xy-device/device-api-service/src/main/resources/mapper/DeviceStatusMapper.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.xy.mapper.DeviceStatusMapper">

    <!-- 统计状态数量 -->
    <select id="statusCount" resultType="com.xy.mapper.entity.DeviceStatusCount">
        select
        (select count(*) busy_state from device_info where busy_state = 1) busyState,
        (select count(*) net_state from device_status where net_state = 0) netState,
        (select count(*) device_state from device_status where device_state = 1) deviceState,
        (select count(*) active_state from device_info where active_state = 1) activeState,

        (select count(*) temp_state from device_status where temp_state = 1) tempState
        from dual
    </select>
</mapper>