class_docstr: Database connection protocol.
class_docstr_tok: ["Database","connection","protocol","."]
docstr: Connect to a database.
  
  :param host: The database host to connect to.
  :param port: The database port to connect to.
  :param username: The database username used for the authentication.
  :param schema: The database schema to connect to.
  :return: the authorized connection object.
docstr_tok: ["Connect","to","a","database",".",":","param","host",":","The","database","host","to","connect","to",".",":","param","port",":","The","database","port","to","connect","to",".",":","param","username",":","The","database","username","used","for","the","authentication",".",":","param","schema",":","The","database","schema","to","connect","to",".",":","return",":","the","authorized","connection","object","."]
code: def connect(
      self, host: str, port: int, username: str, schema: str
  ) -> Any:
      """
      Connect to a database.
  
      :param host: The database host to connect to.
      :param port: The database port to connect to.
      :param username: The database username used for the authentication.
      :param schema: The database schema to connect to.
      :return: the authorized connection object.
      """
  
imports: from __future__ import annotations
  import contextlib
  import warnings
  from contextlib import closing
  from datetime import datetime
  from typing import TYPE_CHECKING, Any, Callable, Generator, Iterable, List, Mapping, Protocol, Sequence, TypeVar, cast, overload
  from urllib.parse import urlparse
  import sqlparse
  from sqlalchemy import create_engine
  from airflow.exceptions import AirflowException, AirflowProviderDeprecationWarning
  from airflow.hooks.base import BaseHook
label_desc: Use image node_id 1 for calling the ConnectorProtocol obj's underlying member method code with example usage: obj.connect(host, port, username, schema) without return types