NHibernate只能对逆集合生成on delete cascade约束.

NHibernate can only generate on delete cascade constraints on inverse collections.

您的域的示例:

<class name="Movie">
  ...
  <bag name="Showings" inverse="true" cascade="all">
    <key column="Foo" on-delete="cascade" /><!--Here's the magic-->
    <one-to-many class="Showing" />
  </bag>
</class>