mysql设置指定ip或全部 ip访问的方法

//设置全部ip访问方法一
use mysql; 使用mysql数据库
update user set host = '%'  where user ='root';
flush privileges; //立即生效

//设置全部ip访问方法二
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;
flush privileges; //立即生效

//设置192.168.1.168访问方法一
GRANT ALL PRIVILEGES ON *.* TO 'root'@'192.168.1.168' IDENTIFIED BY 'root' WITH GRANT OPTION;
flush privileges; //立即生效