Navicat鏈接mysql數據庫報錯：1045 - Access denied for user 'root'@'localhost' (using password: YES)

Navicat鏈接mysql數據庫報錯：1045 - Access denied for user 'root'@'localhost' (using password: YES)。

這是數據庫權限的問題，workbench等也會一樣報錯

問題所在：未給root用戶分配全部權限，本地客戶端無權限登陸root用戶。

以root用戶登陸mysql，運行show grants for 'user'@'IP';

show grants for 'root'@'192.168.170.136';
ERROR 1141 (42000): There is no such grant defined for user 'root' on host '192.168.170.136'

show grants for 'root'@'localhost';
+----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost                                                                                                              |
+----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*81F5E21E35407D884A6CD4A731AEBFB6AF209E1B' WITH GRANT OPTION |
+----------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

經過上述兩個查詢語句的對比，說明root用戶只給了本地服務器的訪問權限，而沒有給192.168.170.136客戶端的訪問權限。

也能夠經過查詢mysql的user表來查看用戶權限：

select user,host from mysql.user;

+-------+---------------+
| user  | host          |
+-------+---------------+
| root  | localhost     | 
+-------+---------------+
1 rows in set (0.00 sec)

說明root用戶只對localhost授予了訪問權限。

解決方法：進行root用戶的遠程訪問受權，能夠受權到指定的客戶端IP，也能夠受權爲全部IP均可訪問（host值爲%）：

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;
Query OK, 0 rows affected (0.00 sec)

flush privileges;
Query OK, 0 rows affected (0.00 sec)

select user,host,password from mysql.user;
+-------+---------------+-------------------------------------------+
| user  | host          | password                                  |
+-------+---------------+-------------------------------------------+
| root  | localhost     | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B | 
| root  | %             | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B | 
+-------+---------------+-------------------------------------------+
2 rows in set (0.00 sec)

這樣就ok了。