Credits:
Author: Various (incl. Pinal Dave and the original 2000/5 from PDreyer
Date: 9 Jul 2008
Description
When I went to publish this tip, I looked at the code i had stored and something didn't seem quite right. It had become corrupted over the years. I searched out a much better function-based version which is published below and is valid for all versions of SQL Server.
However, from SQL 2008 onwards, the CAST/CONVERT functions are able to perform this conversion directly, with the HEX represented as either a VARBINARY token, or a HEX character string with or without the '0x' prefix.
Code
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-- FOR SQL 2000/2005 (and 2008/12 if required)
CREATE FUNCTION dbo.fn_Hex2BigInt(@s VARCHAR(16)) --Convert hex to bigint
RETURNS BIGINT -- e.g. select dbo.fn_Hex2BigInt('7ff2a5')
AS
BEGIN
DECLARE
@i INT,
@len INT,
@c CHAR(1),
@result BIGINT
SELECT @s=UPPER(@s)
SELECT
@len=LEN(@s),
@i=@len,
@result= CASE
WHEN @len>0 THEN 0
END
WHILE (@i>0)
BEGIN
SELECT
@c=SUBSTRING(@s,@i,1),
@result=@result
+(ASCII(@c)
-( CASE
WHEN @c BETWEEN 'A' AND 'F' THEN 55
ELSE CASE
WHEN @c BETWEEN '0' AND '9' THEN 48
END
END
)) * POWER(16.,@len-@i),
@i=@i-1
END -- while
RETURN @result
END -- function |
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-- for SQL 2008 , 2008R2, 2012
DECLARE @s VARCHAR(16)
--for a hex string that has no '0x' prefix
SELECT @s = '7ff2a5'
SELECT CAST(CONVERT(VARBINARY, @s, 2) AS BIGINT)
--for a hex string that has an '0x' prefix
SELECT @s = '0x7ff2a5'
SELECT CAST(CONVERT(VARBINARY, @s, 1) AS BIGINT) |
 Updating... Convert Hext to BigInt.sql (1k) Andy Hughes, Jun 7, 2012, 10:54 AM
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