NHibernate 2. *映射文件：如何定义可空的DateTime类型（DateTime？）？ [英] NHibernate 2.* mapping files: how to define nullable DateTime type (DateTime?)?

问题描述

我知道使用NHibernate 2. *的一个突破性变化就是不再支持NHibernate.Nullables。因此，您在映射文件中使用什么映射可空的DateTime？类型？对于ie：

可以理解不起作用：

  property name =CreateDatecolumn =CreateDatetype =DateTime？ not-null =false/> 
  

不再支持：

 < property name =ModifiedDatecolumn =ModifiedDatetype =Nullables.NHibernate.NullableDateTimeType，Nullables.NHibernatenot-null =false/> 
  

我知道这一定很明显，但我没有找到它！

答案很简单：
NHibernate会反映所讨论的类，并发现该属性的反映类型是DateTime？所有的都是自己的。

感谢@Justice！

解决方案

 < property name =CreatedDate/> 
  

• NHibernate会反映相关课程，发现该物业的反映类型是 DateTime？全部自己。


• NHibernate将假定列名与默认情况下属性名称相同，除非否则你会告诉它。


• NHibernate会假定任何属性都为空（ not-null =false）除非你告诉

如果你真的想要，应该是这样的...

 < property name =CreatedDatetype =System.Nullable`1 [[System.DateTime，mscorlib]]，mscorlib/> 
  

I know one of the breaking changes with NHibernate 2.* is that the NHibernate.Nullables are no longer supported. Therefore, what do you use in your mapping file to map the nullable DateTime? type? For i.e.:

Understandably doesn't work:

<property name="CreateDate" column="CreateDate" type="DateTime?" not-null="false" />

And no longer supported:

<property name="ModifiedDate" column="ModifiedDate" type="Nullables.NHibernate.NullableDateTimeType, Nullables.NHibernate" not-null="false"/>

I know it must be so obvious, but I'm not finding it!

Answer is as simple as: NHibernate will reflect over the class in question and discover that the property's reflected type is DateTime? all on its own.

Thanks @Justice!

解决方案

<property name="CreatedDate" />

• NHibernate will reflect over the class in question and discover that the property's reflected type is DateTime? all on its own.
• NHibernate will assume the column name is by default the same as the property name, unless you tell it otherwise.
• NHibernate will assume that any property is nullable (not-null="false") unless you tell it otherwise.

If you really want, it should be something like ...

<property name="CreatedDate" type="System.Nullable`1[[System.DateTime, mscorlib]], mscorlib" />

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