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Best way to go about this?

 
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Old 09-27-2012
Best way to go about this?
I am processing a very large file, which is a text csv report of a database.

I would like to parse this csv file into a bunch of XML files.

I am trying to decide the most efficient way to go about doing this.

Should I open all the XML files at the same time, and as I encounter data I write to whichever descriptor? This approach would only require iterating through the csv file once. But I would be maintaining a bunch of descriptors at the same time, is that efficient?

Should I open and close a descriptor each time I need to write a piece of information to one of the XML files? This approach would also only require iterating through the csv file once. But I would be constantly opening and closing descriptors.

Should I fill out each XML file one at a time, iterating through the whole csv file each time?

Help much appreciated.
 
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linux::distribution::packages

Linux::Distribution::Packages(3pm)			User Contributed Perl Documentation			Linux::Distribution::Packages(3pm)

NAME

       Linux::Distribution::Packages - list all packages on various Linux distributions

SYNOPSIS

	 use Linux::Distribution::Packages qw(distribution_packages distribution_write);

	 $linux = new Linux::Distribution::Packages({'format' => 'csv', 'output_file' => 'packages.csv'});
	 $linux->distribution_write();

	 # Or you can (re)set the options when you write.
	 $linux->distribution_write({'format' => 'xml', 'output_file' => 'packages.xml'});

	 # If you want to reload the package data
	 $linux->distribution_packages();

DESCRIPTION

       This is a simple module that uses Linux::Distribution to guess the linux distribution and then uses the correct commands to list all the
       packages on the system and then output them in one of three formats:  native, csv, and xml.

       Distributions currently working:  debian, ubuntu, fedora, redhat, suse, gentoo, slackware, redflag.

       The module inherits from Linux::Distribution, so can also use its calls.

   EXPORT
       None by default.

TODO

       * Add the capability to correctly get packages for all recognized distributions.  * Seperate out parsing from writing.  Parse data to hash
       and give access to hash.  Then write the formatted data from the hash.

AUTHORS

       Judith Lebzelter, <judith@osdl.org> Alberto Re, <alberto@accidia.net>

COPYRIGHT AND LICENSE

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.5 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.10.1							    2006-04-19					Linux::Distribution::Packages(3pm)