my $self = shift;
  return ( 'lcn.entry_id', 'lcn.flat_file',
           'lcn.file_offset', 'lcn.blastdbtracking_id');

  my ($self, $sth) = @_;

  my @out;
  my ( $entry_id, $flat_file, $file_offset, $blastdbtracking_id );
  $sth->bind_columns(\$ entry_id,\$ flat_file,\$ file_offset,\$ blastdbtracking_id );

  while($sth->fetch()) {
    push @out, Bio::EnsEMBL::ExternalData::Mole::Location->new(
              -entry_id           => $entry_id,
              -adaptor            => $self,
              -flat_file          => $flat_file,
              -file_offset        => $file_offset,
              -blastdbtracking_id => $blastdbtracking_id,
              );
  }
  return\@ out;
}


1;

  my $self = shift;
  return (['location' , 'lcn']);

  my $self = shift;
  my $entry = shift;

  my $location_object = $self->fetch_by_entry_id($entry->dbID);
  return $location_object;

  my ($self, $blastdbtracking_id) = @_;
  my $constraint = "lcn.blastdbtracking_id = '$blastdbtracking_id'";
  my ($location_obj) = @{ $self->generic_fetch($constraint) };
  return $location_obj;

  my ($self, $entry_id) = @_;
  my $constraint = "lcn.entry_id = '$entry_id'";
  my ($location_obj) = @{ $self->generic_fetch($constraint) };
  return $location_obj;

  my ($self, $flat_file) = @_;
  my $constraint = "lcn.flat_file = '$flat_file'";
  my ($location_obj) = @{ $self->generic_fetch($constraint) };
  return $location_obj;