在hiberate4.3.8final中one-to-one的xml中配置信息

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="org.hibernate.entity">
    <class name="Husband">
        <id name="hid">
            <generator class="native"></generator>
        </id>
        <property name="name" />
        <many-to-one name="wife" column="wid" unique="true"></many-to-one>

    </class>

</hibernate-mapping>

重点是：在many-to-one中只要加入 unique="true" 就是one-to-one的关系映射