HIbernate 中的继承映射

数据库中Delivery表：id,recipient,phone,address,postcode,delivery_type,parcel_number,express_company,express_number

新建java projet项目：chapter14_hierarch

Add Hibernate Capalities

在项目的src目录下面：com.b510.examples包中手工编写：

Delivery.java PostDelivery.java ExpressDelivery.java(其中：PostDeliver.java和ExpressDelivery.java都继承Delivery.java)

Delivery.java

代码：

/**
*
*/
package com.b510.examples;

/**
*
* @author XHW
*
* @date 2011-7-9
*
*/
public class Delivery {

private Integer id;
private String recipient;
private String phone;
private String address;
private String postcode;
/**
* @return the id
*/
public Integer getId() {
  return id;
}
/**
* @param id the id to set
*/
public void setId(Integer id) {
  this.id = id;
}
/**
* @return the recipient
*/
public String getRecipient() {
  return recipient;
}
/**
* @param recipient the recipient to set
*/
public void setRecipient(String recipient) {
  this.recipient = recipient;
}
/**
* @return the phone
*/
public String getPhone() {
  return phone;
}
/**
* @param phone the phone to set
*/
public void setPhone(String phone) {
  this.phone = phone;
}
/**
* @return the address
*/
public String getAddress() {
  return address;
}
/**
* @param address the address to set
*/
public void setAddress(String address) {
  this.address = address;
}
/**
* @return the postcode
*/
public String getPostcode() {
  return postcode;
}
/**
* @param postcode the postcode to set
*/
public void setPostcode(String postcode) {
  this.postcode = postcode;
}

}

PostDelivery.java

代码：

/**
*
*/
package com.b510.examples;

/**
*
* @author XHW
*
* @date 2011-7-9
*
*/
public class PostDelivery extends Delivery{

private String parcelNumber;

/**
* @return the parcelNumber
*/
public String getparcelNumber() {
return parcelNumber;
}

/**
* @param parcelNumber the parcelNumber to set
*/
public void setparcelNumber(String parcelNumber) {
this.parcelNumber = parcelNumber;
}
}

ExpressDelivery.java

代码：

/**
*
*/
package com.b510.examples;

/**
*
* @author XHW
*
* @date 2011-7-9
*
*/
public class ExpressDelivery extends Delivery {

private String expressNumber;
private String expressCompany;
/**
* @return the expressNumber
*/
public String getExpressNumber() {
  return expressNumber;
}
/**
* @param expressNumber the expressNumber to set
*/
public void setExpressNumber(String expressNumber) {
  this.expressNumber = expressNumber;
}
/**
* @return the expressCompany
*/
public String getExpressCompany() {
  return expressCompany;
}
/**
* @param expressCompany the expressCompany to set
*/
public void setExpressCompany(String expressCompany) {
  this.expressCompany = expressCompany;
}
}

用Hibernate逆向工程单独生成Delivery.hbm.xml映射文件：

Delivery.hbm.xml

代码：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="com.b510.examples.Delivery" table="delivery" catalog="users">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="increment" />
        </id>
        
        <discriminator column="delivery_type"></discriminator>

        <property name="recipient" type="java.lang.String">
            <column name="recipient" length="200" />
        </property>
        <property name="phone" type="java.lang.String">
            <column name="phone" length="200" />
        </property>
        <property name="address" type="java.lang.String">
            <column name="address" length="400" />
        </property>
        <property name="postcode" type="java.lang.String">
            <column name="postcode" length="10" />
        </property>

<subclass name="com.b510.examples.PostDelivery" discriminator-value="Post">
        <property name="parcelNumber" type="java.lang.String">
            <column name="parcel_number" length="30" />
        </property>
        </subclass>


        <subclass name="com.b510.examples.ExpressDelivery" discriminator-value="Express">
        <property name="expressCompany" type="java.lang.String">
            <column name="express_company" length="40" />
        </property>
        <property name="expressNumber" type="java.lang.String">
            <column name="express_number" length="40" />
        </property>
        </subclass>
    </class>
</hibernate-mapping>

HibernateTest.java

代码：

/**
*
*/
package com.b510.examples;

import org.hibernate.Session;
import org.hibernate.Transaction;

/**
*
* @author XHW
*
* @date 2011-7-9
*
*/
public class HibernateTest {

/**
* @param args
*/
public static void main(String[] args) {
new HibernateTest().insertDelivery();
}

public void insertDelivery() {
  Session session = HibernateSessionFactoryUtil.getSessionFactory()
    .openSession();
  Transaction tx = session.beginTransaction();

  PostDelivery post = new PostDelivery();
  post.setRecipient("Hongten");
  post.setAddress("广州中医药大学");
  post.setPhone("119");
  post.setPostcode("510006");
  post.setparcelNumber("订单号：abc123f23");

  ExpressDelivery express = new ExpressDelivery();
  express.setRecipient("HongWei");
  express.setAddress("云南昆明");
  express.setPhone("123465");
  express.setPostcode("456789");
  express.setExpressNumber("订单号：456qwe87ewer");
  express.setExpressCompany("顺丰快递公司");
  try {
   session.save(post);
   session.save(express);
  } catch (Exception e) {
   e.printStackTrace();
   if (tx.isActive()) {
    tx.rollback();
   }
  }
  session.getTransaction().commit();
}
}

运行效果：

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate:
    select
        max(id)
    from
        delivery
Hibernate:
    insert
    into
        users.delivery
        (recipient, phone, address, postcode, parcel_number, delivery_type, id)
    values
        (?, ?, ?, ?, ?, 'Post', ?)
Hibernate:
    insert
    into
        users.delivery
        (recipient, phone, address, postcode, express_company, express_number, delivery_type, id)
    values
        (?, ?, ?, ?, ?, ?, 'Express', ?)

HIbernate 中的 继承映射

HIbernate 中的继承映射