MySQL基础

-- 用户表
CREATE TABLE `user` (
  `id` int NOT NULL AUTO_INCREMENT,
  `name` varchar(30) DEFAULT NULL,
  `age` int DEFAULT NULL,
  `create_time` datetime DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `idx_age` (`age`)
) ;


-- 随机字符串函数
# SET GLOBAL log_bin_trust_function_creators = 1;
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;


-- 存储过程
CREATE  PROCEDURE `add_user`(IN n int)
BEGIN
    DECLARE i INT DEFAULT 1;
WHILE (i <= n ) DO
INSERT into user  (name,age,create_time ) VALUEs (rand_string(20), FLOOR(RAND() * 100) ,now() );
set i=i+1;
END WHILE;
END;

-- 调用
CALL add_user(100000)