Least Cost Routing in SQL 2008

Question

Anybody tried stuff like least cost routing in sql 2008? I have a small road network represented by linestrings in sql, and I'd like to find the shortest (or any other) route between two points. Anyone have some links to whitepapers... tutorials maybe?

Answer 1

I would like to perform routing in MS SQL 2012 which is going to be similar like pg routing ?
Actually in pgrouting I'll do the following steps to create a routable network.
1)
create a database routing with template "template_routing"
2)
create table "road_network" with following constraints
CHECK (st_ndims(the_geom) = 2)
CHECK (geometrytype(the_geom) = 'MULTILINESTRING'::text OR the_geom IS NULL)
CHECK (st_srid(the_geom) = 4030)
Then
-- @ CREATE INDEX FOR THE ROAD TABLE -------------------- IMPORTANT
CREATE INDEX spatialindex_road
 ON road_network
 USING gist
 (the_geom);
3)
Perform following queries
ALTER TABLE road_network ADD COLUMN "source" integer;
ALTER TABLE road_network ADD COLUMN "target" integer;
SELECT assign_vertex_id('road_network', 0.00001, 'the_geom', 'gid');
CREATE INDEX source_idx ON road_network("source");
CREATE INDEX target_idx ON road_network("target");
ALTER TABLE road_network  ADD COLUMN length double precision;
UPDATE road_network  SET length = length(the_geom);
ALTER TABLE road_network  ADD COLUMN reverse_cost double precision;
UPDATE road_network  SET reverse_cost = length;
ALTER TABLE road_network  ADD COLUMN x1 double precision;
ALTER TABLE road_network  ADD COLUMN y1 double precision;
ALTER TABLE road_network  ADD COLUMN x2 double precision;
ALTER TABLE road_network  ADD COLUMN y2 double precision;
UPDATE road_network  SET x1 = x(ST_PointN(the_geom, 1));
UPDATE road_network  SET y1 = y(ST_PointN(the_geom, 1));
UPDATE road_network  SET x2 = x(ST_PointN(the_geom, ST_NumPoints(the_geom)));
UPDATE road_network  SET y2 = y(ST_PointN(the_geom, ST_NumPoints(the_geom)));
alter table road_network add column cost double precision default 0;
update road_network set cost=0.1 where type='NH';
update road_network set cost=0.2 where type='SH';
update road_network set cost=0.3 where type='major';
update road_network set cost=0.4 where type='minor';
update road_network set cost=1.2 where type='colony';
update road_network set cost=0.8 where type='third';
4)
Now network table created
To check 
Run: 
run this query on ur postgreSQL....
assign table name name and create a table
CREATE TABLE shortest_path_astar_table_3(gid int4) with oids;
SELECT AddGeometryColumn( 'shortest_path_astar_table_3', 'the_geom', 4030, 'MULTILINESTRING', 2 );
INSERT INTO shortest_path_astar_table_3(the_geom) 
SELECT the_geom FROM astar_sp_directed('road_network',37,43,true,true);
Open "shortest_path_astar_table_3" on QGIS and check the path
Is there any similar way to perform similar queries in SQL ?