#!/usr/bin/perl
package World::Schema;
use base qw/DBIx::Class::Schema::Loader/;
$ENV{SCHEMA_LOADER_BACKCOMPAT} = 1;
my $schema = World::Schema->connect("DBI:mysql:database=world", "world", "world1",
    {PrintError => 1, RaiseError => 1, mysql_enable_utf8 => 1});

package main;
use DBIx::Connector;
use DBIx::Struct;
use strict;
use warnings;

use Benchmark qw|:all|;

# used this world database https://dev.mysql.com/doc/index-other.html

DBIx::Struct::connect("DBI:mysql:database=world", "world", "world1");
my $connector = DBIx::Connector->new("DBI:mysql:database=world", "world", "world1",
    {PrintError => 1, RaiseError => 1, mysql_enable_utf8 => 1});

my $tests = {
    Struct => sub {
        my $cities = all_rows(
            [   "city s" => -right => "country c" => -left => "countrylanguage l",
                -columns => ['s.Name city', 'c.Name country', 'Language language'],
            ],
            -where => {Language => 'English'}
        );
    },
    StructFor => sub {
        my $cities = for_rows(
            [   "city s" => -right => "country c" => -left => "countrylanguage l",
                -columns => ['s.Name city', 'c.Name country', 'Language language'],
            ],
            -where => {Language => 'English'},
            sub {1}
        );
    },
    DBI => sub {
        my $dbh_cities = $connector->run(
            sub {
                $_->selectall_arrayref(
                    qq{select s.Name city, c.Name country, Language language from city s}
                        . qq{ right join country c on(s.CountryCode = c.Code)}
                        . qq{ left join countrylanguage l on(l.CountryCode = c.Code)}
                        . qq{  WHERE ( Language = ? )},
                    {Slice => {}},
                    'English'
                );
            }
        );
    },
    DBIC => sub {
        $schema->resultset('Country')->search(
            {'countrylanguages.Language' => 'English'},
            {   join   => ['cities', 'countrylanguages'],
                select => [qw(cities.Name me.Name countrylanguages.Language)],
                as     => [qw(city country language)]
            }
        )->all;
    }
};

cmpthese(-5, $tests);

__END__
           Rate      DBIC    Struct StructFor       DBI
DBIC      123/s        --      -66%      -67%      -80%
Struct    361/s      194%        --       -3%      -40%
StructFor 371/s      202%        3%        --      -38%
DBI       602/s      389%       67%       62%        --

another computer:

           Rate      DBIC StructFor    Struct       DBI
DBIC      119/s        --      -60%      -64%      -77%
StructFor 295/s      148%        --       -9%      -44%
Struct    325/s      174%       10%        --      -38%
DBI       526/s      343%       78%       62%        --