采用limit直接获取相机列表

web/src/main/java/com/zhehekeji/web/service/CameraService.java

@@ -188,15 +188,16 @@ public class CameraService extends ServiceImpl<CameraMapper,Camera> {
      * @return
      */
     public List<Camera> allCameras1(){
-
-
-        List<Camera> cameras = cameraMapper.selectList(new QueryWrapper<>());
+        int count = configProperties.getVideoStyleConfig().getVideoStyleColumn() * configProperties.getVideoStyleConfig().getVideoStyleRow();
+        int group = 0 ;
+        List<Camera> cameras = cameraMapper.selectList(new QueryWrapper<Camera>().last("limit "+group+","+count));
         return cameras;
     }
 
     public List<Camera> allCameras2(){
-
-        List<Camera> cameras = cameraMapper.selectByMap(new HashMap<>());
+        int count = configProperties.getVideoStyleConfig().getVideoStyleColumn() * configProperties.getVideoStyleConfig().getVideoStyleRow();
+        int group = 1*  count;
+        List<Camera> cameras = cameraMapper.selectList(new QueryWrapper<Camera>().last("limit "+group+","+count));
         return cameras;
     }