解决Hibernate4执行update操作,不更新数据的问题

Session session = this.getSessionFactory().getCurrentSession();
ession.update(obj);

public void updateUser(String name, String tel,
            String msg, Date date){
String hqlStr = "UPDATE User a"
                + " SET a.userName=? ,"
                + "  a.createTime=? ,"
                + "  a.phone=?, "
                + "  a.backMsg=? "
                + " WHERE a.userId=?";
        Session session = this.getSessionFactory().getCurrentSession();
        session.createQuery(hqlStr).setString(0, name)
            .setTimestamp(1, date).setString(2, tel).setString(3, msg).setString(4, id).executeUpdate();
        
    }
}