STIsValid (geometry Data Type)


Returns true if a geometry instance is well-formed, based on its Open Geospatial Consortium (OGC) type. Returns false if a geometry instance is not well-formed.

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

SQL Server return type: bit

CLR return type: SqlBoolean

The OGC type of a geometry instance can be determined by invoking STGeometryType().

SQL Server produces only valid geometry instances, but allows for the storage and retrieval of invalid instances. A valid instance representing the same point set of any invalid instance can be retrieved using the MakeValid() method.

The following example creates a geometry instance and uses STIsValid() to test if the instance is valid.

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

STGeometryType (geometry Data Type)
MakeValid (geometry Data Type)
OGC Methods on Geometry Instances

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