1.一对一单向主键关联：

（1）基于主键关联的持久化类不能拥有自己的主键生成策略，必须依附于关联类，由关键类来生成主键。

（2）一对一主键映射中，默认了cascade属性。

Eg:Husband类xml配置

<?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.buaa.hibernate.bean">
	<class name="Husband">
		<id name="id" column="id">
			<generator class="foreign">
            	<param name="property">wife</param>
            </generator>
		</id>
		<property name="name"></property>
		<one-to-one name="wife" constrained="true"/>
	</class>
</hibernate-mapping>

Eg:Wife类xml的配置

<?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.buaa.hibernate.bean">
	<class name="Wife">
		<id name="id" column="id">
			<generator class="native"></generator>
		</id>
		<property name="name"></property>
	</class>
</hibernate-mapping>

2.一对一单向外键关联：

Eg:Husband类xml配置

<?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.buaa.hibernate.bean">
	<class name="Husband">
		<id name="id" column="id">
			<generator class="native"/>
		</id>
		<property name="name"></property>
		<many-to-one name="wife" column="wifeId" unique="true"/>
	</class>
</hibernate-mapping>

Eg:Wife类xml配置

<?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.buaa.hibernate.bean">
	<class name="Wife">
		<id name="id" column="id">
			<generator class="native"></generator>
		</id>
		<property name="name"></property>
	</class>
</hibernate-mapping>