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XML database in disk file

Posted on 2004-03-22
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Last Modified: 2010-05-18
Hi
i proposed to the client that we should not use the database like Access for out project. As in our application we have only one table i proposed to use a XML file.

Application will be developed in VB6.

Now what i want is that i want to use the DOM.  Problem is DOM reads the whole file in memory.  I do not want to read the whole XML file in memory instead i give a XPATH Query and DOM loads only selected nodes from disk to memory. Then i want to do operation like add a new record, modify and delete record and still i do not want to load the entire XML file in memory.

Here is what should be the XML database file format

<Database>
<Table Name = " ">
     <Record ID="1">
             <field1 value="">
             <field2 value="">
             <field3 value="">
      </Record>

     <Record ID="2">
             <field1 value="">
             <field2 value="">
             <field3 value="">
      </Record>

     <Record ID="3">                    i want only one record
             <field1 value="">            to be load in DOM
             <field2 value="">
             <field3 value="">            also i want to modify
      </Record>                             this record in the file

                                                  I ALso want to delete
                                                  this record from XML
                                                                                    ----------and so on-------------
</Table>

-----More tables in future here----------------
</Database>

I think file will grow 200K each month by added new records. So loading the entire file in memory will not be acceptable solution after say 1 year.

I will also conside if there is a samll XML database available on the internet. PLease suggest free tool

Thanks
Shahzad
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Question by:shahzad73
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3 Comments
 
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DanRollins earned 125 total points
ID: 10653990
I don't think you can use XPATH to pull just specific nodes without loading the XML into memory.

I could easily be wrong, but every example I can find starts with a Load command.  Eg:

   http://msdn.microsoft.com/library/en-us/xmlsdk/htm/dom_hdi_vb_2w8j.asp

One possibility would be to write a pre-processor that scanned through the file to locate specific items, then generate a new subset XML file and load it.

-- Dan
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Author Comment

by:shahzad73
ID: 10656213
thanks for the advise...

lets see some body comes up with some other idea.


Shahzad
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