4S/target/classes/mapper/EnvHistoryRecordMapper.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.zhgd.scs.mapper.EnvHistoryRecordMapper">

    <select id="getEnvDataHourCount" resultType="com.zhgd.scs.domain.vo.NameCountDate">
        SELECT DATE_FORMAT(timer, '%H') date,
               project_id               `name`,
               devid                    `type`,
               AVG(${type})             point
        FROM `env_history_record`
        WHERE DATE_FORMAT(timer, '%Y-%m-%d %H') = DATE_FORMAT(DATE_SUB(NOW(), INTERVAL 1 HOUR), '%Y-%m-%d %H')
        GROUP BY project_id,
                 devid,
                 DATE_FORMAT(timer, '%H')
    </select>
</mapper>