mabatis多个参数的使用

    Users findOne(@Param(value = "sname") String name , @Param(value = "ssex") String ssex);

    void update(Users user);
    void updateOne(String name);

  <select id="findOne" resultType="users"  >
        select * from stu where 1 = 1
        <if test="_parameter != null">
         and   sname = #{sname}
        </if>

        <if test="_parameter != null">
            and ssex = #{ssex}
        </if>
    </select>