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#1 - MultipleBagFetchException 해결방법 2 - List 자료형 + BatchSize
- 도메인의 자료형을 변경해야한다는 단점 해결 - Pagination이 메모리에서 수행되는 점 해결
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90
jpa-lab/src/test/java/me/iseunghan/jpalab/repository/Team_MultipleBagEx_Solution2_Test.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package me.iseunghan.jpalab.repository; | ||
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| import jakarta.persistence.EntityManager; | ||
| import jakarta.persistence.PersistenceContext; | ||
| import me.iseunghan.jpalab.entity.Member; | ||
| import me.iseunghan.jpalab.entity.Sponsor; | ||
| import me.iseunghan.jpalab.entity.Team; | ||
| import org.junit.jupiter.api.AfterEach; | ||
| import org.junit.jupiter.api.BeforeEach; | ||
| import org.junit.jupiter.api.DisplayName; | ||
| import org.junit.jupiter.api.Test; | ||
| import org.springframework.beans.factory.annotation.Autowired; | ||
| import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase; | ||
| import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest; | ||
| import org.springframework.data.domain.PageRequest; | ||
| import org.springframework.test.context.TestPropertySource; | ||
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| import java.util.List; | ||
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| import static org.assertj.core.api.Assertions.assertThat; | ||
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| @DataJpaTest | ||
| @AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE) | ||
| @TestPropertySource(properties = { | ||
| "spring.jpa.properties.hibernate.default_batch_fetch_size=10", | ||
| }) | ||
| public class Team_MultipleBagEx_Solution2_Test { | ||
| @Autowired private MemberRepository memberRepository; | ||
| @Autowired private TeamRepository teamRepository; | ||
| @PersistenceContext | ||
| private EntityManager em; | ||
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| @BeforeEach | ||
| void setup() { | ||
| System.out.println("----------setup start-----------"); | ||
| Team team = Team.builder().name("team1").build(); | ||
| team.addMember(Member.builder().name("member11").build()); | ||
| team.addMember(Member.builder().name("member12").build()); | ||
| team.addSponsor(Sponsor.builder().name("sponsor11").build()); | ||
| teamRepository.save(team); | ||
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| Team team2 = Team.builder().name("team2").build(); | ||
| team2.addMember(Member.builder().name("member21").build()); | ||
| team2.addMember(Member.builder().name("member22").build()); | ||
| team2.addSponsor(Sponsor.builder().name("sponsor21").build()); | ||
| teamRepository.save(team2); | ||
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| Team team3 = Team.builder().name("team3").build(); | ||
| team3.addMember(Member.builder().name("member31").build()); | ||
| team3.addMember(Member.builder().name("member32").build()); | ||
| team3.addSponsor(Sponsor.builder().name("sponsor31").build()); | ||
| teamRepository.save(team3); | ||
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| clearPersistenceContext(); | ||
| System.out.println("----------setup end-----------"); | ||
| } | ||
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| @AfterEach | ||
| void clear() { | ||
| System.out.println("----------clear start-----------"); | ||
| memberRepository.deleteAll(); | ||
| teamRepository.deleteAll(); | ||
| clearPersistenceContext(); | ||
| System.out.println("----------clear end-----------"); | ||
| } | ||
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| private void clearPersistenceContext() { | ||
| em.flush(); | ||
| em.clear(); | ||
| } | ||
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| @DisplayName("둘 이상의 컬렉션을 페치조인할 수 없다 -> Fetch Join(x) + BatchSize를 이용해 해결") | ||
| @Test | ||
| void Over_Two_collection_Not_Used_fetchJoin_and_Use_BatchSize() throws Exception { | ||
| System.out.println("--------Over_Two_collection_Not_Used_fetchJoin_and_Use_BatchSize START-------------"); | ||
| // when | ||
| List<Team> teams = teamRepository.findAll(PageRequest.of(0, 3)).getContent(); | ||
| assertThat(teams).hasSize(3); | ||
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| // then | ||
| System.out.println("--------Over_Two_collection_Not_Used_fetchJoin_and_Use_BatchSize MID-------------"); | ||
| teams.forEach(team -> { | ||
| System.out.println(team.getName()); | ||
| team.getMembers().stream().map(Member::getName).forEach(System.out::println); | ||
| team.getSponsors().stream().map(Sponsor::getName).forEach(System.out::println); | ||
| }); | ||
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| System.out.println("--------Over_Two_collection_Not_Used_fetchJoin_and_Use_BatchSize END-------------"); | ||
| } | ||
| } |