[Bioperl-l] Problem: Can't call method "features" on an undefined value at BIO::DB::GFF.pl
hangsyin at gmail.com
Sun Jan 20 10:08:59 EST 2008
I tried to change sequence-region line to "4 FlyBase chromosome_arm 1
1351857 . . . ID=4;Name=4", it doesn't work. "$!" didn't say anything but
"died at line 12".
So, I went ahead with the Bio::DB::SeqFeature::Store. Here is my code to
load the dmel-all-r5.4.gff(from Flybase) to a test database:
my $db = Bio::DB::SeqFeature::Store->new(-adaptor => 'DBI::mysql',
-dsn => 'dbi:mysql:test',
-user => 'root',
-pass => 'XXXXX',
-write => 1 );
my $loader = Bio::DB::SeqFeature::Store::GFF3Loader->new(-store => $db,
-verbose => 1);
I got bunch of errors like this:
"DBD::mysql::execute failed: Table 'test.locationlist' doesn't exist at
C:\Biology\perl\site\lib\Bio\DB\SeqFeature\Store\DBI\mysql.pm line 1316".
The line 1316 in mysql.pm looks like this: $sth->execute($name) or die
I checked the database test after failed loading. There is only one table
created, which call 'meta'. I also tried 'grant all on test to
XXX at localhost' and used that -user and -pass to load gff, it didn't work
Scott Cain-3 wrote:
> Hi Jon,
> Well, seeing the error message would be helpful, but my first guess
> without is that there are a few things you can try:
> * removing the "sequence-region" line from the GFF file, adding a line
> like this:
> 4 FlyBase chromosome_arm 1 1351857 . . . ID=4;Name=4
> and then reloading the database.
> * Or, you may want to consider using Bio::DB::SeqFeature::Store, since
> Bio::DB::GFF3 doesn't always behave correctly with complex GFF3 (that
> is, with three levels of features (like gene, mRNA and CDS)).
> On Sat, 2008-01-19 at 19:49 -0800, Hang wrote:
>> Hi, Scott,
>> After adding die $!, I know something is wrong at line:
>> "my $segment = $db->segment(-name => '4', -start => 20000, -end =>
>> my gff file is like this:
>> ##gff-version 3
>> ##sequence-region 4 1 1351857
>> 4 FlyBase transposable_element 2 611 . + .
>> 4 repeatmasker_dummy match 2 347 . + .
>> 4 repeatmasker_dummy match_part 2 347 2367 + .
>> 5860 6210 +;
>> I really got confused. Any further suggestion? Thank you!
>> Scott Cain-3 wrote:
>> > Hi Jon,
>> > I think it's funny that you have "or die" on the database opening line,
>> > "or die" on the @features line, but you didn't put one on the $segment
>> > line. Try adding "or die: $!" to the $segment line to see what it
>> > also add a 'print $segment' after you create it and before you try to
>> > get the features from it.
>> > Clearly, the problem is that $segment is not defined (that is, nothing
>> > is in it, not that the wrong thing is in it). The next trick is to
>> > out why. My first guess, without looking at the data set, is that the
>> > arm is not really named '4'.
>> > Scott
>> > On Sat, 2008-01-19 at 10:25 -0800, Hang wrote:
>> >> Hi, everyone,
>> >> I met this problem when I was running this script to extract features
>> >> overlaps with 4:20,000..25,000. It always responds like "Can't call
>> >> method
>> >> "features" on an undefined value at BIO::DB::GFF.pl line XX".
>> >> ==============================================================
>> >> use Bio::DB::GFF;
>> >> use Bio::Tools::GFF;
>> >> my $db = Bio::DB::GFF->new(-adaptor => 'dbi::mysql',
>> >> -dsn =>
>> >> 'dbi:mysql:dmel_gff:localhost',
>> >> -user => 'XXXX',
>> >> -pass => 'XXXX') || die
>> >> open failed";
>> >> my $segment = $db->segment(-name => '4', -start => 20000, -end =>
>> >> my @features = $segment->features(-types => ['gene', 'exon', 'intron',
>> >> 'five_prime_UTR', 'three_prime_UTR', 'CDS']) or die "no features";
>> >> print(scalar(@features)."\n");
>> >> ================================================================
>> >> I am using activeperl 5.8.8 and bioperl 1.5.2 under Win32. I loaded
>> >> dmel_5.4.gff into mysql database by bulk_load_gff.pl without any
>> >> Other methods failed also.
>> >> Any help will be deeply appreciated!
>> >> Best,
>> >> Jon
>> > --
>> > Scott Cain, Ph. D.
>> cain at cshl.edu
>> > GMOD Coordinator (http://www.gmod.org/)
>> > Cold Spring Harbor Laboratory
>> > _______________________________________________
>> > Bioperl-l mailing list
>> > Bioperl-l at lists.open-bio.org
>> > http://lists.open-bio.org/mailman/listinfo/bioperl-l
> Scott Cain, Ph. D. cain at cshl.edu
> GMOD Coordinator (http://www.gmod.org/) 216-392-3087
> Cold Spring Harbor Laboratory
> Bioperl-l mailing list
> Bioperl-l at lists.open-bio.org
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