Xml dom with pl/sql or java

Hi,
For increase speed an procedure with xmldom, wich langage can I use ? pl/sql or java
Thanks
Ben

I also recall readings somewhere how Oracle have coded the database packages into native C to boost performance, but for the life of me I can't recall where it was now.
I've not done any Java parsing work, but I have been using PL/SQL to parse XML Schema documents (which are in effect XML documents so there's no difference there really). I found that all I needed to be able to parse the XML schema so that I could navigate through the document and carry out my own processing was the use of the DBMS_XMLDOM package. This allowed me to navigate from the root element down through the siblings and children elements and extract the attributes and any data that was required on the way.
The Oracle PL/SQL Packages and Types Reference details all the available built-in packages sufficiently well.
Regards

Similar Messages

Building portlets with PL/SQl vs java

Hi
We are planing to use oracle 9iAS application server(Enterprise version)to build portal application.
Can someone suggest me which one should i use, building portlets with j2ee or building portlets with PL/SQL.
what are the advantages of web providers over database providers?which one is the best way of building portlets.

Hello
I've been using Portal for years now, and I'm still developping in PL/SQL. It's very simple and quick to developp. I'm even not using any database providers, I'm just invoking my procedures via their URLs with some Ajax hidden components, and I could developp some screens like employees vacations managements, trombinoscope, portal statistics, etc ...
I learnt at Oracle how to developp some "true" portlets with DB providers but it's not usefull for me at this time as I don't need portlet customization etc.
BUT
if I had to developp a really big project with several developpers I would use DB providers.
And maybe I would use Java but it takes rather long time to be efficient with this language and it needs to be a realy big project for I start using this language. And as explained above Java offers more compatibility with 3rd party products.
And last but not least, one has to know what Oracle is more and more dealing with Java, the next 11g version that has just released is much more using Java than 10g does, and that's true for every Oracle products.
So it's just a matter of skill and time.
A.

Update passed in XML doc with pl/sql xmldom

Hi,
I have an xml document that is passed in through a stored procedure as CLOB. I'm trying to use the XMLParser and XMLDOM to add an additional node
The XML looks something like the following
<rowset>
<row>
<firstname>john</firstname>
</row>
<row>
<firstname>jane</firstname>
</row>
</rowset>
I need to loop through each of <mynames> nodes and then add another node <lastame> so it looks like the following
<rowset>
<row>
<firstname>john</firstname>
<lastame>smith</lastame>
</row>
<row>
<firstname>jane</firstname>
<lastame>smith</lastame>
</row>
</rowset>
I have the following code
parseClob XMLPARSER.Parser;
newNames XMLDOM.DOMDocument;
tempNode XMLDOM.DOMNode;
mye xmldom.domelement;
     item_text xmldom.DOMText;
numofrows number;
     nodeList xmldom.DOMNodeList;
     newnode xmldom.domnode;
parseClob := xmlparser.newParser;
XMLPARSER.parseClob(parseClob,names);
newNames := XMLPARSER.getDocument(parseClob);
XMLPARSER.freeParser(parseClob);
nodeList := xslprocessor.selectNodes(xmldom.makeNode(newNames), '//rowset/row');
numOfRows := xmldom.getlength(nodeList)-1;
for i in 0..numOfRows LOOP
newnode := xmldom.item(nodeList, i);
          --create the new node
mye := xmldom.createElement(newName, 'lastname');
--add it to the new node
tempNode := xmldom.appendChild(newnode, xmldom.makeNode(mye));
--update the text in the lastname
item_text := xmldom.createTextNode(newNames, 'smith');
tempNode := xmldom.appendChild(tempNode, xmldom.makeNode(item_text));
end loop;
what happens is that when i write out the newnode xml out to a buffer i see the <lastname> tag
but when i write out the newNames xml out to a buffer after the loop is finished the <lastname> tag is
missing. like it didn't update the newNames xml
I've seen lots of example on how to create an XML document with the DOM from scratch but nothing about updating
an passed in xml document. any help would be appreciated

Updatexml is reference in Oracle 9i, I'm sorry i should have mentioned that I am using oracle 8i. Is there something you can use in oracle 8i?

Creating XML DOM with Escape characters

I am using DOM to generate xml fie. Setting some chinese character string which is hardcoded for one of node value.
When i am setting value to xml node i am passing it as "∆" but DOM automatically converts this string and store into xml file as "&#x2206"
Because of this i can not show proper chinese characters in PDF. How i can avoid this ? Is it possible to store chinese character as "&#x2206" itself inside xml?
regards
Manisha

When setting the value from java you can use the real unicode character. Assuming with ࢞ you want to write the Unicode-Character at Codepoint 0x2206 you could just use "\u2206" in a java String to encode it. The XML library has to take care of how it's encoded in the final xml file.

