class_docstr: Base connector class to be extended by all connectors.
docstr: make connection to database
code: def _init_connection(self, config: BaseConnectorConfig):
      """
      make connection to database
      """
      pass
  
imports: from abc import ABC, abstractmethod
  import os
  from ..helpers.df_info import DataFrameType
  from ..helpers.logger import Logger
  from pydantic import BaseModel
  from typing import Optional, Union
label_desc: Use image node_id 4 for calling the BaseConnector obj's underlying member method code with example usage: obj._init_connection(config) without return types