Again: display large XML fil;e?

Dear all,
Any ideas to display large XML file into a JTree? This has been asked before, but still does not have any solution yet.
I am looking for your kind help. Please help show me some codes, if you know.
Many thanks!

Any (close) examples for it? i've not got any - sorry
btw, how large is large? does this mean you can't afford to store the whole XML in memory at the same time, or simply that the gui is unresponsive/resource hungry?
asjf

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Parsing large xml file and display using swing

Hi all,
I want to read a large xml file and display graphically in swing as a tree structure.
I implemented it and works fine for files of 5MB size after increasing the jvm heap size (-Xmx). If the file size is larger than 5MB it throws out of memory error. I'm creating a custom datastructure from the xml and I'm using sax parsing.
After displaying the datastructure, the user could do some operation on this, like search etc.
Can any of you suggest a method, to support larger files ? What I'm looking for is create the datastructure in file system, rather than in memory.
Any other tips for memory management would be greatly appreciated
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Nisha

Use a memory-mapped file?
http://javaalmanac.com/egs/java.nio/CreateMemMap.html

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I'd try to modify the autoComplete component.
You could break this processing up into smaller chunks. For
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track of where you are. Have the conversion function process say
nodes 0-500, then end. Then using callLater, call that function
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Best technology to navigate through a very large XML file in a web page

Hi!
I have a very large XML file that needs to be displayed in my web page, may be as a tree structure. Visitors should be able to go to any level depth nodes and access the children elements or text element of those nodes.
I thought about using DOM parser with Java but dropped that idea as DOM would be stored in memory and hence its space consuming. Neither SAX works for me as every time there is a click on any of the nodes, my SAX parser parses the whole document for the node and its time consuming.
Could anyone please tell me the best technology and best parser to be used for very large XML files?

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.

Reading large XML file using a file event generator and a JPD process

I am using a FileEventGenerator and a JPD Subscription process to read a large XML file. The large XML file basically contains repeated XML elements. My understanding is that the file subscription method reads the whole file in memory which causes lots of problem for huge file size like 1MB. Is there a way to read the file size-wise or is there a way to read chunks of data from a large size file..or any other alternative. I would like to process the file in a loop iteration by iteration.

Hitejain,
Here are a couple of pointers you could try. One is that the file event generator has a pass by reference (filename) functionality which you could use so that you could do the following inside of your process.
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3) Open a stream to the file.
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Stormforge Software

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i'm having an extremely large XML files, gegas, it holds some info for displaying graphical representations for users, one of which is the updated view every time instance. i'm stuck with handling this large XML file, obviously i tried using a DOM parser, i got an out of memory exception, i though of using SAX as its event based, but then i'll be stuck going backward through the representation, i need users to go backward and forward representing the graphical representation at different time instances.

It is gigabytes?
And this file gets modified by some external application(s), rather than being created one time?
And you want to keep reprocessing it at the same time other application(s) are modifying it?
If yes to all of those, then I doubt there is any real solution except to copy it. If you attempt to sync it with the file system then you are either going to be locking it, preventing updates, or you are going to end up with corrupted data and thus ill formed xml.
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Is there a way to import large XML files into HANA efficiently are their any data services provided to do this?

1. Is there a way to import large XML files into HANA efficiently?
2. Will it process it node by node or the entire file at a time?
3. Are there any data services provided to do this?
This for a project use case i also have an requirement to process bulk XML files, suggest me to accomplish this task

Hi Patrick,
I am addressing the similar issue. "Getting data from huge XMLs into Hana."
Using Odata services can we handle huge data (i.e create schema/load into Hana) On-the-fly ?
In my scenario,
I get a folder of different complex XML files which are to be loaded into Hana database.
Then I gotta transform & cleanse the data.
Can I use oData services to transform and cleanse the data ?
If so, how can I create oData services dynamically ?
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How to display an XMl file in a webydynpro Application.

