SpringDataJPA

SPRING DATA JPA

스프링에서 JPA를 편리하게 사용할 수 있도록 지원하는 프로젝트이다.

• 데이터 소스 및 엔티티 매니저 트랜잭션 매니저 설정을 자동으로 해준다.

spring:
  datasource:
    driver-class-name: org.h2.Driver
    url: jdbc:h2:~/order;DB_CLOSE_ON_EXIT=FALSE
    username: sa
    password:

  jpa:
    open-in-view: false
    hibernate:
      ddl-auto: create-drop
    show-sql: true
    properties:
      hibernate.format_sql: true

• 데이터 저장계층에 대한 인터페이스를 지원해줘서, CRUD 작업을 편리하게 할 수 있다.

import org.springframework.data.jpa.repository.JpaRepository;

public interface OrderRepository extends JpaRepository<Order, String> {
}

CRUD

@Test
void JPA_query() {
    Order order = orderRepository.findById(uuid).get(); // SELECT * FROM orders WHERE id = ?
    List<Order> all = orderRepository.findAll(); // SELECT * FROM orders
    orderRepository.existsById(uuid);
}

// 실행결과
Hibernate: select order0_.id as id1_3_0_, order0_.member_id as member_i5_3_0_, order0_.memo as memo2_3_0_, order0_.order_datetime as order_da3_3_0_, order0_.order_status as order_st4_3_0_ from orders order0_ where order0_.id=?
Hibernate: select order0_.id as id1_3_, order0_.member_id as member_i5_3_, order0_.memo as memo2_3_, order0_.order_datetime as order_da3_3_, order0_.order_status as order_st4_3_ from orders order0_
Hibernate: select count(*) as col_0_0_ from orders order0_ where order0_.id=?

메소드 쿼리

https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.query-methods

public interface OrderRepository extends JpaRepository<Order, String> {
		List<Order> findAllByOrderStatus(OrderStatus orderStatus);
		// SELECT * FROM orders WHERE order_status = 'OPEND'
    List<Order> findAllByOrderStatusOrderByOrderDatetime(OrderStatus orderStatus);
		// 		// SELECT * FROM orders WHERE order_status = 'OPEND' ORDER BY order_datetiem
}

@Test
void NAMED_QUERY() {
    orderRepository.findAllByOrderStatus(OrderStatus.OPENED);
    orderRepository.findAllByOrderStatusOrderByOrderDatetime(OrderStatus.OPENED);
}

// 실행 결과
Hibernate: select order0_.id as id1_3_, order0_.member_id as member_i5_3_, order0_.memo as memo2_3_, order0_.order_datetime as order_da3_3_, order0_.order_status as order_st4_3_ from orders order0_ where order0_.order_status=?
Hibernate: select order0_.id as id1_3_, order0_.member_id as member_i5_3_, order0_.memo as memo2_3_, order0_.order_datetime as order_da3_3_, order0_.order_status as order_st4_3_ from orders order0_ where order0_.order_status=? order by order0_.order_datetime asc

커스텀 쿼리

public interface OrderRepository extends JpaRepository<Order, String> {
		...
    @Query("SELECT o FROM Order AS o WHERE o.memo LIKE %?1%")
    Optional<Order> findByMemo(String memo);
}

@Test
void NAMED_QUERY() {
    Optional<Order> order = orderRepository.findByMemo("부재시");

    Order entity = order.get();
    log.info("{}", entity.getMemo());
}

// 실행 결과
Hibernate: select order0_.id as id1_3_, order0_.member_id as member_i5_3_, order0_.memo as memo2_3_, order0_.order_datetime as order_da3_3_, order0_.order_status as order_st4_3_ from orders order0_ where order0_.memo like ?
2021-09-11 15:46:04.524  INFO 19811 --- [           main] c.k.l.domain.order.OrderRepositoryTest   : 부재시 전화주세요.

참고