Querying large XML files with WEBSERVICE()

I am trying to use the function WEBSERVICE to query large chucks of data, without success
Let's go with an example :
=SERVICEWEB(http://api.eve-central.com/api/marketstat?&regionlimit=10000002&typeid=2305"))
This line works, and give me the following result :
<?xml version='1.0' encoding='utf-8'?>
<evec_api version="2.0" method="marketstat_xml">
      <marketstat><type id="2305">
          <buy><volume>125924386</volume><avg>2.09</avg><max>2.39</max><min>1.00</min><stddev>0.36</stddev><median>2.20</median><percentile>2.37</percentile></buy>
          <sell><volume>384731177</volume><avg>11.87</avg><max>30.01</max><min>3.40</min><stddev>8.34</stddev><median>3.82</median><percentile>3.80</percentile></sell>
          <all><volume>431842145</volume><avg>5.63</avg><max>20.01</max><min>0.57</min><stddev>3.92</stddev><median>3.83</median><percentile>1.57</percentile></all>
        </type></marketstat>
    </evec_api>
This is exactly the same content as the webpage from the url used (http://api.eve-central.com/api/marketstat?&regionlimit=10000002&typeid=2305)
In my case, I am working with several typeid and I would like to send the server only one query instead of N queries (where N is the number of typeid I use)
I am want to use this query :
http://api.eve-central.com/api/marketstat?&regionlimit=10000002&typeid=2073&typeid=2288&typeid=2286&typeid=2306&typeid=2309&typeid=2305&typeid=2311&typeid=2310&typeid=2308&typeid=2270&typeid=2287&typeid=2267&typeid=2307&typeid=2272&typeid=2268&typeid=2393&typeid=2396&typeid=3779&typeid=2401&typeid=2390&typeid=2397&typeid=2392&typeid=3683&typeid=2389&typeid=2399&typeid=2395&typeid=2398&typeid=9828&typeid=2400&typeid=3645&typeid=2329&typeid=3828&typeid=9836&typeid=9832&typeid=44&typeid=3693&typeid=15317&typeid=3725&typeid=3689&typeid=2327&typeid=9842&typeid=2463&typeid=2317&typeid=2321&typeid=3695&typeid=9830&typeid=3697&typeid=9838&typeid=2312&typeid=3691&typeid=2319&typeid=9840&typeid=3775&typeid=2328&typeid=2358&typeid=2345&typeid=2344&typeid=2367&typeid=17392&typeid=2348&typeid=9834&typeid=2366&typeid=2361&typeid=17898&typeid=2360&typeid=2354&typeid=2352&typeid=9846&typeid=9848&typeid=2351&typeid=2349&typeid=2346&typeid=12836&typeid=17136&typeid=28974&typeid=2375&typeid=2868&typeid=2869&typeid=2870&typeid=2871&typeid=2872&typeid=2875&typeid=2876
When you go on
the webpage you can see that all results are there. However I am getting in excel :
#VALUE!
I think Excel is not waiting enough to get all the data, deciding there is no answer and telling me "no correct values".
How could I make this work within one request ?
Thank you for any input
Hello everyone,
I am trying to use the function WEBSERVICE to query large chucks of data, without success
Let's go with an example :
=SERVICEWEB(http://api.eve-central.com/api/marketstat?&regionlimit=10000002&typeid=2305"))
This line works, and give me the following result :
<?xml version='1.0' encoding='utf-8'?>
<evec_api version="2.0" method="marketstat_xml">
      <marketstat><type id="2305">
          <buy><volume>125924386</volume><avg>2.09</avg><max>2.39</max><min>1.00</min><stddev>0.36</stddev><median>2.20</median><percentile>2.37</percentile></buy>
          <sell><volume>384731177</volume><avg>11.87</avg><max>30.01</max><min>3.40</min><stddev>8.34</stddev><median>3.82</median><percentile>3.80</percentile></sell>
          <all><volume>431842145</volume><avg>5.63</avg><max>20.01</max><min>0.57</min><stddev>3.92</stddev><median>3.83</median><percentile>1.57</percentile></all>
        </type></marketstat>
    </evec_api>
This is exactly the same content as the webpage from the url used (http://api.eve-central.com/api/marketstat?&regionlimit=10000002&typeid=2305)
In my case, I am working with several typeid and I would like to send the server only one query instead of N queries (where N is the number of typeid I use)
I am want to use this query :
http://api.eve-central.com/api/marketstat?&regionlimit=10000002&typeid=2073&typeid=2288&typeid=2286&typeid=2306&typeid=2309&typeid=2305&typeid=2311&typeid=2310&typeid=2308&typeid=2270&typeid=2287&typeid=2267&typeid=2307&typeid=2272&typeid=2268&typeid=2393&typeid=2396&typeid=3779&typeid=2401&typeid=2390&typeid=2397&typeid=2392&typeid=3683&typeid=2389&typeid=2399&typeid=2395&typeid=2398&typeid=9828&typeid=2400&typeid=3645&typeid=2329&typeid=3828&typeid=9836&typeid=9832&typeid=44&typeid=3693&typeid=15317&typeid=3725&typeid=3689&typeid=2327&typeid=9842&typeid=2463&typeid=2317&typeid=2321&typeid=3695&typeid=9830&typeid=3697&typeid=9838&typeid=2312&typeid=3691&typeid=2319&typeid=9840&typeid=3775&typeid=2328&typeid=2358&typeid=2345&typeid=2344&typeid=2367&typeid=17392&typeid=2348&typeid=9834&typeid=2366&typeid=2361&typeid=17898&typeid=2360&typeid=2354&typeid=2352&typeid=9846&typeid=9848&typeid=2351&typeid=2349&typeid=2346&typeid=12836&typeid=17136&typeid=28974&typeid=2375&typeid=2868&typeid=2869&typeid=2870&typeid=2871&typeid=2872&typeid=2875&typeid=2876
When you go on
the webpage you can see that all results are there. However I am getting in excel :
#VALUE!
I think Excel is not waiting enough to get all the data, deciding there is no answer and telling me "no correct values".
How could I make this work within one request ?
Thank you for any input
=SERVICEWEB(http://api.eve-central.com/api/marketstat?&regionlimit=10000002&typeid=2305"))
=SERVICEWEB(http://api.eve-central.com/api/marketstat?&regionlimit=10000002&typeid=2305"))
This is exactly the same content as the webpage from the url used (http://api.eve-central.com/api/marketstat?&regionlimit=10000002&typeid=2305)
In my case, I am working with several typeid and I would like to send the server only one query instead of N queries (where N is the number of typeid I use)
I am want to use this query :

