商品管理画面、重複商品は個数を変更

src/main/java/com/example/repository/ShoesRepository.java

@@ -12,4 +12,9 @@ import com.example.domain.Shoes;
 public interface ShoesRepository extends JpaRepository<Shoes, Integer>{
 	@Query(value = "SELECT * FROM shoes WHERE product_status = ?1 ORDER BY id DESC", nativeQuery = true)
 	public List <Shoes> findAllByStatus(Integer status);
+
+//管理画面で使用
+	@Query(value = "SELECT * FROM shoes WHERE name = ?1 && size = ?2", nativeQuery = true)
+	public Shoes findOneAddStock(String name, Integer size);
+
 }
\ No newline at end of file

src/main/java/com/example/service/ShoesService.java

@@ -49,4 +49,9 @@ public class ShoesService {
 	public List<Shoes> findAllLimitedShoes() {
 	    return shoesRepository.findAllByStatus(1);
 	}
+	
+	//管理画面、重複商品のバリデーション
+	public Shoes findOneAddStock(String name, Integer size) {
+		return shoesRepository.findOneAddStock(name, size);
+	};
 }

src/main/java/com/example/web/ManagementController.java

@@ -62,7 +62,23 @@ public class ManagementController {
 			if(result.hasErrors()) {
 				return "management";
 			}
+			
 			multipartFile = form.getMultipartFile();
+			System.out.println(multipartFile);
+			
+			//以前に登録されている商品の場合に登録できないバリデーション
+			Shoes sameShoes = shoesService.findOneAddStock(form.getName(), form.getSize());
+			System.out.println(sameShoes);
+			if (!(sameShoes == null)) {
+				Integer sumStock = form.getStock() + sameShoes.getStock(); 
+				if (sumStock >= 10) {
+					sameShoes.setStock(10);
+					shoesService.update(sameShoes);
+				} else {
+					sameShoes.setStock(sumStock);
+					shoesService.update(sameShoes);
+				}			
+			} else {
 				Shoes shoes = new Shoes();
 				if (!multipartFile.isEmpty()) {
 					try {
@@ -112,12 +128,19 @@ public class ManagementController {
 				} else {
 					shoes.setPhoto("noimage.jpg");
 				}
+				
+				
 				shoes.setName(form.getName());
 				shoes.setPrice(form.getPrice());
 				shoes.setStock(form.getStock());
 				shoes.setSize(form.getSize());
 				shoes.setProductStatus(form.getProductStatus());
+				
+				
 				shoesService.update(shoes);
+			
+			}
+		
 		//遷移先 
 		return "redirect:/limited/admin/management";
 	}