<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _has_ngrams(self, text_id, size):
 """Returns True if a text has existing records for n-grams of size `size`. :param text_id: database ID of text to check :type text_id: `int` :param size: size of n-grams :type size: `int` :rtype: `bool` """

        if self._conn.execute(constants.SELECT_HAS_NGRAMS_SQL,
                              [text_id, size]).fetchone() is None:
            return False
        return True