What is your machine configuration ?
The above 2 suggestions would help, but it does depend on how your software is written.
Please post more info about your environment and object design.
Chintan

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OSB - Iterating over large XML files with content streaming

Hi @ll
I have to iterate over all item in large XML files and insert into a oracle database.
The file is about 200 MB and contains around 500'000, and I am using OSB 10gR3.
The XML structure is something like this:
<allItems>
<item>.....</item>
<item>.....</item>
<item>.....</item>
<item>.....</item>
<item>.....</item>
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Actually I thought about using a proxy service with enabled content streaming and a "for each" action for iterating
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More about streaming large files can be found here:
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Edited by: user10095731 on 29.07.2009 06:41

Hi Dani,
Yes, according to me this would be the best approach. You can use content-streaming to pass this large xml to ejb and once it passes successfully EJB should operate on this. If you want any result back (for further routing), you can get it back from EJB.
EJB gives you power of java to process this file and from java perspective 150 MB is not a very LARGE data. Ensure that you are using buffering. Check out this link for an explanation on Java IO Streams and, in particular, buffered streams -
http://java.sun.com/developer/technicalArticles/Streams/ProgIOStreams/
Try dom4J with xpp (XML Pull Parser) parser in case you have parsing requirement. We had worked with 1.2GB file using this technique.
Regards,
Anuj

