pggeodb.nancy.inra.fr/db_cefs - db_cefs on pggeodb.nancy.inra.fr

Function: relationtrigger

Schema

topology

Owner

postgres

Descriptions

There is no description for function relationtrigger

Options

Definition

CREATE OR REPLACE FUNCTION topology.relationtrigger (
)
RETURNS trigger AS
$span$
DECLARE
 toponame varchar;
 topoid integer;
 plyr RECORD; -- parent layer
 rec RECORD;
 ok BOOL;

BEGIN
 IF TG_NARGS != 2 THEN
   RAISE EXCEPTION 'RelationTrigger called with wrong number of arguments';
 END IF;

 topoid = TG_ARGV[0];
 toponame = TG_ARGV[1];

 --RAISE NOTICE 'RelationTrigger called % % on %.relation for a %', TG_WHEN, TG_OP, toponame, TG_LEVEL;


 IF TG_OP = 'DELETE' THEN
   RAISE EXCEPTION 'RelationTrigger not meant to be called on DELETE';
 END IF;

 -- Get layer info (and verify it exists)
 ok = false;
 FOR plyr IN EXECUTE 'SELECT * FROM topology.layer '
      'WHERE '
      ' topology_id = ' || topoid
   || ' AND'
      ' layer_id = ' || NEW.layer_id
 LOOP
   ok = true;
   EXIT;
 END LOOP;
 IF NOT ok THEN
   RAISE EXCEPTION 'Layer % does not exist in topology %',
     NEW.layer_id, topoid;
   RETURN NULL;
 END IF;

 IF plyr.level > 0 THEN -- this is hierarchical layer

   -- ElementType must be the layer child id
   IF NEW.element_type != plyr.child_id THEN
     RAISE EXCEPTION 'Type of elements in layer % must be set to its child layer id %', plyr.layer_id, plyr.child_id;
     RETURN NULL;
   END IF;

   -- ElementId must be an existent TopoGeometry in child layer
   ok = false;
   FOR rec IN EXECUTE 'SELECT topogeo_id FROM '
     || quote_ident(toponame) || '.relation '
        ' WHERE layer_id = ' || plyr.child_id
     || ' AND topogeo_id = ' || NEW.element_id
   LOOP
     ok = true;
     EXIT;
   END LOOP;
   IF NOT ok THEN
     RAISE EXCEPTION 'TopoGeometry % does not exist in the child layer %', NEW.element_id, plyr.child_id;
     RETURN NULL;
   END IF;

 ELSE -- this is a basic layer

   -- ElementType must be compatible with layer type
   IF plyr.feature_type != 4
     AND plyr.feature_type != NEW.element_type
   THEN
     RAISE EXCEPTION 'Element of type % is not compatible with layer of type %', NEW.element_type, plyr.feature_type;
     RETURN NULL;
   END IF;

   --
   -- Now lets see if the element is consistent, which
   -- is it exists in the topology tables.
   --

   --
   -- Element is a Node
   --
   IF NEW.element_type = 1
   THEN
     ok = false;
     FOR rec IN EXECUTE 'SELECT node_id FROM '
       || quote_ident(toponame) || '.node '
          ' WHERE node_id = ' || NEW.element_id
     LOOP
       ok = true;
       EXIT;
     END LOOP;
     IF NOT ok THEN
       RAISE EXCEPTION 'Node % does not exist in topology %', NEW.element_id, toponame;
       RETURN NULL;
     END IF;

   --
   -- Element is an Edge
   --
   ELSIF NEW.element_type = 2
   THEN
     ok = false;
     FOR rec IN EXECUTE 'SELECT edge_id FROM '
       || quote_ident(toponame) || '.edge_data '
          ' WHERE edge_id = ' || abs(NEW.element_id)
     LOOP
       ok = true;
       EXIT;
     END LOOP;
     IF NOT ok THEN
       RAISE EXCEPTION 'Edge % does not exist in topology %', NEW.element_id, toponame;
       RETURN NULL;
     END IF;

   --
   -- Element is a Face
   --
   ELSIF NEW.element_type = 3
   THEN
     IF NEW.element_id = 0 THEN
       RAISE EXCEPTION 'Face % cannot be associated with any feature', NEW.element_id;
       RETURN NULL;
     END IF;
     ok = false;
     FOR rec IN EXECUTE 'SELECT face_id FROM '
       || quote_ident(toponame) || '.face '
          ' WHERE face_id = ' || NEW.element_id
     LOOP
       ok = true;
       EXIT;
     END LOOP;
     IF NOT ok THEN
       RAISE EXCEPTION 'Face % does not exist in topology %', NEW.element_id, toponame;
       RETURN NULL;
     END IF;
   END IF;

 END IF;
 
 RETURN NEW;
END;
$span$
LANGUAGE 'plpgsql'
VOLATILE
RETURNS NULL ON NULL INPUT
SECURITY INVOKER
COST 100;

This file was generated with SQL Manager for PostgreSQL (www.pgsqlmanager.com) at 13/03/2014 13:23