This function deletes a user supplied
XML tag from the target XML document or an XML element,
which matches the path provided as the XPath expression.
The prototype for defining an
DELETEXML function is shown below,
DELETEXML(<XML_Document> | <XML_Element>,
<XPath_Expression>)
The SQL deletes the Cost tag from the
parent XML document as shown below,
UPDATE book_store
SET book_details_xml=deletexml(book_details_xml,'/Rack1/Cost')
WHERE book_id
=1001;
1 rows updated.
After the
Cost tag is
deleted from the parent XML document, the EXTRACTVALUE
function returns Null for that tag as it is not available
anymore as shown below.
select extractvalue(book_details_xml,'/Rack1/Cost')
from book_store;
Result:
Null
==================================================
DELETEXML
removes elements from the document.
SELECT
DELETEXML
(
DELETEXML
(
OBJECT_VALUE,
'//CANTON[DETAILS//LANGUAGE!="French"]'
),
'//DETAILS'
)
FROM
WORLD;
XMLSERIALIZE(DOCUMENTDELETEXML(D
--------------------------------
< COUNTRY ID="CH">
<NAME>Switzerland</NAME>
<CANTON_LIST>
<CANTON ID="VD">
<NAME>Vaud</NAME>
</CANTON>
<CANTON ID="NE">
<NAME>Neuchatel</NAME>
</CANTON>
<CANTON ID="GE">
<NAME>Geneva</NAME>
</CANTON>
<CANTON ID="JU">
<NAME>Jura</NAME>
</CANTON>
</CANTON_LIST>
< /COUNTRY>
The inner DELETEXMLremoves the cantons with a language different
than French and the outer DELETEXML removes every DETAILS
instance.
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