Hibernate第六天(继承关系)

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例子：

PO类：

父类

package com.lovo.po;public class PetPO {private int id;private String name;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

子类：

package com.lovo.po;public class CatPO extends PetPO {private int fishNum;public int getFishNum() {return fishNum;}public void setFishNum(int fishNum) {this.fishNum = fishNum;}}

package com.lovo.po;public class DogPO extends PetPO {private int boneNum;public int getBoneNum() {return boneNum;}public void setBoneNum(int boneNum) {this.boneNum = boneNum;}}

hbm文件：

<?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.lovo.po.PetPO" table="t_epet"><id name="id" column="f_id" type="int"><generator class="increment"></generator></id><discriminator column="f_type" type="string"></discriminator>//在数据库表里的f_type属性<property name="name" column="f_name" type="string"></property>//普通属性<subclass name="com.lovo.po.CatPO" discriminator-value="C">//discriminator-value的值C在数据库里保存的f_fish值<property name="fishNum" column="f_fish" type="int"></property></subclass><subclass name="com.lovo.po.DogPO" discriminator-value="D"><property name="boneNum" column="f_bone" type="int"></property></subclass></class></hibernate-mapping>

在hibernate.cfg.xml注册