修改mysql密碼

1.用root 進入mysql後
mysql>set password =password('你的密碼');
mysql>flush privileges;
2.使用GRANT語句 
mysql>grant all on *.* to 'root'@'localhost' IDENTIFIED BY '你的密碼'with grant option ;
mysql>flush privileges;

3.進入mysql庫修改user表
mysql>use mysql;
mysql>update user set password=password('你的密碼') where user='root'; 
mysql>flush privileges;