STIsRing (geometry)#
Returns 1 if a geometry instance fulfills the following requirements:
It is a LineString instance.
It is closed.
It is simple.
Returns 0 if the LineString instance does not meet the requirements. For a geometry instance to be closed and simple, both STIsClosed() and STIsSimple() must return 1 when invoked on the instance. To determine the instance type of a geometry, use STGeometryType().
Syntax#
.STIsRing ()
Return type#
bit
Remarks#
This method returns null if the instance is not a LineString.
Example#
Create a LineString instance and use STIsRing() to test whether the instance is a ring.
DECLARE @g geometry;
SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 1 0, 0 0)', 0);
SELECT @g.STIsRing();