问题
Oracle version 11.2
Below is a cut down version of an XMLQuery i'm running on an XMLType column. When I run the query, which simply parses and recreates the stored XML, the tsxm namespace (that is not equal to the default namespace ) gets changed. This query does nothing and could easily be rewritten, but the real (much bigger) query uses this same methodology so this is why i'm posting the question in this format. If I change the tsxm namespace definition to be the same as the default namespace :
xmlns:tsxm="http://schemas.thomson.com/ts/20041221/tsip"
then the problem goes away, but in the real application this is not possible.
create the table:
CREATE TABLE XML_DOCUMENT_TMP
(
DOCUMENT_ID NUMBER(12) NOT NULL,
XML_DATA SYS.XMLTYPE NOT NULL,
CREATED_DATE TIMESTAMP(6) NOT NULL
);
Insert some data:
insert into XML_DOCUMENT_TMP
(document_id,created_date,xml_data)
values(1,sysdate,'<patent xmlns="http://schemas.thomson.com/ts/20041221/tsip"
xmlns:tsip="http://schemas.thomson.com/ts/20041221/tsip"
xmlns:tsxm="http://schemas.thomson.com/ts/20041221/tsxm"
tsip:action="replace" tsip:cc="CA" tsip:se="2715340" tsip:ki="C">
<accessions tsip:action="replace">
<accession tsip:src="wila" tsip:type="key">CA-2715340-C</accession>
<accession tsip:src="tscm" tsip:type="tscmKey">CA-2715340-C-20150804</accession>
</accessions>
<claimed tsip:action="replace">
<claimsTsxm tsip:lang="en">
<tsxm:heading tsxm:align="left">We Claim:</tsxm:heading>
<claimTsxm tsip:no="1" tsxm:num="1" tsip:type="main">1. power.</claimTsxm>
</claimsTsxm>
</claimed>
');
Run the XMLQuery:
WITH tmpTable AS (
SELECT * FROM XML_DOCUMENT_TMP cm )
SELECT tt.xml_data ,
XMLQuery('declare default element namespace "http://schemas.thomson.com/ts/20041221/tsip";
declare namespace tsip="http://schemas.thomson.com/ts/20041221/tsip";
declare namespace tsxm="http://schemas.thomson.com/ts/20041221/tsxm";
let $patsLus := $m/patent/*
return
<patent>{$m/patent/@*}
{
for $i in $m/patent/*
return $i
}
</patent>'
PASSING tt.xml_data as "m" RETURNING CONTENT) newXml
FROM tmpTable tt
WHERE tt.document_id in (1);
Returns:
<patent xmlns="http://schemas.thomson.com/ts/20041221/tsip" xmlns:syspfx_AT="http://schemas.thomson.com/ts/20041221/tsip" syspfx_AT:action="replace" syspfx_AT:cc="CA" syspfx_AT:se="2715340" syspfx_AT:ki="C"><accessions xmlns="http://schemas.thomson.com/ts/20041221/tsip" action="replace">
<accession src="wila" type="key">CA-2715340-C</accession>
<accession src="tscm" type="tscmKey">CA-2715340-C-20150804</accession>
</accessions>
<claimed xmlns="http://schemas.thomson.com/ts/20041221/tsip" action="replace">
<claimsTsxm lang="en">
<syspfx_1:heading xmlns:syspfx_1="http://schemas.thomson.com/ts/20041221/tsxm" syspfx_1:align="left">We Claim:</syspfx_1:heading>
<claimTsxm no="1" xmlns:syspfx_1="http://schemas.thomson.com/ts/20041221/tsxm" syspfx_1:num="1" type="main">1. power.</claimTsxm>
</claimsTsxm>
</claimed>
</patent>
So , the question is, what is causing the tsxm namespace declaration to be changed to syspfx_AT and the tsxm namespace prefix to xmlns:syspfx_1?
Any ideas much appreciated.
回答1:
This appears to be expected behaviour, according to My Oracle Support doc ID 2060374.1. But from a bit of experimentation it seems that wildcarding the namespace in your XPath stops it happening; so:
<patent>{$m/*:patent/@*}
{
for $i in $m/*:patent/*
return $i
}
</patent>'
With your original data (in 11.2.0.4), and serialized to format it more readably:
WITH tmpTable AS (
SELECT * FROM XML_DOCUMENT_TMP cm )
SELECT tt.xml_data ,
XMLSerialize(DOCUMENT
XMLQuery('declare default element namespace "http://schemas.thomson.com/ts/20041221/tsip";
declare namespace tsip="http://schemas.thomson.com/ts/20041221/tsip";
declare namespace tsxm="http://schemas.thomson.com/ts/20041221/tsxm";
let $patsLus := $m/patent/*
return
<patent>{$m/*:patent/@*}
{
for $i in $m/*:patent/*
return $i
}
</patent>'
PASSING tt.xml_data as "m" RETURNING CONTENT)
AS VARCHAR2(4000) INDENT SIZE = 2) ewXml
FROM tmpTable tt
WHERE tt.document_id in (1);
XML_DATA
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
NEWXML
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
<patent xmlns="http://schemas.thomson.com/ts/20041221/tsip" xmlns:tsip="http://schemas.thomson.com/ts/20041221/tsip" xmlns:tsxm="http://schemas.thomson.com/ts/20041221/tsxm" tsip:action="replace" tsip:cc="CA" tsip:se="2715340" tsi
p:ki="C">
<accessions tsip:action="replace">
<accession tsip:src="wila" tsip:type="key">CA-2715340-C</accession>
<accession tsip:src="tscm" tsip:type="tscmKey">CA-2715340-C-20150804</accession>
</accessions>
<claimed tsip:action="replace">
<claimsTsxm tsip:lang="en">
<tsxm:heading tsxm:align="left">We Claim:</tsxm:heading>
<claimTsxm tsip:no="1" tsxm:num="1" tsip:type="main">1. power.</claimTsxm>
</claimsTsxm>
</claimed>
</patent>
<patent xmlns="http://schemas.thomson.com/ts/20041221/tsip" xmlns:tsip="http://schemas.thomson.com/ts/20041221/tsip" tsip:action="replace" tsip:cc="CA" tsip:se="2715340" tsip:ki="C">
<accessions xmlns="http://schemas.thomson.com/ts/20041221/tsip" xmlns:tsip="http://schemas.thomson.com/ts/20041221/tsip" tsip:action="replace">
<accession tsip:src="wila" tsip:type="key">CA-2715340-C</accession>
<accession tsip:src="tscm" tsip:type="tscmKey">CA-2715340-C-20150804</accession>
</accessions>
<claimed xmlns="http://schemas.thomson.com/ts/20041221/tsip" xmlns:tsip="http://schemas.thomson.com/ts/20041221/tsip" tsip:action="replace">
<claimsTsxm tsip:lang="en">
<tsxm:heading xmlns:tsxm="http://schemas.thomson.com/ts/20041221/tsxm" tsxm:align="left">We Claim:</tsxm:heading>
<claimTsxm tsip:no="1" xmlns:tsxm="http://schemas.thomson.com/ts/20041221/tsxm" tsxm:num="1" tsip:type="main">1. power.</claimTsxm>
</claimsTsxm>
</claimed>
</patent>
That isn't identical to your original but doesn't have the namespace corruption any more. Whether you can do that in your real query, and whether the wildcarding causes any issues for that, are another matter...
来源：https://stackoverflow.com/questions/38632694/oracle-xmlquery-is-corrupting-the-namespace