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();
}
}
}