在cmd 中 进入 mysql 的bin 目录
1. 进入cmd：
mysql -u -p
2 .输入你的密码
3 .
grant all privileges on *.* to root@"%" identified by ".";
4.
flush privileges;
如果3提示:
You are not allowed to create a user with GRANT
继续使用
CREATE USER 'root'@'%' IDENTIFIED BY 'Hadoop3!';
grant all privileges on *.* to 'root'@'%';
就可以了
