Retrieve / Search specific Node from XML File

Hello,
i have a question about reading (searching) XML File within PL SQL:
There is a XML file with following structure:
<root>
<Hnode1 attr1="value1" />
<Hnode2 attr1="value1" />
     <node1_of_Hnode2 id="10" personname="Steven"/>
     <node2_of_Hnode2 id="20" personname="Christian"/>
     <node3_of_Hnode2 id="30" personname="Arnold"/>
<Hnode2/>
<root/>How it is possible to filter a node by one of its attribute value. For example:
I know the id of a person - lets say id =20. In this case i would like to get the whole node (in this case node2_of_Hnode2) to get the personname => "Christian".
Just like a SELECT statement (WHERE ID = 20)
Is there a possibility the get this by one command or should it be looped over all Rows of the Document?. Can you please provide an example for me.
Thank you in advice!

Database version is 10.Sorry, that's not a version.
For example :
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bi
PL/SQL Release 10.2.0.5.0 - Production
CORE 10.2.0.5.0 Production
TNS for 64-bit Windows: Version 10.2.0.5.0 - Production
NLSRTL Version 10.2.0.5.0 - Production
How to use the extraction of values?
1.Better in Select statement; assigning directli in a variable or using xmlquery function?.PL/SQL or SQL calls to XMLType methods such as extract() or getStringVal() should be equivalent (putting aside the context switch).
However, none of them is the correct way to retrieve a scalar value from a given node.
You must use extractValue() function instead (SQL only) for release < 11.2 and XMLCast/XMLQuery starting with 11.2.
One more Question:
I have seen a lot of options to handle with XML Files.
So in my case only querying data in XML Files is relevant.
I have seen many APIs called XMLDOM, DMBS_XMLDOM, XMLTYPE...
When to use these APIS. Can you give me some input on that please?That's a broad topic.
A relevant answer will depend on your requirement.
- Do you have to process large files, and if so how large?
- Is performance/memory management a concern for you?
- Do you want to extract single values, or process the XML content as relational data?
If you have any specific test case to show us, please post in the {forum:id=34} forum, and make sure you include all the necessary details (see the FAQ).
Edited by: odie_63 on 23 févr. 2012 11:35

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