def _have_cancel_key(self):
if self._cancel != ffi.NULL:
tmp, self._cancel = self._cancel, ffi.NULL
libpq.PQfreeCancel(tmp)
self._cancel = libpq.PQgetCancel(self._pgconn)
if self._cancel == ffi.NULL:
raise exceptions.OperationalError("can't get cancellation key")
def _close(self):
if self._closed == 1:
return
if self._cancel:
libpq.PQfreeCancel(self._cancel)
self._cancel = ffi.NULL
if self._pgconn:
libpq.PQfinish(self._pgconn)
self._pgconn = None
self._closed = 1