MyBatis报错：A query was run and no Result Maps were found for the Mapped Statement

Posted 2022-10-20 dxj1016

错误sql：

<select id="selectUserName">
    select USER_NAME as userName
    from user
    where 1=1 and
    USER_ID=#userId
</select

正确sql：

<select id="selectUserName" resultType="map">
    select USER_NAME as userName
    from user
    where 1=1 and
    USER_ID=#userId
</select

原因：没有设置resultType，如果resultType=""，会导致启动不了后端

MyBatis查询都需要设置返回的resultTyper或者resultMap，否则会出现以上错误。