就是不能用get方法读取到数据库里面的email值，要怎么解决
User db_user=(User)session.get(User.class, user.getEmail());//这句话不行

public boolean CheckLogin(User user) {
    Session session =null;
    try{
        session=HibernateSessionFactory.getSession();
        User db_user=(User)session.get(User.class, user.getEmail());
        if(db_user==null){
            this.errMessage="帐号不存在";
            System.out.println(this.errMessage);
            return false;
        }else if(!db_user.getPassword().equals(user.getPassword())){
            this.errMessage="密码不正确";
            System.out.println(this.errMessage);
            return false;
        }
    }finally{
        HibernateSessionFactory.closeSession();
    }
    return true;

} 

}