[JPA 활용2] API 개발 고급 - 준비

[ API 개발 고급 소개 ]

• 성능에 주로 영향을 주는 것은 조회 API이다.
• 조회 API를 어떻게 최적화시킬 수 있는지를 다뤄보자.

[ 조회용 샘플 데이터 입력 ]

• userA
  • JPA1 BOOK
  • JPA2 BOOK
• userB
  • SPRING1 BOOK
  • SPRING2 BOOK

/**
 * 총 주문 2개
 * - userA
 *      - JPA1 BOOK
 *      - JPA2 BOOK
 * - userB
 *      - SPRING1 BOOK
 *      - SPRING2 BOOK
 */
@Component
@RequiredArgsConstructor
public class InitDb {

    private final InitService initService;

    @PostConstruct
    public void init() {
        initService.dbInit1();
        initService.dbInit2();
    }

    @Component
    @Transactional
    @RequiredArgsConstructor
    static class InitService {

        private final EntityManager em;
        public void dbInit1() {
            Member member = createMember("userA", "서울", "1", "1111");
            em.persist(member);

            Book book1 = createBook("JPA1 BOOK", 10000, 100);
            em.persist(book1);

            Book book2 = createBook("JPA2 BOOK", 20000, 100);
            em.persist(book2);

            OrderItem orderItem1 = OrderItem.createOrderItem(book1, 10000, 1);
            OrderItem orderItem2 = OrderItem.createOrderItem(book2, 20000, 2);

            Order order = Order.createOrder(member, createDelivery(member), orderItem1, orderItem2);
            em.persist(order);
        }

        public void dbInit2() {
            Member member = createMember("userB", "진주", "2", "2222");
            em.persist(member);

            Book book1 = createBook("SPRING1 BOOK", 20000, 200);
            em.persist(book1);

            Book book2 = createBook("SPRING2 BOOK", 40000, 300);
            em.persist(book2);

            OrderItem orderItem1 = OrderItem.createOrderItem(book1, 20000, 3);
            OrderItem orderItem2 = OrderItem.createOrderItem(book2, 40000, 4);

            Delivery delivery = createDelivery(member);
            Order order = Order.createOrder(member, delivery, orderItem1, orderItem2);
            em.persist(order);
        }

        private Member createMember(String name, String city, String street, String zipcode) {
            Member member = new Member();
            member.setName(name);
            member.setAddress(new Address(city, street, zipcode));
            return member;
        }

        private Book createBook(String name, int price, int stockQuantity) {
            Book book = new Book();
            book.setName(name);
            book.setPrice(price);
            book.setStockQuantity(stockQuantity);
            return book;
        }

        private Delivery createDelivery(Member member) {
            Delivery delivery = new Delivery();
            delivery.setAddress(member.getAddress());
            return delivery;
        }
    }
} 

실행 결과

• 데이터가 잘 저장되었다.