code: def Close(self):
      
      self.schema = {}
  
      if self._is_open:
        self._database.close()
      self._database = None
  
      if os.path.exists(self._temp_db_file_path):
        try:
          os.remove(self._temp_db_file_path)
        except (OSError, IOError) as exception:
          logger.warning((
              'Unable to remove temporary copy: {0:s} of SQLite database: '
              '{1:s} with error: {2!s}').format(
                  self._temp_db_file_path, self._filename, exception))
  
      self._temp_db_file_path = ''
  
      if os.path.exists(self._temp_wal_file_path):
        try:
          os.remove(self._temp_wal_file_path)
        except (OSError, IOError) as exception:
          logger.warning((
              'Unable to remove temporary copy: {0:s} of SQLite database: '
              '{1:s} with error: {2!s}').format(
                  self._temp_wal_file_path, self._filename, exception))
  
      self._temp_wal_file_path = ''
  
      self._is_open = False
docs: Closes the database connection and cleans up the temporary file.