SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


True WHOLE NUMBER function.


True WHOLE NUMBER function.

Author
Message
pcq0125
pcq0125
Ten Centuries
Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)

Group: General Forum Members
Points: 1246 Visits: 371
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
SSC Guru
SSC Guru (431K reputation)SSC Guru (431K reputation)SSC Guru (431K reputation)SSC Guru (431K reputation)SSC Guru (431K reputation)SSC Guru (431K reputation)SSC Guru (431K reputation)SSC Guru (431K reputation)

Group: General Forum Members
Points: 431013 Visits: 43469
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.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
pcq0125
pcq0125
Ten Centuries
Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)Ten Centuries (1.2K reputation)

Group: General Forum Members
Points: 1246 Visits: 371
THanks.
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum







































































































































































SQLServerCentral


Search