Oracle XMLType deleteXML problem

Question

Hi,
I am new using oracle xmltype, got a idiot problem when call deleteXML with xpath. I am hoping I can get help here. Code below describes how I did and what is the problem/
BTW, My oracle is
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
Thanks in advance.
Zhuang Zuo
software developer
[email protected]
===================================
-- step 1. create a table
create table XML_TABLE
uname varchar2(50),
xml_col xmltype
-- step 2. insert data
insert into xml_table
(uname, xml_col)
values (
'z1',
xmltype
<root>
<nodes>
<node attr="a" />
<node attr="b" />
</nodes>
</root>
-- step3. query data
select uname,
extract (xml_col, '/root') root,
extract (xml_col, '/root/nodes') nodes,
extract (xml_col, '/root/nodes/node') node,
extract (xml_col, '/root/nodes/node[@attr="a"]') node_a,
extract (xml_col, '/root/nodes/node[@attr="b"]') node_b
from xml_table
all above return data as expected.
-- "root" returns:
<root>
<nodes>
<node attr="a"/>
<node attr="b"/>
</nodes>
</root>
-- "nodes" returns:
<nodes>
<node attr="a"/>
<node attr="b"/>
</nodes>
-- "node" returns:
<node attr="a"/>
<node attr="b"/>
-- "node_a" returns:
<node attr="a"/>
-- "node_b" returns:
<node attr="b"/>
-- no problem so far
-- step 4. delete a node with xpath using update/deleteXML
update xml_table
set xml_col = deleteXML (xml_col, '/root/nodes/node[@attr="a"]')
where existsnode (xml_col, '/root/nodes/node[@attr="a"]') = 1
problem occurs here, showing in next step
-- step5. repeat step3, query data using same sql in step 3
--"root" returns data as expected:
<root>
<nodes>
<node attr="b"/>
</nodes>
</root>
--"nodes" returns data as expected:
<nodes>
<node attr="b"/>
</nodes>
--"node_a" return NO data, as expected
--however, "node", "node_b" return NO data either, even though "root" and "nodes" return correct data
why?
PLEASE HELP ....
Edited by: user10382724 on Apr 17, 2012 8:54 AM

Answer 1

Hi,
Looks like there's an issue with XML updating functions used over binary XMLType.
This thread describes a similar problem : {thread:id=1091574}
A possible workaround is the NO_XML_QUERY_REWRITE hint, but it's probably worth submitting the problem to Oracle Support anyway.