#30 jpa basic: proxy - fetch type

hello-jpa/src/main/java/com/hello/jpa/proxy/ex00/BaseEntity.java

@@ -0,0 +1,45 @@
+package com.hello.jpa.proxy.ex00;
+
+import javax.persistence.MappedSuperclass;
+import java.time.LocalDateTime;
+
+@MappedSuperclass
+public abstract class BaseEntity {
+
+    private String createdBy;
+    private LocalDateTime createdAt;
+    private String updatedBy;
+    private LocalDateTime updatedAt;
+
+    public String getCreatedBy() {
+        return createdBy;
+    }
+
+    public void setCreatedBy(String createdBy) {
+        this.createdBy = createdBy;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public String getUpdatedBy() {
+        return updatedBy;
+    }
+
+    public void setUpdatedBy(String updatedBy) {
+        this.updatedBy = updatedBy;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+}

hello-jpa/src/main/java/com/hello/jpa/proxy/ex00/JpaMain.java

@@ -0,0 +1,47 @@
+package com.hello.jpa.proxy.ex00;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.EntityTransaction;
+import javax.persistence.Persistence;
+import java.util.List;
+
+public class JpaMain {
+
+    public static void main(String[] args) {
+        EntityManagerFactory emf = Persistence.createEntityManagerFactory("hello");
+
+        EntityManager em = emf.createEntityManager();
+
+        EntityTransaction tx = em.getTransaction();
+        tx.begin();
+
+        try {
+            Team team = new Team();
+            team.setName("team");
+            em.persist(team);
+
+            Member member = new Member();
+            member.setName("member");
+            member.setTeam(team);
+            em.persist(member);
+
+            em.flush();
+            em.clear();
+
+            Member m = em.find(Member.class, member.getId());
+
+            List<Member> members = em.createQuery("select m from Member m join fetch m.team", Member.class)
+                    .getResultList();
+
+
+            tx.commit();
+        } catch (Exception e) {
+            tx.rollback();
+        } finally {
+            em.close();
+        }
+
+        emf.close();
+    }
+}

hello-jpa/src/main/java/com/hello/jpa/proxy/ex00/Member.java

@@ -0,0 +1,42 @@
+package com.hello.jpa.proxy.ex00;
+
+import javax.persistence.*;
+
+@Entity
+public class Member extends BaseEntity {
+
+    @Id @GeneratedValue
+    @Column(name = "MEMBER_ID")
+    private Long id;
+
+    @Column(name = "USERNAME")
+    private String name;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "TEAM_ID")
+    private Team team;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Team getTeam() {
+        return team;
+    }
+
+    public void setTeam(Team team) {
+        this.team = team;
+    }
+}

hello-jpa/src/main/java/com/hello/jpa/proxy/ex00/RoleType.java

@@ -0,0 +1,6 @@
+package com.hello.jpa.proxy.ex00;
+
+public enum RoleType {
+
+    USER, ADMIN
+}

hello-jpa/src/main/java/com/hello/jpa/proxy/ex00/Team.java

@@ -0,0 +1,47 @@
+package com.hello.jpa.proxy.ex00;
+
+import javax.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+public class Team extends BaseEntity {
+
+    @Id @GeneratedValue
+    @Column(name = "TEAM_ID")
+    private Long id;
+
+    private String name;
+
+    @OneToMany(mappedBy = "team")
+    private List<Member> members = new ArrayList<>();
+
+    public void addMember(Member member) {
+        member.setTeam(this);
+        members.add(member);
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<Member> getMembers() {
+        return members;
+    }
+
+    public void setMembers(List<Member> members) {
+        this.members = members;
+    }
+}

hello-jpa/src/main/resources/META-INF/persistence.xml

@@ -28,8 +28,10 @@
 <!--        <class>com.hello.jpa.inheritance.ex00.Album</class>-->
 <!--        <class>com.hello.jpa.inheritance.ex00.Book</class>-->
 <!--        <class>com.hello.jpa.inheritance.ex00.Movie</class>-->
-        <class>com.hello.jpa.inheritance.ex01.Member</class>
-        <class>com.hello.jpa.inheritance.ex01.Team</class>
+<!--        <class>com.hello.jpa.inheritance.ex01.Member</class>-->
+<!--        <class>com.hello.jpa.inheritance.ex01.Team</class>-->
+        <class>com.hello.jpa.proxy.ex00.Member</class>
+        <class>com.hello.jpa.proxy.ex00.Team</class>
 
         <properties>
             <!-- 필수 속성 -->