nHibernate 3.2新增了一種mapping by code的映射策略，很有意思。你可以自定義約定，并且按照約定定制自動映射策略，面對遺留數據庫時這個功能往往很有用，另外，由于mapping by code是基于代碼的（而不是xml文件），對domain object進行重命名的重構操作會非常方便，不用跑到xml映射文件查找字符串了。

要使用Mapping by Code很簡單，

第一步，配置SessionFactory，使nhibernate自動掃描項目中所有繼承ClassMapping的類，并將其解釋為映射

public class NHibernateHelper {private static ISessionFactory _sessionFactory;public static ISessionFactory SessionFactory{get{if (_sessionFactory == null){var configuration = new Configuration();configuration.Configure();var mappers = new ModelMapper();mappers.AddMappings(Assembly.GetExecutingAssembly().GetExportedTypes());var hbmMapping = mappers.CompileMappingForAllExplicitlyAddedEntities();Console.WriteLine(hbmMapping.AsString());configuration.AddDeserializedMapping(hbmMapping, "");_sessionFactory = configuration.BuildSessionFactory();}return _sessionFactory;}}public static ISession OpenSession(){return SessionFactory.OpenSession();} }

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第二步，為每個實體類編寫映射類，映射類只需繼承ClassMapping就可以被nhibernate識別。

關于如何編寫映射類，參考以下文章：

nHibernate Mapping By Code - One to One

nHibernate Mapping By Code - One to Many and Many to One

nHibernate Mapping By Code - Many to Many

參考文章：

NH Mapping by code VS the Untouchable DB

Using NH3.2 mapping by code for Automatic Mapping

NHibernate剖析：Mapping篇之Mapping-By-Code(2):運用ModelMapper

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轉載請注明出處

示例代碼基于nHibernate3.3.1

轉載于:https://www.cnblogs.com/iamzhenyu/archive/2012/07/01/2572216.html

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