# Movable Type (r) Open Source (C) 2001-2010 Six Apart, Ltd.
# This program is distributed under the terms of the
# GNU General Public License, version 2.
#
# $Id: mysql.pm 3466 2009-02-27 19:55:09Z bchoate $

package MT::ObjectDriver::Driver::DBD::mysql;

use strict;
use warnings;

use base qw(
    MT::ObjectDriver::Driver::DBD::Legacy
    Data::ObjectDriver::Driver::DBD::mysql
    MT::ErrorHandler
);

sub dsn_from_config {
    my $dbd = shift;
    my $dsn = $dbd->SUPER::dsn_from_config(@_);
    my ($cfg) = @_;
    $dsn .= ':database=' . $cfg->Database;
    $dsn .= ';hostname=' . $cfg->DBHost if $cfg->DBHost;
    $dsn .= ';mysql_socket=' . $cfg->DBSocket if $cfg->DBSocket;
    $dsn .= ';port=' . $cfg->DBPort if $cfg->DBPort;
    return $dsn;
}

sub sql_class {
    require MT::ObjectDriver::SQL::mysql;
    return 'MT::ObjectDriver::SQL::mysql';
}

sub ddl_class {
    require MT::ObjectDriver::DDL::mysql;
    return 'MT::ObjectDriver::DDL::mysql';
}

sub init_dbh {
    my $dbd = shift;
    my ($dbh) = @_;
    $dbd->SUPER::init_dbh(@_);
    $dbd->_set_names($dbh);
}

sub _set_names {
    my $dbd = shift;
    my ($dbh) = @_;
    return 1 if exists $dbh->{private_set_names};

    my $cfg = MT->config;
    my $set_names = $cfg->SQLSetNames;
    $dbh->{private_set_names} = 1;
    return 1 if (defined $set_names) && !$set_names;

    eval {
        local $@;
        my $sth = $dbh->prepare('show variables like "character_set_database"')
            or die "error collecting variables from mysql: " . $dbh->errstr;
        $sth->execute or die "error collecting variables from mysql: " . $sth->errstr;
        my $result = $sth->fetchall_hashref('Variable_name');
        my $charset_db = $result->{character_set_database}{Value};
        if (defined($charset_db) && ($charset_db ne 'latin1')) {
            # MySQL 4.1+ and non-latin1(database) == needs SET NAMES call.
            my $c = lc $cfg->PublishCharset;
            my %Charset = (
                'utf-8' => 'utf8',
                'shift_jis' => 'sjis',
                'shift-jis' => 'sjis',
                'euc-jp' => 'ujis',
                #'iso-8859-1' => 'latin1'
            );
            $c = $Charset{$c} ? $Charset{$c}  : $c;
            $dbh->do("SET NAMES " . $c) or
                return ($dbh->errstr);
            if (!defined $set_names) {
                # SQLSetNames has never been assigned; we had a successful
                # 'SET NAMES' command, so it's safe to SET NAMES in the future.
                $cfg->SQLSetNames(1);
            }
        } else {
            # 'set names' command isn't working for this verison of mysql,
            # assign SQLSetNames to 0 to prevent further errors.
            $cfg->SQLSetNames(0);
            return 0;
        }
    };
    1;
}

1;
__END__

=head1 NAME

MT::ObjectDriver::Driver::DBD::mysql

=head1 METHODS

TODO

=head1 AUTHOR & COPYRIGHT

Please see L<MT/AUTHOR & COPYRIGHT>.

=cut