Slow extraction in big XML-Files with PL/SQL

Hello,
i have a performance problem with the extraction from attributes in big XML Files. I tested with a size of ~ 30 mb.
The XML file is a response of a webservice. This response include some metadata of a document and the document itself. The document is inline embedded with a Base64 conversion. Here is an example of a XML File i want to analyse:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
   <soap:Body>
      <ns2:GetDocumentByIDResponse xmlns:ns2="***">
         <ArchivedDocument>
            <ArchivedDocumentDescription version="1" currentVersion="true" documentClassName="Allgemeines Dokument" csbDocumentID="***">
               <Metadata archiveDate="2013-08-01+02:00" documentID="123">
                  <Descriptor type="Integer" name="fachlicheId">
                     <Value>123<Value>
                  </Descriptor>
                  <Descriptor type="String" name="user">
                     <Value>***</Value>
                  </Descriptor>
                  <InternalDescriptor type="Date" ID="DocumentDate">
                     <Value>2013-08-01+02:00</Value>
                  </InternalDescriptor>
                  
               </Metadata>
               <RepresentationDescription default="true" description="Description" documentPartCount="1" mimeType="application/octet-stream">
                  <DocumentPartDescription fileName="20mb.test" mimeType="application/octet-stream" length="20971520 " documentPartNumber="0" hashValue=""/>
               </RepresentationDescription>
            </ArchivedDocumentDescription>
            <DocumentPart mimeType="application/octet-stream" length="20971520 " documentPartNumber="0" representationNumber="0">
               <Data fileName="20mb.test">
                  <BinaryData>
                    
                  </BinaryData>
               </Data>
            </DocumentPart>
         </ArchivedDocument>
      </ns2:GetDocumentByIDResponse>
   </soap:Body>
</soap:Envelope>
Now i want to extract the filename and the Base64 converted document from this XML response.
For the extraction of the filename i use the following command:
v_filename := apex_web_service.parse_xml(v_xml, '//ArchivedDocument/ArchivedDocumentDescription/RepresentationDescription/DocumentPartDescription/@fileName');
For the extraction of the binary data i use the following command:
v_clob := apex_web_service.parse_xml_clob(v_xml, '//ArchivedDocument/DocumentPart/Data/BinaryData/text()');
My problem is the performance of this extraction. Here i created some summary of the start and end time for the commands:
Start Time
End Time
Difference
Command
10.09.13 - 15:46:11,402668000
10.09.13 - 15:47:21,407895000
00:01:10,005227
v_filename_bcm := apex_web_service.parse_xml(v_xml, '//ArchivedDocument/ArchivedDocumentDescription/RepresentationDescription/DocumentPartDescription/@fileName');
10.09.13 - 15:47:21,407895000
10.09.13 - 15:47:22,336786000
00:00:00,928891
v_clob := apex_web_service.parse_xml_clob(v_xml, '//ArchivedDocument/DocumentPart/Data/BinaryData/text()');
As you can see the extraction of the filename is slower then the document extraction. For the Extraction of the filename i need ~01
I wonder about it and started some tests.
I tried to use an exact - non dynamic - filename. So i have this commands:
v_filename := '20mb_1.test';
v_clob := apex_web_service.parse_xml_clob(v_xml, '//ArchivedDocument/DocumentPart/Data/BinaryData/text()');
Under this Conditions the time for the document extraction soar. You can see this in the following table:
Start Time
End Time
Difference
Command
10.09.13 - 16:02:33,212035000
10.09.13 - 16:02:33,212542000
00:00:00,000507
v_filename_bcm := '20mb_1.test';
10.09.13 - 16:02:33,212542000
10.09.13 - 16:03:40,342396000
00:01:07,129854
v_clob := apex_web_service.parse_xml_clob(v_xml, '//ArchivedDocument/DocumentPart/Data/BinaryData/text()');
So i'm looking for a faster extraction out of the xml file. Do you have any ideas? If you need more informations, please ask me.
Thank you,
Matthias
PS: I use the Oracle 11.2.0.2.0

