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我有一個關於nHibernate和過濾的問題。我使用nHibernate 2.2,但我認爲這將適用於1.2版本的版本。如何在nHibernate中向祖父母申請過濾器?
我已經創建了一個簡單的例子來說明問題。我有三個域對象:國家,州和城市(假設數據庫表匹配域並且定義了適當的關係。我想使用nHibernate過濾器選擇屬於特定國家的城市。我相信我已經設置了過濾器正確的狀態(父)濾波器的偉大工程
我已經包括域模型和下面我NHibernate的映射我的查詢是一個簡單的HQL語句:。select f from city f
Country
CountryId int
Name string
States list
State
StateId int
Name string
Country object
Cities list
City
CityId int
Name string
State object
NHibernate的映射:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="CMDB.Model" namespace="CMDB.Model">
<class name="Country" table="Country" lazy="false">
<id name="CountryId" type="int" unsaved-value="0">
<generator class="identity" />
</id>
<property name="Name" type="string"/>
<bag name="States" table="State" inverse="true" lazy="false" cascade="all-delete-orphan">
<key column="StateId"/>
<many-to-many class="State" column="StateId"/>
<filter name="ByCountry" condition=":CountryId = CountryId"/>
</bag>
</class>
<class name="State" table="State" lazy="false">
<id name="StateId" type="int" unsaved-value="0">
<generator class="identity" />
</id>
<property name="Name" type="string"/>
<many-to-one name="Country" column="CountryId" class="Country" lazy ="false" />
<bag name="Cities" table="City" inverse="true" lazy="false" cascade="all-delete-orphan">
<key column="CityId"/>
<many-to-many class="City" column="CityId"/>
<filter name="ByState" condition=":StateId = StateId"/>
</bag>
<filter name="ByCountry" condition=":CountryId = CountryId"/>
</class>
<class name="City" table="City" lazy="false">
<id name="CityId" type="int" unsaved-value="0">
<generator class="identity" />
</id>
<property name="Name" type="string"/>
<many-to-one name="State" column="StateId" class="State" lazy ="false" />
<filter name="ByState" condition=":StateId = StateId"/>
</class>
<filter-def name="ByCountry">
<filter-param name="CountryId" type="int"/>
</filter-def>
<filter-def name="ByState">
<filter-param name="StateId" type="int"/>
</filter-def>
</hibernate-mapping>