STNumPoints (geography Data Type)
Applies to:
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Returns the total number of points in each of the figures in a geography instance.
Syntax
.STNumPoints ( )
Note
To view Transact-SQL syntax for SQL Server 2014 (12.x) and earlier versions, see Previous versions documentation.
Return Types
SQL Server return type: int
CLR return type: SqlInt32
Remarks
This method counts the points in the description of a geography instance. Duplicate points are counted; however, connecting points between segments are counted only once. If this instance is a collection, this method returns the total number of points in the collection.
Examples
A. Retrieving the total number of points in a LineString
The following example creates a LineString
instance and uses STNumPoints()
to determine how many points were used in the description of the instance.
DECLARE @g geography;
SET @g = geography::STGeomFromText('LINESTRING(-122.360 47.656, -122.343 47.656)', 4326);
SELECT @g.STNumPoints();
B. Retrieving the total number of points in a GeometryCollection
The following example returns a sum of the points for all elements in the GeometryCollection
.
DECLARE @g geography = 'GEOMETRYCOLLECTION(CIRCULARSTRING(-122.358 47.653, -122.348 47.649, -122.348 47.658, -122.358 47.658, -122.358 47.653)
,CURVEPOLYGON(CIRCULARSTRING(-122.358 47.653, -122.348 47.649, -122.348 47.658, -122.358 47.658, -122.358 47.653)))';
SELECT @g.STNumPoints();
C. Returning the number of points in a CompoundCurve
The following example returns the number of points in a CompoundCurve instance. The query returns 5 instead of 6 because STNumPoints() only counts the connecting point between the segments once.
DECLARE @g geography = 'COMPOUNDCURVE(CIRCULARSTRING(-122.358 47.653, -122.348 47.649, -122.348 47.658),( -122.348 47.658, -121.56 48.12, -122.358 47.653))'
SELECT @g.STNumPoints();
See Also
Phản hồi
https://aka.ms/ContentUserFeedback.
Sắp ra mắt: Trong năm 2024, chúng tôi sẽ dần gỡ bỏ Sự cố với GitHub dưới dạng cơ chế phản hồi cho nội dung và thay thế bằng hệ thống phản hồi mới. Để biết thêm thông tin, hãy xem:Gửi và xem ý kiến phản hồi dành cho