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#! /usr/bin/env perl
# dbs_empty - erases any data from a given SQL database
# Copyright (C) 1999-2012 Stefan Hornburg
# Author: Stefan Hornburg (Racke) <racke@linuxia.de>
# Maintainer: Stefan Hornburg (Racke) <racke@linuxia.de>
# Version: 0.19
# This file 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, or (at your option) any
# later version.
# This file 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 this file; see the file COPYING. If not, write to the Free
# Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
use strict;
use warnings;
use DBIx::Easy;
use Getopt::Long;
use Term::ReadKey;
# process commandline parameters
my %opts;
my $whandler = $SIG{__WARN__};
$SIG{__WARN__} = sub {print STDERR "$0: @_";};
unless (GetOptions (\%opts, 'exclude-matching-tables=s', 'tables|t')) {
exit 1;
}
$SIG{__WARN__} = $whandler;
# sanity check on commandline parameters
if (exists $opts{'exclude-matching-tables'}) {
eval {'' =~ /$opts{'exclude-matching-tables'}/;};
if ($@) {
$@ =~ s%at /.*$%%;
die "$0: $@";
}
}
my $dbif;
my $pwdused = 0;
my ($driver, $database, $user) = @ARGV;
$dbif = new DBIx::Easy ($driver, $database, $user);
# handler for DBI error messages and missing password
$dbif -> install_handler (\&fatal);
# we need to explicitly establish the connection
# for the case that a password is needed
$dbif -> connect;
my %fieldmap;
my ($sth, $keyfield, $update);
my ($table, $key, $fieldnames, @values, $headline);
my (@columns, $routine);
for ($dbif->tables) {
# skip tables preserved by user
if (exists $opts{'exclude-matching-tables'}) {
next if $table =~ /$opts{'exclude-matching-tables'}/;
}
if ($opts{'tables'}) {
# remove table from database
$dbif -> process ("DROP TABLE $_");
} else {
# empty table
$dbif -> process ("DELETE FROM $_ WHERE 1 = 1");
}
}
# ensures commit
undef $dbif;
# -----------------------------------
# FUNCTION: fatal
#
# Error handler called by DBIx::Easy.
# -----------------------------------
sub fatal {
my ($statement, $err, $msg) = @_;
my $pwd;
if ($dbif->is_auth_error ($err)) {
unless ($pwdused) {
print "We need a password.\n";
$pwd = querypwd();
$pwdused = 1;
# retry the connection
if (length ($pwd)) {
$dbif = new DBIx::Easy ($driver, $database, $user, $pwd);
$dbif -> install_handler (\&fatal);
$dbif -> connect ();
return;
} else {
die ("$statement: $msg.\n");
}
}
}
die ("$statement: $msg.\n");
}
# ----------------------------
# FUNCTION: querypwd
#
# Queries user for a password.
# ----------------------------
sub querypwd () {
my $pwd;
print "Password: ";
ReadMode ('noecho'); # turn echo off
$pwd = ReadLine (0);
ReadMode ('restore'); # restore terminal
print "\n";
chomp ($pwd);
$pwd;
}
# script documentation (POD style)
=head1 NAME
dbs_empty - Empty SQL Databases
=head1 DESCRIPTION
dbs_empty is an utility that B<completely erases> any data from
a given SQL database.
=head1 COMMAND LINE PARAMETERS
Required command line parameters are the DBI driver
(C<Pg> for Postgres or C<mysql> for MySQL)
and the database name. The third parameter is optionally
and specifies the database user and/or the host where the
database resides (C<racke>, C<racke@linuxia.de> or C<@linuxia.de>).
=head1 COMMAND LINE OPTIONS
=head2 B<--exclude-matching-tables>=REGEXP
Excludes any table matching the regular expression REGEXP from dumping.
=head2 B<-t, --tables>
Remove tables from database too.
=head1 AUTHOR
Stefan Hornburg (Racke), racke@linuxia.de
=head1 SEE ALSO
perl(1), DBIx::Easy(3)
=cut
|
