在做更新和删除的时候一定要把事务开启
在做更新和删除的时候一定要把事务开启
在做更新和删除的时候一定要把事务开启
重要的事情说三遍！！！
curd之前配置文件
update
练习hibernate的CURD（单表操作 save& update& delete& get/load ）时，发现update& delete方法执行不成功，冥思苦想也没想出个所以然，期间连重启等等笨办法都试了，结果毫无头绪，等到不经意间往上一翻，发现TM之前试验不利用事务提交的方法后事务没开启，WTF。。。
回顾一下不开事务也能提交的方法
session.doWork(new Work(){ @Override public void execute(Connection connection) throws SQLException { // TODO Auto-generated method stub connection.setAutoCommit(true); } }); //保存对象进数据库 session.save(s); //强制输出sql语句 session.flush(); 整个代码。。。之前init()和destory()中红色部分注释了
package hibernate_01;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;//测试的源程序要写在新建的Source Folder里 //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(); //创建服务注册对象 ServiceRegistry serviceRegistry=new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry(); //创建会话工厂对象 sessionFactory=config.buildSessionFactory(serviceRegistry); //会话对象 session =sessionFactory.openSession(); //开启事务 transaction =session.beginTransaction(); } @After public void destory(){ transaction.commit();//提交事务 session.close();//关闭会话 sessionFactory.close();//关闭会话工厂 } @Test public void testSaveStudents(){ //生成学生对象 Students s=new Students(2,"张三","男",new Date(),"山东"); session.doWork(new Work(){ @Override public void execute(Connection connection) throws SQLException { // TODO Auto-generated method stub connection.setAutoCommit(true); } }); //保存对象进数据库 session.save(s); //强制输出sql语句 session.flush(); } @Test public void testGetStudents(){ Students s=(Students) session.get(Students.class, 1); //.get(查询表对应的类对象, 查询对象的主键); System.out.println(s.toString()); } @Test public void testLoadStudents(){ Students s=(Students) session.load(Students.class, 1); //.load(查询表对应的类对象, 查询对象的主键); System.out.println(s.toString()); } @Test public void testUpdateStudents(){ Students s=(Students) session.get(Students.class, 1); s.setGender("女"); session.update(s); session.flush(); } @Test public void testDeleteStudents(){ Students s=(Students) session.load(Students.class, 2); System.out.println(s.toString()); session.delete(s); session.flush(); } } 当然，不开启事务，也能执行成功（虽然麻烦），update &delete 都要学习testSaveStudents()方法添加doWork那一段了