
    //在获得当前线程绑定的session时. 获得的是新的session
    Session session2 = sf.getCurrentSession();
    
    System.out.println(session==session2);//false
    
    //-------------------------------
    session.close();
    sf.close();
  }
}