code: def connect(self, db_uri, debug=False):
          
          kwargs = {'echo': debug, 'convert_unicode': True}
          # connect to the SQL database
          if 'mysql' in db_uri:
              kwargs['pool_recycle'] = 3600
          elif '://' not in db_uri:
              logger.debug("detected sqlite path URI: {}".format(db_uri))
              db_path = os.path.abspath(os.path.expanduser(db_uri))
              db_uri = "sqlite:///{}".format(db_path)
  
          self.engine = create_engine(db_uri, **kwargs)
          logger.debug('connection established successfully')
          # make sure the same engine is propagated to the BASE classes
          BASE.metadata.bind = self.engine
          # start a session
          self.session = scoped_session(sessionmaker(bind=self.engine))
          # shortcut to query method
          self.query = self.session.query
          return self
docs: Configure connection to a SQL database.
  
          Args:
              db_uri (str): path/URI to the database to connect to
              debug (Optional[bool]): whether to output logging information