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java xml question ...!!
Hi,
this is the problem ----
i have a huge XML file, like
<?xml version="1.0" ?>
<root>
<uniqueRoleList>
<uniqueRole>Role 1</uniqueRole>
<uniqueRole>Role 2</uniqueRole>
</uniqueRoleList>
<Person name="andrew singh">
<FullName>Andrew Kustarnikov</FullName>
<Assignments>
<Role>Role 1</Role>
<Group>Group 1</Group>
<GroupRole>Manger</GroupRo
</Assignments>
</Person>
<Person name="Babu">
<FullName>Babu James</FullName>
<Assignments>
<Role>Role 1</Role>
<Group>Group 2</Group>
<GroupRole>System Manger</GroupRole>
</Assignments>
</Person>
.
.
.
.
.
.
</root>
Where in i have first roles and then list of all users.., at many point of time in the application i have to show the list of all users. The number of persons(registered) are expected to be around 4000-5000, i am not sure how to manage this data. I will have to cache it but what am not sure what is the best way to do it.
In a nutshell these are the issues i need a solution for
1. Best way cache such xmls which rarely changes
2. Best way to parse this type of xml
3. How to query such xml data objects
Please advise.
thanks
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Answers
Xerces is a better choice than Xalan, as Apache will be abondoning Xalan, but continuing with Xerces.
If the file is large, I would use SAX and write the data to a database. Access the database for future queries. If you cach the XML as DOM Document, you will use a lot of memory that you don't have to.
DOM is better than SAX if you need to modify the XML, but SAX id more efficient and doesn't load the whole file into memory.
i am already using xerces and storing it in a dom object, but infact to want to use my own class that store the data for me, so that it is light on memory. Now from this class i query and get the result. But i am confused in the initial parsing..should i do it in sax or dom(then delte teh dom object)
If you are storing all the data in a large XML file it will not be light on memory. All you will save is the overhead of the tags, but since the JVM shared strings, you will only be saving one string per XML nodename.
If memory is an issue, you really should persist the data.
Your best bet sounds like is to use SAX as it reads your file line by line. You can then place the data wherever you choose.
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
- split points between umargul and m_onkey_boy
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by: umargulPosted on 2002-02-06 at 07:02:33ID: 6782657
For that u have to use a xml parser and some Api's will be lot helpful. U will find JAXP in java.sun.com/xml. And also SAX will be helpful. Visit the link
www.megginson.com/SAX/sax.