mysql SELECT/UPDATE command denied to user 'root'@'localhost' for table 'XXX'

1.mysql -u root -p
輸入密碼
2.GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP ON 數據庫名.* TO 用戶名@‘主機名’ identified by ‘數據庫密碼’;

GRANT all ON 數據庫名.* TO 用戶名@‘主機名’ identified by ‘數據庫密碼’;
3.flush privileges;
4.show grants for ‘用戶名’@‘主機名’;

用戶名：root
主機名：localhost