[postgis-users] RE: Trigger updata lines

[Obe, Regina]

Couple of things.  One you are using GeometryFromText incorrectly and 2
your code is just wrong.  Not just missing froms.  I think below should
work although I haven't tested it.
 
Try instead
 
CREATE OR REPLACE FUNCTION update_links() RETURNS "trigger"
    AS 
$BODY$
BEGIN
    UPDATE links SET the_geom = MakeLine(NEW.the_geom,ends.the_geom) 
        FROM nodes As ends
        WHERE NEW.name = links.from_node and ends.name = links.to_node;
 
    UPDATE links SET the_geom = MakeLine(starts.the_geom,NEW.the_geom) 
        FROM nodes As starts
        WHERE starts.name = links.from_node and NEW.name =
links.to_node;
 
RETURN NEW;
END
$BODY$
    LANGUAGE plpgsql;
CREATE TRIGGER update_links_update
  AFTER UPDATE
  ON nodes
  FOR EACH ROW
  EXECUTE PROCEDURE update_links();

________________________________

From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
Broun Uganda
Sent: Wednesday, August 15, 2007 5:28 AM
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] RE: Trigger updata lines



Sorry the error i get is:
 

Query failed: ERROR:  missing FROM-clause entry for table "nodes" ....

Broun Uganda





________________________________

	From: tekuganda at hotmail.com
	To: postgis-users at postgis.refractions.net
	Subject: Trigger updata lines
	Date: Tue, 14 Aug 2007 23:24:44 +0300
	
	

	I want to create a trigger that updates lines' geometry
depending on the position of 2 points (from_node & to_node). If i move
a point connecting two or more lines, the ends of lines should also move
and follow the point. I wrote the following trigger but it gives me
error that am giving multiple geometry.
	 
	CREATE OR REPLACE FUNCTION update_links() RETURNS "trigger"
	    AS 
	'
	DECLARE
	starts character varying;
	ends character varying;
	BEGIN
	starts = NEW.name WHERE nodes.name = links.from_node;
	ends = NEW.name WHERE nodes.name = links.to_node;
	UPDATE links SET the_geom =
GeometryFromtext(starts.the_geom,ends.the_geom) ;
	RETURN NEW;
	END'
	    LANGUAGE plpgsql;
	CREATE TRIGGER update_links_update
	  AFTER UPDATE
	  ON nodes
	  FOR EACH ROW
	  EXECUTE PROCEDURE update_links();
	 
	 
	Thanks for your help
	
	
	
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