用户管理系统

用户管理系统 public boolean isExists(User u) { boolean flag=false; Session session=sessionFactory.openSession(); String hql="from User as u where u.username=? and u.userpass=? and u.userright=?"; Query query=session.createQuery(hql) ; query.setString(0, u.getUsername()); query.setString(1, u.getUserpass()); query.setInteger(2, u.getUserright()); List<User> list=query.list(); if(list.size()>0){ flag=true; } return flag; } public List<User> selectAll() { System.out.println("dao中查询所有"); Session session=sessionFactory.openSession(); Transaction tran=session.beginTransaction(); String hql="from User"; Query query=session.createQuery(hql); List list=query.list(); tran.commit(); session.close(); return list; } public boolean add(User u) { System.out.println("在执行UserDAO的add方法"); boolean flag=false; try { Session session=sessionFactory.openSession(); Transaction trans=session.beginTransaction(); session.save(u); trans.commit(); session.close(); flag=true; System.out.println("dao中添加成功"+flag); } catch (HibernateException e) { System.out.println("dao中添加失败"); e.printStackTrace(); } return flag; } public boolean delete(int uid) { System.out.println("dao中执行delete方法"); boolean flag = false; Session session=sessionFactory.openSession(); session.clear(); Transaction trans = session.beginTransaction(); String hql = "delete User as u where u.uid=?"; Query query = session.createQuery(hql); query.setInteger(0, uid); int state = query.executeUpdate(); trans.commit(); session.close(); if (state != 0) { flag = true; System.out.println("dao中删除成功"); } else { System.out.println("dao中删除不成功"); } return flag; } public User selectByUid(int uid) { System.out.println("dao中执行selectByUid方法"); Session session=sessionFactory.openSession(); session.clear(); Transaction trans = session.beginTransaction(); String hql = "from User as u where u.uid =?"; Query query = session.createQuery(hql); query.setInteger(0, uid); List list = query.list(); return (User) list.get(0); } public boolean update(User u) { System.out.println("dao中执行update方法"); boolean flag = false; try { Session session=sessionFactory.openSession(); session.clear(); Transaction trans = session.beginTransaction(); session.update(u); trans.commit(); session.close(); flag = true; System.out.println("dao中修改成成功"); } catch (HibernateException e) { System.out.println("dao中修改成不成功"); e.printStackTrace(); } return flag; }