STIsClosed (geometry Data Type)
Applies To: SQL Server 2014, SQL Server 2016 Preview
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.
Applies to: SQL Server (SQL Server 2008 through current version), Azure SQL Database.
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.
DECLARE @g geometry; SET @g = geometry::STGeomFromText('LINESTRING(0 0, 2 2, 1 0)', 0); SELECT @g.STIsClosed();