mysql生成随机字符串 - youngperson/study-100 GitHub Wiki

set global log_bin_trust_function_creators = 1;
DROP FUNCTION IF EXISTS rand_string;
DELIMITER $$
CREATE FUNCTION rand_string(n INT)
RETURNS VARCHAR(255)
BEGIN
	DECLARE chars_str varchar(100) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
	DECLARE return_str varchar(255) DEFAULT '';
	DECLARE i INT DEFAULT 0;
	WHILE i < n DO
		SET return_str = concat(return_str,substring(chars_str , FLOOR(1 + RAND()*62 ),1));
		SET i = i +1;
	END WHILE;
	RETURN return_str;
END $$
DELIMITER ;

#改变个数生成自己需要的长度
select rand_string(32);