spring repository 확장하기 with jpa, querydsl

JpaRepository 상속하는 repository interface 생성
자동으로 빈 등록됨
해당 repository는 의존주입 시 사용되는 repository
```
 public interface BoardRepository extends JpaRepository<Board, Long> {}
```

Querydsl을 사용하는 Custom Repository 생성

커스텀 리포지터리 interface 생성

 
 public interface BoardRepositoryCustom {
 
     List<Object> findAll();
     void updateAll(List<Long> ids, Boolean updatedStatus);
 }

BoardRepository(JpaRepository)가 생성힌 Custom repository 또한 상속받도록 추가


 public interface BoardRepository extends JpaRepository<Board, Long>, BoardRepositoryCustom {}

커스텀 리포지터리 확장 클래스 생성
JPAQueryFactory는 별도로 빈등록 필요
네이밍 시 repository + Impl 규칙을 사용하면 자동으로 빈등록 됨.


 @RequiredArgsConstructor
 public class BoardRepositoryImpl implements BoardRepositoryCustom{

    private final EntityManager em;
    private final JPAQueryFactory jpaQueryFactory;

    @Override
    public List<BoardResponseDto> findAll(){

          List<BoardResponseDto> results = jpaQueryFactory.select(
                    Projections.constructor(BoardResponseDto.class,
                            board.id,
                            board.boardType,
                            board.title,
                            board.content,
                            user.id,
                            user.name,
                            board.recruitingCnt,
                            board.startDate,
                            board.endDate,
                            board.createdDate
                            )
                )
                .from(board)
                .innerJoin(board.writer, user)
                         .fetch();

         return new results;
    }

    @Override
    public void updateAll(List<Long> ids, Boolean updatedStatus) {
        jpaQueryFactory.update(board)
                .set(board.updatedStatus, updatedStatus)
                .where(board.id.in(ids))
                .execute();

        em.flush();
        em.clear();
    }
 }