my $get_data_sub = sub {
     my ($offset, $rows) = @_;
     my @return_array;
    
     # Prepare SQL query:
     my $sth = $dbi->prepare("Your SQL here that fetches the data from $offset to $offset+$rows");
     $sth->execute($offset, $rows);
     
     while (my $array_ref = $sth->fetchrow_arrayref){
         push @return_array, $array_ref;
     }
     return \@return_array;
}