session.getTransaction()只是根据session获得一个Transaction实例，但是并没有启动它
session.beginTransaction()在获得一个Transaction后调用其begin()方法
（1）
session = HibernateUtil.getSession();//这是开启Session的操作
session.beginTransaction();//这是开启Transaction的操作
session.save(user);//这正是把数据放入一级缓存session中的操作
session.getTransaction().commit();//此处才是真正与数据库交互的语句
（2）
Session session=HibernateTools.getSession();
Transaction tx=session.beginTransaction();
session.save(user);
tx.commit();
session.close();
如：
public static void main(String[] args) throws ParseException {
//获取配置文件
Configuration configuration = new Configuration().configure();
//注册服务对象
StandardServiceRegistryBuilder serviceRegistryBuilder = new StandardServiceRegistryBuilder();
StandardServiceRegistry serviceRegistry = serviceRegistryBuilder.applySettings(configuration.getProperties()).build();
//获取SessionFactory
SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
//获取session
Session session = sessionFactory.openSession();
//开启事务
session.beginTransaction();
//************开始操作*************//
//1. 利用 get 方法获取 id 为 1 的用户数据
???????Commodity getCommodity = (Commodity) session.get(Commodity.class, 1);
???????System.out.println("创建日期:" + getCommodity.getCreateDate() + "描述:" + getCommodity.getDescribe() + "修改日期:" + getCommodity.getModifyDate() + "名称:" + getCommodity.getName());
// ???????Date date = new Date(0);
???????String stringdate = "2019-05-07";
???????Date date = ?new SimpleDateFormat("YYYY-MM-DD").parse(stringdate);
???????
???????//2.增加商品
// ???????Commodity newCommodity = new Commodity(date,"电器1",date,"电饭锅2");
// ???????session.save(newCommodity);
???????
???????//3.删
// ???????Commodity getCommodity1 = (Commodity) session.load(Commodity.class, 2);
// ???????session.delete(getCommodity1);
// ???????session.getTransaction().commit();
???????
???????//4.改
// ???????Commodity getCommodity2 = (Commodity) session.get(Commodity.class, 1);
// ???????getCommodity2.setName("洗脸盆");
// ???????session.update(getCommodity2);
// ???????session.getTransaction().commit();
???????//************结束操作*************//
//提交事务
session.getTransaction();
//关闭session
session.close();
//关闭SessionFactory
sessionFactory.close();
}
再如：
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import online.shixun.shop.model.User;
public class HibernateDemo {
???public static void main(String[] args) {
???????// 获取配置文件
???????Configuration configuration = new Configuration().configure();
???????// 注册服务对象
???????StandardServiceRegistryBuilder serviceRegistryBuilder = new StandardServiceRegistryBuilder();
???????StandardServiceRegistry serviceRegistry = serviceRegistryBuilder.applySettings(configuration.getProperties()).build();
???????// 获取 SessionFactory
???????SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
???????// 获取 Session
???????Session session = sessionFactory.openSession();
???????// 开启事务
???????session.beginTransaction();
???????//***************开始数据操作***************//
???????//1. 利用 get 方法获取 id 为 1 的用户数据
???????User getUser = (User) session.get(User.class, 1);
???????System.out.println("Get 用户名/密码/年龄：" + getUser.getName() + "/" + getUser.getPassword() + "/" + getUser.getAge());
???????//2. 利用 load 方法获取 id 为 1 的用户数据
???????User loadUser = (User) session.load(User.class, 1);
???????System.out.println("Load 用户名/密码/年龄：" + loadUser.getName() + "/" + loadUser.getPassword() + "/" + loadUser.getAge());
???????//3. 利用 save 方法新增用户数据（执行完成以下语句，利用数据库客户端工具查询表中是否有新数据增加）
???????User newUser = new User("武汉", "innovaee", 16);
???????session.save(newUser);
???????//4. 利用 saveOrUpdate 方法，修改 getUser 数据
???????getUser.setName("轻实训！");
???????session.saveOrUpdate(getUser);
???????//5. 利用 delete 方法删除 getUser 数据
???????session.delete(getUser);
???????//***************结束数据操作***************//
???????// 提交事务
???????session.getTransaction().commit();
???????// 关闭 Sessin
???????session.close();
???????// 关闭 SessionFactory
???????sessionFactory.close();
???}
}
Hibernate的getTransaction（）和beginTransaction()
原文地址：http://www.cnblogs.com/yzp666/p/7529092.html