<one-to-one name="iUser" constrained="true"></one-to-one> 的含义

<one-to-one name="iUser" constrained="true"></one-to-one>

就是 这个类的 主键参考了 IUser类，这里iuser实施外键。例如，icard 完全参考了 iuser，作为外键和主键。constrained是约束

<?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.sm.hibernate.pojo">
	<class name="ICard" table="icard">
		<id name="id">
			<generator class="foreign">
				<param name="property">iUser</param>
			</generator>
		</id>
		<property name="name" not-null ="true"></property>
		<one-to-one name="iUser" constrained="true"></one-to-one>
    </class>
</hibernate-mapping>