My SQL Hash Coding algorithm for Chinese characters and letters

DELIMITER $$

CREATE

FUNCTION ' Jtorder '. ' F_get_hash_value ' (str VARCHAR (500))
RETURNS BIGINT

BEGIN
/*
* @desc: Get hashvalue of characters
STR: Characters
* @author: Shiyj
Eg:str=abc123
*/
DECLARE result BIGINT;
SET @pos = 1;
SET @hashValue = 0;
--616263313233
SET @szHex = HEX (str);
--12
SET @size = LENGTH (@szHex);
While @pos < @size +1 do
--61
SET @cCh = SUBSTRING (@szHex, @pos, 2);
--The ascii=97 of a
SET @nCh = CAST (ASCII (Unhex (@cCh)) as UNSIGNED);
--97+98+99+49+50+51
SET @hashValue = @hashValue + @nCh;
SET @pos = @pos + 2;
END while;

SET result = @hashValue;
RETURN result;
end$$

DELIMITER;

My SQL Hash Coding algorithm for Chinese characters and letters