hibernate <one-to-one>出错急！

Question

Employee.hbm.xml中：
<one-to-one name="person" class="Person"/>Person.hbm.xml中
<class name="person" table="PERSON">
    <id name="id" column="PERSON_ID">
        <generator class="foreign">
            <param name="property">employee</param>
        </generator>
    </id>
    ...
    <one-to-one name="employee"
        class="Employee"
        constrained="true"/>
</class>

Answer 1

真的好用了耶，我的为什么不好使阿？是差在<generator class="foreign">，还是<param name="property">employee</param>？<generator class="foreign">
    <param name="property">employee</param>
</generator>