[4기 김영주, 소재훈] JPA Mission 1 - 단일 Customer 엔티티를 이용한 CRUD

src/main/java/com/programmers/springbootjpa/controller/CustomerController.java

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+package com.programmers.springbootjpa.controller;
+
+import com.programmers.springbootjpa.dto.CustomerCreateRequest;
+import com.programmers.springbootjpa.dto.CustomerResponse;
+import com.programmers.springbootjpa.dto.CustomerUpdateRequest;
+import com.programmers.springbootjpa.service.CustomerService;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PatchMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/v1/customer")
+@RequiredArgsConstructor
+public class CustomerController {
+
+    private final CustomerService customerService;
+
+    @PostMapping
+    @ResponseStatus(HttpStatus.CREATED)
+    public CustomerResponse createCustomer(@RequestBody CustomerCreateRequest request) {
+        return customerService.createCustomer(request);
+    }
+
+    @GetMapping
+    public List<CustomerResponse> findAllCustomers() {
+        return customerService.findAllCustomers();
+    }
+
+    @PatchMapping("/{id}")
+    public CustomerResponse updateCustomerById(@PathVariable Long id,
+            @RequestBody CustomerUpdateRequest request) {
+        return customerService.updateCustomerById(id, request);
+    }
+
+    @DeleteMapping("/{id}")
+    @ResponseStatus(HttpStatus.NO_CONTENT)
+    public void deleteCustomerById(@PathVariable Long id) {
+        customerService.deleteCustomerById(id);
+    }
+}

src/main/java/com/programmers/springbootjpa/domain/Customer.java

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+package com.programmers.springbootjpa.domain;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Table(name = "customer")
+@Getter
+@NoArgsConstructor
+public class Customer {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(name = "name", nullable = false, length = 30)
+    private String name;
+
+    @Column(name = "age")
+    private Integer age;
+
+    @Column(name = "nick_name", nullable = false, length = 30, unique = true)
+    private String nickName;
+
+    @Column(name = "address", nullable = false, length = 100)
+    private String address;
+
+    @Builder
+    public Customer(String name, Integer age, String nickName, String address) {
+        this.name = name;
+        this.age = age;
+        this.nickName = nickName;
+        this.address = address;
+    }
+
+    public void updateName(String name) {
+        this.name = name;
+    }
+
+    public void updateAge(Integer age) {
+        this.age = age;
+    }
+
+    public void updateAddress(String address) {
+        this.address = address;
+    }
+}

src/main/java/com/programmers/springbootjpa/dto/CustomerCreateRequest.java

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+package com.programmers.springbootjpa.dto;
+
+import com.programmers.springbootjpa.domain.Customer;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Getter
+@NoArgsConstructor
+@AllArgsConstructor
+public class CustomerCreateRequest {
+
+    private String name;
+    private Integer age;
+    private String nickName;
+    private String address;
+
+    public Customer toEntity() {
+        return Customer.builder()
+                .name(name)
+                .age(age)
+                .nickName(nickName)
+                .address(address)
+                .build();
+    }
+}

src/main/java/com/programmers/springbootjpa/dto/CustomerResponse.java

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+package com.programmers.springbootjpa.dto;
+
+import com.programmers.springbootjpa.domain.Customer;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@AllArgsConstructor
+@Getter
+public class CustomerResponse {
+
+    private Long id;
+    private String name;
+    private Integer age;
+    private String nickName;
+    private String address;
+
+    public static CustomerResponse fromEntity(Customer customer) {
+        return new CustomerResponse(
+                customer.getId(),
+                customer.getName(),
+                customer.getAge(),
+                customer.getNickName(),
+                customer.getAddress()
+        );
+    }
+}

src/main/java/com/programmers/springbootjpa/dto/CustomerUpdateRequest.java

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+package com.programmers.springbootjpa.dto;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@NoArgsConstructor
+@Getter
+public class CustomerUpdateRequest {
+
+    private String name;
+    private Integer age;
+    private String address;
+}

src/main/java/com/programmers/springbootjpa/repository/CustomerRepository.java

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+package com.programmers.springbootjpa.repository;
+
+import com.programmers.springbootjpa.domain.Customer;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CustomerRepository extends JpaRepository<Customer, Long> {
+
+}

src/main/java/com/programmers/springbootjpa/service/CustomerService.java

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+package com.programmers.springbootjpa.service;
+
+import com.programmers.springbootjpa.domain.Customer;
+import com.programmers.springbootjpa.dto.CustomerCreateRequest;
+import com.programmers.springbootjpa.dto.CustomerResponse;
+import com.programmers.springbootjpa.dto.CustomerUpdateRequest;
+import com.programmers.springbootjpa.repository.CustomerRepository;
+import java.util.List;
+import java.util.NoSuchElementException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+public class CustomerService {
+
+    private final CustomerRepository customerRepository;
+
+    @Transactional
+    public CustomerResponse createCustomer(CustomerCreateRequest request) {
+        Customer savedCustomer = customerRepository.save(request.toEntity());
+
+        return CustomerResponse.fromEntity(savedCustomer);
+    }
+
+    public List<CustomerResponse> findAllCustomers() {
+        return customerRepository.findAll()
+                .stream()
+                .map(CustomerResponse::fromEntity)
+                .toList();
+    }
+
+    @Transactional
+    public CustomerResponse updateCustomerById(Long id, CustomerUpdateRequest request) {
+        Customer customer = customerRepository.findById(id)
+                .orElseThrow(() -> new NoSuchElementException("해당 ID에 해당하는 구매자가 없습니다."));
+
+        customer.updateName(request.getName());
+        customer.updateAge(request.getAge());
+        customer.updateAddress(request.getAddress());
+
+        return CustomerResponse.fromEntity(customer);
+    }
+
+    @Transactional
+    public void deleteCustomerById(Long id) {
+        if (!customerRepository.existsById(id)) {
+            throw new NoSuchElementException("해당 ID에 해당하는 구매자가 없습니다.");
+        }
+
+        customerRepository.deleteById(id);
+    }
+}

src/main/resources/application.yaml

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+spring:
+  datasource:
+    driver-class-name: org.h2.Driver
+    username: sa
+    password:
+  jpa:
+    hibernate:
+      ddl-auto: create-drop
+    database-platform: org.hibernate.dialect.H2Dialect
+    show-sql: true

src/test/java/com/programmers/springbootjpa/domain/CustomerTest.java

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+package com.programmers.springbootjpa.domain;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.programmers.springbootjpa.dto.CustomerCreateRequest;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+class CustomerTest {
+
+    @Test
+    @DisplayName("Customer 생성 Dto에서 Customer Entity로 정상적으로 변환되는지 테스트한다.")
+    void customerDtoToEntityTest() {
+        CustomerCreateRequest request = new CustomerCreateRequest(
+                "Kim Jae Won",
+                28,
+                "hanjo",
+                "서울시 마포구"
+        );
+
+        Customer actualEntity = request.toEntity();
+
+        Customer expectedEntity = Customer.builder()
+                .name("Kim Jae Won")
+                .age(28)
+                .nickName("hanjo")
+                .address("서울시 마포구")
+                .build();
+
+        assertThat(actualEntity).usingRecursiveComparison().isEqualTo(expectedEntity);
+    }
+}