새로운 식별자 구별하기

@Entity @Getter @EntityListeners(AuditingEntityListener.class) @NoArgsConstructor(access = AccessLevel.PROTECTED) public class Item implements Persistable { @Id private String id; public Item(String a) { id=a; } @CreatedDate private LocalDateTime createDate; @Override public boolean isNew() { return createDate==null; } } import jpa.study_ex01.entity.Item; import org.springframework.data.jpa.repository.JpaRepository; public interface ItemRepository extends JpaRepository { } @...