io.UnsupportedOperation: fileno
[2025-10-07 14:36:06,326] ERROR in app: Exception on / [GET]
Traceback (most recent call last):
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/pymysql/connections.py", line 644, in connect
    sock = socket.create_connection(
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/alt/python311/lib64/python3.11/socket.py", line 863, in create_connection
    raise exceptions[0]
  File "/opt/alt/python311/lib64/python3.11/socket.py", line 848, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 145, in __init__
    self._dbapi_connection = engine.raw_connection()
                             ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 3288, in raw_connection
    return self.pool.connect()
           ^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 452, in connect
    return _ConnectionFairy._checkout(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 1267, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 716, in checkout
    rec = pool._do_get()
          ^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/impl.py", line 169, in _do_get
    with util.safe_reraise():
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/util/langhelpers.py", line 147, in __exit__
    raise exc_value.with_traceback(exc_tb)
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/impl.py", line 167, in _do_get
    return self._create_connection()
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 393, in _create_connection
    return _ConnectionRecord(self)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 678, in __init__
    self.__connect()
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 902, in __connect
    with util.safe_reraise():
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/util/langhelpers.py", line 147, in __exit__
    raise exc_value.with_traceback(exc_tb)
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 898, in __connect
    self.dbapi_connection = connection = pool._invoke_creator(self)
                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/create.py", line 637, in connect
    return dialect.connect(*cargs, **cparams)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/default.py", line 615, in connect
    return self.loaded_dbapi.connect(*cargs, **cparams)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/pymysql/connections.py", line 358, in __init__
    self.connect()
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/pymysql/connections.py", line 711, in connect
    raise exc
pymysql.err.OperationalError: (2003, "Can't connect to MySQL server on 'localhost' ([Errno 111] Connection refused)")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/flask/app.py", line 2190, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/flask/app.py", line 1486, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/flask/app.py", line 1484, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/flask/app.py", line 1469, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/ql.laixeanninh.vn/app.py", line 97, in index
    hoc_vien_list = HocVien.query.order_by(HocVien.id.desc()).limit(5).all()
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/query.py", line 2688, in all
    return self._iter().all()  # type: ignore
           ^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/query.py", line 2842, in _iter
    result: Union[ScalarResult[_T], Result[_T]] = self.session.execute(
                                                  ^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 2262, in execute
    return self._execute_internal(
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 2134, in _execute_internal
    conn = self._connection_for_bind(bind)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 2001, in _connection_for_bind
    return trans._connection_for_bind(engine, execution_options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<string>", line 2, in _connection_for_bind
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/state_changes.py", line 139, in _go
    ret_value = fn(self, *arg, **kw)
                ^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 1126, in _connection_for_bind
    conn = bind.connect()
           ^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 3264, in connect
    return self._connection_cls(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 147, in __init__
    Connection._handle_dbapi_exception_noconnection(
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 2426, in _handle_dbapi_exception_noconnection
    raise sqlalchemy_exception.with_traceback(exc_info[2]) from e
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 145, in __init__
    self._dbapi_connection = engine.raw_connection()
                             ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 3288, in raw_connection
    return self.pool.connect()
           ^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 452, in connect
    return _ConnectionFairy._checkout(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 1267, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 716, in checkout
    rec = pool._do_get()
          ^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/impl.py", line 169, in _do_get
    with util.safe_reraise():
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/util/langhelpers.py", line 147, in __exit__
    raise exc_value.with_traceback(exc_tb)
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/impl.py", line 167, in _do_get
    return self._create_connection()
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 393, in _create_connection
    return _ConnectionRecord(self)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 678, in __init__
    self.__connect()
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 902, in __connect
    with util.safe_reraise():
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/util/langhelpers.py", line 147, in __exit__
    raise exc_value.with_traceback(exc_tb)
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 898, in __connect
    self.dbapi_connection = connection = pool._invoke_creator(self)
                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/create.py", line 637, in connect
    return dialect.connect(*cargs, **cparams)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/default.py", line 615, in connect
    return self.loaded_dbapi.connect(*cargs, **cparams)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/pymysql/connections.py", line 358, in __init__
    self.connect()
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/pymysql/connections.py", line 711, in connect
    raise exc
sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2003, "Can't connect to MySQL server on 'localhost' ([Errno 111] Connection refused)")
(Background on this error at: https://sqlalche.me/e/20/e3q8)
[2025-10-07 14:36:09,529] ERROR in app: Exception on / [GET]
