1. 环境
- windows 10；
- MySQL 8.0.20；
- Alchemy 20.5；
- Python 3.7.5；
2. 问题
- alchemy 连接 mysql 数据库时，报 Authentication plugin 'caching_sha2_password' is not supported 错误；
- 报错内容：
Traceback (most recent call last):
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\base.py", line 2339, in _wrap_pool_connect
return fn()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 364, in connect
return _ConnectionFairy._checkout(self)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 778, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 495, in checkout
rec = pool._do_get()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\impl.py", line 140, in _do_get
self.dec_overflow()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\util\langhelpers.py", line 69, in exit
exc_value, with_traceback=exc_tb,
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\util\compat.py", line 178, in raise
raise exception
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\impl.py", line 137, in _do_get
return self._create_connection()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 309, in _create_connection
return _ConnectionRecord(self)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 440, in init
self.__connect(first_connect_check=True)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 661, in _connect
pool.logger.debug("Error on connect(): %s", e)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\util\langhelpers.py", line 69, in exit
exc_value, with_traceback=exc_tb,
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\util\compat.py", line 178, in raise
raise exception
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 656, in __connect
connection = pool.invoke_creator(self)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\strategies.py", line 114, in connect
return dialect.connect(*cargs, *cparams)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\default.py", line 493, in connect
return self.dbapi.connect(cargs, **cparams)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector_init.py", line 179, in connect
return MySQLConnection(*args, kwargs)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\connection.py", line 95, in init
self.connect(kwargs)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\abstracts.py", line 716, in connect
self._open_connection()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\connection.py", line 210, in _open_connection
self._ssl)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\connection.py", line 142, in _do_auth
auth_plugin=self._auth_plugin)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\protocol.py", line 102, in make_auth
auth_data, ssl_enabled)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\protocol.py", line 58, in _auth_response
auth = get_auth_plugin(auth_plugin)(
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\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 supportedThe above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "C:\Users\Administrator\Desktop-\magic_method.py", line 748, in
Base.metadata.create_all(engine)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\sql\schema.py", line 4547, in create_all
ddl.SchemaGenerator, self, checkfirst=checkfirst, tables=tables
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\base.py", line 2097, in _run_visitor
with self._optional_conn_ctx_manager(connection) as conn:
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\contextlib.py", line 112, in enter
return next(self.gen)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\base.py", line 2089, in _optional_conn_ctx_manager
with self._contextual_connect() as conn:
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\base.py", line 2305, in _contextual_connect
self._wrap_pool_connect(self.pool.connect, None),
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\base.py", line 2343, in wrap_pool_connect
e, dialect, self
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\base.py", line 1585, in handle_dbapi_exception_noconnection
sqlalchemy_exception, with_traceback=exc_info[2], from=e
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\util\compat.py", line 178, in raise
raise exception
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\base.py", line 2339, in _wrap_pool_connect
return fn()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 364, in connect
return _ConnectionFairy._checkout(self)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 778, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 495, in checkout
rec = pool._do_get()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\impl.py", line 140, in _do_get
self.dec_overflow()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\util\langhelpers.py", line 69, in exit
exc_value, with_traceback=exc_tb,
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\util\compat.py", line 178, in raise
raise exception
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\impl.py", line 137, in _do_get
return self._create_connection()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 309, in _create_connection
return _ConnectionRecord(self)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 440, in init
self.__connect(first_connect_check=True)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 661, in _connect
pool.logger.debug("Error on connect(): %s", e)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\util\langhelpers.py", line 69, in exit
exc_value, with_traceback=exc_tb,
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\util\compat.py", line 178, in raise
raise exception
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\pool\base.py", line 656, in __connect
connection = pool.invoke_creator(self)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\strategies.py", line 114, in connect
return dialect.connect(*cargs, *cparams)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\sqlalchemy\engine\default.py", line 493, in connect
return self.dbapi.connect(cargs, **cparams)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector_init.py", line 179, in connect
return MySQLConnection(*args, kwargs)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\connection.py", line 95, in init
self.connect(kwargs)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\abstracts.py", line 716, in connect
self._open_connection()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\connection.py", line 210, in _open_connection
self._ssl)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\connection.py", line 142, in _do_auth
auth_plugin=self._auth_plugin)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\protocol.py", line 102, in make_auth
auth_data, ssl_enabled)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\protocol.py", line 58, in _auth_response
auth = get_auth_plugin(auth_plugin)(
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\mysql\connector\authentication.py", line 191, in get_auth_plugin
"Authentication plugin '{0}' is not supported".format(plugin_name))
sqlalchemy.exc.NotSupportedError: (mysql.connector.errors.NotSupportedError) Authentication plugin 'caching_sha2_password' is not supported
3. 原因：
- 在MySQL 8.0以后，默认的身份认证是caching_sha2_password而不是mysql_native_password。
4. 解决
- 打开 mysql cli 终端，输入如下代码：
alter user root@localhost identified with mysql_native_password by 'passwd';
- 查看修改结果：
use mysql;
select * from user\G;
- 修改连接方式：
engine = create_engine(
"mysql+mysqlconnector://username:password@host:port/database?auth_plugin=mysql_native_password"
)
- 连接成功，问题解决；