mysql生成随机字符串函数分享:mysql截取字符串函数

代码如下:

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 ;