package com.yuzd.hibernate;import java.util.Date;import junit.framework.TestCase;import org.hibernate.Session;import com.yuzd.util.HbmUtils;public class SessionTest extends TestCase {        public void addUser(){        Session session = null;        try {            session = HbmUtils.getSession();            session.beginTransaction();            User user = new User();            user.setName("aaa");            user.setPassword("aaa");            user.setCreateTime(new Date());            user.setExpireTime(new Date());            session.save(user);            session.getTransaction().commit();        } catch (Exception e) {            e.printStackTrace();            session.getTransaction().rollback();        }finally{            HbmUtils.closeSession(session);        }    }        public void getUser(){        Session session =null;        try {            session = HbmUtils.getSession();            session.beginTransaction();            //get方法是通过主键id来查找的，hibernate中get方法建议在事物中使用            //如果get方法查询不出结果则返回null            User user = (User) session.get(User.class, "402881e941c503b30141c503b7440001");            System.out.println(user.getName());            user.setName("李四");            session.save(user);            session.getTransaction().commit();        } catch (Exception e) {            e.printStackTrace();            session.getTransaction().rollback();                    }finally{            HbmUtils.closeSession(session);        }    }        public void loadUser(){        Session session = null;        try {            session = HbmUtils.getSession();            session.beginTransaction();            //只有在真正使用的时候才会发出sql指令，lazy延迟加载            //如果数据库中没有对应的数据的话就会抛出异常            User user = (User) session.load(User.class, "402881e941c5a1630141c5a482330001");            System.out.println(user.getName());//这句的时候才会真正的去数据库查询            session.getTransaction().commit();        } catch (Exception e) {            e.printStackTrace();            session.getTransaction().rollback();        }finally{            HbmUtils.closeSession(session);        }    }        public void updateUser(){        Session session = null;        try {            session = HbmUtils.getSession();            session.beginTransaction();            User user = new User();            user.setId("402881e941c5a1630141c5a482330001");            user.setName("王五");            //这样改的话会把其他的属性设置成null，一般采用的方法是先load然后更改属性值            session.update(user);            session.getTransaction().commit();        } catch (Exception e) {            e.printStackTrace();            session.getTransaction().rollback();        }finally{            HbmUtils.closeSession(session);        }    }        public void deleteUser(){        Session session = null;        try {            session = HbmUtils.getSession();            session.beginTransaction();            //先load然后再delete            User user = (User) session.load(User.class, "402881e941c5a1630141c5a482330001");            session.delete(user);            session.getTransaction().commit();        } catch (Exception e) {            e.printStackTrace();            session.getTransaction().rollback();        }finally{            HbmUtils.closeSession(session);        }    }}