hibernate的transaction简介

一 简介

1、hibernate对数据的操作都是封装在事务当中，并且默认是非自动提交的方式，所以用session保存对象时，如果不开启事务，并且手工提交事务，对象并不会真正保存在数据库中。

2、如果想让hibernate像jdbc那样自动提交事务，必须调用session对象的doWork()方法，获得jdbc的connection后，设置其为自动提交事务模式。（注意：通常并不推荐这样做）

 

二 当将开启事务和提交事务关闭

        public void init(){

            // 创建配置对象  

            Configuration config = new Configuration().configure();

            //config.addClass(Students.class);

            // 创建服务注册对象

            ServiceRegistry serviceRegistery = new          ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry();

            // 创建会话工厂对象

            sessionFactory = config.buildSessionFactory(serviceRegistery);

            // 创建会话对象

            session = sessionFactory.openSession();

            // 开启事务

            //transaction = session.beginTransaction();

        }

        

        @After

        public void destory(){

            // 提交事务

            //transaction.commit();

            // 关闭会话

            session.close();

            // 关闭会话工厂

            sessionFactory.close();

        }

不开启事务就不能将对象保存到数据库中！

控制台输出：

Hibernate:

    drop table if exists STUDENTS

Hibernate:

    create table STUDENTS (

        SID integer not null,

        SNAME varchar(255),

        GENDER varchar(255),

        BIRTHDAY datetime,

        ADDRESS varchar(255),

        primary key (SID)

    )

九月 17, 2017 5:35:15 下午 org.hibernate.tool.hbm2ddl.SchemaExport execute

INFO: HHH000230: Schema export complete

 

三 设置自动提交方式

import java.sql.Connection;

import java.sql.SQLException;

import java.util.Date;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;

import org.hibernate.jdbc.Work;

import org.hibernate.service.ServiceRegistry;

import org.hibernate.service.ServiceRegistryBuilder;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

//测试类

public class StudentsTest {

    

    private SessionFactory sessionFactory;

    private Session session;

    private Transaction transaction;

    @Before

    public void init(){

        // 创建配置对象   

        Configuration config = new Configuration().configure();

        //config.addClass(Students.class);

        // 创建服务注册对象

        ServiceRegistry serviceRegistery = new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry();

        // 创建会话工厂对象

        sessionFactory = config.buildSessionFactory(serviceRegistery);

        // 创建会话对象

        session = sessionFactory.openSession();

        // 开启事务

        //transaction = session.beginTransaction();

    }

    

    @After

    public void destory(){

        // 提交事务

        //transaction.commit();

        // 关闭会话

        session.close();

        // 关闭会话工厂

        sessionFactory.close();

    }

    

    @Test

    public void testSaveStudents(){

        Students s= new Students(1,"张三丰","男",new Date(),"武当山");

        session.doWork(new Work(){

            @Override

            public void execute(Connection connection) throws SQLException {

                // TODO Auto-generated method stub

                connection.setAutoCommit(true);

            }

            

        });

        session.save(s);

        session.flush();

    }

}

控制台输出：

Hibernate:

    drop table if exists STUDENTS

Hibernate:

    create table STUDENTS (

        SID integer not null,

        SNAME varchar(255),

        GENDER varchar(255),

        BIRTHDAY datetime,

        ADDRESS varchar(255),

        primary key (SID)

    )

九月 17, 2017 5:46:00 下午 org.hibernate.tool.hbm2ddl.SchemaExport execute

INFO: HHH000230: Schema export complete

Hibernate:

    insert

    into

        STUDENTS

        (SNAME, GENDER, BIRTHDAY, ADDRESS, SID)

    values

        (?, ?, ?, ?, ?)