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Merge pull request #7257 from amit2103/BAEL-14774

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[BAEL-14774] - Updated Hibernate @OneToMany article code
This commit is contained in:
Loredana Crusoveanu
2019-07-15 12:05:22 +03:00
committed by GitHub
parent 9d51ef22b4 3c92bf292f
commit a5c30d84a6
15 changed files with 18 additions and 20 deletions
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1
persistence-modules/spring-hibernate4/README.md
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@@ -9,7 +9,6 @@
- [Stored Procedures with Hibernate](http://www.baeldung.com/stored-procedures-with-hibernate-tutorial)
- [Hibernate: save, persist, update, merge, saveOrUpdate](http://www.baeldung.com/hibernate-save-persist-update-merge-saveorupdate)
- [Eager/Lazy Loading In Hibernate](http://www.baeldung.com/hibernate-lazy-eager-loading)
- [Hibernate One to Many Annotation Tutorial](http://www.baeldung.com/hibernate-one-to-many)
- [The DAO with Spring and Hibernate](http://www.baeldung.com/persistence-layer-with-spring-and-hibernate)
### Quick Start

37
persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/config/HibernateAnnotationUtil.java
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@@ -1,37 +0,0 @@
package com.baeldung.hibernate.oneToMany.config;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
public class HibernateAnnotationUtil {
private static SessionFactory sessionFactory;
private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate-annotation.cfg.xml
Configuration configuration = new Configuration();
configuration.configure("hibernate-annotation.cfg.xml");
System.out.println("Hibernate Annotation Configuration loaded");
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
System.out.println("Hibernate Annotation serviceRegistry created");
SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
return sessionFactory;
} catch (Throwable ex) {
System.err.println("Initial SessionFactory creation failed." + ex);
ex.printStackTrace();
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
if (sessionFactory == null)
sessionFactory = buildSessionFactory();
return sessionFactory;
}
}

71
persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/main/HibernateManyisOwningSide.java
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@@ -1,71 +0,0 @@
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();
}
}
}
}

60
persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/main/HibernateOneToManyAnnotationMain.java
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@@ -1,60 +0,0 @@
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;
public class HibernateOneToManyAnnotationMain {
public static void main(String[] args) {
Cart cart = new Cart();
Items item1 = new Items(cart);
Items item2 = new Items(cart);
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(item1);
session.save(item2);
// Commit transaction
tx.commit();
System.out.println("Cart ID=" + cart.getId());
System.out.println("item1 ID=" + item1.getId() + ", Foreign Key Cart ID=" + item1.getCart().getId());
System.out.println("item2 ID=" + item2.getId() + ", Foreign Key Cart ID=" + item1.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();
}
}
}
}

67
persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/main/HibernateOneisOwningSide.java
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@@ -1,67 +0,0 @@
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();
}
}
}
}

43
persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/model/Cart.java
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@@ -1,43 +0,0 @@
package com.baeldung.hibernate.oneToMany.model;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
@Entity
@Table(name = "CART")
public class Cart {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "cart_id")
private long id;
@OneToMany(mappedBy = "cart")
private Set<Items> items;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public Set<Items> getItems() {
return items;
}
public void setItems(Set<Items> items) {
this.items = items;
}
}

42
persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/model/CartOIO.java
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@@ -1,42 +0,0 @@
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;
}
}

50
persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/model/Items.java
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@@ -1,50 +0,0 @@
package com.baeldung.hibernate.oneToMany.model;
import javax.persistence.Column;
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 = "ITEMS")
public class Items {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private long id;
@ManyToOne
@JoinColumn(name = "cart_id", nullable = false)
private Cart cart;
// Hibernate requires no-args constructor
public Items() {
}
public Items(Cart c) {
this.cart = c;
}
public Cart getCart() {
return cart;
}
public void setCart(Cart cart) {
this.cart = cart;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
}

47
persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/oneToMany/model/ItemsOIO.java
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@@ -1,47 +0,0 @@
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;
}
}

21
persistence-modules/spring-hibernate4/src/main/resources/hibernate-annotation.cfg.xml
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@@ -1,21 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">mypassword</property>
<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>

12
persistence-modules/spring-hibernate4/src/main/resources/one_to_many.sql
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@@ -1,12 +0,0 @@
CREATE TABLE `Cart` (
`cart_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`cart_id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
CREATE TABLE `Items` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`cart_id` int(11) unsigned NOT NULL,
PRIMARY KEY (`id`),
KEY `cart_id` (`cart_id`),
CONSTRAINT `items_ibfk_1` FOREIGN KEY (`cart_id`) REFERENCES `Cart` (`cart_id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

94
persistence-modules/spring-hibernate4/src/test/java/com/baeldung/hibernate/oneToMany/main/HibernateOneToManyAnnotationMainIntegrationTest.java
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@@ -1,94 +0,0 @@
package com.baeldung.hibernate.oneToMany.main;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import java.util.HashSet;
import java.util.Set;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.dialect.HSQLDialect;
import org.hibernate.service.ServiceRegistry;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import com.baeldung.hibernate.oneToMany.model.Cart;
import com.baeldung.hibernate.oneToMany.model.Items;
public class HibernateOneToManyAnnotationMainIntegrationTest {
private static SessionFactory sessionFactory;
private Session session;
public HibernateOneToManyAnnotationMainIntegrationTest() {
}
@BeforeClass
public static void beforeTests() {
Configuration configuration = new Configuration().addAnnotatedClass(Cart.class).addAnnotatedClass(Items.class)
.setProperty("hibernate.dialect", HSQLDialect.class.getName())
.setProperty("hibernate.connection.driver_class", org.hsqldb.jdbcDriver.class.getName())
.setProperty("hibernate.connection.url", "jdbc:hsqldb:mem:test")
.setProperty("hibernate.connection.username", "sa").setProperty("hibernate.connection.password", "")
.setProperty("hibernate.hbm2ddl.auto", "update");
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
.applySettings(configuration.getProperties()).build();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
}
@Before
public void setUp() {
session = sessionFactory.openSession();
session.beginTransaction();
}
@Test
public void givenSession_checkIfDatabaseIsEmpty() {
Cart cart = (Cart) session.get(Cart.class, new Long(1));
assertNull(cart);
}
@Test
public void givenSession_checkIfDatabaseIsPopulated_afterCommit() {
Cart cart = new Cart();
Set<Items> cartItems = new HashSet<>();
cartItems = cart.getItems();
Assert.assertNull(cartItems);
Items item1 = new Items();
item1.setCart(cart);
assertNotNull(item1);
Set<Items> itemsSet = new HashSet<Items>();
itemsSet.add(item1);
assertNotNull(itemsSet);
cart.setItems(itemsSet);
assertNotNull(cart);
session.persist(cart);
session.getTransaction().commit();
session.close();
session = sessionFactory.openSession();
session.beginTransaction();
cart = (Cart) session.get(Cart.class, new Long(1));
assertNotNull(cart);
}
@After
public void tearDown() {
session.getTransaction().commit();
session.close();
}
@AfterClass
public static void afterTests() {
sessionFactory.close();
}
}