Spliting SDO_JOIN in two ref cursors

Question

Hi,
What is the best/most efficient way to return two ref cursor using a SDO_JOIN?
In other words, from this example taken from the Oracle Spatial User Guide
SELECT a.gid, b.gid FROM parks a, highways b,
TABLE(SDO_JOIN('PARKS', 'SHAPE', 'HIGHWAYS', 'SHAPE',
'mask=ANYINTERACT')) c
WHERE c.rowid1 = a.rowid AND c.rowid2 = b.rowid;
I would like to have a procedure that split the result of the above Select in two ref cursors. Something like this:
PROCEDURE "GET_PARKS_HIGHWAYS"
"P_PARKS" OUT SYS_REFCURSOR,
"P_HIGHWAYS" OUT SYS_REFCURSOR
as
BEGIN
/* Here I want every Parks that interact a highway
OPEN P_PARKS FOR
SELECT * FROM PARKS WHERE ....
/* Here I want every highway that interact a park
OPEN P_HIGHWAYS FOR
SELECT * FROM HIGHWAYS WHERE ....
END
Can I do this with a single SDO_JOIN or do I have to put one in the where clause of each select?
Hope that somebody understand! If not, let me know, I will try to be clearer.
Thanks
Frederic Goulet

Answer 1

Hi Frederic,
You will get the complete set of answers for both questions when using the anyinteract mask, i.e. you will have in your result set:
All of the parks that interact with highways, and all of the highways that interact with parks.
If you want, you can order by a.gid, and for each park you would see all of the highways.
If you order by b.gid, for each highway you would see all the parks.
The result set is complete in both cases.
Hope this helps.