[Spring][Spring Data JPA]@Query, Spirng data jpa에서 query문을 쓰고 싶을때

package stduy.datajpa.repository;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import stduy.datajpa.entity.Member;

import java.util.List;

public interface MemberRepository extends JpaRepository<Member, Long> {
    List<Member> findByUsernameAndAgeGreaterThan(String username, int age);

    List<Member> findHelloBy();

    @Query(name = "Member.findByUsername")
    List<Member> findByUsername(@Param("username") String username);

    @Query("select m from Member m where m.usernames = :username and m.age = :age")
    List<Member> findUser(@Param("username") String username, @Param("age") int age);
}

Spring Data JPA에서 Query문을 쓰고 싶을때가 있다. 

@Entity
@NamedQuery(
        name="Member.findByUsername",
        query="select m from Member m where m.username = :username"
)

public class Member {
    @Id
    @GeneratedValue
    @Column(name = "member_id")
    private Long id;
    private String username;
    private int age;

그때에는 @Query(name = "Member.findByUsername")처럼 엔티티에 선언한

NamedQuery를 사용해도 되지만 

@Query("select m from Member m where m.usernames = :username and m.age = :age")

 

직접 입력하는 것도 가능하다.