t2一对一，外键引用

<?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>

	<class name="com.tudou.hibernates.entity.Account" table="tb_account">
		<id name="id" type="java.lang.Integer">
			<generator class="native" />
		</id>
		<property name="userName"></property>
		<property name="password"></property>
		<property name="isAct"></property>
		<!-- 一对一此处级联使用all同步更新  左外连接-->
		<one-to-one name="address" class="com.tudou.hibernates.entity.Address"
			cascade="all" outer-join="true"></one-to-one>
	</class>
</hibernate-mapping>

<?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>

	<class name="com.tudou.hibernates.entity.Address" table="tb_address">
		<id name="id" type="java.lang.Integer">
			<generator class="foreign">
				<param name="property">account</param>
			</generator>
		</id>
		<property name="addressName" />
		<property name="postZip"></property>
		<property name="tel"></property>
		<!-- 一对一constrained="true"明确tb_address的主键参考account的id -->
		<one-to-one name="account" class="com.tudou.hibernates.entity.Account"
			constrained="true"></one-to-one>
	</class>
</hibernate-mapping>