spring data jpa : ex domain model test

spring-data-jpa/.gitignore

@@ -35,3 +35,5 @@ out/
 
 ### VS Code ###
 .vscode/
+
+**.db

spring-data-jpa/src/main/java/com/example/springdatajpa/entity/Member.java

@@ -1,25 +1,39 @@
 package com.example.springdatajpa.entity;
 
-import lombok.Getter;
-import lombok.Setter;
+import lombok.*;
 
-import javax.persistence.Entity;
-import javax.persistence.GeneratedValue;
-import javax.persistence.Id;
+import javax.persistence.*;
 
 @Entity
 @Getter @Setter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@ToString(of = {"id", "username", "age"})
 public class Member {
 
     @Id @GeneratedValue
+    @Column(name = "member_id")
     private Long id;
     private String username;
+    private int age;
 
-    protected Member() {
-
-    };
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "team_id")
+    private Team team;
 
     public Member(String username) {
         this.username = username;
     }
+
+    public Member(String username, int age, Team team) {
+        this.username = username;
+        this.age = age;
+        if (team != null) {
+            changeTeam(team);
+        }
+    }
+
+    public void changeTeam(Team team) {
+        this.team = team;
+        team.getMembers().add(this);
+    }
 }

spring-data-jpa/src/main/java/com/example/springdatajpa/entity/Team.java

@@ -0,0 +1,26 @@
+package com.example.springdatajpa.entity;
+
+import lombok.*;
+
+import javax.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+@Getter @Setter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@ToString(of = {"id", "name"})
+public class Team {
+
+    @Id @GeneratedValue
+    @Column(name = "team_id")
+    private Long id;
+    private String name;
+
+    @OneToMany(mappedBy = "team")
+    private List<Member> members = new ArrayList<>();
+
+    public Team(String name) {
+        this.name = name;
+    }
+}

spring-data-jpa/src/main/resources/application.yml

@@ -1,6 +1,6 @@
 spring:
   datasource:
-    url: jdbc:h2:tcp://localhost/~/Desktop/study/Study/spring-data-jpa
+    url: jdbc:h2:tcp://localhost/~/Desktop/study/Study/spring-data-jpa/db
     username: sa
     password:
     driver-class-name: org.h2.Driver

spring-data-jpa/src/test/java/com/example/springdatajpa/entity/MemberTest.java

@@ -0,0 +1,55 @@
+package com.example.springdatajpa.entity;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.annotation.Rollback;
+import org.springframework.transaction.annotation.Transactional;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@SpringBootTest
+@Transactional
+@Rollback(value = false)
+class MemberTest {
+
+    @PersistenceContext
+    EntityManager em;
+
+    @Test
+    void testEntity() {
+        Team teamA = new Team("teamA");
+        Team teamB = new Team("teamB");
+        em.persist(teamA);
+        em.persist(teamB);
+
+        Member member1 = new Member("member1", 10, teamA);
+        Member member2 = new Member("member2", 10, teamA);
+        Member member3 = new Member("member3", 10, teamB);
+        Member member4 = new Member("member4", 10, teamB);
+
+        em.persist(member1);
+        em.persist(member2);
+        em.persist(member3);
+        em.persist(member4);
+
+        // 초기화
+        em.flush(); // 영속성 컨텍스트 -> DB
+        em.clear(); // 영속성 컨텍스트 캐시 삭제
+
+        // 확인
+        List<Member> members = em.createQuery("select m from Member m", Member.class)
+                .getResultList();
+
+        for (Member member : members) {
+            System.out.println("member = " + member);
+            System.out.println("member.getTeam() = " + member.getTeam());
+        }
+    }
+
+
+}