CREATE PROCEDURE `autoInsert`()
 BEGIN
     DECLARE i int default 10000;
     WHILE(i < 20000000) DO
         insert into user(name) values (concat("user",i));
         SET i = i+1;
     END WHILE;
     END

调用存储过程
call autoInsert()

删除存储过程
DROP PROCEDURE IF EXISTS `autoInsert`