完成Bean改造

src/main/java/net/alawn/bill/repository/MainRepo.java

@@ -0,0 +1,19 @@
+package net.alawn.bill.repository;
+
+import net.alawn.bill.entity.po.Main;
+import net.alawn.bill.entity.po.Post;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+/**
+ * @Author: Alawn
+ * @Description:
+ * @Date: Create in 11:14 2019-05-23
+ */
+
+@Repository
+public interface MainRepo extends JpaRepository<Main, Long> {
+    List<Main> findByPost(Post post);
+}