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# This program is copyright 2010 Percona Inc.
# Feedback and improvements are welcome.
#
# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# This program 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, version 2; OR the Perl Artistic License. On UNIX and similar
# systems, you can issue `man perlgpl' or `man perlartistic' to read these
# licenses.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA 02111-1307 USA.
package delete_more;
# This mk-archiver plugin demonstrates how to archive/DELETE rows on one
# table--the main table--and also DELETE related rows on other tables.
# The picture is:
#
# main_table-123: other_table-123:
# col-m 1 col-o 1
# col-m 2 col-o 1
# col-o 2
#
# When rows on main table are deleted, corresponding rows on the other
# tables are deleted where main table col-m = other table col-o. This
# works for both single and --bulk-delete. The tables are *not* 1-to-1
# so a single delete for main col-m = 1 will result in two deletes fro
# other col-o = 1. This means --limit does *not* apply on other table.
#
# The other table's name is derived from the main table's name according
# to the settings below.
#
# Limitations:
# * all tables must be on the same server
# * other table column (e.g. opk) must be the same on all other tables
# * main table column and other table columns must be numeric
# * no NULL values
use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use constant PTDEBUG => $ENV{PTDEBUG};
use Data::Dumper;
$Data::Dumper::Indent = 1;
$Data::Dumper::Sortkeys = 1;
$Data::Dumper::Quotekeys = 0;
# ###########################################################################
# Customize these values for your tables.
# ###########################################################################
my $main_table_col = 'id'; # main table pk col
my $other_table_col = 'id'; # other table pk col
my $main_table_id = qr/(\d+)$/;
my $other_table_base = 'other_table-';
my $other_db = undef; # undef = same as main db
my $other_table = undef; # undef = auto-determine
# ###########################################################################
# Don't modify anything below here.
# ###########################################################################
sub new {
my ( $class, %args ) = @_;
my $o = $args{OptionParser};
my $q = $args{Quoter};
$other_db ||= $args{db};
if ( !$other_table ) {
my ($id) = $args{tbl} =~ m/$main_table_id/;
die "Cannot determine other table; $args{tbl} does not match "
. $main_table_id unless $id;
$other_table = $other_table_base . $id;
}
$other_table = $q->quote($other_db, $other_table);
PTDEBUG && _d('Other table:', $other_table);
my $self = {
dbh => $args{dbh},
bulk_delete => $o->get('bulk-delete'),
limit => $o->get('limit'),
delete_rows => [], # saved main table col vals for --bulk-delete
main_col_pos => -1,
other_tbl => $other_table,
};
if ( $o->get('dry-run') ) {
print "# delete_more other table $other_table\n";
}
return bless $self, $class;
}
sub before_begin {
my ( $self, %args ) = @_;
my $allcols = $args{allcols};
PTDEBUG && _d('allcols:', Dumper($allcols));
my $colpos = -1;
foreach my $col ( @$allcols ) {
$colpos++;
last if $col eq $main_table_col;
}
if ( $colpos < 0 ) {
die "Main table column $main_table_col not selected by mk-archiver: "
. join(', ', @$allcols);
}
PTDEBUG && _d('main col pos:', $colpos);
$self->{main_col_pos} = $colpos;
return;
}
sub is_archivable {
my ( $self, %args ) = @_;
my $row = $args{row};
push @{$self->{delete_rows}}, $row->[$self->{main_col_pos}]
if $self->{bulk_delete};
return 1;
}
sub before_delete {
my ( $self, %args ) = @_;
my $row = $args{row};
my $val = $row->[ $self->{main_col_pos} ];
my $dbh = $self->{dbh};
my $sql = "DELETE FROM $self->{other_tbl} "
. "WHERE $other_table_col=$val";
PTDEBUG && _d($sql);
eval {
$dbh->do($sql);
};
if ( $EVAL_ERROR ) {
PTDEBUG && _d($EVAL_ERROR);
warn $EVAL_ERROR;
}
return;
}
sub before_bulk_delete {
my ( $self, %args ) = @_;
if ( !scalar @{$self->{delete_rows}} ) {
warn "before_bulk_delete() called without any rows to delete";
return;
}
my $dbh = $self->{dbh};
my $delete_rows = join(',', @{$self->{delete_rows}});
$self->{delete_rows} = []; # clear for next call
my $sql = "DELETE FROM $self->{other_tbl} "
. "WHERE $other_table_col IN ($delete_rows) ";
# . "LIMIT $self->{limit}";
PTDEBUG && _d($sql);
eval {
$dbh->do($sql);
};
if ( $EVAL_ERROR ) {
PTDEBUG && _d($EVAL_ERROR);
warn $EVAL_ERROR;
}
return;
}
sub after_finish {
my ( $self ) = @_;
return;
}
sub _d {
my ($package, undef, $line) = caller 0;
@_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
map { defined $_ ? $_ : 'undef' }
@_;
print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}
1;
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