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File:  [LON-CAPA] / loncom / debugging_tools / dump_db.pl
Revision 1.3: download - view: text, annotated - select for diffs
Thu Sep 4 14:32:46 2003 UTC (21 years, 8 months ago) by matthew
Branches: MAIN
CVS tags: version_1_3_X, version_1_3_3, version_1_3_2, version_1_3_1, version_1_3_0, version_1_2_X, version_1_2_99_1, version_1_2_99_0, version_1_2_1, version_1_2_0, version_1_1_X, version_1_1_99_5, version_1_1_99_4, version_1_1_99_3, version_1_1_99_2, version_1_1_99_1, version_1_1_99_0, version_1_1_3, version_1_1_2, version_1_1_1, version_1_1_0, version_1_0_99_3, version_1_0_99_2, version_1_0_99_1, version_1_0_99, HEAD
Added automagic time localization command line option '-t'.

#!/usr/bin/perl -w
#
# The LearningOnline Network
#
# dump_db.pl - dump a GDBM database to standard output, unescaping if asked to.
#
# $Id: dump_db.pl,v 1.3 2003/09/04 14:32:46 matthew Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
#################################################
use strict;
use Getopt::Long;
use GDBM_File;

#
# Options
my ($unesc,$help,$localize_times) = (0,0,0);
GetOptions("unescape" => \$unesc,
           "u"        => \$unesc,
           "t"        => \$localize_times,
           "help"     => \$help);

#
# Help them out if they ask for it
if ($help) {
    print <<END;
dump_db.pl - dump GDBM_File databases to stdout.  
Specify the database filenames on the command line.
Specify --unescape to have all the keys and values unescaped from every
database.
Options:
   --help     Display this help.
   --unescape Unescape the keys and values before printing them out.
   -u        Same as --unescape
   -t        Localize times when possible (human readable times)
Examples: 
    dump_db.pl mydata.db
    dump_db.pl mydata.db yourdata.db ourdata.db theirdata.db
    dump_db.pl --unescape \*db
END
    exit;
}

#
# Loop through ARGV getting files.
while (my $fname = shift) {
    my %db;
    if (! tie(%db,'GDBM_File',$fname,&GDBM_READER,0640)) {
        warn "Unable to tie to $fname";
        next;
    }
    while (my ($key,$value) = each(%db)) {
        if ($unesc) {
            $key = &unescape($key);
            $value = &unescape($value);
        }
        if ($localize_times) {
            if ($value =~ /^\s*([0-9]{10,10})\s*$/) {
                $value = $value.' [ '.localtime($1).' ]';
            }
        }
        print "$key = $value\n";
    }
    untie %db;
}
exit;

######################################
sub unescape {
    my $str=shift;
    $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
    return $str;
}
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