Database clean up

[janeljs]

데이터베이스 초기화 방법에 대해 논의해봅시다.
1안
deleteAll() 메서드로 지운다.

2안
AcceptanceTestBase에 아래 부분을 추가한다.

@Service
@ActiveProfiles("test")
public class DatabaseCleanup implements InitializingBean {
    @PersistenceContext
    private EntityManager entityManager;

    private List<String> tableNames;

    @Override
    public void afterPropertiesSet() {
        tableNames = entityManager.getMetamodel().getEntities().stream()
                .filter(e -> e.getJavaType().getAnnotation(Entity.class) != null)
                .map(e -> CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, e.getName()))
                .collect(Collectors.toList());
    }

    @Transactional
    public void execute() {
        entityManager.flush();
        entityManager.createNativeQuery("SET REFERENTIAL_INTEGRITY FALSE").executeUpdate();

        for (String tableName : tableNames) {
            entityManager.createNativeQuery("TRUNCATE TABLE " + tableName).executeUpdate();
            entityManager.createNativeQuery("ALTER TABLE " + tableName + " ALTER COLUMN ID RESTART WITH 1").executeUpdate();
        }

        entityManager.createNativeQuery("SET REFERENTIAL_INTEGRITY TRUE").executeUpdate();
    }
}

출처: https://github.com/next-step/atdd-subway-admin/blob/jeongminkyo/src/test/java/nextstep/subway/utils/DatabaseCleanup.java

[Dae-Hwa]

2안이랑 똑같이 해도 좋을 것 같네요
레포지토리 테스트에서도 쓸 수 있겠어요

[janeljs]

    @PostConstruct
    public void init() {
        tableNames = entityManager.getMetamodel().getEntities().stream()
                                  .filter(e -> e.getJavaType().getAnnotation(Entity.class) != null)
                                  .map(e -> CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, e.getName()))
                                  .collect(Collectors.toList());
    }

@PostConstruct를 이용하도록 리팩토링했습니다.