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InteriorRingN

Sintassi

InteriorRingN(poligono, N)

Spiegazione

Restituisce l'Nesimo anello interno del poligono come LineString. Gli anelli sono numerati a partire da 1.

Esempi

MariaDB [(none)]> SET @poly = 
    -> 'Polygon((0 0,0 3,3 3,3 0,0 0),(1 1,1 2,2 2,2 1,1 1))';
MariaDB [(none)]> SELECT AsText(InteriorRingN(GeomFromText(@poly),1));
+----------------------------------------------+
| AsText(InteriorRingN(GeomFromText(@poly),1)) |
+----------------------------------------------+
| LINESTRING(1 1,1 2,2 2,2 1,1 1)              |
+----------------------------------------------+
1 row in set (0.00 sec)

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