NHibernate中的标量值函数 [英] Scalar-Valued Function in NHibernate
本文介绍了NHibernate中的标量值函数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我在MS SQL 2005中具有以下标量函数:
I have the following scalar function in MS SQL 2005:
CREATE FUNCTION [dbo].[Distance] ( @lat1 float, @long1 float,@lat2 float, @long2 float )
RETURNS float
AS
BEGIN
RETURN (3958*3.1415926*sqrt((@lat2-@lat1)*(@lat2-@lat1) + cos(@lat2/57.29578)*cos(@lat1/57.29578)*(@long2-@long1)*(@long2-@long1))/180);
END
我需要能够从我的NHibernate查询中调用此函数.我阅读了这篇文章,但是我陷入了一些我不了解的细节.
I need to be able to call this function from my NHibernate queries. I read over this article, but I got bogged down in some details that I didn't understand right away.
如果您在NHibernate中使用了标量函数,能否给我一个示例,说明您的HBM文件如何查找类似这样的函数?
If you've used scalar functions with NHibernate, could you possibly give me an example of how your HBM file would look for a function like this?
推荐答案
这不是在映射文件中而是在方言中可配置的.您需要创建一个自定义方言并注册您的功能.例子:
This is not configurable in the mapping files but in the dialect. You need to create a custom dialect and register your function. Examples:
- http://nhforge.org/blogs/nhibernate/archive/2009/03/13/registering-freetext-or-contains-functions-into-a-nhibernate-dialect.aspx
- http://www.gg3721.com/list/9/23031.html
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