[Week9][Chap4] Feat : @query, 값, DTO 조회하기 (#107)

최송희/data-jpa/src/main/java/study/datajpa/dto/MemberDto.java

@@ -0,0 +1,16 @@
+package study.datajpa.dto;
+
+import lombok.Data;
+
+@Data
+public class MemberDto {
+    private Long id;
+    private String username;
+    private String teamName;
+
+    public MemberDto(Long id, String username, String teamName) {
+        this.id = id;
+        this.username = username;
+        this.teamName = teamName;
+    }
+}

최송희/data-jpa/src/main/java/study/datajpa/repository/MemberRepository.java

@@ -3,6 +3,7 @@
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.query.Param;
+import study.datajpa.dto.MemberDto;
 import study.datajpa.entity.Member;
 
 import java.util.List;
@@ -13,4 +14,10 @@ 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);
+
+    @Query("select m.username from Member m")
+    List<String> findUsernameList();
+
+    @Query("select new study.datajpa.dto.MemberDto(m.id, m.username, t.name) from Member m join m.team t")
+    List<MemberDto> findMemberDto();
 }

최송희/data-jpa/src/test/java/study/datajpa/repository/MemberRepositoryTest.java

@@ -6,7 +6,9 @@
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.annotation.Rollback;
 import org.springframework.transaction.annotation.Transactional;
+import study.datajpa.dto.MemberDto;
 import study.datajpa.entity.Member;
+import study.datajpa.entity.Team;
 
 import java.util.List;
 import java.util.Optional;
@@ -19,6 +21,7 @@
 @Rollback(false)
 class MemberRepositoryTest {
     @Autowired MemberRepository memberRepository;
+    @Autowired TeamRepository teamRepository;
 
     @Test
     public void testMember(){
@@ -90,4 +93,35 @@ public void testQuery(){
         assertThat(result.get(0)).isEqualTo(m1);
 
     }
+
+    @Test
+    public void findUsernameList(){
+        Member m1 = new Member("AAA", 10);
+        Member m2 = new Member("BBB", 20);
+
+        memberRepository.save(m1);
+        memberRepository.save(m2);
+
+        List<String> usernameList = memberRepository.findUsernameList();
+        for (String s : usernameList) {
+            System.out.println("s = "+s);
+        }
+
+    }
+
+    @Test
+    public void findMemberDto(){
+        Team team = new Team("teamA");
+        teamRepository.save(team);
+
+        Member m1 = new Member("AAA", 10);
+        memberRepository.save(m1);
+        m1.setTeam(team);
+
+        List<MemberDto> memberDto = memberRepository.findMemberDto();
+        for (MemberDto s : memberDto) {
+            System.out.println("dto = "+s);
+        }
+
+    }
 }