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my $cvterm_id;  # this scalar is going to be a hashref
  while (my $hashref = $sth->fetchrow_hashref) {
    $$cvterm_id{$$hashref{termname}} = $$hashref{cvterm_id};
  }

my $cvterm_id;  # this scalar is going to be a hashref
  while (my $hashref = $sth->fetchrow_hashref) {
    $cvterm_id->{$$hashref{termname}} = $$hashref{cvterm_id};
  }

my $cvterm_id;  # this scalar is going to be a hashref
  while (my $hashref = $sth->fetchrow_hashref) {
    $cvterm_id->{$hashref->{termname}} = $hashref->{cvterm_id};
  }