@Query
엔티티 조회
public interface MemberRepository extends JpaRepository<Member, Long> {
@Query("select m from Member m where m.username= :username and m.age = :age")
List<Member> findUser(@Param("username") String username, @Param("age") int age);
}값 조회
public interface MemberRepository extends JpaRepository<Member, Long> {
@Query("select m.username from Member m")
List<String> findUsernameList();
}DTO 조회
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