❇ set parameter tolerance

sql/network/create_table.sql

@@ -3,7 +3,7 @@
 
 set search_path to :schemaname, public;
 
--->> DEFINITION DE LA TOLERANCE TOPOLOGIQUE
+-->> DEFINITION DE LA TOLERANCE TOPOLOGIQUE PAR DEFAUT
 CREATE TABLE IF NOT EXISTS config.tolerance (
 	type varchar(15) PRIMARY KEY,
 	distance float
@@ -14,9 +14,11 @@ INSERT INTO config.tolerance VALUES('topo', 0.01)
 INSERT INTO config.tolerance VALUES('spike', 0.05)
 	ON CONFLICT DO NOTHING;
 
+--LA TOLERANCE TOPO peut également être forcée en paramètre : SET configtolerance.topo TO 0.04;
 CREATE OR REPLACE FUNCTION config.get_tolerance(i_type varchar(15))
-  RETURNS double precision AS
-  $$SELECT distance FROM config.tolerance WHERE type = i_type
+  RETURNS double precision AS $$
+	SELECT coalesce(nullif(current_setting('configtolerance.'||i_type, true),'')::float, distance)
+	FROM config.tolerance WHERE type = i_type
   $$ LANGUAGE sql IMMUTABLE;
 
 CREATE TABLE IF NOT EXISTS pipe_default_node (