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Re: Unlimited groups/categories

by friedo (Prior)
on Jun 01, 2008 at 01:48 UTC ( #689484=note: print w/replies, xml ) Need Help??


in reply to Unlimited groups/categories

For trivial tree-processing problems, a recursive solution is generally easiest. This might not be the best way if your tree is truly gigantic, but it should work in most cases. This is untested but should get you on the right track:

my $dbh = ... # set up database sub display_groups { my ( $parent, $level ) = @_; # get all children of this parent my $sth = $dbh->prepare("SELECT id, gname FROM groups WHERE subgroup=? ORDER BY gname"); $sth->execute( $parent ); # display each child and its descendants while( my $row = $sth->fetchrow_hashref ) { print " " x $level; # indent print $row->{gname}, "\n"; display_groups( $row->{id}, $level + 1 ); } } # start with children of group 0 display_groups( 0, 0 );

Update: Added ORDER BY clause.

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[shmem]: that's why it is called "Windows"
[stevieb]: shmem thanks for the 'insight' :P
[shmem]: good thing that Sun already took "OpenWindows", otherwise I'd not stop to shudder imagining an "OpenWindows" from MS
[shmem]: more garbage in, more garbage out that would be
[stevieb]: I found that win10 broke a C# library I was using for one project while enhancing tests for a Perl dist, which breaks other Perl dists, and I'm about to throw my hands up on berrybrew. win2k12 broke one thing, win10 breaks something...
[stevieb]: ...unrelated which requires replacing a lot of code and a whole lib. I'm about to go nix only ffs
[shmem]: stevieb: what you're doing sounds afwully complex. Too much for me this evening to provide brighter insight ;-)
[stevieb]: I don't even own a Windows computer. Both my girl and I have a laptop each with Linux. I'm supporting Windows in some of my projects and I can't even guage whether it's worth it or not.
[stevieb]: shmem It's something I desired to have years ago, which is why I took over berrybrew. Cross-platform build/test automation locally, or over the network Test::BrewBuild

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