Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot

Revision controlled Perl DataStructure

by Zombie mvr707 (Initiate)
on Dec 27, 2001 at 05:20 UTC ( #134526=categorized question: print w/replies, xml ) Need Help??
Contributed by Zombie mvr707 on Dec 27, 2001 at 05:20 UTC
Q&A  > hashes


AM maintaining a directory as a perl hash. New employees get added and old get deleted as time passes by.... Whats the optimal way to maintain te hash such that I can recover the state of the hash at any given time.

Answer: Revision controlled Perl DataStructure
contributed by rob_au

Your best method of implementing this would be to write the data structure to a dated text file using a serialisation/dumper module such as Storable or Data::Dumper - An example piece of code might look something like this:

use Data::Dumper qw/Dumper/; use IO::File; use strict; my %hash = { # Your data structure lies within %hash }; my $fn = "dump." . sprintf("%04d%02d%02d", (localtime)[5] + 1900, (loc +altime)[4] + 1, (localtime)[3]); my $fd = IO::File->new($fn, "w"); if (defined $fd) { print $fd Dumper(\%hash); $fd->close; };

Note that this code is very rough and should not be used in this form - A better revision would incorporate file locking, tests for file existence and better time stamping.


perl -e 's&&[@.]/&&s&.com.&_&&&print'

Answer: Revision controlled Perl DataStructure
contributed by expertseries

Here's another, rob thanks for that example of sprintf.

print "Content-Type: text/plain;\n\n"; #------------------------------------------------------------------ # Current time as 'YYYYMMDD.HHMMSS' (GMT) ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)=gmtime(time); $revision = sprintf("%04d%02d%02d.%02d%02d%02d", $year+1900,$mon+1,$mday,$hour,$min,$sec); #------------------------------------------------------------------ print "\n\nRevision: $revision\n\n";

Please (register and) log in if you wish to add an answer

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others romping around the Monastery: (3)
    As of 2017-08-24 04:16 GMT
    Find Nodes?
      Voting Booth?
      Who is your favorite scientist and why?

      Results (364 votes). Check out past polls.