MySQL 修改用户权限：GRANT ALL PRIVILEGES ON *.* TO ‘root‘@‘%‘ IDENTIFIED BY ‘123456‘ WITH GRANT OPTION；

GRANT ALL PRIVILEGES ON . TO ‘root’@’%’ IDENTIFIED BY ‘123456’ WITH GRANT OPTION;

FLUSH PRIVILEGES;

GRANT：赋权命令
ALL PRIVILEGES：当前用户的所有权限
*.*：当前用户对所有数据库和表的相应操作权限
‘root’@’%’：权限赋给root用户，所有ip都能连接
IDENTIFIED BY ‘123456’：连接时输入密码，密码为123456
WITH GRANT OPTION：允许级联赋权