Hi All,
I am working with a webdynpro application where i have an xml file. when ever i run the webdynpro application it has to display that xml file in the browser instead of view. It would be appreciable if anyone give me some idea on how to start this application
Thanks in advance
Regards
ravi

HI Ravi,
Insert a portalIFRame or IFrame with width 100%.
Create a context variable (Say xmlFile) of type String and bind to Source property of PoratlIFrame .
Put the xmlfile inside Project\src\mimes\Components\Package\
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Regards
Fahad Hamsa

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
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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"
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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
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Hi,
I'm trying to parse a large XML file(15 MB) and facing a clear performance problem. A Simple XML Validation using the following code snippet:
DBMS_LOB.fileopen(targetFile, DBMS_LOB.file_readonly);
DBMS_LOB.loadClobfromFile
tempCLOB,
targetFile,
DBMS_LOB.getLength(targetFile),
dest_offset,
src_offset,
nls_charset_id(CONSTANT_CHARSET),
lang_context,
conv_warning
DBMS_LOB.fileclose(targetFile);
p_xml_document := XMLType(tempCLOB, p_schema_url, 0, 0);
p_xml_document.schemaValidate();
is taking 30 mins on a HP-UX (4GB ram, 2 CPU) machine (Oracle version : 9.2.0.4).
Please explain what could be going wrong.
Thanks In Advance,
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Thanks Mark,
I'll open a TAR and also upload the schema and instance XML.
If i'm not changing the track too much :-) one more thing in continuation:
If i skip the Schema Validation step and directly insert the instance document into a Schema linked XMLType table, what does OracleXDB do in such a case?
i'm getting a severe performance hit here too... the same file as above takes almost 40 mins to Insert.
code snippet:
DBMS_LOB.fileopen(targetFile, DBMS_LOB.file_readonly);
DBMS_LOB.loadClobfromFile
tempCLOB,
targetFile,
DBMS_LOB.getLength(targetFile),
dest_offset,
src_offset,
nls_charset_id(CONSTANT_CHARSET),
lang_context,
conv_warning
DBMS_LOB.fileclose(targetFile);
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Here table INCOMING_XML is :
TABLE of SYS.XMLTYPE(XMLSchema "http://INCOMING_XML.xsd" Element "MatchingResponse") STORAGE Object-
relational TYPE "XDBTYPE_MATCHING_RESPONSE"
This table and type XDBTYPE_MATCHING_RESPONSE were created using the mapping provided in the registered XML Schema.
Thanks,
Vineet

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.

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>
</allItems>
Actually I thought about using a proxy service with enabled content streaming and a "for each" action for iterating
over all items. But for this the whole XML structure has to be materialized into a variable otherwise it is not possible!
More about streaming large files can be found here:
[http://download.oracle.com/docs/cd/E13159_01/osb/docs10gr3/userguide/context.html#large_messages]
There is written "When you enable streaming for large message processing, you cannot use the ... for each...".
And for accessing single items you should should use an assign action with a xpath like "$body/allItems/item[1]";
this works fine and not the whole XML stream has to be materialized.
So my idea was to use the "for each" action and processing seqeuntially all items with a xpath like:
$body/allItems/item[$counter]
But the "for each" action just allows iterating over a sequence of xml items by defining an selection xpath
and the variable that contains all items. I would like to have a "repeat until" construct that iterates as long
$body/allItems/item[$counter] returns not null. Or can I use the "for each" action differently?
Does the OSB provides any other iterating mechanism? I know there is this spli-join construct that supports
different looping techniques, but as far I know it does not support content streaming, is this correct?
Did I miss somehting?
Thanks a lot for helping!
Cheers
Dani
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

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.
My next task is to do queries on these files, smth like:
select field1,field2 from file.xml
where field3 = 'A'
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>
</row>
</doc>

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.

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Transform Large XML files with XSL

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What is your machine configuration ?
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Again: display large XML fil;e?

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