/root_dir/lib/Mojo_App.pm
package Mojo_App;
use Mojo::Base 'Mojolicious';

# This method will run once at server start
sub startup {
    my $self = shift;

    # Load configuration from hash returned by "my_app.conf"
    my $config = $self->plugin('Config');

    # Router
    my $r = $self->routes;
    # Normal route to controller
    $r->get('/')->to('main#index');

    #db conf

    my $db_conf= {
        db1 => {
            host => 'dbi:Sybase:server=ip01;database=db01',
            user => 'user01',
            pass => 'pass01'
        },
        db2 => {
            host => 'dbi:Sybase:server=ip02;database=db02',
            user => 'user02',
            pass => 'pass02'
        },
        db3 => {
            host => 'dbi:Sybase:server=ip03;database=db03',
            user => 'user03',
            pass => 'pass03'
        }
    };

    #db helper

    my $db;
    $self->helper(db => sub {
        use DBIx::Connector;
        my $self = shift;
        return 0 unless $self;
        if (exists($db_conf->{$self})) {
            my $db = DBIx::Connector->new($db_conf->{$self}->{host}, $db_conf->{$self}->{user}, $db_conf->{$self}->{pass}, {
                RaiseError => 1,
                AutoCommit => 1
            });
            return $db;
        } else {
            return "Connection not in config. \n" ;
        }
    });
}

1;

/root_dir/lib/Controller/Main.pm

sub index {
    my $self = shift;
    my $dbh = $self->db->('db1')->dbh();
    my $test = $dbh->selectall_arrayref('select * from test1', { Slice => {} });

    $self->render();

}