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CREATE DEFINER=`root`@`localhost` FUNCTION `rand_string`(n INT) RETURNS varchar(255) CHARSET latin1BEGIN    DECLARE chars_str varchar(100) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';    DECLARE return_str varchar(255) DEFAULT '';    DECLARE i INT DEFAULT 0;    WHILE i < n DO        SET return_str = concat(return_str,substring(chars_str , FLOOR(1 + RAND()*62 ),1));        SET i = i +1;    END WHILE;    RETURN return_str;END;