NHibernate的3.2 code ClassMapping的版本属性 [英] NHibernate 3.2 By Code ClassMapping for Version Property

问题描述

什么是映射在SQL Server中时间戳列的正确方法使用NHibernate的新的code根据映射2008数据库？

What is the correct way to map an timestamp column in an SQL Server 2008 database using NHibernate's new code based mappings?

我在我的类属性定义为byte []的，我用我的ClassMapping文件中的以下映射：

I have the property in my class defined as byte[] and I'm using the following mapping in my ClassMapping file:

Version(x => x.RowVersion, mapping =>
   mapping.Generated(VersionGeneration.Always));

然而，NHibernate的期望在此基础上映射一个整数（抛出上插入一个例外）。如果我明确指定映射类型为byte []的，我得到一个异常，指出：System.ArgumentOutOfRangeException：预期类型实施IUserVersionType 参数名：persistentType

However, NHibernate is expecting an integer based on this mapping (throws an exception on inserts). If I explicitly specify the mapping type as byte[], I get an exception stating: "System.ArgumentOutOfRangeException: Expected type implementing IUserVersionType Parameter name: persistentType".

什么是正确的方法来映射新的NHibernate code根据映射自动更新timestamp列？

What is the proper way to map an auto updating timestamp column with the new NHibernate code based mappings?

---修改

我想我有缩小，我需要设置类型的映射BinaryType（一个NHibernate类型实现IVersionType），但BinaryType不具有公共构造......我想我走了想法。

I think I have it narrowed down that I need to set the Type on the mapping to BinaryType (an NHibernate Type that implements IVersionType), but BinaryType doesn't have a public constructor...I think I'm out of ideas.

推荐答案

我们还使用 byte []的版本{获得; } 的版本实施。

We also are using byte[] Version { get; } for version implementation.

下面是出于映射：

Version(x => x.Version)
            .Nullable()
            .CustomSqlType("timestamp")
            .Generated.Always()
            ;

也为更多详细信息，请参阅

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