public void TestSTNRings()
{
using (var db = new PostGisTestDataConnection(TestDatabaseConnectionString))
{
const string Wkt = "POLYGON((1 2, 3 4, 5 6, 1 2))";
db.TestGeometries
.Value(g => g.Id, 1)
.Value(g => g.Geometry, () => GeometryInput.STGeomFromText(Wkt))
.Insert();
db.TestGeometries
.Value(g => g.Id, 2)
.Value(g => g.Geometry, () => null)
.Insert();
Assert.AreEqual(1, db.TestGeometries.Where(g => g.Id == 1).Select(g => g.Geometry.STNRings()).Single());
Assert.AreEqual(0, db.TestGeometries.Where(g => g.Id == 1).Select(g => g.Geometry.STNumInteriorRings()).Single());
Assert.AreEqual(0, db.Select(() => GeometryAccessors.STNumInteriorRings(Wkt)));
// STNumInteriorRing is synonym to STNumInteriorRings. See http://postgis.net/docs/manual-1.5/ST_NumInteriorRing.html
Assert.AreEqual(0, db.TestGeometries.Where(g => g.Id == 1).Select(g => g.Geometry.STNumInteriorRing()).Single());
Assert.IsNull(db.TestGeometries.Where(g => g.Id == 2).Select(g => g.Geometry.STNRings()).Single());
Assert.IsNull(db.Select(() => GeometryAccessors.STNRings((NTSG)null)));
Assert.AreEqual(1, db.Select(() => GeometryAccessors.STNRings(Wkt)));
Assert.AreEqual(0, db.Select(() => GeometryAccessors.STNumInteriorRing(Wkt)));
}
}