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Revision controlled Perl DataStructure

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Contributed by Zombie mvr707 on Dec 27, 2001 at 05:20 UTC
Q&A  > hashes


Description:

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&&rob@cowsnet.com.au&&&split/[@.]/&&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";

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