Update the value of the node with particular attribute

Hello
Oracle 11g
I have a table with the following structure:

create table xml_test (test_id varchar2(12), xml_done xmltype);

The xml_done column uses the following structure (example XML):

<meas id="test">
  <data-elements>
    <data-element id="abc">
      <value>1</value>
    </data-element>
    <data-element id="def">
      <value>2</value>
    </data-element>
    <data-element id="ghi">
      <value>3</value>
    </data-element>
  </data-elements>
</meas>

I have a requirement to update the text in the < value > < / value > based on @attribute of the id in the data < item > which it is. In my code below, I'm updating the 1 value to be 'updated value'. I tried UPDATEXML without success:

UPDATE xml_Test SET XML_DONE =
   UPDATEXML(XML_DONE,
   '/meas/data-elements/data-element/value','updated value')
   WHERE extract(xml_done, '/meas/data-elements/data-element/@id') = 'abc' 
   and test_id = 1;

Any suggestions are appreciated, thank you very much!

Published by: chris001 on April 25, 2013 10:14

Hello

The WHERE clause filters the rows in the table, not within the XML document.
You must use an XPath predicate for this.

SQL> create table xml_test (test_id varchar2(12), xml_done xmltype);

Table created.

SQL>
SQL> insert into xml_test (test_id, xml_done)
  2  values ('1',
  3   xmlparse(document
  4  '
  5    
  6      
  7        1
  8      
  9      
 10        2
 11      
 12      
 13        3
 14      
 15    
 16  ')
 17  );

1 row created.

SQL> commit;

Commit complete.

SQL> update xml_test
  2  set xml_done =
  3      updatexml(
  4        xml_done
  5      , '/meas/data-elements/data-element[@id="abc"]/value/text()'
  6      , 'updated value'
  7      )
  8  where test_id = '1' ;

1 row updated.

SQL> set long 5000
SQL> set pages 100
SQL> select xml_done from xml_test where test_id = '1';

XML_DONE
--------------------------------------------------------------------------------

  
    
      updated value
    
    
      2
    
    
      3

If you also want to make sure that the line actually contains something to update, use XMLExists in the WHERE clause:

SQL> roll;
Rollback complete.
SQL> update xml_test
  2  set xml_done =
  3      updatexml(
  4        xml_done
  5      , '/meas/data-elements/data-element[@id="abc"]/value/text()'
  6      , 'updated value'
  7      )
  8  where test_id = '1'
  9  and xmlexists(
 10        '/meas/data-elements/data-element[@id=$id]'
 11        passing xml_done
 12              , 'abc' as "id"
 13      )
 14  ;

1 row updated.

SQL> select xml_done from xml_test where test_id = '1';

XML_DONE
--------------------------------------------------------------------------------

  
    
      updated value
    
    
      2
    
    
      3

If you are on 11.2.0.3, you can officially use XQuery Update instead.

Tags: Database

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Another thing:

Returns the local item: r {$i / eventtype,}

What what do you want with "local:" here?

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Connected to:
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SQL> create table tmp_xml of xmltype;

Table created.

SQL> insert into tmp_xml values (
  2  xmltype('
  3      
  4         XXX
  5         
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  7      
  8         YYY
  9         
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 11      
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 13         
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  2
  3   :orders := '
  4      
  5         merge
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 11         XXX
 12         123
 13      
 14      
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 17         
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 24  ';
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 26  end;
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SQL>
SQL> select /*+ no_xml_query_rewrite */
  2         xmlserialize(document
  3           xmlquery(
  4           'copy $d := $old
  5            modify (
  6              for $orderEntr in $orders/bookstore/book
  7              let $chgCd := $orderEntr/order
  8              let $orderTitle := $orderEntr/@title
  9              let $oldBooks := $d/bookstore
 10              let $oldBookEntr := $oldBooks/book[@title = $orderTitle]
 11              where not($orderEntr/following-sibling::book[@title = $orderTitle])
 12              return
 13                 if( $chgCd = "drop" and exists($oldBookEntr) )
 14                   then delete node $oldBookEntr
 15                 else if( exists($oldBookEntr) )
 16                        then replace node $oldBookEntr with $orderEntr
 17                      else insert node $orderEntr into $oldBooks
 18            )
 19            return $d'
 20           passing object_value as "old"
 21                 , xmlparse(document :orders) as "orders"
 22           returning content
 23           )
 24           indent
 25         ) as result
 26  from tmp_xml ;

RESULT
--------------------------------------------------------------------------------

  
    merge
    XXX
    123
  
  
    ZZZ
    
  
  
    merge
    ZZZ-2

It's another question, you probably already have the answer: I guess you must also remove the nodes of the newly merged books?

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Dmtrich,

Certainly, we can download and system flash here, just to be safe.

I'm sorry that you have had this problem, I sent you a PM and email and we can follow up there to work through your specific. Please let us know your concerns!

Best regards

Mark

Update the value of the node with particular attribute

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