尝试使用连接器/Python 时出现错误“用户'root'@'localhost 的访问被拒绝”

Question

I am trying to connect to my local mysql system using python.

I note that I can only login to my mysql system from the console by sudo /usr/bin/mysql -u root -p

I have looked around the web and am very confused by all the suggestions of which none work for me.

Like I tried

mysql> SELECT User, Host, plugin FROM mysql.user;

Which gives me...

+------------------+-----------+-----------------------+
| User             | Host      | plugin                |
+------------------+-----------+-----------------------+
| root             | localhost | mysql_native_password |
| mysql.session    | localhost | mysql_native_password |
| mysql.sys        | localhost | mysql_native_password |
| debian-sys-maint | localhost | mysql_native_password |
| keith            | localhost | mysql_native_password |
+------------------+-----------+-----------------------+

5 rows in set (0.12 sec)

...

...

import mysql.connector

cnx = mysql.connector.connect(user='root', password='#########',
                          host='127.0.0.1',
                          database='SurveyData')
cnx.close()

...

I get the following errors

...

MySQLInterfaceError                       Traceback (most recent call last)
~/miniconda3/lib/python3.7/site-packages/mysql/connector  /connection_cext.py in _open_connection(self)
    199         try:
--> 200             self._cmysql.connect(**cnx_kwargs)
    201         except MySQLInterfaceError as exc:

MySQLInterfaceError: Access denied for user 'root'@'localhost'

During handling of the above exception, another exception occurred:

Answer 1

It seemes that you use root@localhost then connecting. Have you tried root@127.0.0.1?

Also check out: Access Denied for User 'root'@'localhost' (using password: YES) - No Privileges?

Grant Global Privileges To User Account By Command Line. Open a terminal and run below command.

:~$ mysql -u root -p
Enter password: 
mysql> GRANT SELECT ON *.* TO 'root'@'localhost' WITH GRANT OPTION;
Query OK, 0 rows affected (0.00 sec)

Grant Special Schema Privileges To User Account. Open terminal run below command.

:~$ mysql -u root -p
Enter password: 
mysql> GRANT SELECT,UPDATE,INSERT,DELETE ON SurveyData.* TO 'root'@'localhost';
Query OK, 0 rows affected (0.00 sec)
mysql> GRANT ALL PRIVILEGES ON SurveyData.* TO 'root'@'localhost';
Query OK, 0 rows affected (0.00 sec)

I use this script for test:

try:
    connection = mysql.connector.connect(host='localhost',
                                         database='SurveyData',
                                         user='root',
                                         password='########')

    if connection.is_connected():
        db_Info = connection.get_server_info()
        print("Connected to MySQL Server version ", db_Info)
        cursor = connection.cursor()
        cursor.execute("select database();")
        record = cursor.fetchone()
        print("Your connected to database: ", record)

except Error as e:
    print("Error while connecting to MySQL", e)
finally:
    if (connection.is_connected()):
        cursor.close()
        connection.close()
        print("MySQL connection is closed")

Answer 2

Logging in with the root user can be considered a "petential risk" and this explains the blocking of any connection through this user. So the solution is to create a new user and grant them all privileges.

mysql> CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'newpassword';    
mysql> GRANT ALL PRIVILEGES ON *.* TO 'newuser'@'localhost';