在使用mybatis时，写了一条sql语句，只有一个String类型的参数， 示例代码
<select id="getApplyNum" parameterType="java.lang.String" resultType="java.util.Map">
SELECT
t.activity_id AS "activityId",
COUNT(1) AS "count"
FROM
t_user t
WHERE
t.activity_id IN (${ids})
GROUP BY
t.activity_id
</select>
Mybatis查询sql传入一个字符串传参数，报There is no getter for property named 'ids' in 'class java.lang.String'。
后来改成如下写法，无论参数名是啥，都要改成"_parameter"。问题解决。
<select id="getApplyNum" parameterType="java.lang.String" resultType="java.util.Map">
SELECT
t.activity_id AS "activityId",
COUNT(1) AS "count"
FROM
t_user t
WHERE
t.activity_id IN (${_parameter})
GROUP BY
t.activity_id
</select>
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