Function PQexecFinish

src/interfaces/libpq/fe-exec.c:2378–2409

* Common code for PQexec and sibling routines: wait for command result */

 * Common code for PQexec and sibling routines: wait for command result
 */
static PGresult *
PQexecFinish(PGconn *conn)
{
	PGresult   *result;
	PGresult   *lastResult;

	/*
	 * For backwards compatibility, return the last result if there are more
	 * than one.  (We used to have logic here to concatenate successive error
	 * messages, but now that happens automatically, since conn->errorMessage
	 * will continue to accumulate errors throughout this loop.)
	 *
	 * We have to stop if we see copy in/out/both, however. We will resume
	 * parsing after application performs the data transfer.
	 *
	 * Also stop if the connection is lost (else we'll loop infinitely).
	 */
	lastResult = NULL;
	while ((result = PQgetResult(conn)) != NULL)
	{
		if (lastResult)
			PQclear(lastResult);
		lastResult = result;
		if (result->resultStatus == PGRES_COPY_IN ||
			result->resultStatus == PGRES_COPY_OUT ||
			result->resultStatus == PGRES_COPY_BOTH ||
			conn->status == CONNECTION_BAD)
			break;
	}

	return lastResult;
}

/*
 * PQdescribePrepared