本节内容
- 说明
- 代码
- 参考资料
说明
NHibernate的强大之处在于其映射，我们在设计Domain中，经常为各种各样的映射感到头痛，为此我把微软SQL Server2000自带的Northwind数据库使用NHibernate映射了一下，需要的请下载其代码，在文章中就不仔细说明了，一切都在代码中。
顺便说一句，其实映射不必这么复杂的写出全部：
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"> <class name="YourApp.Common.DataObjects.Address, YourApp" table="Address"> <id name="Id" type="Int32" unsaved-value="null"> <column name="Id" length="4" sql-type="int" not-null="true" unique="true" index="PK_Address"/> <generator class="native" /> </id> <property name="Address1" type="String"> <column name="Address1" length="255" sql-type="varchar" not-null="true"/> </property> <property name="Address2" type="String"> <column name="Address2" length="255" sql-type="varchar" not-null="false"/> </property> <property name="City" type="String"> <column name="City" length="255" sql-type="varchar" not-null="true"/> </property> <property name="State" type="String"> <column name="`State`" length="2" sql-type="varchar" not-null="true"/> </property> <property name="Zip" type="String"> <column name="Zip" length="12" sql-type="varchar" not-null="true"/> </property> <many-to-one name="Contact" class="YourApp.Common.DataObjects.Contact, YourApp"> <column name="Contact_Id" length="4" sql-type="int" not-null="false"/> </many-to-one> <bag name="BillToOrderHeaders" inverse="true" lazy="true" cascade="all-delete-orphan"> <key column="BillToAddress_Id"/> <one-to-many class="YourApp.Common.DataObjects.OrderHeader, YourApp"/> </bag> <bag name="ShipToOrderHeaders" inverse="true" lazy="true" cascade="all-delete-orphan"> <key column="ShipToAddress_Id"/> <one-to-many class="YourApp.Common.DataObjects.OrderHeader, YourApp"/> </bag> </class> </hibernate-mapping>
其实这样就可以了，不要把默认的都写上去的，我这个例子映射写的最简洁，大家下载看看吧
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="YourApp" namespace="YourApp.Common.DataObjects"> <class name="Address"> <id name="Id"> <generator class="native" /> </id> <property name="Address1" not-null="true" /> <property name="Address2"/> <property name="City" not-null="true"/> <property name="State" length="2" not-null="true"/> <property name="Zip" length="12" not-null="true"/> <many-to-one name="Contact" column="Contact_Id"/> <bag name="BillToOrderHeaders" inverse="true" cascade="all-delete-orphan"> <key column="BillToAddress_Id"/> <one-to-many class="OrderHeader"/> </bag> <bag name="ShipToOrderHeaders" inverse="true" cascade="all-delete-orphan"> <key column="ShipToAddress_Id"/> <one-to-many class="OrderHeader"/> </bag> </class> </hibernate-mapping>