Transform Large XML files with XSL

HELP, LARGE XML FILES
I have got 30 - 50 MB large xml file, and i would like to transform it
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I tried really everything.
Thanks a lot

What is your machine configuration ?
The above 2 suggestions would help, but it does depend on how your software is written.
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Java.lang.StackOverflowError in geting large xml file with RMI

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so many these lines
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Hi yue42, thanks alot for your rely.
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="html"/>
<xsl:include href="global.xsl"/>
<xsl:template match="/">
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<head>News</head>
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<table>
<xsl:for-each select="//NEWS/STORY">
<xsl:if test="6>position()">
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Transfer 100M XML file with XSL

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I am trying to transfer 100M XML file with XSL. Input.xml is the XML file, format.xsl is the XSL file. I type in the command line as:
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maybe?
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http://java.sun.com/j2se/1.3/docs/tooldocs/win32/java-classic.html

Query in a large xml file

Hello,
I'm trying to work with very large xml files which are created from csv files. These files may be very large - up to 1 GB ! Untill now I have managed to do several validations on these big xml files, and the only thing that works for me is SAX parser, DOM is out of the question because it fills up memory.
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select field1,field2 from file.xml
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and (fileld4>'B' or field1='C')
order by field2.
I searched the net about finding out how to make queries on xml files (since I have never done queries on xml before), but I couldn't find which "query language" is best for large files. If I use XPath (XSLT) will that not cause me memory problems because XSLT represents the file as a memory object?
My idea is to parse the file with SAX and check every row if it fits the where condition and then write it immediately to a result xml file. But validating the where statement can be very complicated without using some tool. Also the order by statement is another problematic issue.
Does anyone have some more intelegent ideas about how I can do this? Please help! :(
The xml file looks like this:
<doc>
<row id ="1">
<column id="1" name="column1">value</column>
<column id="N" name="columnN">value</column>
</row>
<row id ="M">
<column id="1" name="column1">value</column>
<column id="N" name="columnN">value</column>
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Hi all,
Thank you very much for your replies.
First, saxon didn't work because it uses an in-memory parser, and that is what I was trying to avoid.
Different database is also out of the question, because the customer insist on XML, and also there are some files that can never be converted to a database table, because eventually with some transformations thay are changed and are not completely like the standard csv format.
I think that maybe http://exist.sourceforge.net is the rigth solution for me, but I will probably try it in the next version of my project.
For now I have managed to make the project with only SAXParser and a lot of back - end programming and it works ok, althoug it was very hard to make it, and will be harded to maintain, so I will try to look at the eXist project.
Thanks everyone for the help.

Does the parser work with large XML files?

Is there a restriction on the XML file size that can be loaded into the parser?
I am getting a out of memory exception reading in large XML file(10MB) using the commands
DOMParser parser = new DOMParser();
URL url = createURL(argv[0]);
parser.setErrorStream(System.err);
parser.setValidationMode(true);
parser.showWarnings(true);
parser.parse(url);
Win NT 4.0 Server
Sun JDK 1.2.2
===================================
Error output
===================================
Exception in thread "main" java.lang.OutOfMemoryError
at oracle.xml.parser.v2.ElementDecl.getAttrDecls(ElementDecl.java, Compi
led Code)
at java.util.Hashtable.<init>(Unknown Source)
at oracle.xml.parser.v2.DTDDecl.<init>(DTDDecl.java, Compiled Code)
at oracle.xml.parser.v2.ElementDecl.getAttrDecls(ElementDecl.java, Compi
led Code)
at oracle.xml.parser.v2.ValidatingParser.checkDefaultAttributes(Validati
ngParser.java, Compiled Code)
at oracle.xml.parser.v2.NonValidatingParser.parseAttributes(NonValidatin
gParser.java, Compiled Code)
at oracle.xml.parser.v2.NonValidatingParser.parseElement(NonValidatingPa
rser.java, Compiled Code)
at oracle.xml.parser.v2.ValidatingParser.parseRootElement(ValidatingPars
er.java:97)
at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingP
arser.java:199)
at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:146)
at TestLF.main(TestLF.java:40)
null

