code: def execute(self, query, vars=None, result=False):
          
          with self.connection() as cur:
              if self.debug:
                  print(cur.mogrify(query, vars))
  
              resp = cur.execute(query, vars)
  
              if result == False:
                  return resp
  
              else:
                  columns = [i[0] for i in cur.description]
                  results = cur.fetchall()
                  return QueryResult(columns, results)
docs: .. :py:method::
  
          :param bool result: whether query return result
          :rtype: bool
  
          .. note::
              True for `select`, False for `insert` and `update`