Page History: File Name Parsing Calculations - SQL Server

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Page Revision: Fri, Oct 23, 2009, 9:29 AM

The following function returns the file extension (including the leading period) of the file specified.

/*
select result = dbo.udsFileExtension('hello.vbs.txt.xml')
*/
ALTER function [dbo].[udsFileExtension]
    (
    @file varchar(max)
    ) returns varchar(max) as begin

declare 
     @result varchar(max)
    ,@pos int

select 
     @pos       = len(@file) - charindex('.', reverse(@file)) + 1
    ,@result    = case 
                    when @file like '%.%' then substring(@file, @pos, len(@file)) 
                    else '' 
                    end

return @result

end