We have a number of test files that are that size and it works without a problem. However using the DOMParser does require significantly more memory than your doc size.
What is the memory configuration of the JVM that you are running with? Have you tried increasing it? Are you using our latest version 2.0.2.6?
Oracle XML Team

Problem with parsing large xml files

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I am parsing a large xml file of 20MB and I use DocumentBuilder.parse(File). This method works for small xml files with size less than 20MB but the application hangs and doesn't through any error message when parsing 20MB xml files. Please let me know what I have to do at this point ?
Thanks & Regards,
Kumar.

Well... i can't agree.
If you have such structure:
<task>
<task/>
<task>
     <task>
        <task/>
     </task>
     <task/>
</task>
</task>
...you may always keep stack of tasks (at startElement push to top, and at endElement pop), so at every leaf of tree you will have all parents of that leaf.
for such structure:
<task id="1" parent="0"/>
<task id="2" parent="1"/>
<task id="3" parent="1"/>
<task id="4" parent="2"/>
<task id="5" parent="3"/>
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Problem with parsing large XML files chunked over HTTP

I'm trying to isolate a bug that was introduced when upgrading the JRE in use from Java 7u51 to 7u71 without changing any code. The problem appears to be very similar to: Bug ID: JDK-8027359 XML parser returns incorrect parsing results.
Further investigation showed that it was also introduced in the same versions (7u71) where that fix was applied. Unlike that bug though, my XML is marked as version 1.0. It also appears to be with only large XML files, on the order of 10MB or so.
The closest I've been able to narrow it down to is the code is using JAXB to unmarshall a stream that the debugger tells me is a org.apache.http.com.EofSensorInputStream / org.apache.http.impl.io.ChunkedInputStream. The exception I get is not consistent, but typically appears to be from chunks being overwritten or shuffled, resulting in letters appearing in attributes that are actually numbers, or like the following where an attribute "testAttribute" gets partially overwritten by the end of a timestamp that was in a different section of the XML.
javax.xml.bind.UnmarshalException
- with linked exception:
[javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,98748]
Message: Attribute name "testAttribu00Z" associated with an element type "testElement" must be followed by the ' = ' character.]
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.handleStreamException(UnmarshallerImpl.java:421)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:357)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:334)
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,98748]
Message: Attribute name "testAttribu00Z" associated with an element type "testElement" must be followed by the ' = ' character.
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(XMLStreamReaderImpl.java:598)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.StAXStreamConnector.bridge(StAXStreamConnector.java:181)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:355)
... 6 more
Here's some code that seems to reproduce it if you can connect to an XML server that returns a large chunked XML file:
SchemeRegistry registry = new SchemeRegistry();
registry.register(
new Scheme("http", 80, PlainSocketFactory.getSocketFactory()));
HttpClient client = new DefaultHttpClient(new BasicClientConnectionManager(registry));
String url = "http://someUrlReturningAlargeChunkedXML";
HttpGet method = new HttpGet(url);
HttpResponse response = client.execute(method);
InputStream inputStream = response.getEntity().getContent();
XMLStreamReader responseReader = factory.createXMLStreamReader(inputStream);
JAXBElement<JaxBObjectOfResponse> wot = unmarshaller.unmarshal(responseReader, JaxBObjectOfResponse.class);
If you connect using URL.openStream() to the same service there is no error. If I read bytes directly and write to a file, there is no error. The error only happens when I try to unmarshal it, and it's large, and I'm using Java 7u71 (or later). It can be consistently repeated with the jsp webapp that I'm using, but didn't show the error when I used the same code with a Wikipedia dump XML file.
How can I unmarshal in a different way to avoid this problem? Or, how can I better isolate the bug so it can be posted to the appropriate bug system?

