存储过程

Posted 2021-03-18 liehen2046

创建

DROP PROCEDURE IF EXISTS test;
delimiter $$
CREATE PROCEDURE test(IN uid INT)
BEGIN
select * from table_a where userid=uid;
END; $$
delimiter ;
CALL test(100);

随机字符串

substring(MD5(RAND()),1, 5)
-- or
DROP FUNCTION IF EXISTS `random_string`;
delimiter $$
CREATE FUNCTION `random_string`(n int) RETURNS varchar(255) CHARSET utf8
BEGIN
    DECLARE chars_str varchar(100) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    DECLARE return_str varchar(255) DEFAULT '';
    DECLARE i INT DEFAULT 0;
    WHILE i < n
    DO
        SET return_str = concat(return_str,substring(chars_str , FLOOR(1 + RAND()*62 ),1));
        SET i = i +1;
    END WHILE;
    RETURN return_str;
END; $$
SELECT random_string(10);