get '/zwei' => sub {
        my $self = shift;
        my $nachname = $self->param( 'nachname' );
        my $sth = $dbh->prepare( "SELECT vorname, steuernummer FROM $table WHERE nachname == ?" );
        $sth->execute( $nachname );
        my @rows;
        while ( my $row = $sth->fetchrow_hashref ) {
                push @rows, { vorname => $row->{vorname}, nachname => $nachname, steuernummer => $row->{steuernummer} };
        }
        if ( not @rows ) {
                $self->redirect_to( 'eingabe' );
        } elsif ( @rows == 1 ) {
                my $steuernummer = $rows[0]{steuernummer};
                my $uri = URI->new( '/kontrolle' );
                $uri->query_form( steuernummer => $steuernummer );
                $self->redirect_to( $uri );
        } else {
                $self->stash( rows => \@rows );
                $self->render( 'zwei' );
        }
};