Bio::DB::Query
GenBank
Summary
Bio::DB::Query::GenBank - Build a GenBank Entrez Query
Package variables
No package variables defined.
Included modules
URI::Escape ' uri_unescape '
Inherit
Synopsis
my $query_string = 'Oryza[Organism] AND EST[Keyword]';
my $query = Bio::DB::Query::GenBank->new(-db=>'nucleotide',
-query=>$query_string,
-mindate => '2001',
-maxdate => '2002');
my $count = $query->count;
my @ids = $query->ids;
# get a genbank database handle
my $gb = new Bio::DB::GenBank;
my $stream = $gb->get_Stream_by_query($query);
while (my $seq = $stream->next_seq) {
# do something with the sequence object
}
# initialize the list yourself
my $query = Bio::DB::Query::GenBank->new(-ids=>[195052,2981014,11127914]);
Description
This class encapsulates NCBI Entrez queries. It can be used to store
a list of GI numbers, to translate an Entrez query expression into a
list of GI numbers, or to count the number of terms that would be
returned by a query. Once created, the query object can be passed to
a Bio::DB::GenBank object in order to retrieve the entries
corresponding to the query.
Methods
Methods description
Title : new
Usage : $db = Bio::DB::Query::GenBank->new(@args)
Function: create new query object
Returns : new query object
Args : -db database ('protein' or 'nucleotide')
-query query string
-mindate minimum date to retrieve from
-maxdate maximum date to retrieve from
-reldate relative date to retrieve from (days)
-datetype date field to use ('edat' or 'mdat')
-ids array ref of gids (overrides query)
This method creates a new query object. Typically you will specify a
-db and a -query argument, possibly modified by -mindate, -maxdate, or
-reldate. -mindate and -maxdate specify minimum and maximum dates for
entries you are interested in retrieving, expressed in the form
DD/MM/YYYY. -reldate is used to fetch entries that are more recent
than the indicated number of days.
If you provide an array reference of IDs in -ids, the query will be
ignored and the list of IDs will be used when the query is passed to a
Bio::DB::GenBank object's get_Stream_by_query() method. A variety of
IDs are automatically recognized, including GI numbers, Accession
numbers, Accession.version numbers and locus names. |
Title : cookie
Usage : ($cookie,$querynum) = $db->cookie
Function: return the NCBI query cookie
Returns : list of (cookie,querynum)
Args : none
NOTE: this information is used by Bio::DB::GenBank in
conjunction with efetch. |
Title : _request_parameters
Usage : ($method,$base,@params = $db->_request_parameters
Function: return information needed to construct the request
Returns : list of method, url base and key=>value pairs
Args : none |
Title : count
Usage : $count = $db->count;
Function: return count of number of entries retrieved by query
Returns : integer
Args : none
Returns the number of entries that are matched by the query. |
Title : _parse_response
Usage : $db->_parse_response($content)
Function: parse out response
Returns : empty
Args : none
Throws : 'unparseable output exception' |
Methods code
BEGIN { @ATTRIBUTES = qw(db reldate mindate maxdate datetype);
for my $method (@ATTRIBUTES) {
eval <<END
sub $method {
my \$self = shift;
my \$d = \$self->{'_$method'};
\$self->{'_$method'} = shift if \@_;
\$d;
}
END
} | sub new
{ my $class = shift;
my $self = $class->SUPER::new(@_);
my ($query,$db,$reldate,$mindate,$maxdate,$datetype,$ids)
= $self->_rearrange([qw(QUERY DB RELDATE MINDATE MAXDATE DATETYPE IDS)],@_);
$self->db($db || DEFAULT_DB);
$reldate && $self->reldate($reldate);
$mindate && $self->mindate($mindate);
$maxdate && $self->maxdate($maxdate);
$datetype ||= 'mdat';
$datetype && $self->datetype($datetype);
$self;} | sub cookie
{ my $self = shift;
if (@_) {
$self->{'_cookie'} = shift;
$self->{'_querynum'} = shift;
}
else {
$self->_run_query;
@{$self}{qw(_cookie _querynum)};
}} | sub _request_parameters
{ my $self = shift;
my ($method,$base);
my @params = map {eval("\$self->$_") ? ($_ => eval("\$self->$_")) : () } @ATTRIBUTES;
push @params,('usehistory'=>'y','tool'=>'bioperl');
$method = 'get';
$base = ESEARCH;
push @params,('term' => $self->query);
push @params,('retmax' => $self->{'_count'} || MAXENTRY);
($method,$base,@params);} | sub count
{ my $self = shift;
if (@_) {
my $d = $self->{'_count'};
$self->{'_count'} = shift;
return $d;
}
else {
$self->_run_query;
return $self->{'_count'};
}} | sub _parse_response
{ my $self = shift;
my $content = shift;
if (my ($warning) = $content =~ m!<ErrorList>(.+)</ErrorList>!s) {
warn "Warning(s) from GenBank: $warning\n";
}
if (my ($error) = $content =~ /<OutputMessage>([^<]+)/) {
$self->throw("Error from Genbank: $error");
}
my ($count) = $content =~ /<Count>(\d+)/;
my ($max) = $content =~ /<RetMax>(\d+)/;
my $truncated = $count > $max;
$self->count($count);
if (!$truncated) {
my @ids = $content =~ /<Id>(\d+)/g;
$self->ids(\@ids);
}
$self->_truncated($truncated);
my ($cookie) = $content =~ m!<WebEnv>(\S+)</WebEnv>!;
my ($querykey) = $content =~ m!<QueryKey>(\d+)!;
$self->cookie(uri_unescape($cookie),$querykey);} | General documentation
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.
bioperl-l@bioperl.org - General discussion
http://bioperl.org/MailList.shtml - About the mailing lists
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:
bioperl-bugs@bio.perl.org
http://bugzilla.bioperl.org/
| AUTHOR - Lincoln Stein | Top |
The rest of the documentation details each of the
object methods. Internal methods are usually
preceded with a _
Title : ids
Usage : @ids = $db->ids([@ids])
Function: get/set matching ids
Returns : array of sequence ids
Args : (optional) array ref with new set of ids
Title : query
Usage : $query = $db->query([$query])
Function: get/set query string
Returns : string
Args : (optional) new query string