Hibernate学习笔记-------继承关系映射

继承关系映射配置实例------------>

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.xx.domain"><!-- 继承关系之映射成一张表 --><!-- 父类的也必须加上discriminator-value属性 --><class name="Animal" table="t_animal" discriminator-value="0"><id name="id"><generator class="native" /></id><discriminator column="type" type="int"/><property name="name"/><subclass name="Pepole" discriminator-value="1"><property name="sex" ></property></subclass><subclass name="Dog" discriminator-value="2"><property name="age" ></property></subclass></class> <!-- 继承关系之每个子类映射成一张表 --> <!-- <class name="Animal" table="t_animal"><id name="id"><generator class="native" /></id><property name="name"/><joined-subclass name="Pepole"><key column="animalid"/><property name="sex"></property></joined-subclass><joined-subclass name="Dog"><key column="animalid"/><property name="age"></property></joined-subclass></class> --><!-- 继承关系之鉴别器与内连接相结合 --><!-- <class name="Animal" table="t_animal" discriminator-value="0"><id name="id"><generator class="native" /></id><discriminator column="type" type="int"/><property name="name"/><subclass name="Pepole" discriminator-value="1"><property name="sex" ></property></subclass><subclass name="Dog" discriminator-value="2"><join table="dog"><key column="anmimalid"/><property name="age" ></property></join></subclass></class>--><!-- 每个具体类映射一张独立表 --><!-- 子类的表和父类的表的id不能重复，所以不能用自增 --><!-- <class name="Animal" table="t_animal"><id name="id"><generator class="hilo" /></id><property name="name"/><union-subclass name="Pepole"><property name="sex"/></union-subclass><union-subclass name="Dog"><property name="age"/></union-subclass></class> --></hibernate-mapping>