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Bio::DB::EMBL - Database object interface for EMBL entry retrieval
Package variables
No package variables defined.
Included modules
  use Bio::DB::EMBL;
$embl = new Bio::DB::EMBL; # remember that EMBL_ID does not equal GenBank_ID! $seq = $embl->get_Seq_by_id('BUM'); # EMBL ID print "cloneid is ", $seq->id, "\n"; # or changeing to accession number and Fasta format ... $embl->request_format('fasta'); $seq = $embl->get_Seq_by_acc('J02231'); # EMBL ACC print "cloneid is ", $seq->id, "\n"; # especially when using versions, you better be prepared # in not getting what what want eval { $seq = $embl->get_Seq_by_version('J02231.1'); # EMBL VERSION }; print "cloneid is ", $seq->id, "\n" unless $@; # or ... best when downloading very large files, prevents # keeping all of the file in memory # also don't want features, just sequence so let's save bandwith # and request Fasta sequence $embl = new Bio::DB::EMBL(-retrievaltype => 'tempfile' , -format => 'fasta'); my $seqio = $embl->get_Stream_by_batch(['AC013798', 'AC021953'] ); while( my $clone = $seqio->next_seq ) { print "cloneid is ", $clone->id, "\n"; }
Allows the dynamic retrieval of sequence objects Bio::Seq from the
EMBL database using the dbfetch script at EBI:
In order to make changes transparent we have host type (currently only
ebi) and location (defaults to ebi) separated out. This allows later
additions of more servers in different geographical locations.
The functionality of this module is inherited from Bio::DB::DBFetch
which implements Bio::DB::WebDBSeqI.
Methods description
_check_idcode    nextTop
  Title   : _check_id
Usage :
Returns : A Bio::DB::RefSeq reference or throws
Args : $id(s), $string
  Title   : get_Stream_by_acc
Usage : $seq = $db->get_Seq_by_acc([$acc1, $acc2]);
Function: Gets a series of Seq objects by accession numbers
Returns : a Bio::SeqIO stream object
Args : $ref : a reference to an array of accession numbers for
the desired sequence entries
Note : For GenBank, this just calls the same code for get_Stream_by_id()
 Title   : new
Usage : $gb = Bio::DB::GenBank->new(@options)
Function: Creates a new genbank handle
Returns : New genbank handle
Args : -delay number of seconds to delay between fetches (3s)
NOTE: There are other options that are used internally.
Methods code
    # you can add your own here theoretically.
%HOSTS = ( 'dbfetch' => { baseurl => 'http://%s/cgi-bin/dbfetch?db=embl&style=raw', hosts => { 'ebi' => '' } } ); %FORMATMAP = ( 'embl' => 'embl', 'fasta' => 'fasta' ); $DEFAULTFORMAT = 'embl';
sub _check_id {
    my ($self, $ids) = @_;

    # NT contigs can not be retrieved
$self->throw("NT_ contigs are whole chromosome files which are not part of regular". "database distributions. Go to") if $ids =~ /NT_/; # Asking for a RefSeq from EMBL/GenBank
if ($ids =~ /N._/) { $self->warn("[$ids] is not a normal sequence database but a RefSeq entry.". " Redirecting the request.\n") if $self->verbose >= 0; return new Bio::DB::RefSeq(-verbose => $self->verbose); } } 1;
sub get_Stream_by_acc {
    my ($self, $ids ) = @_;
    my $newdb = $self->_check_id($ids);
    if ($newdb && $newdb->isa('Bio::DB::RefSeq')) {
	return $newdb->get_seq_stream('-uids' => $ids, '-mode' => 'single');
    } else {
	return $self->get_seq_stream('-uids' => $ids, '-mode' => 'single');
sub new {
    my ($class, @args ) = @_;
    my $self = $class->SUPER::new(@args);

    $self->{ '_hosts' } = {};
    $self->{ '_formatmap' } = {};

    $self->{'_default_format'} = $DEFAULTFORMAT;

    return $self;
General documentation
Mailing ListsTop
User feedback is an integral part of the evolution of this and other
Bioperl modules. Send your comments and suggestions preferably to one
of the Bioperl mailing lists. Your participation is much appreciated.              - General discussion - About the mailing lists
Reporting BugsTop
Report bugs to the Bioperl bug tracking system to help us keep track
the bugs and their resolution.
Bug reports can be submitted via email or the web:
AUTHOR - Heikki LehvaslaihoTop
Email Heikki Lehvaslaiho <>
The rest of the documentation details each of the object
methods. Internal methods are usually preceded with a _
Bio::DB::WebDBSeqI methodsTop
Overriding WebDBSeqI method to help newbies to retrieve sequences.
EMBL database is all too often passed RefSeq accessions. This
redirects those calls. See Bio::DB::RefSeq.