my static $dbh

##</code><code>##

>
my $ex1 = new DataSomething();
my $ex2 = new DataSomething();

$ex1->set_index( 1 );
$ex2->set_index( 2 ); # so they'll get different data

$ex1->get_data();  # this would initialize the db and get the data
$ex2->get_data();  # this would use the already initialized db