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True WHOLE NUMBER function.


True WHOLE NUMBER function.

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pcq0125
pcq0125
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I need to create a true WHOLE NUMBER function that does not contains -+?/ and all operators or funny characters.After I created the function below it seems like it will still accept '+' or anything returns 0 or >. Please advise. Thanks.


select dbo.fn_ISTRUEWholeNumber(+6)

and the result returns 1



Below is my function
-------------------------------------------


-- =============================================
-- Drop Function
-- =============================================
IF EXISTS ( select * from information_schema.routines
where SPECIFIC_SCHEMA = 'dbo' and SPECIFIC_NAME = N'fn_ISINTEGER' and ROUTINE_TYPE = 'FUNCTION ' )
DROP FUNCTION dbo.fn_ISTRUEWholeNumber
go

-- =============================================
-- Create Function
-- =============================================
CREATE FUNCTION dbo.fn_ISTRUEWholeNumber
(
@strToBeEval varchar(1000) -- enlarge this if needed
)
RETURNS bit

AS
BEGIN
DECLARE @bitReturn bit
IF @strToBeEval LIKE '%[^0-9]%'
SET @bitReturn = 0
ELSE
SET @bitReturn = 1

RETURN @bitReturn
END


GO
Jeff Moden
Jeff Moden
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Group: General Forum Members
Points: 45024 Visits: 39890
You already have a true whole number function and it works well. The only problem is with how you tested it... you've passed a numeric value to the function and +6 is not a naturally occuring numeric. The "+" is nothing more than a formatting symbol in this case.

Any conversion from +6 without single quotes to a varchar whether in your function or not, will result in just a '6'. Further, no natural numeric datatype will actually store the "+" sign so, if it's a number, you don't have to worry about testing for a plus sign.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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pcq0125
pcq0125
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Group: General Forum Members
Points: 106 Visits: 371
THanks.
Go


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