STIsRing (geometry Data Type)


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().

Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.
.STIsRing ( )  

SQL Server return type: bit

CLR return type: SqlBoolean

This method returns null if the instance is not a LineString.

The following example creates a LineString instance and uses 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();  

STIsClosed (geometry Data Type)
STGeometryType (geometry Data Type)
STIsSimple (geometry Data Type)
OGC Methods on Geometry Instances

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