Python MySQL连接到数据库错误

Question

我正在尝试使用Python和MySQL创建一个小应用程序。我设法使用MySQL连接连接Python和MySQL。但是现在当我尝试运行此脚本来实际连接到数据库时：

import mysql.connector

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

我收到很多错误：

 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)

我尝试了其他连接到数据库的方法，但它们没有用，我现在还不确定该怎么做。

在此先感谢您的帮助！

EDIT1

正如Juergen所说，在修复主机名后，上面的大多数错误都消失了，但新的错误出现了：

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

我想，你的计算机（数据库运行的地方）没有命名为“hostname”：

    host="hostname", 

如果是本地机器，请尝试localhost。 “hostname”只是示例编码中的占位符。你总是要更换这样的。

关于你的编辑：

看起来您的数据库服务器配置错误。也许您需要在错误消息中指定的插件。

Answer 2

试试这个 ：

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

Answer 3

好的，正如上面提到的那样，修复了正确的主机名并返回到旧版安全性以及创建新数据库修复了该问题