NHibernate多对多

Question

我有一个遗留数据库,我正在尝试创建一个NHibernate DAL.我对"多对多"表上的映射存在问题.

数据库表:

• studio_Subscribers
• studio_Groups (包含一个IList of Subscribers)
• studio_Subscribers_Groups - 具有主键的多对多表

问题是,当我创建一个SubscriberGroup实例并用Subscribers填充它们时,它们会保存到studio_Subscribers表中,但不会保存到" 多对多"表中.

我弄清楚什么是错的？

studio_Subscribers 表映射:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
    assembly="Meridix.Studio.Common"
    namespace="Meridix.Studio.Common">
    <class name="SubscriberItem" table="studio_Subscribers">
        <id name="StorageId" column="Id" unsaved-value="0" access="nosetter.camelcase">
            <generator class="identity" />
        </id>
        <property name="Id" column="DomainId" not-null="true" />
        <property name="Subscriber" column="Subscriber" not-null="true" length="50" />
        <property name="Description" column="Description" not-null="false" length="100" />
        <property name="Type" column="Type" not-null="true" length="40" 
            type="Meridix.Studio.Data.Repositories.EnumStringTypes.SubscriberTypeEst, Meridix.Studio.Data.Repositories" />
    </class>
</hibernate-mapping>

studio_Groups 表映射:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
    assembly="Meridix.Studio.Common"
    namespace="Meridix.Studio.Common">
    <class name="SubscriberGroup" table="studio_Groups">
        <id name="StorageId" column="Id" unsaved-value="0" access="nosetter.camelcase">
            <generator class="identity" />
        </id>
        <property name="Id" column="DomainId" not-null="true" />
        <property name="Name" column="Name" not-null="true" length="200" />
        <property name="Description" column="Description" not-null="false" length="300" />

        <bag name="Subscribers" table="studio_Groups_Subscribers" access="nosetter.camelcase">
            <key column="GroupId"></key>
            <many-to-many column="SubscriberId" class="SubscriberItem" />
        </bag>
    </class>
</hibernate-mapping>

Answer 1

难道您的订阅者不应该有一个与该组具有多对多关系的合适包吗？

<bag name="Groups" table="studio_Groups_Subscribers" access="nosetter.camelcase">
        <key column="SubscriberId"></key>
        <many-to-many column="GroupId" class="GroupItem" />
</bag>

并且可能在您的 SubscriberItems 集合上有一个cascade =“save-update”，以便保存组将使用来自“另一方”的适当关系更新您的孩子。