Eclipse快速上手Hibernate--4. 继承映射(2)

/*
 * Hibernate - 继承映射(每个子类一个表)
 * 创建日期 2005-4-9
 * @author javamxj（分享java快乐）
 * @link  Blog: htpp://javamxj.mblogger.cn  
 *              htpp://blog.csdn.net/javamxj/ 
 */
package javamxj.inheritance.two;

/**
 * @hibernate.class
 */
public class Vehicle {
	private Long id;

	private String name;

	/**
	 * @hibernate.id 
	 *   column="ID" 
	 *   generator-class="hilo" 
	 *   unsaved-value="null"
	 */
	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	/**
	 * @hibernate.property 
	 *   length = "24"
	 */
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

}

package javamxj.inheritance.two;

/**
 * @hibernate.joined-subclass
 * @hibernate.joined-subclass-key 
 *   column="id"
 */
public class Car extends Vehicle {
	private String seat;

	/**
	 * @hibernate.property 
	 *   column = "载客" 
	 *   length = "24"
	 */
	public String getSeat() {
		return seat;
	}

	public void setSeat(String seat) {
		this.seat = seat;
	}
}

package javamxj.inheritance.two;

/**
 * @hibernate.joined-subclass
 * @hibernate.joined-subclass-key 
 *   column="id"
 */
public class Truck extends Vehicle {
	private String load;

	/**
	 * @hibernate.property 
	 *   column = "载重" 
	 *   length = "24"
	 */
	public String getLoad() {
		return load;
	}

	public void setLoad(String load) {
		this.load = load;
	}
}

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

<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 2.0//EN" 
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping
>
    <class
        name="javamxj.inheritance.two.Vehicle"
        dynamic-update="false"
        dynamic-insert="false"
        select-before-update="false"
        optimistic-lock="version"
    >

        <id
            name="id"
            column="ID"
            type="java.lang.Long"
            unsaved-value="null"
        >
            <generator class="hilo">
              <!--  
                  To add non XDoclet generator parameters, create a file named 
                  hibernate-generator-params-Vehicle.xml 
                  containing the additional parameters and place it in your merge dir. 
              --> 
            </generator>
        </id>

        <property
            name="name"
            type="java.lang.String"
            update="true"
            insert="true"
            access="property"
            column="name"
            length="24"
        />

        <!--
            To add non XDoclet property mappings, create a file named
                hibernate-properties-Vehicle.xml
            containing the additional properties and place it in your merge dir.
        -->

        <joined-subclass
            name="javamxj.inheritance.two.Truck"
            dynamic-update="false"
            dynamic-insert="false"
        >
        <key
            column="id"
        />
        <property
            name="load"
            type="java.lang.String"
            update="true"
            insert="true"
            access="property"
            column="载重"
            length="24"
        />

        </joined-subclass>
        <joined-subclass
            name="javamxj.inheritance.two.Car"
            dynamic-update="false"
            dynamic-insert="false"
        >
        <key
            column="id"
        />
        <property
            name="seat"
            type="java.lang.String"
            update="true"
            insert="true"
            access="property"
            column="载客"
            length="24"
        />

        </joined-subclass>

    </class>

</hibernate-mapping>

/*
 * Hibernate - 继承映射(每个子类一个表)
 * 创建日期 2005-4-9
 * @author javamxj（分享java快乐）
 * @link  Blog: htpp://javamxj.mblogger.cn  
 *              htpp://blog.csdn.net/javamxj/ 
 */
package javamxj.inheritance.two;

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();

			Car car = new Car();
			car.setName("奇瑞QQ");
			car.setSeat("4人");
			sess.save(car);

			Truck truck = new Truck();
			truck.setName("一汽解放");
			truck.setLoad("10吨");
			sess.save(truck);

			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 pets = sess.find("from " + Vehicle.class.getName());

			for (Iterator it = pets.iterator(); it.hasNext();) {
				Vehicle vehicle = (Vehicle) it.next();
				System.out.println("车型 " + vehicle.getName()
						+ " its class is: " + vehicle.getClass().getName());
			}

			tx.commit();
		} catch (HibernateException e) {
			if (tx != null)
				tx.rollback();
			throw e;
		} finally {
			sess.close();
		}
	}
}