mybatis出现There is no getter for property named 'Id' in 'class java.lang.Intege

当传入数据只有一个时mybatis中<if>判断会出现There is no getter for property named 'Id' in 'class java.lang.Intege

用"_parameter"代替当前参数

<select id="selectOrderById"  parameterType="java.lang.Integer" resultType="java.util.Map">        select order_id,order_num        from order        where deleted = 0         <if test="_parameter != null">            and order_id = #{_parameter,jdbcType=INTEGER}        </if></select>