Apparently, adding the Woodstox XML libraries avoids the bug. Is there anyone who can reproduce this on another system? Was there any changes to the Stax implementation between u67 and u71 that may have introduced a bug like this?
Edit: When setting the logging level to DEBUG, I once saw the overwritten buffer being logged as if that was what was received (as in the testAttribu00Z example above). I can't repeat that anymore though, and very rarely it does parses with no exception (though it may have still been corrupted). Now the error seems to be consistently on one of the buffer boundaries, as in:
17:08:09,705 DEBUG wire:63 - << "2000[\r][\n]"
17:08:09,705 DEBUG wire:77 - << "trend>....OTHER XML...<trend hours=""
17:08:09,705 DEBUG wire:77 - << "634.0972777777778" datetime="2013-05-21T00:43:48.350Z" t"
17:08:09,705 DEBUG wire:63 - << "[\r][\n]"
17:08:09,705 DEBUG wire:63 - << "2000[\r][\n]"
17:08:09,705 DEBUG wire:77 - << "rend-mode="0">
Exception in thread "main" java.lang.NumberFormatException: t34.0972777777778
at com.sun.xml.internal.bind.DatatypeConverterImpl._parseDouble(DatatypeConverterImpl.java:213)
at mypackage.Trend_JaxbXducedAccessor_hours.parse(TransducedAccessor_field_Double.java:48)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.StructureLoader.startElement(StructureLoader.java:194)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:486)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:465)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.InterningXmlVisitor.startElement(InterningXmlVisitor.java:60)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.StAXStreamConnector.handleStartElement(StAXStreamConnector.java:231)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.StAXStreamConnector.bridge(StAXStreamConnector.java:165)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:355)
at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:334)
Or:
17:19:12,563 DEBUG wire:63 - << "2000[\r][\n]"
17:19:12,563 DEBUG wire:77 - << ...OTHER XML...<trend index="5"
17:19:12,563 DEBUG wire:77 - << "" label="N"
17:19:12,563 DEBUG wire:63 - << "[\r][\n]"
Exception in thread "main" java.lang.NumberFormatException: Not a number: N
at com.sun.xml.internal.bind.DatatypeConverterImpl._parseInt(DatatypeConverterImpl.java:106)
at com.sun.xml.internal.bind.DatatypeConverterImpl._parseShort(DatatypeConverterImpl.java:118)

Problems with Large XML files

I have tried increasing the memory pool using the -mx and -ms options. It doesnt work. I am using your latest XML parser for Java v2. Please let me know if there are some specific options I should be using.
Thanx,
-Sameer
We have a number of test files that are that size and it works without a problem. However using the DOMParser does require significantly more memory than your doc size.
What is the memory configuration of the JVM that you are running with? Have you tried increasing it? Are you using our latest version 2.0.2.6?
Oracle XML Team
Is there a restriction on the XML file size that can be loaded into the parser?
I am getting a out of memory exception reading in large XML file(10MB) using the commands
DOMParser parser = new DOMParser();
URL url = createURL(argv[0]);
parser.setErrorStream(System.err);
parser.setValidationMode(true);
parser.showWarnings(true);
parser.parse(url);
Win NT 4.0 Server
Sun JDK 1.2.2
===================================
Error output
===================================
Exception in thread "main" java.lang.OutOfMemoryError
at oracle.xml.parser.v2.ElementDecl.getAttrDecls(ElementDecl.java, Compi
led Code)
at java.util.Hashtable.<init>(Unknown Source)
at oracle.xml.parser.v2.DTDDecl.<init>(DTDDecl.java, Compiled Code)
at oracle.xml.parser.v2.ElementDecl.getAttrDecls(ElementDecl.java, Compi
led Code)
at oracle.xml.parser.v2.ValidatingParser.checkDefaultAttributes(Validati
ngParser.java, Compiled Code)
at oracle.xml.parser.v2.NonValidatingParser.parseAttributes(NonValidatin
gParser.java, Compiled Code)
at oracle.xml.parser.v2.NonValidatingParser.parseElement(NonValidatingPa
rser.java, Compiled Code)
at oracle.xml.parser.v2.ValidatingParser.parseRootElement(ValidatingPars
er.java:97)
at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingP
arser.java:199)
at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:146)
at TestLF.main(TestLF.java:40)
null

