mysql设置外部访问ip

查看哪些用户连接了数据库:

select SUBSTRING_INDEX(host,':',1) as ip , count(*) from information_schema.processlist group by ip;

修改只允许某个用户以某个ip访问数据库:

update user set host='127.0.0.1' where user='usench';

update user set host='localhost' where user='usench';

GRANT ALL PRIVILEGES ON *.* TO 'usench'@'192.168.1.100' IDENTIFIED BY 'spa' WITH GRANT OPTION;
flush privileges;
GRANT ALL PRIVILEGES ON *.* TO 'usench'@'192.168.1.200' IDENTIFIED BY 'spa' WITH GRANT OPTION;
flush privileges;