1. 프로젝트 설정 및 테스트

1. 스프링 설정 파일 작성

application.yml

spring:
	datasource:
	  url: jdbc:h2:mem:test # mem 쓰면 인메모리 데이터베이스를 사용한다.
	  username: sa
		password:
		driver-class-name: org.h2.Driver 

	h2:
		console:
			enabled: true # h2 콘솔에 접근이 가능하다. /h2-console 로 접속 가능.

	jpa:
		hibernate:
			ddl-auto: create # 애플리케이션 시작할 때마다 전체 drop 후 엔티티 기준 테이블 create
		properties:
			hibernate:
#        show_sql: true # jpa가 실행하는 쿼리를 콘솔에 찍는다. (아래 로그방식이 나음)
				format_sql: true # sql 을 이쁘게 보여준다.

logging.level:
	org.hibernate.SQL: debug # hibernate sql 실행 로그를 남긴다.
# org.hibernate.type: trace # 바인딩된 파라미터까지 볼 수 있다.

 

2. Entity 생성

Member.java

package study.datajpa.entity;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

import lombok.Getter;
import lombok.Setter;

@Entity
@Getter @Setter
public class Member {

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private Long id;
	private String username;
}

 

3. JPA 만을 이용한 Repository 생성

MemberJpaRepository

package study.datajpa.repository;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.stereotype.Repository;

import study.datajpa.entity.Member;

@Repository
public class MemberJpaRepository {
	
	@PersistenceContext // spring container가 entitiy manager 주입해줌.
	private EntityManager em;

	public Member save(Member member) {
		em.persist(member);
		return member;
	}

	public Member find(Long id) {
		return em.find(Member.class, id);
	}
}

 

4. JpaRepository 를 상속한 repository 생성 

MemberRepository.java

package study.datajpa.repository;

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

import study.datajpa.entity.Member;

public interface MemberRepository extends JpaRepository<Member, Long> {
}

 

5. 테스트 코드 작성

MemberJpaRepository.java

package study.datajpa.repository;

import static org.junit.jupiter.api.Assertions.*;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.annotation.Rollback;
import org.springframework.transaction.annotation.Transactional;

import study.datajpa.entity.Member;

@SpringBootTest
@Transactional
@Rollback(value = false)
class MemberJpaRepositoryTest {

	@Autowired
	MemberJpaRepository memberJpaRepository;

	@Test
	void memberSaveAndFindTest() {
		//given
		String username = "userA";
		Member member = new Member(username);
		Member savedMember = memberJpaRepository.save(member);

		//when
		Member findMember = memberJpaRepository.find(savedMember.getId());

		//then
		assertEquals(member.getId(), findMember.getId());
		assertEquals(member.getUsername(), findMember.getUsername());
		assertEquals(member, findMember); // 엔티티 동일성 보장
	}
}

MemberRepository.java

package study.datajpa.repository;

import static org.junit.jupiter.api.Assertions.*;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.annotation.Rollback;
import org.springframework.transaction.annotation.Transactional;

import study.datajpa.entity.Member;

@SpringBootTest
@Transactional
@Rollback(false)
public class MemberRepositoryTest {

	@Autowired
	MemberRepository memberRepository;

	@Test
	void memberSaveAndFindByIdTest() {
		// given
		Member member = new Member("memberA");
		Member savedMember = memberRepository.save(member);

		// when
		Member findMember = memberRepository.findById(savedMember.getId()).get();

		// then
		assertEquals(savedMember.getId(), findMember.getId());
		assertEquals(savedMember.getUsername(), findMember.getUsername());
		assertEquals(savedMember, findMember);
	}
}

 

 

출처

김영한 - 스프링 데이터 JPA

https://inf.run/HTDG