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();

    }
}