Many To One BAEL-2329 (#5878)

* Many To One BAEL-2329

* xml config

persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/main/HibernateManyisOwningSide.java

@@ -0,0 +1,71 @@
+package com.baeldung.hibernate.oneToMany.main;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
+
+import com.baeldung.hibernate.oneToMany.config.HibernateAnnotationUtil;
+import com.baeldung.hibernate.oneToMany.model.Cart;
+import com.baeldung.hibernate.oneToMany.model.Items;
+import com.baeldung.hibernate.oneToMany.model.ItemsOIO;
+
+public class HibernateManyisOwningSide {
+    public static void main(String[] args) {
+
+        Cart cart = new Cart();
+        Cart cart2 = new Cart();
+
+        Items item1 = new Items(cart);
+        Items item2 = new Items(cart2);
+        Set<Items> itemsSet = new HashSet<Items>();
+        itemsSet.add(item1);
+        itemsSet.add(item2);
+
+        cart.setItems(itemsSet);
+
+        
+        
+        SessionFactory sessionFactory = null;
+        Session session = null;
+        Transaction tx = null;
+        try {
+            // Get Session
+            sessionFactory = HibernateAnnotationUtil.getSessionFactory();
+            session = sessionFactory.getCurrentSession();
+            System.out.println("Session created");
+            // start transaction
+            tx = session.beginTransaction();
+            // Save the Model object
+            session.save(cart);
+            session.save(cart2);
+            session.save(item1);
+            session.save(item2);
+            // Commit transaction
+            tx.commit();
+            session = sessionFactory.getCurrentSession();
+            tx = session.beginTransaction();
+
+            item1 = (Items) session.get(Items.class, new Long(1));
+            item2 = (Items) session.get(Items.class, new Long(2));
+            tx.commit();
+            
+         
+            System.out.println("item1 ID=" + item1.getId() + ", Foreign Key CartOIO ID=" + item1.getCart()
+                .getId());
+            System.out.println("item2 ID=" + item2.getId() + ", Foreign Key CartOIO ID=" + item2.getCart()
+                .getId());
+
+        } catch (Exception e) {
+            System.out.println("Exception occured. " + e.getMessage());
+            e.printStackTrace();
+        } finally {
+            if (!sessionFactory.isClosed()) {
+                System.out.println("Closing SessionFactory");
+                sessionFactory.close();
+            }
+        }
+    }
+}

persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/main/HibernateOneisOwningSide.java

@@ -0,0 +1,67 @@
+package com.baeldung.hibernate.oneToMany.main;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.hibernate.Session;
+import org.hibernate.SessionFactory;
+import org.hibernate.Transaction;
+
+import com.baeldung.hibernate.oneToMany.config.HibernateAnnotationUtil;
+import com.baeldung.hibernate.oneToMany.model.CartOIO;
+import com.baeldung.hibernate.oneToMany.model.ItemsOIO;
+
+public class HibernateOneisOwningSide {
+    public static void main(String[] args) {
+
+        CartOIO cart = new CartOIO();
+        CartOIO cart2 = new CartOIO();
+
+        ItemsOIO item1 = new ItemsOIO(cart);
+        ItemsOIO item2 = new ItemsOIO(cart2);
+        Set<ItemsOIO> itemsSet = new HashSet<ItemsOIO>();
+        itemsSet.add(item1);
+        itemsSet.add(item2);
+
+        cart.setItems(itemsSet);
+
+        SessionFactory sessionFactory = null;
+        Session session = null;
+        Transaction tx = null;
+        try {
+            // Get Session
+            sessionFactory = HibernateAnnotationUtil.getSessionFactory();
+            session = sessionFactory.getCurrentSession();
+            System.out.println("Session created");
+            // start transaction
+            tx = session.beginTransaction();
+            // Save the Model object
+            session.save(cart);
+            session.save(cart2);
+            session.save(item1);
+            session.save(item2);
+            // Commit transaction
+            tx.commit();
+
+            session = sessionFactory.getCurrentSession();
+            tx = session.beginTransaction();
+            item1 = (ItemsOIO) session.get(ItemsOIO.class, new Long(1));
+            item2 = (ItemsOIO) session.get(ItemsOIO.class, new Long(2));
+            tx.commit();
+
+            System.out.println("item1 ID=" + item1.getId() + ", Foreign Key CartOIO ID=" + item1.getCartOIO()
+                .getId());
+            System.out.println("item2 ID=" + item2.getId() + ", Foreign Key CartOIO ID=" + item2.getCartOIO()
+                .getId());
+
+        } catch (Exception e) {
+            System.out.println("Exception occured. " + e.getMessage());
+            e.printStackTrace();
+        } finally {
+            if (!sessionFactory.isClosed()) {
+                System.out.println("Closing SessionFactory");
+                sessionFactory.close();
+            }
+        }
+    }
+}

persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/model/CartOIO.java

@@ -0,0 +1,42 @@
+package com.baeldung.hibernate.oneToMany.model;
+
+import java.util.Set;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.OneToMany;
+import javax.persistence.Table;
+
+
+
+@Entity
+@Table(name = "CARTOIO")
+public class CartOIO {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @OneToMany
+    @JoinColumn(name = "cart_id") // we need to duplicate the physical information
+    private Set<ItemsOIO> items;
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+    public Set<ItemsOIO> getItems() {
+        return items;
+    }
+
+    public void setItems(Set<ItemsOIO> items) {
+        this.items = items;
+    }
+
+}

persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/model/ItemsOIO.java

@@ -0,0 +1,47 @@
+package com.baeldung.hibernate.oneToMany.model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.ManyToOne;
+import javax.persistence.Table;
+
+@Entity
+@Table(name = "ITEMSOIO")
+public class ItemsOIO {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private long id;
+
+    @ManyToOne
+    @JoinColumn(name = "cart_id", insertable = false, updatable = false)
+    private CartOIO cart;
+
+    // Hibernate requires no-args constructor
+    public ItemsOIO() {
+    }
+
+    public ItemsOIO(CartOIO c) {
+        this.cart = c;
+    }
+
+    public CartOIO getCartOIO() {
+        return cart;
+    }
+
+    public void setCartOIO(CartOIO cart) {
+        this.cart = cart;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+    }
+
+}

persistence-modules/spring-hibernate4/src/main/resources/hibernate-annotation.cfg.xml

@@ -9,11 +9,13 @@
         <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/spring_hibernate_one_to_many?createDatabaseIfNotExist=true</property>
         <property name="hibernate.connection.username">myuser</property>
         <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
-        
+        <property name="hbm2ddl.auto">create</property>
         <property name="hibernate.current_session_context_class">thread</property>
         <property name="hibernate.show_sql">true</property>
         
         <mapping class="com.baeldung.hibernate.oneToMany.model.Cart"/>
         <mapping class="com.baeldung.hibernate.oneToMany.model.Items"/>
+        <mapping class="com.baeldung.hibernate.oneToMany.model.CartOIO"/>
+        <mapping class="com.baeldung.hibernate.oneToMany.model.ItemsOIO"/>
     </session-factory>
 </hibernate-configuration>