public void TestSTIsEmpty()
{
using (var db = new PostGisTestDataConnection(TestDatabaseConnectionString))
{
const string Wkt1 = "GEOMETRYCOLLECTION EMPTY";
db.TestGeometries.Value(g => g.Id, 1).Value(g => g.Geometry, () => GeometryInput.STGeomFromText(Wkt1)).Insert();
const string Wkt2 = "POLYGON((1 2, 3 4, 5 6, 1 2))";
db.TestGeometries.Value(g => g.Id, 2).Value(g => g.Geometry, () => GeometryInput.STGeomFromText(Wkt2)).Insert();
db.TestGeometries.Value(g => g.Id, 3).Value(g => g.Geometry, () => null).Insert();
Assert.IsTrue(db.TestGeometries.Where(g => g.Id == 1).Select(g => g.Geometry.STIsEmpty()).Single());
Assert.IsFalse(db.TestGeometries.Where(g => g.Id == 2).Select(g => g.Geometry.STIsEmpty()).Single());
Assert.IsNull(db.TestGeometries.Where(g => g.Id == 3).Select(g => g.Geometry.STIsEmpty()).Single());
// TODO: Need some research for reason of error:
// function st_isempty(unknown) is not unique. Could not choose a best candidate function. You might need to add explicit type casts.
var version = new Version(db.Select(() => VersionFunctions.PostGISLibVersion()));
if (version > new Version("3.0.0"))
{
Assert.IsNull(db.Select(() => GeometryAccessors.STIsEmpty((NTSG)null)));
Assert.IsTrue(db.Select(() => GeometryAccessors.STIsEmpty("CIRCULARSTRING EMPTY")));
Assert.IsFalse(db.Select(() => GeometryAccessors.STIsEmpty("POINT(0 0)")));
}
}
}