Query the database file.

def Query(self, sql_query):
    """Query the database file."""
    results = {}

    try:
      self._connection = sqlite.connect(self.name)
      self._connection.execute("PRAGMA journal_mode=%s" % self.journal_mode)
      self._cursor = self._connection.cursor()
      results = self._cursor.execute(sql_query).fetchall()

    except sqlite.Error as error_string:
      logging.warning("SQLite error %s", error_string)

    return results