refactor(os-ems): 将 IIF 函数替换为 CASE WHEN 语句，适应MySQL

os-ems/src/main/resources/mapper/ems/record/EmsRecordAlarmDataMapper.xml

@@ -44,7 +44,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
                rad.notify_user,
                bmi.monitor_name,
                ebcdi.collect_device_name,
-               IIF(rad.monitor_id is null, ebcdi.collect_device_name, bmi.monitor_name) device_name
+               CASE WHEN rad.monitor_id is null THEN ebcdi.collect_device_name ELSE bmi.monitor_name END device_name
         FROM ems_record_alarm_data rad
                  LEFT JOIN ems_base_monitor_info bmi ON rad.monitor_id = bmi.monitor_code
                  LEFT JOIN ems_base_collect_device_info ebcdi on rad.collect_device_id = ebcdi.collect_device_id