Eclipse快速上手Hibernate--4. 继承映射(1)

package javamxj.inheritance.one;

/**

 * @hibernate.subclass

 *   discriminator-value="Dog"

 */

public class Dog extends Animal {

private String category;

public void makeSound() {

System.out.println("汪汪");

}

/**

 * @hibernate.property

 *   length = "24"

 */

public String getCategory() {

return category;

}

public void setCategory(String category) {

this.category = category;

}

}

<?xml version="1.0" encoding="GBK"?>

 hibernate-configuration

  PUBLIC "-//Hibernate/Hibernate Configuration DTD 2.0//EN"

  "http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">





net.sf.hibernate.dialect.MySQLDialect

true

false

root

javamxj

com.mysql.jdbc.Driver

           jdbc:mysql://localhost:3306/HibernateTest?useUnicode=true&amp;characterEncoding=GBK

Demo.java

package javamxj.inheritance.one;

import java.util.Iterator;

import java.util.List;

import net.sf.hibernate.HibernateException;

import net.sf.hibernate.Session;

import net.sf.hibernate.SessionFactory;

import net.sf.hibernate.Transaction;

import net.sf.hibernate.cfg.Configuration;

public class Demo {

public static void main(String[] args) {

try {

new Demo();

} catch (HibernateException he) {

he.printStackTrace();

}

}

public Demo() throws HibernateException {

SessionFactory sf = new Configuration().configure()

.buildSessionFactory();

Session sess = sf.openSession();

Transaction tx = null;

try {

tx = sess.beginTransaction();

Cat cat = new Cat();

cat.setName("小白");

cat.setFurColor("白色");

sess.save(cat);

Dog dog = new Dog();

dog.setName("小黑");

dog.setCategory("京巴狗");

sess.save(dog);

tx.commit();

} catch (HibernateException e) {

if (tx != null)

tx.rollback();

throw e;

} finally {

sess.close();

}

sess = sf.openSession();

tx = null;

try {

tx = sess.beginTransaction();

List animals = sess.find("from " + Animal.class.getName());

for (Iterator it = animals.iterator(); it.hasNext();) {

Animal animal = (Animal) it.next();

System.out.println("动物 '" + animal.getName()

+ "' 所在类是: " + animal.getClass().getName());

System.out.print("发出叫声: ");

animal.makeSound();

}

tx.commit();

} catch (HibernateException e) {

if (tx != null)

tx.rollback();

throw e;

} finally {

sess.close();

}

}

}