updating CLOB column with multiple namespace in Oracle - oracle

Question

I am trying to update an element which is inside a clob column in oracle DB.
First challenge I am facing is that my clob xml has 2 namespaces and I am not able to get that working .
<?xml version="1.0"?>
<esbmsg:EsbMessage xmlns:esbmsg="http://www.test.com/esb/message/1.0">
<esbmsg:Body>
<Transaction xmlns="http://test.com">
<test-element>
<finalElement>false</finalElement>
</test-elemen>
</Transaction>
</esbmsg:Body>
</esbmsg:EsbMessage>
select x.* from cc_messagehistory y
cross join xmltable(
xmlnamespaces('http://www.test.com/esb/message/1.0' as "esbmsg",
'http://test.com ' ),
'/esbmsg:EsbMessage'
passing xmltype.createxml(y.payload)
factext varchar2(10) path '/esbmsg:EsbMessage/esbmsg:Body/Transaction/test-element/finalElement'
) x;
ORA-19102: XQuery string literal expected
19102. 00000 - "XQuery string literal expected"
*Cause: The string literal containing the XQuery expression was missing.
*Action: Specify the XQuery expression as a string literal. Error at Line: 64 Column: 99

Answer 1

The immediate cause of the ORA-01902 is that you missed the default keyword:
xmlnamespaces('http://www.test.com/esb/message/1.0' as "esbmsg",
default 'http://test.com'),
I've removed the extra space at the end of the URI, which would cause problems later. But you are also missing the columns keyword, and you can simplify the conversion of the CLOB value to an XMLType.
Putting that together, and with a CTE to supply your (corrected) sample XML:
-- CTE for sample data
with cc_messagehistory(payload) as (
select to_clob('<?xml version="1.0"?>
<esbmsg:EsbMessage xmlns:esbmsg="http://www.test.com/esb/message/1.0">
<esbmsg:Body>
<Transaction xmlns="http://test.com">
<test-element>
<finalElement>false</finalElement>
</test-element>
</Transaction>
</esbmsg:Body>
</esbmsg:EsbMessage>') from dual
)
-- actual query
select x.*
from cc_messagehistory y
cross join xmltable (
xmlnamespaces (
'http://www.test.com/esb/message/1.0' as "esbmsg",
default 'http://test.com'
),
'/esbmsg:EsbMessage'
passing xmltype(y.payload)
columns factext varchar2(10)
path '/esbmsg:EsbMessage/esbmsg:Body/Transaction/test-element/finalElement'
) x;
FACTEXT
----------
false
For the update you could do something like:
update cc_messagehistory y
set payload = XMLSerialize(document
XMLQuery('declare default element namespace "http://test.com"; (: :)
declare namespace esbmsg="http://www.test.com/esb/message/1.0"; (: :)
copy $i := $xml modify (
for $j in $i//esbmsg:EsbMessage/esbmsg:Body/Transaction/test-element/finalElement
return replace value of node $j with $new
)
return $i'
passing xmltype(y.payload) as "xml",
'true' AS "new"
returning content
)
indent size=2
)
where xmlexists('declare default element namespace "http://test.com"; (: :)
declare namespace esbmsg="http://www.test.com/esb/message/1.0"; (: :)
$xml//esbmsg:EsbMessage/esbmsg:Body/Transaction/test-element/finalElement[text()="false"]'
passing xmltype(y.payload) as "xml");
which transforms that source CLOB into:
<?xml version="1.0"?>
<esbmsg:EsbMessage xmlns:esbmsg="http://www.test.com/esb/message/1.0">
<esbmsg:Body>
<Transaction xmlns="http://test.com">
<test-element>
<finalElement>true</finalElement>
</test-element>
</Transaction>
</esbmsg:Body>
</esbmsg:EsbMessage>
db<>fiddle (works on 18c; errors on 11gR2, but patch levels may make a difference; also tested successfully elsewhere on 12cR1)