XML data. Extraction of elements and attributes using Xpath or another?

Hi experts,
With the help of Oracle 11 g.
I have an XML table that stores XML in a column (xml_col) like the structure below.
Example:
<measure id="abc">
  <data-elements>
    <data-element id="ab">
      <value>40</value>
    </data-element>
    <data-element id="cd">
      <value>8</value>
    </data-element>
    <data-element id="ef">
      <value>38</value>
    </data-element>
    <data-element id="gh">
      <value>32</value>
    </data-element>
  </data-elements>
</measure>
I tried constantly to run XPath queries on this column to get the node < element > attribute data and the value of the < value > node in.

My goal is to turn this into a table of:

AB | 40
CD | 8
EF | 38
GH | 32


My mind is stuck on him doing this below and dressing with a CSV file to query hierarchical lines. I can't convert xmltype in chain to do this work so.
select str1,str2 from (
select extract(xml_col, 'string-join(//@id, '','')') str1
,extract(xml_col, 'string-join(//value, '','')') str2
from xml_temp_table)
CONNECT BY LEVEL <= LENGTH (REGEXP_REPLACE (str1, '[^,]+')) + 1;
But I get the following error:

ORA-31011: XML parsing failed
ORA-19202: an error has occurred in the processing of XML
LPX-00607: Invalid Reference: "string-join".

I am looking for a solution not PL.

Any suggestion is appreciated.
Thank you

Published by: chris001 on February 26, 2013 12:06

Published by: chris001 on February 26, 2013 12:07

chris001 wrote:
My mind is stuck on him doing this below and dressing with a CSV file to query hierarchical lines. I can't convert xmltype in chain to do this work so.

Oh boy!

This should relieve your pain ;)

SQL> select x.*
  2  from xml_temp_table t
  3     , xmltable(
  4         '/measure/data-elements/data-element'
  5         passing t.xml_col
  6         columns element_id  varchar2(10) path '@id'
  7               , element_val number       path 'value'
  8       ) x ;

ELEMENT_ID ELEMENT_VAL
---------- -----------
ab                  40
cd                   8
ef                  38
gh                  32
 

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