Track a Line String with a Trigger

Hi,
(sorry for my bad english)
I need to know if i can track a Line String with a trigger. For example, in my case, i've to colums called "COORDINATEPARTENZA" and "COORDINATEARRIVO". From contains a CONTROID() coordinates, anche TO contains CENTROID() coordinates. Now, can i track a line in a colums "LINE" with a trigger? All in automatic?
There is a method to take the coordinates from "COORDINATEPARTENZA" and "COORDINATEARRIVO" and track an automatic stringline with a trigger?
This is the code:
This is the Trigger:
CREATE OR REPLACE TRIGGER "TRIGGERPERCORSO"
BEFORE INSERT OR UPDATE OF luo_nomeluogo ON "SPOSTAMENTI"
FOR EACH ROW
DECLARE
partenza VISUALPERCORSO.coordinatepartenza%TYPE;
arrivo VISUALPERCORSO.coordinatearrivo%TYPE;
vecchioluogo LUOGHI.nomeluogo%TYPE;
nuovocodicespostamento SPOSTAMENTI.codicespostamento%TYPE;
presenza NUMERIC;
BEGIN
SELECT COUNT(*) INTO presenza
FROM spostamenti
WHERE ope_codiceopera = :new.ope_codiceopera;
IF (presenza >= 1) then
SELECT luo_nomeluogo INTO vecchioluogo
FROM (SELECT * FROM spostamenti
WHERE ope_codiceopera = :new.ope_codiceopera
ORDER BY codicespostamento DESC)
WHERE ROWNUM <2;
SELECT SDO_GEOM.SDO_CENTROID (c.COLLOCAZIONE, m.diminfo) INTO partenza
FROM LUOGHI c, user_sdo_geom_metadata m
WHERE m.table_name = 'LUOGHI' AND m.column_name = 'COLLOCAZIONE' AND c.nomeluogo = vecchioluogo;
SELECT SDO_GEOM.SDO_CENTROID (d.COLLOCAZIONE, n.diminfo) INTO arrivo
FROM LUOGHI d, user_sdo_geom_metadata n
WHERE n.table_name = 'LUOGHI' AND n.column_name = 'COLLOCAZIONE' AND d.nomeluogo = :new.luo_nomeluogo;
INSERT INTO VISUALPERCORSO(LUOGOPARTENZA, OPE_CODICEOPERA, COORDINATEPARTENZA, LUOGOARRIVO, COORDINATEARRIVO) VALUES (vecchioluogo, :new.ope_codiceopera, partenza, :new.luo_nomeluogo, arrivo);
END IF;
END;
So, now i need to track a line (with oracle spatial) from "COORDINATEPARTENZA" to "COORDINATE ARRIVO". With another trigger.
Thanks a lot (sorry for my bad english).

"COORDINATEPARTENZA" and "COORDINATEARRIVO" are points, correct?
If I understand, you need to create a line from initial point (PARTENZA) to final point (ARRIVO) in a trigger.
Yes, you can do it.
Anyway, you can write to me in italian (miguel dot fornari at gmail).

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Track a StringLine with a Trigger

Hi,
(sorry for my bad english)
I need to know if i can track a stringline with a trigger. For example, in my case, i've to colums called "From" and "To". From contains a CONTROID() coordinates, anche TO contains CENTROID() coordinates. Now, can i track a line in a colums "LINE" with a trigger? All in automatic?
There is a method to take the coordinates from "FROM" and "TO" and track an automatic stringline with a trigger?
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ID | FROM | TO | LINE
Thanks a lot (sorry for my bad english).

Ok, i means a simple line (Line Sting http://www.oracle.com/pls/db111/to_URL?remark=ranked&urlname=http:%2F%2Fdownload.oracle.com%2Fdocs%2Fcd%2FB28359_01%2Fappdev.111%2Fb28400%2Fglossary.htm%23sthref2928)
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BEFORE INSERT OR UPDATE OF luo_nomeluogo ON "SPOSTAMENTI"
FOR EACH ROW
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partenza VISUALPERCORSO.coordinatepartenza%TYPE;
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FROM LUOGHI c, user_sdo_geom_metadata m
WHERE m.table_name = 'LUOGHI' AND m.column_name = 'COLLOCAZIONE' AND c.nomeluogo = vecchioluogo;
SELECT SDO_GEOM.SDO_CENTROID (d.COLLOCAZIONE, n.diminfo) INTO arrivo
FROM LUOGHI d, user_sdo_geom_metadata n
WHERE n.table_name = 'LUOGHI' AND n.column_name = 'COLLOCAZIONE' AND d.nomeluogo = :new.luo_nomeluogo;
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END IF;
END;
So, now i need to track a line (with oracle spatial) from "COORDINATEPARTENZA" to "COORDINATE ARRIVO". With another trigger.
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table string.string is mutating, trigger/function may not see it
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Action: Rewrite the trigger (or function) so it does not read that table.
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