#30 jpa basic: inheritance

hello-jpa/src/main/java/com/hello/jpa/inheritance/ex00/Album.java

@@ -0,0 +1,11 @@
+package com.hello.jpa.inheritance.ex00;
+
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+
+@Entity
+@DiscriminatorValue("A")
+public class Album extends Item {
+
+    private String artist;
+}

hello-jpa/src/main/java/com/hello/jpa/inheritance/ex00/Book.java

@@ -0,0 +1,12 @@
+package com.hello.jpa.inheritance.ex00;
+
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+
+@Entity
+@DiscriminatorValue("B")
+public class Book extends Item {
+
+    private String author;
+    private String isbn;
+}

hello-jpa/src/main/java/com/hello/jpa/inheritance/ex00/Item.java

@@ -0,0 +1,41 @@
+package com.hello.jpa.inheritance.ex00;
+
+import javax.persistence.*;
+
+@Entity
+//@Inheritance(strategy = InheritanceType.JOINED)
+//@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
+@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
+@DiscriminatorColumn
+public abstract class Item {
+
+    @Id @GeneratedValue
+    private Long id;
+
+    private String name;
+    private int price;
+
+    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 int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+}

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

@@ -0,0 +1,42 @@
+package com.hello.jpa.inheritance.ex00;
+
+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 {
+            Movie movie = new Movie();
+            movie.setDirector("director");
+            movie.setActor("actor");
+            movie.setName("name");
+            movie.setPrice(1000);
+
+            em.persist(movie);
+
+            em.flush();
+            em.clear();
+
+            Movie findMovie = em.find(Movie.class, movie.getId());
+            System.out.println("findMovie = " + findMovie);
+
+            tx.commit();
+        } catch (Exception e) {
+            tx.rollback();
+        } finally {
+            em.close();
+        }
+
+        emf.close();
+    }
+}

hello-jpa/src/main/java/com/hello/jpa/inheritance/ex00/Movie.java

@@ -0,0 +1,28 @@
+package com.hello.jpa.inheritance.ex00;
+
+import javax.persistence.DiscriminatorValue;
+import javax.persistence.Entity;
+
+@Entity
+@DiscriminatorValue("M")
+public class Movie extends Item {
+
+    private String director;
+    private String actor;
+
+    public String getDirector() {
+        return director;
+    }
+
+    public void setDirector(String director) {
+        this.director = director;
+    }
+
+    public String getActor() {
+        return actor;
+    }
+
+    public void setActor(String actor) {
+        this.actor = actor;
+    }
+}

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

@@ -18,19 +18,24 @@
 <!--        <class>com.hello.jpa.relationmapping.ex02.domain.Member</class>-->
 <!--        <class>com.hello.jpa.relationmapping.ex02.domain.Team</class>-->
 <!--        <class>com.hello.jpa.relationmapping.ex02.domain.Locker</class>-->
-        <class>com.hello.jpa.relationmapping.ex03.domain.Category</class>
-        <class>com.hello.jpa.relationmapping.ex03.domain.Delivery</class>
-        <class>com.hello.jpa.relationmapping.ex03.domain.Item</class>
-        <class>com.hello.jpa.relationmapping.ex03.domain.Member</class>
-        <class>com.hello.jpa.relationmapping.ex03.domain.Order</class>
-        <class>com.hello.jpa.relationmapping.ex03.domain.OrderItem</class>
+<!--        <class>com.hello.jpa.relationmapping.ex03.domain.Category</class>-->
+<!--        <class>com.hello.jpa.relationmapping.ex03.domain.Delivery</class>-->
+<!--        <class>com.hello.jpa.relationmapping.ex03.domain.Item</class>-->
+<!--        <class>com.hello.jpa.relationmapping.ex03.domain.Member</class>-->
+<!--        <class>com.hello.jpa.relationmapping.ex03.domain.Order</class>-->
+<!--        <class>com.hello.jpa.relationmapping.ex03.domain.OrderItem</class>-->
+        <class>com.hello.jpa.inheritance.ex00.Item</class>
+        <class>com.hello.jpa.inheritance.ex00.Album</class>
+        <class>com.hello.jpa.inheritance.ex00.Book</class>
+        <class>com.hello.jpa.inheritance.ex00.Movie</class>
 
         <properties>
             <!-- 필수 속성 -->
             <property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
             <property name="javax.persistence.jdbc.user" value="sa"/>
             <property name="javax.persistence.jdbc.password" value=""/>
-            <property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:~/testdb"/>
+            <property name="javax.persistence.jdbc.url" value="jdbc:h2:tcp://localhost/~/test"/>
+<!--            <property name="javax.persistence.jdbc.url" value="jdbc:h2:mem:~/testdb"/>-->
             <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
 
             <!-- 옵션 -->