找出空间数据库中两点之间是否有路线

Question

I am beginner in the matter of spatial databases I am using MS SQL Server 2014 with database structure as follows:

Point {
  id int AI,
  point geometry,
  name text
}
Path{
  id int AI,
  path geometry,
}

column point is created as (x,y) and path as set of start point and end point as linestring (xy, xy)

I would like to check if there is connection through many paths from one point to another. Is there anyway to check it in SQL ? I can believe that I can do it at the server side or manually check all connections from first point etc. and in the end I will knew each combination (but I want to knew boolean value yes or no or the number of possible paths).

I can't find any good article nor book about spatial database and looking for a path function...

Answer 1

Use the Geospatial STIntersects method. Look at MSDN article here

DECLARE @g geometry;
DECLARE @h geometry;
SET @g = geometry::STGeomFromText('LINESTRING(0 2, 2 0, 4 2)', 0);
SET @h = geometry::STGeomFromText('POINT(1 1)', 0);
SELECT @g.STIntersects(@h);

to use in a select statement:

Select geometryColumn.STIntersects(@g)
from Test

Answer 2

Sarin's answer is right but still not complete.

The following query pick point id 1 and checks if is intersect with any path:

SELECT Path.path.STIntersects(Point.point)
FROM Point CROSS JOIN dbo.Path
WHERE Point.id=1

I've tested the query with the same values as the ones from sarin's answer:

INSERT INTO Path (path)
VALUES (geometry::STGeomFromText('LINESTRING(0 2, 2 0, 4 2)', 0)),
       (geometry::STGeomFromText('LINESTRING(0 0, 2 2, 4 4)', 0))
GO
INSERT INTO Point (point, name)
VALUES (geometry::STGeomFromText('POINT(1 1)', 0), 'myPoint');

So the first path returns 0 (does not intersect with 1,1) and the second one returns 1.