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percona-toolkit/lib/MySQLDump.pm

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# This program is copyright 2007-2011 Baron Schwartz, 2011 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.
# ###########################################################################
# MySQLDump package
# ###########################################################################
{
# Package: MySQLDump
# MySQLDump gets CREATE TABLE defs from MySQL.
package MySQLDump;
use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use constant MKDEBUG => $ENV{MKDEBUG} || 0;
( our $before = <<'EOF') =~ s/^ //gm;
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
EOF
( our $after = <<'EOF') =~ s/^ //gm;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
EOF
sub new {
my ( $class, %args ) = @_;
my $self = {
cache => 0, # Afaik no script uses this cache any longer because
# it has caused difficult-to-find bugs in the past.
};
return bless $self, $class;
}
sub dump {
my ( $self, $dbh, $quoter, $db, $tbl, $what ) = @_;
if ( $what eq 'table' ) {
my $ddl = $self->get_create_table($dbh, $quoter, $db, $tbl);
return unless $ddl;
if ( $ddl->[0] eq 'table' ) {
return $before
. 'DROP TABLE IF EXISTS ' . $quoter->quote($tbl) . ";\n"
. $ddl->[1] . ";\n";
}
else {
return 'DROP TABLE IF EXISTS ' . $quoter->quote($tbl) . ";\n"
. '/*!50001 DROP VIEW IF EXISTS '
. $quoter->quote($tbl) . "*/;\n/*!50001 "
. $self->get_tmp_table($dbh, $quoter, $db, $tbl) . "*/;\n";
}
}
elsif ( $what eq 'triggers' ) {
my $trgs = $self->get_triggers($dbh, $quoter, $db, $tbl);
if ( $trgs && @$trgs ) {
my $result = $before . "\nDELIMITER ;;\n";
foreach my $trg ( @$trgs ) {
if ( $trg->{sql_mode} ) {
$result .= qq{/*!50003 SET SESSION SQL_MODE='$trg->{sql_mode}' */;;\n};
}
$result .= "/*!50003 CREATE */ ";
if ( $trg->{definer} ) {
my ( $user, $host )
= map { s/'/''/g; "'$_'"; }
split('@', $trg->{definer}, 2);
$result .= "/*!50017 DEFINER=$user\@$host */ ";
}
$result .= sprintf("/*!50003 TRIGGER %s %s %s ON %s\nFOR EACH ROW %s */;;\n\n",
$quoter->quote($trg->{trigger}),
@{$trg}{qw(timing event)},
$quoter->quote($trg->{table}),
$trg->{statement});
}
$result .= "DELIMITER ;\n\n/*!50003 SET SESSION SQL_MODE=\@OLD_SQL_MODE */;\n\n";
return $result;
}
else {
return undef;
}
}
elsif ( $what eq 'view' ) {
my $ddl = $self->get_create_table($dbh, $quoter, $db, $tbl);
return '/*!50001 DROP TABLE IF EXISTS ' . $quoter->quote($tbl) . "*/;\n"
. '/*!50001 DROP VIEW IF EXISTS ' . $quoter->quote($tbl) . "*/;\n"
. '/*!50001 ' . $ddl->[1] . "*/;\n";
}
else {
die "You didn't say what to dump.";
}
}
# USEs the given database.
sub _use_db {
my ( $self, $dbh, $quoter, $new ) = @_;
if ( !$new ) {
MKDEBUG && _d('No new DB to use');
return;
}
my $sql = 'USE ' . $quoter->quote($new);
MKDEBUG && _d($dbh, $sql);
$dbh->do($sql);
return;
}
sub get_create_table {
my ( $self, $dbh, $quoter, $db, $tbl ) = @_;
if ( !$self->{cache} || !$self->{tables}->{$db}->{$tbl} ) {
my $sql = '/*!40101 SET @OLD_SQL_MODE := @@SQL_MODE, '
. q{@@SQL_MODE := REPLACE(REPLACE(@@SQL_MODE, 'ANSI_QUOTES', ''), ',,', ','), }
. '@OLD_QUOTE := @@SQL_QUOTE_SHOW_CREATE, '
. '@@SQL_QUOTE_SHOW_CREATE := 1 */';
MKDEBUG && _d($sql);
eval { $dbh->do($sql); };
MKDEBUG && $EVAL_ERROR && _d($EVAL_ERROR);
$self->_use_db($dbh, $quoter, $db);
$sql = "SHOW CREATE TABLE " . $quoter->quote($db, $tbl);
MKDEBUG && _d($sql);
my $href;
eval { $href = $dbh->selectrow_hashref($sql); };
if ( $EVAL_ERROR ) {
warn "Failed to $sql. The table may be damaged.\nError: $EVAL_ERROR";
return;
}
$sql = '/*!40101 SET @@SQL_MODE := @OLD_SQL_MODE, '
. '@@SQL_QUOTE_SHOW_CREATE := @OLD_QUOTE */';
MKDEBUG && _d($sql);
$dbh->do($sql);
my ($key) = grep { m/create table/i } keys %$href;
if ( $key ) {
MKDEBUG && _d('This table is a base table');
$self->{tables}->{$db}->{$tbl} = [ 'table', $href->{$key} ];
}
else {
MKDEBUG && _d('This table is a view');
($key) = grep { m/create view/i } keys %$href;
$self->{tables}->{$db}->{$tbl} = [ 'view', $href->{$key} ];
}
}
return $self->{tables}->{$db}->{$tbl};
}
sub get_columns {
my ( $self, $dbh, $quoter, $db, $tbl ) = @_;
