# Alter the data type of the value as it's being passed
 $sth -> execute(
     0 + $self -> param('catalog_id'),
     $start_item,
     20
 );


 # Specify the data type explicitly
 $sth -> bind_param( 1, $self->param('catalog_id'), SQL_INTEGER);
 $sth -> bind_param( 2, $start_item );
 $sth -> bind_param( 3, 20 );
 $sth -> execute;