Traceback (most recent call last):
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/pymysql/connections.py", line 644, in connect
    sock = socket.create_connection(
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/alt/python311/lib64/python3.11/socket.py", line 863, in create_connection
    raise exceptions[0]
  File "/opt/alt/python311/lib64/python3.11/socket.py", line 848, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 145, in __init__
    self._dbapi_connection = engine.raw_connection()
                             ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 3288, in raw_connection
    return self.pool.connect()
           ^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 452, in connect
    return _ConnectionFairy._checkout(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 1267, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 716, in checkout
    rec = pool._do_get()
          ^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/impl.py", line 169, in _do_get
    with util.safe_reraise():
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/util/langhelpers.py", line 147, in __exit__
    raise exc_value.with_traceback(exc_tb)
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/impl.py", line 167, in _do_get
    return self._create_connection()
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 393, in _create_connection
    return _ConnectionRecord(self)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 678, in __init__
    self.__connect()
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 902, in __connect
    with util.safe_reraise():
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/util/langhelpers.py", line 147, in __exit__
    raise exc_value.with_traceback(exc_tb)
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 898, in __connect
    self.dbapi_connection = connection = pool._invoke_creator(self)
                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/create.py", line 637, in connect
    return dialect.connect(*cargs, **cparams)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/default.py", line 615, in connect
    return self.loaded_dbapi.connect(*cargs, **cparams)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/pymysql/connections.py", line 358, in __init__
    self.connect()
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/pymysql/connections.py", line 711, in connect
    raise exc
pymysql.err.OperationalError: (2003, "Can't connect to MySQL server on 'localhost' ([Errno 111] Connection refused)")

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/flask/app.py", line 2190, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/flask/app.py", line 1486, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/flask/app.py", line 1484, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/flask/app.py", line 1469, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/ql.laixeanninh.vn/app.py", line 97, in index
    hoc_vien_list = HocVien.query.order_by(HocVien.id.desc()).limit(5).all()
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/query.py", line 2688, in all
    return self._iter().all()  # type: ignore
           ^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/query.py", line 2842, in _iter
    result: Union[ScalarResult[_T], Result[_T]] = self.session.execute(
                                                  ^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 2262, in execute
    return self._execute_internal(
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 2134, in _execute_internal
    conn = self._connection_for_bind(bind)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 2001, in _connection_for_bind
    return trans._connection_for_bind(engine, execution_options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<string>", line 2, in _connection_for_bind
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/state_changes.py", line 139, in _go
    ret_value = fn(self, *arg, **kw)
                ^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/orm/session.py", line 1126, in _connection_for_bind
    conn = bind.connect()
           ^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 3264, in connect
    return self._connection_cls(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 147, in __init__
    Connection._handle_dbapi_exception_noconnection(
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 2426, in _handle_dbapi_exception_noconnection
    raise sqlalchemy_exception.with_traceback(exc_info[2]) from e
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 145, in __init__
    self._dbapi_connection = engine.raw_connection()
                             ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/base.py", line 3288, in raw_connection
    return self.pool.connect()
           ^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 452, in connect
    return _ConnectionFairy._checkout(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 1267, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 716, in checkout
    rec = pool._do_get()
          ^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/impl.py", line 169, in _do_get
    with util.safe_reraise():
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/util/langhelpers.py", line 147, in __exit__
    raise exc_value.with_traceback(exc_tb)
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/impl.py", line 167, in _do_get
    return self._create_connection()
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 393, in _create_connection
    return _ConnectionRecord(self)
           ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 678, in __init__
    self.__connect()
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 902, in __connect
    with util.safe_reraise():
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/util/langhelpers.py", line 147, in __exit__
    raise exc_value.with_traceback(exc_tb)
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/pool/base.py", line 898, in __connect
    self.dbapi_connection = connection = pool._invoke_creator(self)
                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/create.py", line 637, in connect
    return dialect.connect(*cargs, **cparams)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib64/python3.11/site-packages/sqlalchemy/engine/default.py", line 615, in connect
    return self.loaded_dbapi.connect(*cargs, **cparams)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/pymysql/connections.py", line 358, in __init__
    self.connect()
  File "/home/bhnkcaet/virtualenv/ql.laixeanninh.vn/3.11/lib/python3.11/site-packages/pymysql/connections.py", line 711, in connect
    raise exc
sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2003, "Can't connect to MySQL server on 'localhost' ([Errno 111] Connection refused)")
(Background on this error at: https://sqlalche.me/e/20/e3q8)
[UID:1178][3151141] packetLen < 0