10g XMLTABLE - can I return col XMLTYPE as well as retrieve specific columns

Hello

(This is for version 10.2.0.4)

Currently, we have a giant XML column that contains many pieces to it. Divide us those in different parties through XMLSEQUENCE and then go to extract information from the other two XMLTYLE columns. I wish I could use XMLTABLE to reach the XMLTYPE columns to each other in a SQL statement, because I think it should be more effective. (We will have problems when the large XML column has 400 or more parts in - closure and do extract the values in two columns of xmltype + 400 times turns out to be slow going!)

Anyway, I want to do is use XMLTABLE to produce a table for each column-shaped structure, then join them if this 1st part of col1 = part 1 in col2 = 1st party to col3.

I looked around the documentation and google, but I'm stuck at a particular point: I would like to return XMLTYPE as values extracted from this XMLTYPE in the XMLTABLE on each column. I can't find a way to do it.

Here is an example (that I got from http://thinktibits.blogspot.com/2011/03/oracle-xmltable-example-part-1.html) that hopefully will explain more clearly what I want to do, taking a column starting with:
CREATE TABLE xml_test
(NOTEBOOK XMLTYPE);

insert into xml_test values ('<?xml version="1.0" encoding="UTF-8"?><Product Type=''Laptop''><Notebook Brand="HP" Model="Pavilion dv6-3132TX Notebook"><Harddisk>640 GB</Harddisk><Processor>Intel Core i7</Processor><RAM>4 GB</RAM></Notebook><Notebook Brand="HP" Model="HP Pavilion dv6-3032TX Notebook"><Harddisk>640 GB</Harddisk><Processor>Intel Core i7</Processor><RAM>6 GB</RAM></Notebook><Notebook Brand="Toshiba" Model="Satellite A660/07R 3D Notebook"><Harddisk>640 GB</Harddisk><Processor>Intel Core i7</Processor><RAM>4 GB</RAM></Notebook><Notebook Brand="Toshiba" Model="Satellite A660/15J Notebook"><Harddisk>640 GB</Harddisk><Processor>Intel Core i5</Processor><RAM>6 GB</RAM></Notebook></Product>');

commit;

SELECT NOTEBOOKS1.*
  FROM xml_test PO,
       XMLTable('//Notebook' PASSING PO.NOTEBOOK) notebooks1;
       
COLUMN_VALUE                                                                                                                                           
-------------------------------------------------------------------------------------------------------------------------------------------------------
<Notebook Brand="HP" Model="Pavilion dv6-3132TX Notebook"><Harddisk>640 GB</Harddisk><Processor>Intel Core i7</Processor><RAM>4 GB</RAM></Notebook>
<Notebook Brand="HP" Model="HP Pavilion dv6-3032TX Notebook"><Harddisk>640 GB</Harddisk><Processor>Intel Core i7</Processor><RAM>6 GB</RAM></Notebook>
<Notebook Brand="Toshiba" Model="Satellite A660/07R 3D Notebook"><Harddisk>640 GB</Harddisk><Processor>Intel Core i7</Processor><RAM>4 GB</RAM></Notebook>
<Notebook Brand="Toshiba" Model="Satellite A660/15J Notebook"><Harddisk>640 GB</Harddisk><Processor>Intel Core i5</Processor><RAM>6 GB</RAM></Notebook>

4 rows selected.

SELECT NOTEBOOKS2.*
  FROM xml_test PO,
       XMLTable('//Notebook' PASSING PO.NOTEBOOK
       COLUMNS  row_num for ordinality,
                "BrandType"    CHAR(10) PATH '@Brand',
                "ProductModel" CHAR(50) PATH '@Model',
                "Harddisk" CHAR(10) PATH 'Harddisk',
                "Processor" CHAR(20) PATH 'Processor',
                "RAM" CHAR(10) PATH 'RAM') AS NOTEBOOKS2;

   ROW_NUM BrandType  ProductModel                                       Harddisk   Processor            RAM       
---------- ---------- -------------------------------------------------- ---------- -------------------- ----------
         1 HP         Pavilion dv6-3132TX Notebook                       640 GB     Intel Core i7        4 GB      
         2 HP         HP Pavilion dv6-3032TX Notebook                    640 GB     Intel Core i7        6 GB      
         3 Toshiba    Satellite A660/07R 3D Notebook                     640 GB     Intel Core i7        4 GB      
         4 Toshiba    Satellite A660/15J Notebook                        640 GB     Intel Core i5        6 GB      

4 rows selected.
What I would like is to have the first statement COLUMN_VALUE select content to appear as a column in the second selection - is this possible?

In the worst case, I could join, only it generates a Cartesian product, because I do not know how to qualify the lines from the first XMLTABLE query (if I used the rownum in the query itself, that guarantee to come out in the same order as the XMLTABLE results? Would be part 1 always labeled tier 1, part 2, row2, etc.?).

I hope this makes some kind of sense - I'm not on terms XML, unfortunately.

ETA: If there is no way to achieve through XMLTABLE, is there any other way to reach him?

Published by: Boneist on December 2, 2011 17:14

Hello

Define an additional XMLType projection in the clause of COLUMNS with PATH = '.' (the context item):

SQL> set long 500
SQL>
SQL> SELECT x1.*
  2  FROM xml_test t
  3     , XMLTable('/Product/Notebook' PASSING t.notebook
  4         COLUMNS rn FOR ORDINALITY
  5               , BrandType      VARCHAR2(10) PATH '@Brand'
  6               , ProductModel   VARCHAR2(50) PATH '@Model'
  7               , Harddisk       VARCHAR2(10) PATH 'Harddisk'
  8               , Processor      VARCHAR2(20) PATH 'Processor'
  9               , RAM            VARCHAR2(10) PATH 'RAM'
 10               , NoteBook_node  XMLType      PATH '.'
 11       ) x1
 12  ;

        RN BRANDTYPE  PRODUCTMODEL                                       HARDDISK   PROCESSOR            RAM        NOTEBOOK_NODE
---------- ---------- -------------------------------------------------- ---------- -------------------- ---------- --------------------------------------------------------------------------------
         1 HP         Pavilion dv6-3132TX Notebook                       640 GB     Intel Core i7        4 GB       
                                                                                                                      640 GB
                                                                                                                      Intel Core i7
                                                                                                                      4 GB
                                                                                                                    

         2 HP         HP Pavilion dv6-3032TX Notebook                    640 GB     Intel Core i7        6 GB       
                                                                                                                      640 GB
                                                                                                                      Intel Core i7
                                                                                                                      6 GB
                                                                                                                    

         3 Toshiba    Satellite A660/07R 3D Notebook                     640 GB     Intel Core i7        4 GB       
                                                                                                                      640 GB
                                                                                                                      Intel Core i7
                                                                                                                      4 GB
                                                                                                                    

         4 Toshiba    Satellite A660/15J Notebook                        640 GB     Intel Core i5        6 GB       
                                                                                                                      640 GB
                                                                                                                      Intel Core i5
                                                                                                                      6 GB

I'm not sure that understand the rest of your condition.
You want to still break through the XMLType generated in a set of relational lines, or repeat on different columns of the same base table?

Tags: Database

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