JPA를 사용하여 네이버 예약 시스템 구현

build.gradle

@@ -21,6 +21,9 @@ repositories {
 dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
 	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.data:spring-data-jpa:2.7.2'
+	implementation 'mysql:mysql-connector-java:8.0.30'
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa:2.7.3'
 	compileOnly 'org.projectlombok:lombok'
 	annotationProcessor 'org.projectlombok:lombok'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'

src/main/java/com/landvive/summer/mvc/controller/CategoryController.java

@@ -22,19 +22,19 @@ public class CategoryController {
     @PostMapping("/category")
     @ResponseBody
     public CategoryResponse create(@RequestBody CategoryRequest request) {
-            Long id = service.create(request);
+        Long id = service.create(request);
 
-            if(id == -1L) {
-                return new CategoryResponse(-1, null);
-            }
+        if(id == -1L) {
+            return new CategoryResponse(-1, null);
+        }
 
-            return new CategoryResponse(0, request);
+        return new CategoryResponse(0, request);
     }
 
     @GetMapping("/categories")
     @ResponseBody
     public CategoriesResponse findAll() {
-        List<Category> categoryList = service.findAll();
+        List<Category> categoryList = service.getCategoryList();
         return new CategoriesResponse(categoryList.size(), categoryList);
     }
-}
+}

src/main/java/com/landvive/summer/mvc/controller/ProductController.java

@@ -17,12 +17,12 @@
 public class ProductController {
 
     private final ProductService service;
-    private final CategoryService categoryService;
 
     @PostMapping("/product")
     @ResponseBody
     public ProductResponse create(@RequestBody ProductRequest request) {
-        Long id = service.create(request);
+        Long id = service.postProduct(request);
+
         if(id == -1) {
             return new ProductResponse(-1, null);
         }
@@ -32,7 +32,7 @@ public ProductResponse create(@RequestBody ProductRequest request) {
     @GetMapping("/products")
     @ResponseBody
     public ProductsResponse findAll() {
-        List<Product> productsList = service.findAll();
+        List<Product> productsList = service.getProductList();
         return new ProductsResponse(productsList.size(), productsList);
     }
 
@@ -41,7 +41,17 @@ public ProductsResponse findAll() {
     public ProductDetailResponse findDetails(@PathVariable ("productId") Long productId) {
 
         Product product = service.findById(productId);
-        Category category = categoryService.findById(product.getCategoryId());
-        return new ProductDetailResponse(product.getId(), product.getCategoryId(), category.getName(), product.getName(),product.getDescription(), product.getCreatedAt());
+        Category category = product.getCategory();
+
+        return ProductDetailResponse.builder()
+                .id(product.getId())
+                .categoryId(category.getId())
+                .categoryName(category.getName())
+                .name(product.getName())
+                .description(product.getDescription())
+                .createdAt(product.getCreatedAt())
+                .build();
+
     }
-}
+
+}

src/main/java/com/landvive/summer/mvc/dto/response/ProductDetailResponse.java

@@ -1,16 +1,14 @@
 package com.landvive.summer.mvc.dto.response;
 
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
+import lombok.*;
 
 import java.time.LocalDateTime;
 
 @Getter
 @Setter
 @AllArgsConstructor
 @NoArgsConstructor
+@Builder
 public class ProductDetailResponse {
 
     private Long id;

src/main/java/com/landvive/summer/mvc/entity/Category.java

@@ -1,17 +1,27 @@
 package com.landvive.summer.mvc.entity;
 
-import lombok.AllArgsConstructor;
-import lombok.Builder;
-import lombok.Getter;
-import lombok.Setter;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import lombok.*;
 
+import javax.persistence.*;
+import java.util.List;
+
+@Entity
 @Getter
 @Setter
 @Builder
 @AllArgsConstructor
+@NoArgsConstructor
+@Table(name= "category")
 public class Category {
-
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY) // AI 형식으로 만들어짐!
     private Long id;
+
     private String name;
     private Long count; //해당 카테고리의 Product 개수
-}
+
+    @JsonIgnore
+    @OneToMany(mappedBy = "category")
+    private List<Product> productList;
+}

src/main/java/com/landvive/summer/mvc/entity/Product.java

@@ -1,22 +1,29 @@
 package com.landvive.summer.mvc.entity;
 
-import lombok.AllArgsConstructor;
-import lombok.Builder;
-import lombok.Getter;
-import lombok.Setter;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import lombok.*;
 
+import javax.persistence.*;
 import java.time.LocalDateTime;
 
 @Getter
 @Setter
 @Builder
 @AllArgsConstructor
+@NoArgsConstructor
+@Entity
+@Table(name= "product")
 public class Product {
 
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY) // AI 형식으로 만들어짐!
     private Long id;
-    private Long categoryId;
+
     private String name;
     private String description;
     private LocalDateTime createdAt;
 
-}
+    @ManyToOne
+    @JoinColumn(name="categoryId")
+    private Category category;
+}

src/main/java/com/landvive/summer/mvc/repository/CateRepository.java

@@ -0,0 +1,20 @@
+package com.landvive.summer.mvc.repository;
+
+import com.landvive.summer.mvc.entity.Category;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.util.Optional;
+
+public interface CateRepository extends JpaRepository<Category, Long> {
+
+    @Query(value = "SELECT c FROM Category c WHERE c.name = :name")
+    Optional<Category> findByName2(String name);
+
+    @Modifying
+    @Query("UPDATE Category c SET c.count = c.count+1 WHERE c.id = :categoryId")
+    void plusProductCount(Long categoryId);
+
+}