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Re: How do I create a sort sub on-the-fly?

by jeroenes (Priest)
on Nov 02, 2001 at 15:15 UTC ( #122780=note: print w/replies, xml ) Need Help??

in reply to How do I create a sort sub on-the-fly?

I would avoid writing such elaborate sorting subs and use DBD::RAM. This is the first timer for me, BTW.

This is yet untested tested now:

use DBI; use SuperSplit; my $data; { local $/ = undef; $data = <DATA>; } $data=~tr/\-/,/; my $dbh = DBI->connect('DBI:RAM:','usr','pwd',{RaiseError=>1}); $dbh->func({ table_name => 'file', col_names => 'source,year,month,time,sip,sport,dip,dport,hits, +acl,mlnum', data_type => 'CSV', data_source => $data, }, 'import' ); my $ar = $dbh->selectall_arrayref(qq[SELECT * FROM file ORDER by spo +rt asc, time desc ]); print superjoin(',',"\n", $ar ); __DATA__ Monmouth,2000-05-2000:00:09-04,,138,192.100.255,66,2,105,1 +234 Jackson,2000-04-2100:00:10-05,,144,192.67.29,134,8,101,148 +7 Meade,2001-01-0500:00:11-04,213.132.32,175,,151,12,107,153 +2 Yuma,200-03-1100:00:12-05,,156,,156,10,105,1578 Monmouth,200-04-1000:00:10-08,,125,,159,16,101,1879 Lewis,2000-03-1200:21:45-32,,144,192.67.29,134,32,107,1487 Hero,2001-01-0500:00:11-04,,132,,151,12,101,15 +32 Jackson,2000-01-0500:00:11-04,,175,,151,14,105, +153
Of course you will have to write your own sorts here, but that is fairly easy now, just adjust the SQL ORDER string.


"We are not alone"(FZ)

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Re: Re: How do I create a sort sub on-the-fly?
by pope (Friar) on Nov 02, 2001 at 16:45 UTC
    Perhaps you mean DBD::AnyData? DBD::RAM is obsoleted by this one.

    Anyway, you've showed an interesting way to treat the problem as DBI query! ++ for that! (DBD::CSV should do it, too)

      I had no idea that DBD:RAM was obsoleted. I remembered some merlyn-WT with it, so I just installed it to try. Will check out DBD::Anydata of course... thanks.

      Update I got back at my root 'konsole' and found that anaydata failed the tests.. is that a known bug? ... i tried and tried... AnayData actually hangs on the.... I also tried cpan://Anydata... to no avail.

        No, it should pass all tests. It requires AnyData. It just behaves a little bit different from DBD::CSV when dealing with CSV data. It seems to expect that all non null fields to be escaped properly, which is not the case with DBD::CSV where a field needs escapes only when it is necessary. I was bitten by this quirk once.
      I think DBD::RAM uses DBD::CSV internally.
Re: Re: How do I create a sort sub on-the-fly?
by CharlesClarkson (Curate) on Nov 06, 2001 at 10:23 UTC

    I originally used Sort::Fields to create the report, but as I mention below most beginners don't like to use modules outside the standard ones.

    #!/usr/bin/perl use strict; use diagnostics; use Sort::Fields; my (@records, @report); { my $data_file = 'test.dat'; open my $fh, $data_file or die "Can't open $data_file: $!"; while (<$fh>) { # skip blank and commented lines next if /^\s*#/; next if /^\s*$/; # We'll look for lines that describe a report: if (/report:\s+sort\s+(\S*)/ ) { @report = split /,/, $1; next; } push @records, $_; } } my (@columns, @sort_description); { my %field = ( source => 1, time => 2, sip => 3, sport => 4, dip => 5, dport => 6, hits => 7, acl => 8, lnum => 9 ); foreach (@report) { my ($name, $order) = split /-/; my $suffix = $name =~ /source|time/ ? '' : 'n'; if ($order eq 'd') { push @sort_description, "$name:\t\tdescending\n"; push @columns, "-$field{$name}$suffix"; } else { push @sort_description, "$name:\t\tascending\n"; push @columns, "$field{$name}$suffix"; } } } { ### store report data in file my $report_file_name = "out.txt"; open my $fh, '>', $report_file_name or die "Can't Open $report_file_name: $!"; my $date = localtime; $date =~ s/ /-/g; print $fh qq|\t\tREQUEST FOR SORTING\n\n|, @sort_description, qq|\n\nFILE WAS GENERATED ON: $date\n\n|, fieldsort ',', \@columns, @records; } __END__

    Thanks for your reply,
    Charles K. Clarkson

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