Turn a procedure to a user define function

HI there how can I turn this procedure to a user define function?
DECLARE @ReturnCode int

declare @cmd sysname
declare @NumberKey sysname
set @NumberKey = 'B07-100001'
set @cmd = 'dir "E:\Adept Technologies\Documents\Building\'+@NumberKey+'\'+@NumberKey+'_Expired*.doc" /b'

exec @ReturnCode = master..xp_cmdshell @cmd, no_output

-- If @ReturnCode is 0, file exists
-- If @ReturnCode is 1, file does NOT exist
PRINT @ReturnCode

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COHFLAsked:
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
User-defined Functions, 'Limitations and Restrictions' section, fifth bullet point, UDF's cannot call another stored procedure.

So, it appears the answer is 'You can't do that' if the requirements are to create a UDF with a call to xp_cmdshell
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Scott PletcherSenior DBACommented:
XPs are an exception.  You should be fine:

CREATE FUNCTION Check_If_File_Exists (
    @NumberKey sysname
)
RETURNS int
AS
BEGIN
DECLARE @cmd nvarchar(4000)
DECLARE @return_code int
SET @cmd = 'dir /b "E:\Adept Technologies\Documents\Building\'+@NumberKey+'\'+@NumberKey+'_Expired*.doc"'
EXEC @return_code = master.sys.xp_cmdshell @cmd, NO_OUTPUT
RETURN @return_code
END --FUNCTION
0

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Scott PletcherSenior DBACommented:
--Although personally I would make it generic enough to work for any file; it could
--still handle your current case by default:


CREATE FUNCTION Check_If_File_Exists (
     @NumberKey sysname = NULL,
     @FileName sysname = 'E:\Adept Technologies\Documents\Building\$NumberKey$\$NumberKey$_Expired*.doc'
 )
RETURNS int
AS
BEGIN
DECLARE @cmd nvarchar(4000)
DECLARE @return_code int
SET @cmd = 'dir /b "' + REPLACE(@FileName, '$NumberKey$', ISNULL(@NumberKey, '')) + '"'
EXEC @return_code = master.sys.xp_cmdshell @cmd, NO_OUTPUT
RETURN @return_code
END --FUNCTION
GO
0
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