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Re^5: Parsing an SQL table using an array of hashes?

by poj (Priest)
on Jul 02, 2013 at 20:52 UTC ( #1042108=note: print w/ replies, xml ) Need Help??


in reply to Re^4: Parsing an SQL table using an array of hashes?
in thread Parsing an SQL table using an array of hashes?

Little more complicated because you have to define an order for the categories, I have chosen a alphabetic sort.

#perl use strict; use GD::Graph; use GD::Graph::bars; my $YEAR1 = 2013; my @period=(); my %y_data=(); my @x_legend=(); my %x_data=(); # store data while (<DATA>){ chomp; my ($m,$y,$cat,$n) = split ',',$_; # convert year/month to period number my $pd = ym_to_pd($y,$m); $period[$pd] = "$m/$y"; $y_data{$cat}[$pd] = $n; ++$x_data{$pd}; } # graph data my @y_plotdata; my @categories = sort keys %y_data; push @y_plotdata,[@categories]; for my $pd (sort {$a<=>$b} keys %x_data){ push @x_legend,$period[$pd]; my @y_data=(); for my $cat (@categories){ push @y_data,$y_data{$cat}[$pd]; } push @y_plotdata,[ @y_data ]; } # create graph my $my_graph = GD::Graph::bars->new(800,600); $my_graph->set( x_label => 'X Label', y_label => 'Y label', title => 'Title', ); $my_graph->set_legend(@x_legend); my $img = $my_graph->plot(\@y_plotdata) or die $my_graph->error; # save image open(IMG,'>','plot.gif') or die "$!"; binmode IMG; print IMG $img->png; close IMG; # convert year,month to period sub ym_to_pd { my ($yr,$mth) = @_; return ($yr - $YEAR1) * 12 + $mth; } # convert period to year.month sub pd_to_ym { my $ix = shift; my $yr = int(($ix-1)/12)+$YEAR1; my $mth = $ix-12*($yr-$YEAR1); return ($yr,$mth); } #test_periods(); sub test_periods { for my $y (2013..2015){ for my $m (1..12){ my $pd = ym_to_pd($y,$m); my ($yr,$mth) = pd_to_ym($pd); print "$y $m => $pd => $yr $mth\n"; } } } __DATA__ 3,2013,Address,1 2,2013,Equipment,13 3,2013,Equipment,18 4,2013,Equipment,17 5,2013,Equipment,8 3,2013,Database Reconciliation,3 5,2013,Database Reconciliation,3 2,2013,Design/Process,123 3,2013,Design/Process,74 4,2013,Design/Process,42 5,2013,Design/Process,30 1,2014,Design/Process,30
Updated : period loop uses new %x_data :
for my $pd (sort {$a<=>$b} keys %x_data){ push @x_legend,$period[$pd];
poj


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