package InputData;
use Moose;
use InputDataSubtypes qw(subtype);

has 'attribute' => (
     is => 'rw',
     isa => subtype,
     required => 1,
);

1;

##</code><code>##

package Operations;
use DBI;
use DBConnection;
use InputData;
use Moose;

sub querryDatabase() {
   my($inputData) = @_;
   my $query = 'select stuff from myTable where attribute = ?';
   my $dataSource = DBConnection->getConnection();
   my $preparedStatement = $dataSource->prepare($query);
   $preparedStatement->execute($inputData->attribute) or die "SQL Error: $DBI::errstr\n"; 
   while (my @row = $preparedStatement->fetchrow_array){ print "@row\n"; }
   
   $preparedStatement->finish();
   $dataSource->disconnect();
   
}

1;

##</code><code>##

package MainScript;
use strict;
use warnings;
use v5.22;
use InputData;
use Operations;
use Moose;
my $myInputData = InputData->new(

	{
		attribute => 'caller',
		
	}			
);

#here i do the sub call;
Operations->querryDatabase($myInputData);