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| Submitted on: |
11/14/2003 7:09:17 AM |
| By: |
Jonathan Spinks
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| Level: |
Intermediate |
| User Rating: |
Unrated |
| Compatibility: |
SQL Server 2000 |
| Views: |
10227 |
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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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code:
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--**************************************
-- Name: Is Num
-- Description: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.
-- By: Jonathan Spinks
--
--This code is copyrighted and has-- limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.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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Other 3 submission(s) by this author
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Your Vote
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Other User Comments
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 3/30/2007 8:17:29 AM: Jeff Moden
You don't need the performance hit of a function...
SELECT *
FROM sometable
WHERE somecolumn NOT LIKE '%[^0-9]%'
...but if you want one...
CREATE FUNCTION dbo.IsAllDigits
/********************************************************************
Purpose:
This function will return a 1 if the string parameter contains only
numeric digits and will return a 0 in all other cases.
--Jeff Moden
********************************************************************/
--==== = Declare the I/O parameters
(@MyString VARCHAR(8000))
RETURNS INT
AS
BEGIN
RETURN (SELECT CASE
WHEN @MyString NOT LIKE '%[^0-9]% THEN 1
ELSE 0
END)
END
For more information in ISNumeric, see:
http://www.planet-source-code.com/vb/scripts/BrowseCategoryOrSearchResults.a sp?optSort=Alphabetical&lngWId=5&B1=Quick+Search&txtCriteria=moden&blnWorldDropDownUsed=TRUE&txtMaxN umberOfEntriesPerPage=10&blnResetAllVariables=TRUE
(If this comment was disrespectful, please report it.)
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