You might try using a different JDK/JRE - either a 1.1.6+ or 1.3 version as 1.2 in our experience has the largest footprint. If this doesn't work can you give us some details about your system configuration. Finally you might try the SAX interface as it does not need to load the entire DOM tree into memory.
Oracle XML Team

Loading, processing and transforming Large XML Files

Hi all,
I realize this may have been asked before, but searching the history of the forum isn't easy, considering it's not always a safe bet which words to use on the search.
Here's the situation. We're trying to load and manipulate large XML files of up to 100MB in size.
The difference from what we have in our hands to other related issues posted is that the XML isn't big because it has a largly branched tree of data, but rather because it includes large base64-encoded files in the xml itself. The size of the 'clean' xml is relatively small (a few hundred bytes to some kilobytes).
We had to deal with transferring the xml to our application using a webservice, loading the xml to memory in order to read values from it, and now we also need to transform the xml to a different format.
We solved the webservice issue using XFire.
We solved the loading of the xml using JAXB. Nevertheless, we use string manipulations to 'cut' the xml before we load it to memory - otherwise we get OutOfMemory errors. We don't need to load the whole XML to memory, but I really hate this solution because of the 'unorthodox' manipulation of the xml (i.e. the cutting of it).
Now we need to deal with the transofmation of those XMLs, but obviously we can't cut it down this time. We have little experience writing XSL, but no experience on how to use Java to use the XSL files. We're looking for suggestions on how to do it most efficiently.
The biggest problem we encounter is the OutOfMemory errors.
So I ask several questions in one post:
1. Is there a better way to transfer the large files using a webservice?
2. Is there a better way to load and manipulate the large XML files?
3. What's the best way for us to transform those large XMLs?
4. Are we missing something in terms of memory management? Is there a better way to control it? We really are struggling there.
I assume this is an important piece of information: We currently use JDK 1.4.2, and cannot upgrade to 1.5.
Thanks for the help.

I think there may be a way to do it.
First, for low RAM needs, nothing beats SAX. as the first processor of the data. With SAX, you control the memory use since SAX only processes one "chunk" of the file at a time. You supply a class with methods named startElement, endElement, and characters. It calls the startElement method when it finds a new element. It calls the characters method when it wants to pass you some or all of the text between the start and end tags. It calls endElement to signal that passing characters is over, and to let you get ready for the next element. So, if your characters method did nothing with the base-64 data, you could see the XML go by with low memory needs.
Since we know in your case that the characters will process large chunks of data, you can expect many calls as SAX calls your code. The only workable solution is to use a StringBuffer to accumulate the data. When the endElement is called, you can decode the base-64 data and keep it somewhere. The most efficient way to do this is to have one StringBuffer for the class handling the SAX calls. Instantiate it with a big enough size to hold the largest of your binary data streams. In the startElement, you can set the length of the StringBuilder to zero and reuse it over and over.
You did not say what you wanted to do with the XML data once you have processed it. SAX is nice from a memory perspective, but it makes you do all the work of storing the data. Unless you build a structured set of classes "on the fly" nothing is kept. There is a way to pass the output of one SAX pass into a DOM processor (without the binary data, in this case) and then you would wind up with a nice tree object with the rest of your data and a group of binary data objects. I've never done the SAX/DOM combo, but it is called a SAXFilter, and you should be able to google an example.
So, the bottom line is that is is very possible to do what you want, but it will take some careful design on your part.
Dave Patterson

Generation of Xml file with java output

Hi i m new to xml and java combination. I have a name value pair kind of output returning from java program. I want to generate the new xml file with the data. Could some one help me out in generating xml file with the data. Could anyone send me the java code that does this task.

