Lines Matching refs:_backend
166 self._backend = None
258 self._backend.connect(host=self.host, username=self.username,
262 except self._backend.OperationalError:
285 self._backend = self._get_backend(self.db_type)
286 _copy_exceptions(self._backend, self)
291 if self._backend:
292 self._backend.disconnect()
304 results = self._backend.execute(query, parameters)
305 except self._backend.OperationalError:
312 results = self._backend.execute(query, parameters)
314 self.rowcount = self._backend.rowcount
