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();
        }
     }