Although using an XML schema is a good advice for an XML-centric application, I think it's a little overkill in this situation.
Here are two approaches you can test :
Using the DOM interface over your XMLType variable, for example :
DECLARE
v_xml    xmltype := xmltype('<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
       <soap:Body>
          <ns2:GetDocumentByIDResponse xmlns:ns2="***">
             <ArchivedDocument>
                <ArchivedDocumentDescription version="1" currentVersion="true" documentClassName="Allgemeines Dokument" csbDocumentID="***">
                   <Metadata archiveDate="2013-08-01+02:00" documentID="123">
                      <Descriptor type="Integer" name="fachlicheId">
                         <Value>123</Value>
                      </Descriptor>
                      <Descriptor type="String" name="user">
                         <Value>***</Value>
                      </Descriptor>
                      <InternalDescriptor type="Date" ID="DocumentDate">
                         <Value>2013-08-01+02:00</Value>
                      </InternalDescriptor>
                      
                   </Metadata>
                   <RepresentationDescription default="true" description="Description" documentPartCount="1" mimeType="application/octet-stream">
                      <DocumentPartDescription fileName="20mb.test" mimeType="application/octet-stream" length="20971520 " documentPartNumber="0" hashValue=""/>
                   </RepresentationDescription>
                </ArchivedDocumentDescription>
                <DocumentPart mimeType="application/octet-stream" length="20971520 " documentPartNumber="0" representationNumber="0">
                   <Data fileName="20mb.test">
                      <BinaryData>
                        ABC123
                      </BinaryData>
                   </Data>
                </DocumentPart>
             </ArchivedDocument>
          </ns2:GetDocumentByIDResponse>
       </soap:Body>
    </soap:Envelope>');
domDoc    dbms_xmldom.DOMDocument;
docNode   dbms_xmldom.DOMNode;
node      dbms_xmldom.DOMNode;
nsmap     varchar2(2000) := 'xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns2="***"';
xpath_pfx varchar2(2000) := '/soap:Envelope/soap:Body/ns2:GetDocumentByIDResponse/';
istream   sys.utl_characterinputstream;
buf       varchar2(32767);
numRead   pls_integer := 1;
filename       varchar2(30);
base64clob     clob;
BEGIN
domDoc := dbms_xmldom.newDOMDocument(v_xml);
docNode := dbms_xmldom.makeNode(domdoc);
filename := dbms_xslprocessor.valueOf(
                docNode
              , xpath_pfx || 'ArchivedDocument/ArchivedDocumentDescription/RepresentationDescription/DocumentPartDescription/@fileName'
              , nsmap
node := dbms_xslprocessor.selectSingleNode(
            docNode
          , xpath_pfx || 'ArchivedDocument/DocumentPart/Data/BinaryData/text()'
          , nsmap
--create an input stream to read the node content :
istream := dbms_xmldom.getNodeValueAsCharacterStream(node);
dbms_lob.createtemporary(base64clob, false);
-- read the content in 32k chunk and append data to the CLOB :
loop
    istream.read(buf, numRead);
    exit when numRead = 0;
    dbms_lob.writeappend(base64clob, numRead, buf);
end loop;
-- free resources :
istream.close();
dbms_xmldom.freeDocument(domDoc);
END;
Using a temporary XMLType storage (binary XML) :
create table tmp_xml of xmltype
xmltype store as securefile binary xml;
insert into tmp_xml values( v_xml );
select x.*
from tmp_xml t
   , xmltable(
       xmlnamespaces(
         'http://schemas.xmlsoap.org/soap/envelope/' as "soap"
       , '***' as "ns2"
     , '/soap:Envelope/soap:Body/ns2:GetDocumentByIDResponse/ArchivedDocument/DocumentPart/Data'
       passing t.object_value
       columns filename    varchar2(30) path '@fileName'
             , base64clob clob         path 'BinaryData'
     ) x

Replication of Berkeley DB Xml Edition with the help of JAVA API

hi,
i am trying to replicate berkeley DB to 2 other replicas.with the help of small program which along with its documentation(of chapter 3). And i'm using java API for the same(specifically replication framework program.)
All necessary files are get created at host side like log files, dll files, db files. But at replica(client) side nothing get created. Host and clients are placed in the same network.
But unfortunately its not working. don't know the reason. And its not giving any sort of error. And i dont know how to go ahead. Or is there any other way should i proceed with.
So could you help me out to get rid of this problem.
Thanks

What compiler are you running?
See this message and thread:
Re: Problem after update to 2.3.8
It may be necessary to apply the -fno-strict-aliasing flag to the Berkeley DB Java library as well.
Regards,
George

Problems with PL/SQL Calling Java Function that returns String []

Hi,
I have written the following code. It's not compiling OK.
DECLARE
TYPE Tokens_Type IS VARYING ARRAY(20) OF VARCHAR2(20);
s1 Tokens_Type DEFAULT NULL;
SQL_STR VARCHAR2(2000) DEFAULT NULL;
BEGIN
SQL_STR := 'CREATE OR REPLACE FUNCTION Schema1.SPLIT_STR (S2 VARCHAR2(20)) ' ||
'RETURN s1 ' ||
'AS LANGUAGE JAVA ' ||
'NAME ''String_Mani.split_it (String) return java.lang.String []''';
EXECUTE IMMEDIATE SQL_STR;
END;
What's the problem with this?

