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AppendChildXML tips

Oracle Database Tips by Donald BurlesonApril 13, 2016

 

This function appends a user supplied XML tag onto the target XML document or an XML element in the path provided as the XPath expression.

 

The prototype for defining an AppendChildXML function is shown below,

 

AppendChildXML(<XML_Document> | <XML_Element>, <XPath_Expression>, <Child_XML>)

 

The cost tag is added to the XML document for the book ID 1001 using the AppendChildXML function as shown below,

 

UPDATE book_store

SET book_details_xml= appendchildxml(book_details_xml, '/Rack1', '<Cost>10$</Cost>') WHERE book_id=1001;

 

1 rows updated.

 

The addition of this child XML tag to the parent XML document can be verified by using the EXTRACTVALUE function as shown below,

 

select extractvalue(book_details_xml,'/Rack1/Cost') from book_store;

 

Result:

10$

 

When a duplicate child node is inserted into a single parent as shown below,

 

UPDATE book_store

SET book_details_xml=appendchildxml(book_details_xml,'/Rack1','<Cost>9$ for membership holders</Cost>')

WHERE book_id       =1001;

 

1 rows updated.

 

The values of the duplicate child nodes can be retrieved by using the square brackets with the appropriate indicator on the child node name as shown below,

 

select extractvalue(book_details_xml,'/Rack1/Cost[1]') from book_store;

 

Result:

10$

 

select extractvalue(book_details_xml,'/Rack1/Cost[2]') from book_store;

 

Result:

9$ for membership holders

APPENDCHILDXML appends XML content to a node. It works similar to INSERTCHILDXML; additionally, it can add different node types:

SELECT
   APPENDCHILDXML
   (
      OBJECT_VALUE,
      '/COUNTRY',
      XMLFOREST(7.5E6 AS POPULATION, '[+]' AS FLAG)
   ) APPENDCHILDXML
FROM
   WORLD;

APPENDCHILDXML
---------------------------------------------------
< COUNTRY ID="CH">
   <NAME>Switzerland</NAME>
   <CANTON_LIST>
      ...
   </CANTON_LIST>
   <POPULATION>7500000</POPULATION>
   <FLAG>[+]</FLAG>
< /COUNTRY>

 


   
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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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