TASK:模块化；

src/main/java/com/ai/da/service/ProjectService.java

@@ -0,0 +1,28 @@
+package com.ai.da.service;
+
+import com.ai.da.mapper.primary.entity.Design;
+import com.ai.da.mapper.primary.entity.Project;
+import com.ai.da.model.dto.*;
+import com.ai.da.model.vo.CollectionSketchVO;
+import com.ai.da.model.vo.DesignCollectionVO;
+import com.ai.da.model.vo.DesignItemDetailVO;
+import com.ai.da.model.vo.DesignLikeVO;
+import com.ai.da.python.vo.DesignPythonObjects;
+import com.alibaba.fastjson.JSONObject;
+import com.baomidou.mybatisplus.extension.service.IService;
+
+import java.math.BigDecimal;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * 服务类
+ *
+ * @author yanglei
+ * @since 2022-09-11
+ */
+public interface ProjectService extends IService<Project> {
+
+    Set<Long> getChildProjectIdSet(Long projectId);
+}