ssp-server/src/main/resources/com/smcic/HotRankMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.smcic.api.hotrank.mapper.HotRankMapper">
    <select id="getLastDt" resultType="java.lang.String">
        select dt from hot_rank where platform = #{rank} order by id desc limit 1
    </select>
</mapper>