공통 인터페이스 기능 : 순수 jpa기반 repository

1. 순수 JPA기반 Repository

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@Repository
public class TeamRepository {

    @PersistenceContext
    private EntityManager em;

    public Team save(Team team){
        em.persist(team);
        return team;
    }

    public void delete(Team team){
        em.remove(team);
    }

    public List<Team> findAll(){
        return em.createQuery("select t from Team t", Team.class).getResultList();
    }

    public Optional<Team> findById(Long id){
        Team findTeam = em.find(Team.class, id);
        return Optional.ofNullable(findTeam);
    }

    public long count(){
        return em.createQuery("select count(t) from Team t", Long.class).getSingleResult();
    }
    
}

아.. 조금 귀찮네.. 같은거 반복..ㅜ

• Optional 로 반환하는 방법
  • Optional.ofNuallable(object) --> object가 null일수도 있고 아닐수도 있고 ㅋㅋ

 

2. Test

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@SpringBootTest
@Transactional
class MemberJpaRepositoryTest {

    @Autowired MemberJpaRepository memberJpaRepository;

    @Test
    public void testMember(){
        Member member = new Member("memberA");
        Member savedMember = memberJpaRepository.save(member);

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

        Assertions.assertThat(findMember.getId()).isEqualTo(savedMember.getId());
        Assertions.assertThat(findMember.getUserName()).isEqualTo(savedMember.getUserName());
        Assertions.assertThat(findMember).isEqualTo(member);

    }


    @Test
    public void basicCRUD(){
        Member member1 = new Member("member1");
        Member member2 = new Member("member2");
        memberJpaRepository.save(member1);
        memberJpaRepository.save(member2);

        Member findMember1 = memberJpaRepository.findById(member1.getId()).get();
        Member findMember2 = memberJpaRepository.findById(member2.getId()).get();

        //단건조회 검증
        Assertions.assertThat(findMember1.getId()).isEqualTo(member1.getId());
        Assertions.assertThat(findMember1.getUserName()).isEqualTo(member1.getUserName());
        Assertions.assertThat(findMember2.getId()).isEqualTo(member2.getId());
        Assertions.assertThat(findMember2.getUserName()).isEqualTo(member2.getUserName());

        //리스트 조회 검증
        List<Member> all = memberJpaRepository.findAll();
        Assertions.assertThat(all.size()).isEqualTo(2);
        long count = memberJpaRepository.count();
        Assertions.assertThat(all.size()).isEqualTo(count);

        //삭제
        memberJpaRepository.delete(member1);
        memberJpaRepository.delete(member2);
        long deleteCount = memberJpaRepository.count();
        Assertions.assertThat(deleteCount).isEqualTo(0);
    }

}

 

3. GitHub : 210827 jpa repository

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GitHub - bsh6463/SpringDataJpa