Python MySQL连接数据库错误

Question

I'm trying to create a small app with Python and MySQL. I managed to connect Python and MySQL using the MySQL connection. But now when I try to run this script to actually connect to the database:

import mysql.connector

mydb = mysql.connector.connect(
    passwd="12345", 
    db="DB", 
    host="hostname", 
    user="root"
    )
print(mydb)

I get a lot of errors like:

 File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\network.py", line 485, in open_connection
socket.SOL_TCP)

File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\socket.py", line 748, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno 11001] getaddrinfo failed
File "c:/Users/Krystian/Desktop/DB/db.py", line 7, in <module>
    user="root"

  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\__init__.py", line 179, in connect
    return MySQLConnection(*args, **kwargs)
  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\connection.py", line 94, in __init__
    self.connect(**kwargs)
  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\abstracts.py", line 722, in connect
    self._open_connection()
  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\connection.py", line 207, in _open_connection
    self._socket.open_connection()
  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\network.py", line 501, in open_connection
    errno=2003, values=(self.get_address(), _strioerror(err)))
mysql.connector.errors.InterfaceError: 2003: Can't connect to MySQL server on 'hostname:3306' (11001 getaddrinfo failed)

I tried other ways of conecting to Database but they didn't work and I'm not really sure what to do now.

Thanks in advance for any help!

EDIT1

As Juergen mentioned, after fixing the hostname most of the errors above are gone, but new ones showed up:

File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\connection.py", line 94, in __init__
    self.connect(**kwargs)
  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\abstracts.py", line 722, in connect
    self._open_connection()
  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\connection.py", line 211, in _open_connection
    self._ssl)
  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\connection.py", line 141, in _do_auth
    auth_plugin=self._auth_plugin)
  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\protocol.py", line 102, in make_auth
    auth_data, ssl_enabled)
  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\protocol.py", line 58, in _auth_response
    auth = get_auth_plugin(auth_plugin)(
  File "C:\Users\Krystian\AppData\Local\Programs\Python\Python37-32\lib\site-packages\mysql\connector\authentication.py", line 191, in get_auth_plugin
    "Authentication plugin '{0}' is not supported".format(plugin_name))
mysql.connector.errors.NotSupportedError: Authentication plugin 'caching_sha2_password' is not supporte

Answer 1

I guess, your computer (where the database runs) is not named "hostname":

    host="hostname", 

If it is the local machine, try localhost . "hostname" is just a placeholder inside example coding. You always have to replace such.

About your edit:

Looks as your db server is misconfigured. Maybe you need that plugin that is named in the error message.

Answer 2

try this :

mysql.connector.connect(
        host="localhost",
        user="user_name",
        passwd="db_password",
        database="db_name")

Answer 3

好的，如上面的用户所述，已经更正了主机名，并返回到旧版安全性以及创建新数据库的问题得以解决。