hibernate: how to setup on-delete="cascade" in one-to-one relation

i have to table relation one-to-one: message & scheduled_message

my hibernate config

<class name="Message" table="message">
    <id name="id" column="id">
        <generator class="native" />
    </id>
    <property name="name" column="name" />
            &开发者_开发百科lt;one-to-one name="scheduled">
</class>

<class name="ScheduledMessage" table="scheduled_message">
    <id name="id" column="id">
        <generator class="native" />
    </id>
    <property name="startTime" column="start_time" />
    <property name="stopTime" column="stop_time" />
    <many-to-one name="message" column="message_id"
        unique="true" not-null="true" />
</class>

i want when message is deleted, scheduled_message is deleted too, but i dont know how to add on-delete="cascade" to this relation.

please help me

thanks

Quan

Hibernate docs say that <one-to-one> supports the cascade atribute. So:

<one-to-one name="scheduled" cascade="delete" .... />