fix:大屏查询记录GC问题

yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/dal/mysql/deviceoperationrecord/DeviceOperationRecordMapper.java

@@ -36,5 +36,5 @@ public interface DeviceOperationRecordMapper extends BaseMapperX<DeviceOperation
     List<DeviceOperationRecordDO> selectLatestByDeviceAndRule(@Param("deviceIds") List<Long> deviceIds, @Param("ruleCodes") List<String> ruleCodes);
 
 
-
+    List<DeviceOperationRecordDO> selectLatestRecords(@Param("deviceIds") Collection<Long> deviceIds);
 }

yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/service/device/DeviceServiceImpl.java

@@ -1330,22 +1330,14 @@ public class DeviceServiceImpl implements DeviceService {
             return Collections.emptyMap();
         }
 
-        // 查询所有设备的最新运行记录
-        List<DeviceOperationRecordDO> records = deviceOperationRecordMapper.selectList(
-                Wrappers.<DeviceOperationRecordDO>lambdaQuery()
-                        .in(DeviceOperationRecordDO::getDeviceId, deviceIds)
-                        .orderByDesc(DeviceOperationRecordDO::getCreateTime));
+        List<DeviceOperationRecordDO> records = deviceOperationRecordMapper.selectLatestRecords(deviceIds);
 
-        // 构建设备ID到最新记录的映射
-        Map<Long, DeviceOperationRecordDO> latestRecordMap = new HashMap<>();
-        for (DeviceOperationRecordDO record : records) {
-            // 只保留每个设备的第一条记录（因为已经按创建时间倒序排序）
-            if (!latestRecordMap.containsKey(record.getDeviceId())) {
-                latestRecordMap.put(record.getDeviceId(), record);
-            }
-        }
-
-        return latestRecordMap;
+        // 直接用 Stream 转 Map
+        return records.stream()
+                .collect(Collectors.toMap(
+                        DeviceOperationRecordDO::getDeviceId,
+                        Function.identity()
+                ));
     }
 
     /**

yudao-module-iot/yudao-module-iot-biz/src/main/resources/mapper/deviceoperationrecord/DeviceOperationRecordMapper.xml

@@ -73,4 +73,21 @@
         WHERE tmp.rn = 1
 
     </select>
+    <select id="selectLatestRecords"
+            resultType="cn.iocoder.yudao.module.iot.dal.dataobject.deviceoperationrecord.DeviceOperationRecordDO">
+        SELECT t1.*
+        FROM device_operation_record t1
+        INNER JOIN (
+        SELECT device_id, MAX(create_time) AS max_time
+        FROM device_operation_record
+        WHERE device_id IN
+        <foreach collection="deviceIds" item="id" open="(" separator="," close=")">
+            #{id}
+        </foreach>
+        GROUP BY device_id
+        ) t2
+        ON t1.device_id = t2.device_id
+        AND t1.create_time = t2.max_time
+
+    </select>
 </mapper>