Check Integer Value with function.

IF EXISTS (SELECT * FROM dbo.sysobjects WHERE id = object_id(N'[dbo].[kk_fn_UTIL_IsINT]') AND xtype IN (N'FN', N'IF', N'TF'))
DROP FUNCTION dbo.kk_fn_UTIL_IsINT
GO
CREATE FUNCTION dbo.kk_fn_UTIL_IsINT
(
@strINT varchar(8000)
)
RETURNS int-- NULL = Bad INT encountered, else cleanedup INT returned
/* WITH ENCRYPTION */
AS
/*
* kk_fn_UTIL_IsINTCheck that a String is a valid INT
*SELECT dbo.kk_fn_UTIL_IsINT(MyINTColumn)
*IF dbo.kk_fn_UTIL_IsINT(MyINTColumn) IS NULL ... Bad INT
*
* Returns:
*
*int valueValid integer
*NULLBad parameter passed
*
* HISTORY:
*
* 30-Sep-2005 Started
*/
BEGIN

DECLARE @intValue int

SELECT @strINT = LTRIM(RTRIM(@strINT)),
@intValue = CASE WHEN @strINT NOT LIKE '%[^0-9]%'
THEN CONVERT(int, @strINT)
ELSE NULL
END
RETURN @intValue

/** TEST RIG

SELECTdbo.kk_fn_UTIL_IsINT('123'),IsNumeric('123')
SELECTdbo.kk_fn_UTIL_IsINT(' 123 '),IsNumeric(' 123 ')
SELECTdbo.kk_fn_UTIL_IsINT('123.'),IsNumeric('123.')
SELECTdbo.kk_fn_UTIL_IsINT('123e2'),IsNumeric('123e2')
SELECTdbo.kk_fn_UTIL_IsINT('XYZ'),IsNumeric('XYZ')
SELECTdbo.kk_fn_UTIL_IsINT('-123'),IsNumeric('-123')
SELECTdbo.kk_fn_UTIL_IsINT('-'),IsNumeric('-')

**/
--==================== kk_fn_UTIL_IsINT ====================--
END
GO