hibernate one2one 问题

<?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="po.School" table="SCHOOL">

<id name="sid" column="SID" type="java.lang.Integer">
<generator class="assigned"/>
</id>

<property name="sname" column="SNAME" />

<one-to-one name="herder" class="po.Herder" cascade="all"></one-to-one>
</class>

</hibernate-map

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