public void testSave1() {

               Session session = null;               Transaction tx = null;               try {                        session = HibernateUtils.getSession();                       tx = session.beginTransaction();                       User1 user = new User1();                       user.setName("李四");

                        //主键采用数据库序列自动生成策略

                       session.save(user);

                        /*flush()和缓存相关。执行时会清除session缓存并向数据库发送SQL语句并执行，但此时如果数据库当前    存 在一个事务，数据库会先将这些SQL语句缓存起来，那么此时在数据库中是无法看到SQL语句执行结果的。除非执行commit提交了事务。只要没有执行commit()方法，就能通过rollback()方法进行回滚*/

                       session.flush();                       /*提交事务,默认情况下commit操作会先执行flush清理缓存，所以不用显示的调用flush,commit后数据是无法 回滚的*/

                       tx.commit();               } catch (Exception e) {                        e.printStackTrace();                       tx.rollback();               } finally {                        HibernateUtils.closeSession(session);               }       }