mysql連數據庫的時候報錯:

ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'localhost'

先登錄mysql

mysql -u root -p

輸入密碼

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select user,host from user;//查看本機用戶
+------------------+-----------+
| user             | host      |
+------------------+-----------+
| ghl              | %         |
| ngq              | %         |
| root             | %         |
| mysql.infoschema | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
+------------------+-----------+
6 rows in set (0.00 sec)

mysql> ALTER USER 'root'@'%' IDENTIFIED BY '123456';
Query OK, 0 rows affected (0.00 sec)

注意我的root，host是'%'

我之前執行的是:

SET PASSWORD FOR 'root'@'localhost' = PASSWORD('123456');

所以報錯的現在改成:

SET PASSWORD FOR 'root'@%' = PASSWORD('123456');

完美解決，密碼修改成功！