lib/Mail/SpamAssassin/BayesStore/BDB.pm [1328:1370]:
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  unless (defined($num_spam)) {
    dbg("bayes: unable to find num spam, please check file");
    $error_p = 1;
  }

  unless (defined($num_ham)) {
    dbg("bayes: unable to find num ham, please check file");
    $error_p = 1;
  }

  if ($error_p) {
    dbg("bayes: error(s) while attempting to load $filename, clearing database, correct and re-run");
    $self->clear_database();
    return 0;
  }

  if ($num_spam || $num_ham) {
    unless ($self->nspam_nham_change($num_spam, $num_ham)) {
      dbg("bayes: error updating num spam and num ham, clearing database");
      $self->clear_database();
      return 0;
    }
  }

  dbg("bayes: parsed $line_count lines");
  dbg("bayes: created database with $token_count tokens based on $num_spam spam messages and $num_ham ham messages");

  $self->untie_db();

  return 1;
}

=head2 db_readable

public instance (Boolean) db_readable()

Description:
This method returns a boolean value indicating if the database is in a
readable state.

=cut

sub db_readable {
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lib/Mail/SpamAssassin/BayesStore/SQL.pm [1586:1628]:
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  unless (defined($num_spam)) {
    dbg("bayes: unable to find num spam, please check file");
    $error_p = 1;
  }

  unless (defined($num_ham)) {
    dbg("bayes: unable to find num ham, please check file");
    $error_p = 1;
  }

  if ($error_p) {
    dbg("bayes: error(s) while attempting to load $filename, clearing database, correct and re-run");
    $self->clear_database();
    return 0;
  }

  if ($num_spam || $num_ham) {
    unless ($self->nspam_nham_change($num_spam, $num_ham)) {
      dbg("bayes: error updating num spam and num ham, clearing database");
      $self->clear_database();
      return 0;
    }
  }

  dbg("bayes: parsed $line_count lines");
  dbg("bayes: created database with $token_count tokens based on $num_spam spam messages and $num_ham ham messages");

  $self->untie_db();

  return 1;
}

=head2 db_readable

public instance (Boolean) db_readable()

Description:
This method returns a boolean value indicating if the database is in a
readable state.

=cut

sub db_readable {
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