在MySQL上授予权限错误

我是新的MySQLpipe理员，通常使用Phpmyadmin或MySql工作台来pipe理机器。 我在尝试授予用户访问数据库的权限时遇到了问题，希望能够得到一些帮助。

[root@server20039]# mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 21 Server version: 5.5.29 MySQL Community Server (GPL) Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> GRANT ALL ON *.* TO 'maintenance'@'localhost' IDENTIFIED BY 'qwerty' WITH GRANT OPTION; ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES) 

然后我尝试了这个，仍然有相同的错误

 GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'qwerty' WITH GRANT OPTION; 

和这个

 GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY PASSWORD 'qwerty' WITH GRANT OPTION; FLUSH PRIVILEGES; 

我真的可以用一只手弄清楚这一点！

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 mysql> SELECT CURRENT_USER(); +----------------+ | CURRENT_USER() | +----------------+ | root@localhost | +----------------+ 1 row in set (0.00 sec) 

 mysql> SHOW GRANTS; +----------------------------------------------------------------------------------------------------------------------------------------+ | Grants for root@localhost | +----------------------------------------------------------------------------------------------------------------------------------------+ | GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*03465AB87C2B44D98228458669A91479C2BAAA6C' WITH GRANT OPTION | | GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION | +----------------------------------------------------------------------------------------------------------------------------------------+ 2 rows in set (0.00 sec)