From 3c35236261abe89328329ce00636e42bea824a2a Mon Sep 17 00:00:00 2001
From: haerong22 <haerong22@naver.com>
Date: Wed, 1 Feb 2023 00:44:36 +0900
Subject: [PATCH] #30 jpa basic: proxy - cascade

---
 .../java/com/hello/jpa/proxy/ex01/Child.java  | 41 ++++++++++++++++
 .../com/hello/jpa/proxy/ex01/JpaMain.java     | 44 +++++++++++++++++
 .../java/com/hello/jpa/proxy/ex01/Parent.java | 47 +++++++++++++++++++
 .../main/resources/META-INF/persistence.xml   |  6 ++-
 4 files changed, 136 insertions(+), 2 deletions(-)
 create mode 100644 hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/Child.java
 create mode 100644 hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/JpaMain.java
 create mode 100644 hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/Parent.java

diff --git a/hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/Child.java b/hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/Child.java
new file mode 100644
index 00000000..ec96a26b
--- /dev/null
+++ b/hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/Child.java
@@ -0,0 +1,41 @@
+package com.hello.jpa.proxy.ex01;
+
+import javax.persistence.*;
+
+@Entity
+public class Child {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    private String name;
+
+    @ManyToOne
+    @JoinColumn(name = "parent_id")
+    private Parent parent;
+
+    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 Parent getParent() {
+        return parent;
+    }
+
+    public void setParent(Parent parent) {
+        this.parent = parent;
+    }
+}
diff --git a/hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/JpaMain.java b/hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/JpaMain.java
new file mode 100644
index 00000000..8d6baf0b
--- /dev/null
+++ b/hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/JpaMain.java
@@ -0,0 +1,44 @@
+package com.hello.jpa.proxy.ex01;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.EntityTransaction;
+import javax.persistence.Persistence;
+
+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 {
+
+            Child child1 = new Child();
+            Child child2 = new Child();
+
+            Parent parent = new Parent();
+            parent.addChild(child1);
+            parent.addChild(child2);
+
+            em.persist(parent);
+
+            em.flush();
+            em.clear();
+
+            Parent findParent = em.find(Parent.class, parent.getId());
+            findParent.getChildren().remove(0);
+
+            tx.commit();
+        } catch (Exception e) {
+            tx.rollback();
+        } finally {
+            em.close();
+        }
+
+        emf.close();
+    }
+}
diff --git a/hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/Parent.java b/hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/Parent.java
new file mode 100644
index 00000000..84d05e9e
--- /dev/null
+++ b/hello-jpa/src/main/java/com/hello/jpa/proxy/ex01/Parent.java
@@ -0,0 +1,47 @@
+package com.hello.jpa.proxy.ex01;
+
+import javax.persistence.*;
+import java.util.ArrayList;
+import java.util.List;
+
+@Entity
+public class Parent {
+
+    @Id
+    @GeneratedValue
+    private Long id;
+
+    private String name;
+
+    @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL, orphanRemoval = true)
+    private List<Child> children = new ArrayList<>();
+
+    public void addChild(Child child) {
+        children.add(child);
+        child.setParent(this);
+    }
+
+    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<Child> getChildren() {
+        return children;
+    }
+
+    public void setChildren(List<Child> children) {
+        this.children = children;
+    }
+}
diff --git a/hello-jpa/src/main/resources/META-INF/persistence.xml b/hello-jpa/src/main/resources/META-INF/persistence.xml
index 169d50b1..d36a1ba3 100644
--- a/hello-jpa/src/main/resources/META-INF/persistence.xml
+++ b/hello-jpa/src/main/resources/META-INF/persistence.xml
@@ -30,8 +30,10 @@
 <!--        <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.proxy.ex00.Member</class>
-        <class>com.hello.jpa.proxy.ex00.Team</class>
+<!--        <class>com.hello.jpa.proxy.ex00.Member</class>-->
+<!--        <class>com.hello.jpa.proxy.ex00.Team</class>-->
+        <class>com.hello.jpa.proxy.ex01.Parent</class>
+        <class>com.hello.jpa.proxy.ex01.Child</class>
 
         <properties>
             <!-- 필수 속성 -->