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geometry (Transact-SQL)
geometry Data Type Method Reference
OGC Methods on Geometry Instances
STArea (geometry Data Type)
STAsBinary (geometry Data Type)
STAsText (geometry Data Type)
STBoundary (geometry Data Type)
STBuffer (geometry Data Type)
STCentroid (geometry Data Type)
STContains (geometry Data Type)
STConvexHull (geometry Data Type)
STCrosses (geometry Data Type)
STCurveN (geometry Data Type)
STCurveToLine (geometry Data Type)
STDifference (geometry Data Type)
STDimension (geometry Data Type)
STDisjoint (geometry Data Type)
STDistance (geometry Data Type)
STEndpoint (geometry Data Type)
STEnvelope (geometry Data Type)
STEquals (geometry Data Type)
STExteriorRing (geometry Data Type)
STGeometryN (geometry Data Type)
STGeometryType (geometry Data Type)
STInteriorRingN (geometry Data Type)
STIntersection (geometry Data Type)
STIntersects (geometry Data Type)
STIsClosed (geometry Data Type)
STIsEmpty (geometry Data Type)
STIsRing (geometry Data Type)
STIsSimple (geometry Data Type)
STIsValid (geometry Data Type)
STLength (geometry Data Type)
STNumCurves (geometry Data Type)
STNumGeometries (geometry Data Type)
STNumInteriorRing (geometry Data Type)
STNumPoints (geometry Data Type)
STOverlaps (geometry Data Type)
STPointN (geometry Data Type)
STPointOnSurface (geometry Data Type)
STRelate (geometry Data Type)
STSrid (geometry Data Type)
STStartPoint (geometry Data Type)
STSymDifference (geometry Data Type)
STTouches (geometry Data Type)
STUnion (geometry Data Type)
STWithin (geometry Data Type)
STX (geometry Data Type)
STY (geometry Data Type)
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STIsClosed (geometry Data Type)

SQL Server 2012

Returns 1 if the start and end points of the given geometry instance are the same. Returns 1 for geometry collection types if each contained geometry instance is closed. Returns 0 if the instance is not closed.

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.STIsClosed ( )

SQL Server return type: bit

CLR return type: SqlBoolean

This method returns 0 if any figures of a geometry instance are points, or if the instance is empty.

All Polygon instances are considered closed.

The following example creates a LineString instance and uses STIsClosed() to test if the LineString is closed.

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DECLARE @g geometry;
SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 1 0)', 0);
SELECT @g.STIsClosed();
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