NHibernate：确保外键不为空

Question

有没有办法确保当我在NHibernate中导出模式时，我可以确保某些列不能为空？

例如，在以下情况下，列Doc_ID在ReuploadTable不能为空：

<class name="Test.Generated.BusinessObjects.DocumentStore, DAL" table="document_store" lazy="true"> 
    <id name="Id" column="Id"> 
     <generator class="native" /> 
    </id> 
    <bag name="ReuploadTables" lazy="true" cascade="all-delete-orphan" inverse="true" > 
     <key column="Doc_ID"></key> 
     <one-to-many class="ReuploadTable"></one-to-many> 
    </bag> 
</class> 

<class name="Test.Generated.BusinessObjects.ReuploadTable, DAL" table="reupload_table" lazy="true"> 
    <id name="Id" column="ID"> 
     <generator class="native" /> 
    </id> 
    <property name="ReuploadTimes" column="ReuploadTimes" /> 
    <property name="FilePath" column="FilePath" /> 
    <many-to-one name="DocumentStore" column="Doc_ID" class="DocumentStore" /> 
</class> 

这就是我要做的插入：

Answer 1

也许你可以尝试设置

<key column="Doc_ID" not-null="true"></key>