STIsValid (geometry Data Type)

**APPLIES TO:** SQL Server (starting with 2008) Azure SQL Database Azure SQL Data Warehouse Parallel Data Warehouse

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.

Syntax

  
.STIsValid ( )  

Return Types

SQL Server return type: bit

CLR return type: SqlBoolean

Remarks

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.

Examples

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();  

See Also

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