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Is Num

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Submitted on: 11/14/2003 7:09:17 AM
By: Jonathan Spinks 
Level: Intermediate
User Rating: Unrated
Compatibility:SQL Server 2000

Users have accessed this code 1008 times.
 

 
     The is numeric function can return some weird results isnummeric('.'), isnumeric('+'), isnumeric('-'). Yes, Yes and Yes. These are not the most helpfull results. Heres a little function that tells it like it is.
 
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By using this code, you agree to the following terms...   
1) You may use this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.   
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--**************************************
--     
-- Name: Is Num
-- Description:The is numeric function c
--     an return some weird results isnummeric(
--     '.'), isnumeric('+'), isnumeric('-'). Ye
--     s, Yes and Yes. These are not the most h
--     elpfull results. Heres a little function
--      that tells it like it is.
-- By: Jonathan Spinks
--
--This code is copyrighted and has-- limited warranties.Please see http://
--     www.Planet-Source-Code.com/vb/scripts/Sh
--     owCode.asp?txtCodeId=783&lngWId;=5--for details.--**************************************
--     

CREATE function dbo.fnIsNum(@in sql_variant)
returns bit
    Begin
    	DECLARE @char char(255)
    	SET @char = ltrim(cast(@in as char(255)))
    	--Use isnumeric TO CHECK FOR the obvious
    	IF (isnumeric(@char) = 0) RETURN 0
    	--Remove dp TO allow numbers WITH no leading zero ie .321
    	SET @char = replace(@char, '.', '')
    	--Remove minus sign TO allow FOR negative numbers
    	SET @char = replace(@char, '-', '')
    	--If the first character IS a digit THEN it is numeric
    	RETURN CASE WHEN (ascii(@char) > 47 AND ascii(@char) < 58) THEN 1 ELSE 0 END
End


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