Function PQclear

src/interfaces/libpq/fe-exec.c:717–776

* PQclear - * free's the memory associated with a PGresult */

 *	  free's the memory associated with a PGresult
 */
void
PQclear(PGresult *res)
{
	PGresult_data *block;
	int			i;

	if (!res)
		return;

	for (i = 0; i < res->nEvents; i++)
	{
		/* only send DESTROY to successfully-initialized event procs */
		if (res->events[i].resultInitialized)
		{
			PGEventResultDestroy evt;

			evt.result = res;
			(void) res->events[i].proc(PGEVT_RESULTDESTROY, &evt,
									   res->events[i].passThrough);
		}
		free(res->events[i].name);
	}

	if (res->events)
		free(res->events);

	/* Free all the subsidiary blocks */
	while ((block = res->curBlock) != NULL)
	{
		res->curBlock = block->next;
		free(block);
	}

	/* Free the top-level tuple pointer array */
	if (res->tuples)
		free(res->tuples);

	/* zero out the pointer fields to catch programming errors */
	res->attDescs = NULL;
	res->tuples = NULL;
	res->paramDescs = NULL;
	res->errFields = NULL;
	res->events = NULL;
	res->nEvents = 0;
	/* res->curBlock was zeroed out earlier */

	if (res->extras)
		free(res->extras);
	res->extraslen = 0;
	res->extras = NULL;
	res->extraType = PGExtraTypeNone;

	if (res->waitGxids)
		free(res->waitGxids);
	res->waitGxids = NULL;
	res->nWaits = 0;

	/* Free the PGresult structure itself */