Oracle 10g: Extract data (select) from XML (CLOB Type)

Question

I'm new in Oracle and I've - maybe trivial - a problem in a select. (I'm using Oracle 10g Express Edition).

I've a DB with a field CLOB: mytab.xml This column have an XML like this:

<?xml version="1.0" encoding="iso-8859-1"?>
<info>
<id> 954 </id>
<idboss> 954 </idboss>
<name> Fausto </name>
<sorname> Anonimo </sorname>
<phone> 040000000 </phone>
<fax> 040000001 </fax>
</info>

I'm trying to do a 'simple' select to get, for example, the value of 'fax' tag. But I've a bit of problem and I'm not able to understand my error. For example:

select extract(xml, '//fax').getStringVal() from mytab;
ORA-00932: inconsistent datatypes: expected - got

select extract(xmltype(xml), '//fax').getStringVal() from mytab;
ORA-06502: PL/SQL: numeric or value error
ORA-06512: at "SYS.XMLTYPE", line 254

I've tryed also with 'extractvalue', but I've the same problems. where I'm wrong to do this?

score 32 · Accepted Answer · answered Feb 03 '11 at 09:46

32

Try this instead:

select xmltype(t.xml).extract('//fax/text()').getStringVal() from mytab t

answered Feb 03 '11 at 09:46

dogbane

266,786
75
396
414

not yet:ORA-06502: PL/SQL: numeric or value error ORA-06512: at "SYS.XMLTYPE", line 254 ORA-06512: at line 1 – mymark Feb 03 '11 at 10:02
Sorry.... yes, your answer work perfectly! In previous case I've got an xml null ^^! – mymark Feb 03 '11 at 12:47
In 11g I can leave `.getStringVal()`-part out. No idea about 10g as I don't have any here. – user272735 May 27 '11 at 06:22

score 3 · Answer 2 · edited May 14 '15 at 13:28

Try using xmltype.createxml(xml).

As in,

select extract(xmltype.createxml(xml), '//fax').getStringVal() from mytab;

It worked for me.

If you want to improve or manipulate even further.

Try something like this.

Select *
from xmltable(xmlnamespaces('some-name-space' as "ns", 
                                  'another-name-space' as "ns1",
                           ), 
                    '/ns/ns1/foo/bar'
                    passing xmltype.createxml(xml) 
                    columns id varchar2(10) path '//ns//ns1/id',
                            idboss varchar2(500) path '//ns0//ns1/idboss',
                            etc....

                    ) nice_xml_table

Hope it helps someone.

score 0 · Answer 3 · answered May 29 '13 at 11:32

0

this query runs perfectly in my case

select xmltype(t.axi_content).extract('//Lexis-NexisFlag/text()').getStringVal() from ax_bib_entity t

answered May 29 '13 at 11:32

user6691970

1

score 0 · Answer 4 · edited Apr 11 '14 at 13:23

0

You can achieve with below queries

select extract(xmltype(xml), '//fax/text()').getStringVal() from mytab;
select extractvalue(xmltype(xml), '//fax') from mytab;

edited Apr 11 '14 at 13:23

neubert

15,947
24
120
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answered Apr 11 '14 at 13:03

Ravi

1

score 0 · Answer 5 · answered Jun 16 '16 at 07:11

You can try creating DBMS_XMLPARSER.parser object from the CLOB XML and get a DBMS_XMLDOM.DOMDocument object from it. Then use DBMS_XMLDOM package methods to get the value of any node.

   xml_            CLOB := 'X';
   p               DBMS_XMLPARSER.parser;
   doc_            DBMS_XMLDOM.DOMDocument;

      -- Convert the CLOB into a XML-document
      P := DBMS_XMLPARSER.newparser();
      -- Parse the clob and get the XML-document
      DBMS_XMLPARSER.parseclob(p, xml_);
      doc_ := DBMS_XMLPARSER.getDocument(p);

Then use the below methods to extract node value

DBMS_XMLDOM.getElementsByTagName(doc_, 'NodeName'); DBMS_XMLDOM.GetNodeValue(node_obj_);

Refer more about DBMS_XMLDOM methods here.

score 0 · Answer 6 · answered Mar 08 '17 at 11:44

In case of :

<?xml version="1.0" encoding="iso-8859-1"?>
<info xmlns="http://namespaces.default" xmlns:ns2="http://namespaces.ns2" >
    <id> 954 </id>
    <idboss> 954 </idboss>
    <name> Fausto </name>
    <sorname> Anonimo </sorname>
    <phone> 040000000 </phone>
    <fax> 040000001 </fax>
</info>

Query :

Select *
from xmltable(xmlnamespaces(default 'http://namespaces.default'
                              'http://namespaces.ns2' as "ns",
                       ), 
                '/info'
                passing xmltype.createxml(xml) 
                columns id varchar2(10) path '/id',
                        idboss varchar2(500) path '/idboss',
                        etc....

                ) nice_xml_table

score 0 · Answer 7 · edited Aug 10 '20 at 06:35

In case the XML store in the CLOB field in the database table. E.g for this XML:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Awmds>
    <General_segment>
        <General_segment_id>
        <Customs_office_code>000</Customs_office_code>
    </General_segment_id>
</General_segment>
</Awmds>

This is the Extract Query:

SELECT EXTRACTVALUE (
    xmltype (T.CLOB_COLUMN_NAME),
    '/Awmds/General_segment/General_segment_id/Customs_office_code')
    AS Customs_office_code
FROM TABLE_NAME t;

Oracle 10g: Extract data (select) from XML (CLOB Type)

7 Answers7

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