Function PQgetisnull

src/interfaces/libpq/fe-exec.c:3705–3714

PQgetisnull: * returns the null status of a field value. */

 *	returns the null status of a field value.
 */
int
PQgetisnull(const PGresult *res, int tup_num, int field_num)
{
	if (!check_tuple_field_number(res, tup_num, field_num))
		return 1;				/* pretend it is null */
	if (res->tuples[tup_num][field_num].len == NULL_LEN)
		return 1;
	else
		return 0;
}

/* PQnparams:
 *	returns the number of input parameters of a prepared statement.