Let me know which parser are you using currently for reading xml files so that i assist you. For now, you can refer to STAX Parser API under this link
http://java.sun.com/webservices/docs/1.6/tutorial/doc/SJSXP3.html

How to set SAXParser at command-line interface to create a large XML file

Hi,
I am trying to create a large XML file (more than 50 MB) by selecting from Oracle database but failed because of "out of memory" error. According to "Oracle XML Developer Guide", we should use SAXParser to parsing a large XML file. But there is no example to show how to set SAXParser at command-line
Following is what I use to get xml files. It works only when the file is small.
java OracleXML getXML -DateFormat -withDTD -rowsetTag PO_HDR -conn
"jdbc:oracle:oci8:@server_name" -user "ID/password" "select * from table_name"
When I set SAXParser at the way below,
java oracle.xml.parser.v2.SAXParser OracleXML getXML -DateFormat -withDTD -rowsetTag PO_HDR -conn
"jdbc:oracle:oci8:@server_name" -user "ID/password" "select * from table_name"
it failed with the error message: "In class oracle.xml.parser.v2.SAXParser: void main(String argv[]) is not defined"
Does anyone know how to solve the problem? I'll be appreciated very much for your help.
Yi

here are my ideas.
register the xml schema.
using xmldom, generate the desired xml output and return as xmltype.
then you can use something like this to check.
declare
xmldoc xmltype ;
begin
   -- populate xmldoc from you xmldom function
   -- validate against XML schema
   xmldoc.isSchemaValid(schema_url, root_element);
   if xmldoc.isSchemaValid = 1 then
        --valid schema
   else
        --invalid
   end if;
end

I want to load large raw XML file in firefox and parse by DOM. But, for large XML file the firefox very slow some time crashed . Is there any option to increase DOM handling memory in Firefox

Actually i am using an off-line form to load very large XML file and using firefox to load that form. But, its taking more time to load and some time the browser crashed. through DOM parsing this XML file to my form. Is there any option to increase DOM handler size in firefox

Thank you for your suggestion. I have a question,
though. If I use a relational database and try to
access it for EACH and EVERY click the user makes,
wouldn't that take much time to populate the page with
data?
Isn't XML store more efficient here? Please reply me.You have the choice of reading a small number of records (10 children per element?) from a database, or parsing multiple megabytes. Reading 10 records from a database should take maybe 100 milliseconds (1/10 of a second). I have written a web application that reads several hundred records and returns them with acceptable response time, and I am no expert. To parse an XML file of many megabytes... you have already tried this, so you know how long it takes, right? If you haven't tried it then you should. It's possible to waste a lot of time considering alternatives -- the term is "analysis paralysis". Speculating on how fast something might be doesn't get you very far.

Loading XML file with missing elements dynamically through ODI

Hi Guys ,
I have the below xml file with two nodes Employee and Address. On a daily basis , sometimes the address element might not come in from the source xml file , but my interface has columns mapped to address elements, and hence it can fail due to the source element not being found in the file or data might not get loaded due to the 'and' condition in the sql query generated between the employee and address elements. Is there a way where i can load the data dynamically where i can search in the file only for the elements (Employee) present and load data only for those elements dynamically?
XML File:
<?xml version="1.0" encoding="UTF-8" ?>
<EMP>
<Empsch>
<Employee>
<EmployeeID>12345</EmployeeID>
<Initials>t</Initials>
<LastName>john</LastName>
<FirstName>doe</FirstName>
</Employee>
<Address>
<WorkPhone>12345</WorkPhone>
<WorkAddress>Test 234</WorkAddress>
</Address>
</Empsch>
</EMP>
Thanks ,
Revanth Tambisetty

I was able to resolve it by using left outer joins and referring the table structure from the XSD

Querying large XML files with WEBSERVICE()

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