You cannot create a function with a locally defined return type. As soon as this script is executed, Oracle no longer knows what the TOKEN_TYPE type is any more, so the function will be invalid.
You need to use a collection type defined at the database level or defined in a package - somewhere where it will persist.

Creation of xml dom

hi
i want to create xml dom in pl/sql . can i use dbms_xmlgen to create it?
i have done using dbms_xmldom but in my work environment i cant use tht package.
regards

hi
i want to create xml dom in pl/sql . can i use dbms_xmlgen to create it?
i have done using dbms_xmldom but in my work environment i cant use tht package.
regards

Which way to go with PL/SQL and XML

Hi fellows,
I have a general question to XML on Oracle.
I read already some parts of the three manuals coming with the online documentation of 9i
- XML developer kit XDK
- XML API - XDK and Oracle XML DB
- XML database developer guide Oracle XML DB.
Also I wrote already a PL/SQL package using DBMS_XMLGEN to generate XML data from relational Oracle tables.
Actually I like the simplicity how I can create XML data with this DBMS package but I still missing the features like using a DTD/XML Schema to generate XML data.
I still don't know what the best way would be to use these features of XML in Oracle.
Hopefully someone can give me some advise and possibly can point to some code samples so that I can see the proper use of the package.
How about DBMS_XMLQuery?
To use this package, would that be the better solution for my problem?
Any comment much appreciated.
Thanks
Fred

Hi Fred,
Having written a fair amount of PL/SQL code to generate and process XML in the past years, I can give you my opinion on the matter. If you look at the PL/SQL API's Oracle has been written to handle XML, you will find two types/categories of API's: PL/SQL code based on wrapping java (i.e. DBMS_XMLQUERY) and PL/SQL code based on C (i.e. DBMS_XMLGEN). The first category is usually slower, so I tend to use these only if there are no other options. You can measure execution times by executing the same query using both DBMS_XMLGEN. vs. DBMS_XMLQUERY.
I usually tend to store xml into relational tables by extracting the xml document in PL/SQL using the functions XMLType data type offers (i.e. extract, existNode, getStringVal, etc) function rather than using DBMS_XMLSTORE for flexibility reason (more control over what's being stored).
Besides the PL/SQL API's there are some rather neat SQL functions to handle XML (i.e. XMLElement, XMLForest, XMLAgg, XMLAttribute, etc) I like to use to build XML documents that are to complex for DBMS_XMLGEN. But, on the downside, I think these functions might cost considerable amounts of CPU, because behind the scene a DOM-tree is build in the SGA/UGA(?), especially on large XML structures or high concurrency systems. I have not measured this yet, so I say might.
Further, what I think is lacking from the Oracle API's in general is handing of CDATA sections and the fact that some XML functions default generate "pretty-printing" XML, which can not be switched of as far as I know. In my opinion XML should never be "pretty printed", because XML basically is about data transportation, not about lay-out. CDATA sections are not handled, even worse "<![CDATA[ ]]>" is being escaped (to &lt and &gt) and not properly interpreted when processed back to text.

How to generate XML from relational data : PL/SQL or Java

I'm new to Oracle XML and would appreciate some advice. I've been asked to generate XML documents from data stored in relational tables. The XML documents must be validated against a DTD. We will probably want to store the XML in the database.
I've seen a PL/SQL based approach as follows :
1.Mimic the structure of the DTD using SQL object types 2.Assign the relational data to the object type using PL/SQL as required
3.Use the SYS_XMLGEN package to render the required XML documents from the SQL objects
However, creating the object types seems to be quite time consuming (step 1 above) for anything other than the simplest of XML documents.
I've also seen that there is the Java based approach, namely :
1. Use the XML generator to build Java classes based on a DTD.
2. Use these classes to build the required XML
On the face of it, the Java based approach seems simpler. However, I'm not that familiar with Java.
Which is the best way to proceed ? Is the PL/SQL based approach worth pursuing or should I bite the bullet and brush up my Java ?
Is it possible to use a combination of PL/SQL and Java to populate the dtd generated java classes (step 2 of the Java approach) to reduce my learning curve ?
Thanks in advance

To help answer your questions:
1) Now, in 9iR2, you can use SQL/XML as another choice.
2) You can also use XSU to generate the XML and use XSLT to transform it to a desired format instead of using object views if possible.
3) XDK provide Class generator support to populate XML data to Java classes.

