CLOB as Storage for Ordinates?

Question

Hi,
I have a table that has a column called COORDS it is a CLOB type.
I want to make a query that uses these coordinates (example value -123,49,0,-123.5,49.5,0)
my select statement doesn't work...
select MDSYS.SDO_GEOMETRY(3002,8307,null,MDSYS.SDO_ELEM_INFO_ARRAY(1,1002,1),MDSYS.SDO_ORDINATE_ARRAY(COORDS )
from eelgrass
But this works though..but I need it a more like above - I would like it as a view:
select 'MDSYS.SDO_GEOMETRY(3002,8307,null,MDSYS.SDO_ELEM_INFO_ARRAY(1,1002,1),MDSYS.SDO_ORDINATE_ARRAY(' || COORDS || '));'
from eelgrass
Is there an EVAL in oracle I can use for the COORDS column?
thanks
gordon
Edited by: user520811 on Nov 27, 2008 6:03 AM
Edited by: user520811 on Nov 27, 2008 7:20 AM

Answer 1

Don't think you can do that directly in SQL, you probably have to go to pl/sql
Example...
CREATE TABLE clob_test (
ID NUMBER,
GEOMETRY MDSYS.SDO_GEOMETRY);
INSERT INTO clob_test VALUES (
1, SDO_GEOMETRY(2002, 2157, NULL, SDO_ELEM_INFO_ARRAY(1, 2, 1), SDO_ORDINATE_ARRAY(583887.231, 768049.448, 583983.61, 768005.606, 584010.988, 768030.582)));
INSERT INTO user_sdo_geom_metadata VALUES ('clob_test','GEOMETRY', 
MDSYS.SDO_DIM_ARRAY(MDSYS.SDO_DIM_ELEMENT('X',0,0,0.0005), MDSYS.SDO_DIM_ELEMENT('Y',500000,1000000,0.0005)), 2157);
CREATE INDEX clob_test_spind ON clob_test(GEOMETRY) INDEXTYPE IS MDSYS.SPATIAL_INDEX;
DECLARE
l_coord CLOB;
l_sql VARCHAR2(4000);
l_count NUMBER;
BEGIN
l_coord := '583887.231, 768049.448, 583983.61, 768005.606';
l_sql :=
     'SELECT COUNT(*)
     FROM clob_test
     WHERE SDO_ANYINTERACT(geometry,
     MDSYS.SDO_GEOMETRY(2002, 2157, null, MDSYS.SDO_ELEM_INFO_ARRAY(1, 2, 1),
     MDSYS.SDO_ORDINATE_ARRAY(' || l_coord ||' )))     = ''TRUE''';
     EXECUTE IMMEDIATE l_sql INTO l_count;
     DBMS_OUTPUT.PUT_LINE(l_count);
END;
/