stisvalid-geometry-data-type.md

title	description	author	ms.author	ms.date	ms.service	ms.subservice	ms.topic	f1_keywords	helpviewer_keywords	dev_langs	monikerRange
STIsValid (geometry Data Type)	STIsValid (geometry Data Type)	MladjoA	mlandzic	08/03/2017	sql	t-sql	reference	STIsValid (geometry Data Type) STIsValid_TSQL	STIsValid (geometry Data Type)	TSQL	=azuresqldb-current||>=sql-server-2016||>=sql-server-linux-2017||=azuresqldb-mi-current

STIsValid (geometry Data Type)

[!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance]

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

[!INCLUDEssNoVersion] return type: bit

CLR return type: SqlBoolean

Remarks

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

[!INCLUDEssNoVersion] 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