XML validation with DTD in java 1.5 not supporting

Hi,
I am facing a problem regarding validation of xml file with DTD tag in it.
I have disabled the parser through setValidating(false) method.
xml file is not parsed in JRE 1.5.but it is parsed in JRE 1.6.
Why this is showing such a behavior?
I have used xerces 2.9.0,xml-api.jar and other jar regarding XML api but still it is giving error.
please help me.
please provide a jar file name or its issue resolution in jre 1.5 or 1.4.

thanks for your prompt reply.
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Exception in thread "main" java.lang.AbstractMethodError: javax.xml.parsers.DocumentBuilderFactory.setFeature(Ljava/lang/String;Z)V
I just want to disable the parsing in jdk version 1.5 or 1.4
thanks in advance
anand

How to develope a XML-RPC client with PL/SQL

Anyone know how to develop a XML-RPC client with PL/SQL?
I've oracle 8i.
Have you some example of code?
Thanks
Paolo

So, you actually want to create the physical directory using JAVA?
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http://www.oracle-base.com/articles/8i/shell-commands-from-plsql.php

How to use java to create an XML document from an SQL database?

Hi,
I'm a complete novice at XML and have only recently started programming in Java.
I'm currently trying to develop a package in Java 1.1.8 which requires a set of very specifically formatted XML documents. These documents would need to be updated regularly by people with no knowledge of Java and I would like to make it as simple as possible.
Since the data will already be in an SQL database, I thought it might be possible to generate the XML documents from the data using a small Java application, but I'm not too sure how to go about this or if this is even possible! Any help or pointers in the right direction would be very much appreciated.
Louise

Do you have the option of upgrading to a newer version of the JDK?
JAXB does what you are wanting very easily. Also there are tools if you don't want to write your own. JAXB is available as early release on Sun's site as is the newest JDK. Otherwise, you have to design a factory and interface that will do this for you (which is what JAXB basically is in a very simplified view).

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Im going through the DOM tutorial portion on displaying a DOM with a JTree and have a few questions
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/JAXPDOM4.html
lets say i have the following simple XML :
<?xml version="1.0"?>
<circle>
<radius>15</radius>
<position>
<x-coordinate>30</x-coordinate>
<y-coordinate>50</y-coordinate>
</position>
</circle>why do i get a 3 text nodes in the resulting JTree, not counting the text that are children of <radius>, <x-coordinate> and <y-coordinate> elements ?

Is this true ? How can i avoid displaying empty text nodes ?
The empty text elements are included because by default, DocumentBuilder creates a DOM that includes all the lexical information necessary to reconstruct the original document, in it's original form. That includes comment nodes as well as text nodes. There is as yet no standard mechanism for eliminating such lexical information in the DOM so you are left with the logical structure.

Create document with PL/SQL xml parser

Hello,
I'm trying to create a document with PL/SQL package xmldom on 8.1.7 and write to a file.
The problem is that my file is empty when it's created.
Can anyone send me an example of this simple problem or fullfill my example so it's works.
As you understand I'm new in using XML. :)
My example is:
declare
doc xmldom.DOMDocument;
n xmldom.DOMNode;
e xmldom.domelement;
t xmldom.domtext;
begin
doc := xmldom.newdomdocument;
t := xmldom.createtextnode(doc, 'ROOT');
n := xmldom.makenode(t);
doc := xmldom.makedocument(n);
xmldom.writetofile(doc, 'd:\orant\xdk\plsql\demo\test.xml');
end;
Regards
Hekan

Your problem may be memory for the JavaVM. Remember, the PL/SQL
parser uses the Java XML Parser APIs which run in a VM instance.
Are you running Oracle 8i? If you are you can access our Java
XML parser loaded in 8i's VM directly from your PL/SQL code.
That is in fact how our PL/SQL Parser does it.
Finally, we have no experience loading other XML Parsers into
Oracle.
Oracle XML Team
http://technet.oracle.com
Oracle Technology Network
Premal Mehta (guest) wrote:
: Hi,
: I asked about his a few days back. Pl/SQL parser does not
work
: for XML files of size greater then 500Kb. You replied saying
: that there were no such problem.
: However whenever I try, either I get some exception or
Pl/SQL
: crashes due to memory error. I am clueless. Is there some
: setting that I can do to get away with the problem? Please
: guide...
: Also, tell me about the alternatives.
: Can I write code in Java and load these class filesin Oracle
: and then reference these classes from Pl/SQL code. Can I load
: any other parser for Java in Oracle.
: Looking forward for help...
: Premal.
null

Xml dom with pl/sql or java

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