问题
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?
回答1:
Try this instead:
select xmltype(t.xml).extract('//fax/text()').getStringVal() from mytab t
回答2:
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.
回答3:
this query runs perfectly in my case
select xmltype(t.axi_content).extract('//Lexis-NexisFlag/text()').getStringVal() from ax_bib_entity t
回答4:
You can achieve with below queries
select extract(xmltype(xml), '//fax/text()').getStringVal() from mytab;
select extractvalue(xmltype(xml), '//fax') from mytab;
回答5:
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.
回答6:
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
来源:https://stackoverflow.com/questions/4884421/oracle-10g-extract-data-select-from-xml-clob-type