Inserting nested records from XML to DB

Question

Hi,
I am facing a problem with inserting nested records in XML to DB. For example, I have this XML:
<?xml version="1.0" encoding="utf-8" ?>
<ns0:CutLOTUpdate xmlns:ns0="http://LayoutTracking/v1.0">
<C>1</C>
<COMMENTS>Main1</COMMENTS>
<CUT_DATA>
<CUT>
<D>1</D>
<COMMENTS>2Main1</COMMENTS>
<IT>
<E>11</E>
<COMMENTS>3Det1</COMMENTS>
</IT>
<IT>
<E>12</E>
<COMMENTS>3Det2</COMMENTS>
</IT>
</CUT>
<CUT>
<D>2</D>
<COMMENTS>2Main2</COMMENTS>
<IT>
<E>21</E>
<COMMENTS>3Det1</COMMENTS>
</IT>
<IT>
<E>22</E>
<COMMENTS>3Det2</COMMENTS>
</IT>
</CUT>
</CUT_DATA>
</ns0:CutLOTUpdate>
I would like to insert these data into the following table in a denormalized form:
CREATE TABLE A (
C NUMBER,
D NUMBER,
E NUMBER,
C_COMMENTS VARCHAR2(50),
D_COMMENTS VARCHAR2(50),
E_COMMENTS VARCHAR2(50))
I have tried using this procedure:
CREATE OR REPLACE PROCEDURE insc (Cut_Clob CLOB) AS
Cut XMLType;
BEGIN
/*Converts Cut_Clob parameter into XML */
Cut := sys.xmltype.createXML(Cut_Clob);
/*Inserts data from XML to table*/
INSERT INTO a
( C ,
C_COMMENTS ,
D ,
D_COMMENTS ,
E ,
E_COMMENTS )
SELECT DISTINCT
ExtractVALUE(CUT, '/ns0:CutLOTUpdate/C' , 'xmlns:ns0="http://LayoutTracking/v1.0') C,
ExtractValue(CUT, '/ns0:CutLOTUpdate/COMMENTS', 'xmlns:ns0="http://LayoutTracking/v1.0') C_COMMENTS,
ExtractVALUE(value(ct), '/CUT/D') D,
ExtractValue(value(ct), '/CUT/D_COMMENTS') D_COMMENTS,
ExtractVALUE(value(it), '/IT/E') E,
ExtractValue(value(it), '/IT/E_COMMENTS') E_COMMENTS
FROM TABLE (xmlsequence(extract(CUT,'/ns0:CutLOTUpdate/CUT_DATA/CUT','xmlns:ns0="http://LayoutTracking/v1.0'))) ct,
TABLE (xmlsequence(extract(CUT,'/ns0:CutLOTUpdate/CUT_DATA/CUT/IT','xmlns:ns0="http://LayoutTracking/v1.0'))) it;
COMMIT;
END;
However, this resulted into a cartesian product.
Is it possible for me to insert this XML into such table? If yes, can anyone show me how?
I apologize if this seems trivial to you and I appreciate your time for helping me.
Thank you,
Kaye

Answer 1

Hi,
I have tried:
FROM TABLE (xmlsequence(extract(CUT,'/ns0:CutLOTUpdate/CUT_DATA/CUT','xmlns:ns0="http://LayoutTracking/v1.0'))) ct,
TABLE (xmlsequence(extract(CUT,'/ns0:CutLOTUpdate/CUT_DATA/CUT/IT','xmlns:ns0="http://LayoutTracking/v1.0'))) it;
This did not work - resulting in Cartesian product.
I am working with Oracle 10g DB 10.2.0.1.
If it's not too much, I am hoping that someone could show me a script to parse this XML and actually place it in a denormalized form.
If you think this is not possible, can you please just point me to an example where the same XML (with nested information) can be inserted into 3 different tables (relational)?
I have tried searching on different sources, to no avail. I am a beginner on this... I apologize for any inconveniece caused.