MKDEBUG && _d('Get columns for', $db, $tbl);
if ( !$self->{cache} || !$self->{columns}->{$db}->{$tbl} ) {
$self->_use_db($dbh, $quoter, $db);
my $sql = "SHOW COLUMNS FROM " . $quoter->quote($db, $tbl);
MKDEBUG && _d($sql);
my $cols = $dbh->selectall_arrayref($sql, { Slice => {} });
$self->{columns}->{$db}->{$tbl} = [
map {
my %row;
@row{ map { lc $_ } keys %$_ } = values %$_;
\%row;
} @$cols
];
}
return $self->{columns}->{$db}->{$tbl};
}
sub get_tmp_table {
my ( $self, $dbh, $quoter, $db, $tbl ) = @_;
my $result = 'CREATE TABLE ' . $quoter->quote($tbl) . " (\n";
$result .= join(",\n",
map { ' ' . $quoter->quote($_->{field}) . ' ' . $_->{type} }
@{$self->get_columns($dbh, $quoter, $db, $tbl)});
$result .= "\n)";
MKDEBUG && _d($result);
return $result;
}
sub get_triggers {
my ( $self, $dbh, $quoter, $db, $tbl ) = @_;
if ( !$self->{cache} || !$self->{triggers}->{$db} ) {
$self->{triggers}->{$db} = {};
my $sql = '/*!40101 SET @OLD_SQL_MODE := @@SQL_MODE, '
. q{@@SQL_MODE := REPLACE(REPLACE(@@SQL_MODE, 'ANSI_QUOTES', ''), ',,', ','), }
. '@OLD_QUOTE := @@SQL_QUOTE_SHOW_CREATE, '
. '@@SQL_QUOTE_SHOW_CREATE := 1 */';
MKDEBUG && _d($sql);
eval { $dbh->do($sql); };
MKDEBUG && $EVAL_ERROR && _d($EVAL_ERROR);
$sql = "SHOW TRIGGERS FROM " . $quoter->quote($db);
MKDEBUG && _d($sql);
my $sth = $dbh->prepare($sql);
$sth->execute();
if ( $sth->rows ) {
my $trgs = $sth->fetchall_arrayref({});
foreach my $trg (@$trgs) {
# Lowercase the hash keys because the NAME_lc property might be set
# on the $dbh, so the lettercase is unpredictable. This makes them
# predictable.
my %trg;
@trg{ map { lc $_ } keys %$trg } = values %$trg;
push @{ $self->{triggers}->{$db}->{ $trg{table} } }, \%trg;
}
}
$sql = '/*!40101 SET @@SQL_MODE := @OLD_SQL_MODE, '
. '@@SQL_QUOTE_SHOW_CREATE := @OLD_QUOTE */';
MKDEBUG && _d($sql);
$dbh->do($sql);
}
if ( $tbl ) {
return $self->{triggers}->{$db}->{$tbl};
}
return values %{$self->{triggers}->{$db}};
}
sub get_databases {
my ( $self, $dbh, $quoter, $like ) = @_;
if ( !$self->{cache} || !$self->{databases} || $like ) {
my $sql = 'SHOW DATABASES';
my @params;
if ( $like ) {
$sql .= ' LIKE ?';
push @params, $like;
}
my $sth = $dbh->prepare($sql);
MKDEBUG && _d($sql, @params);
$sth->execute( @params );
my @dbs = map { $_->[0] } @{$sth->fetchall_arrayref()};
$self->{databases} = \@dbs unless $like;
return @dbs;
}
return @{$self->{databases}};
}
sub get_table_status {
my ( $self, $dbh, $quoter, $db, $like ) = @_;
if ( !$self->{cache} || !$self->{table_status}->{$db} || $like ) {
my $sql = "SHOW TABLE STATUS FROM " . $quoter->quote($db);
my @params;
if ( $like ) {
$sql .= ' LIKE ?';
push @params, $like;
}
MKDEBUG && _d($sql, @params);
my $sth = $dbh->prepare($sql);
$sth->execute(@params);
my @tables = @{$sth->fetchall_arrayref({})};
@tables = map {
my %tbl; # Make a copy with lowercased keys
@tbl{ map { lc $_ } keys %$_ } = values %$_;
$tbl{engine} ||= $tbl{type} || $tbl{comment};
delete $tbl{type};
\%tbl;
} @tables;
$self->{table_status}->{$db} = \@tables unless $like;
return @tables;
}
return @{$self->{table_status}->{$db}};
}
sub get_table_list {
my ( $self, $dbh, $quoter, $db, $like ) = @_;
if ( !$self->{cache} || !$self->{table_list}->{$db} || $like ) {
my $sql = "SHOW /*!50002 FULL*/ TABLES FROM " . $quoter->quote($db);
my @params;
if ( $like ) {
$sql .= ' LIKE ?';
push @params, $like;
}
MKDEBUG && _d($sql, @params);
my $sth = $dbh->prepare($sql);
$sth->execute(@params);
my @tables = @{$sth->fetchall_arrayref()};
@tables = map {
my %tbl = (
name => $_->[0],
engine => ($_->[1] || '') eq 'VIEW' ? 'VIEW' : '',
);
\%tbl;
} @tables;
$self->{table_list}->{$db} = \@tables unless $like;
return @tables;
}
return @{$self->{table_list}->{$db}};
}
sub _d {
my ($package, undef, $line) = caller 0;
@_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
map { defined $_ ? $_ : 'undef' }
@_;
print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}
1;
}
# ###########################################################################
# End MySQLDump package
# ###########################################################################
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