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--**************************************
-- Name: Base Conversion N to 10
-- Description:Converts any base number (2-36) back to base10
-- By: sp
--
-- Inputs:@Num, @Base
--
-- Returns:VARCHAR(255)
--
--This code is copyrighted and has-- limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=1222&lngWId=5--for details.--**************************************
CREATE FUNCTION [dbo].[fn_BaseNToBase10] (
@Num VARCHAR(255),
@Base TINYINT
)
RETURNS VARCHAR(255)
AS
-- ==============================================================
-- Author: Ian Marran marran@gmail.com
-- Description: Converts any base number (2-36) back to base10
-- ==============================================================
BEGIN
DECLARE
@BaseChars VARCHAR(255),
@ReturnString VARCHAR(255),
@Base10No BIGINT,
@Value INT,
@BaseChar CHAR(1),
@i INT
SET @BaseChars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'
SET @Base10No = 0
IF (@Base BETWEEN 2 AND 36)
BEGIN
SET @i = 0
WHILE @i < LEN(@Num)
BEGIN
SET @i = @i + 1
SET @BaseChar = SUBSTRING(@Num, @i, 1) -- get the character
SET @Value = CHARINDEX(@BaseChar, @BaseChars) - 1 -- work out its equivilent value
IF @Value > @Base - 1 -- error trapping (found a charater out of specified base)
BEGIN
SET @i = LEN(@Num) + 1
SET @ReturnString = 'Ilegal charater (' + @BaseChar + ') for specified base'
END
ELSE
BEGIN
SET @Base10No = @Base10No + @Value --simply add the next value
IF @i < LEN(@Num) --we dont multiply the last digit (unit)
SET @Base10No = @Base10No * @Base -- multiply the total amount by the base value
ELSE -- we are done
SELECT @ReturnString = @Base10No
END
END
END
ELSE
Set @ReturnString = 'Invalid Base (' + @BaseChar + ')'
--SELECT @ReturnString
RETURN @ReturnString
END
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