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> <!-- 在这里加入判别是那一种邮递方式   -->         <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>

  <!-- 为delivery_type  传递值       Post和Express --> <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', ?)