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STNumCurves (geography Data Type)


Applies To: SQL Server 2014, SQL Server 2016 Preview

Returns the number of curves in a one-dimensional geography instance.


SQL Server return type: geography

CLR return type: SqlGeography

One-dimensional spatial data types include LineString, CircularString, and CompoundCurve. An empty one-dimensional geography instance returns 0.

STNumCurves() works only on simple types; it does not work with geography collections like MultiLineString. NULL is returned when the geography instance is not a one-dimensional data type.

Null is returned for uninitialized geography instances.

The following example shows how to get the number of curves in a CircularString instance:

DECLARE @g geography;

SET @g = geography::Parse('CIRCULARSTRING(-122.358 47.653, -122.348 47.649, -122.348 47.658, -122.358 47.658, -122.358 47.653)');

SELECT @g.STNumCurves();

The following example uses STNumCurves() to return the number of curves in a CompoundCurve instance.

DECLARE @g geography;

SET @g = geography::Parse('COMPOUNDCURVE(CIRCULARSTRING(-122.358 47.653, -122.348 47.649, -122.348 47.658, -122.358 47.658, -122.358 47.653))');

SELECT @g.STNumCurves();

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