I know this is a simple problem and I am at the limits of my knowledge of utilizing hash references. I create a hash to hold the row elements that will populate an HTML::Template when I push the hash as a reference on the the array I end up with no values in the array.

Awaiting your guidance Mike


Update: Thanks to kyle I have the solution. I will also try to reduce code sample in the future.
Statement that works:

push (@dfdata_out,{device => $dfdata_row{'device'}, 'mount' => $dfdata
+_row{'mount'},
                       'size' => $dfdata_row{'size'}, 'tuse' => $dfdat
+a_row{'tuse'},
                       'yuse' => $dfdata_row{'yuse'}, 'ychange' => $df
+data_row{'ychange'},
                       'wuse' => $dfdata_row{'wuse'}, 'wchange' => $df
+data_row{'wchange'},
                       'muse' => $dfdata_row{'muse'}, 'mchange' => $df
+data_row{'mchange'},
                       'yruse' => $dfdata_row{'yruse'}, 'yrchange' => 
+$dfdata_row{'yrchange'}});
[download]

Statement that does not work but should:

push @dfdata_out, (\%dfdata_row);
[download]

Full code below:

#!/usr/bin/perl
use warnings;
use strict;

use DBI;
use HTML::Template;
use Tie::IxHash;
use Date::Calc qw(Add_Delta_YM Add_Delta_Days Today Month_to_Text);

my ($df_date,$df_device,$df_size, $df_used, $df_available, $df_used_pe
+rcent, $df_mounted);

# Ref Hashes to hold df_data for a date indexed by mount point
my %df_data;
# Flags for no values found - set to false, if true no records found
# ignore compare processing against that time segment.
my ($tdf_flag, $ydf_flag, $lwdf_flag, $lmdf_flag, $lydf_flag) = 0;

my (@today, @yesterday, @last_week, @last_month, @last_year);
my ($tyear, $tmonth, $tday) = @today = Today(); # set values and array
my ($yyear, $ymonth, $yday) = @yesterday = Add_Delta_Days(@today, -1);
my ($lwyear, $lwmonth, $lwday) = @last_week = Add_Delta_Days(@today, -
+7);
my ($lmyear, $lmmonth, $lmday) = @last_month = Add_Delta_YM(@today, 0,
+ -1);
my ($lyyear, $lymonth, $lyday) = @last_year = Add_Delta_YM(@today, -1,
+ 0);
my $ydf_date = $yyear . "-" . Month_to_Text($ymonth) . "-" . $yday;
my $lwdf_date = $lwyear . "-" . Month_to_Text($lwmonth) . "-" . $lwday
+;
my $lmdf_date = $lmyear . "-" . Month_to_Text($lmmonth) . "-" . $lmday
+;
my $lydf_date = $lyyear . "-" . Month_to_Text($lymonth) . "-" . $lyday
+;
$df_date = $tyear . "-" . Month_to_Text($tmonth) . "-" . $tday;
my @dfdata_out = ();
my %dfdata_row;

my %date_hash = (
                'today' => [$df_date,  $tdf_flag, 'tuse', 'tchange'], 
                'yesterday' => [$ydf_date, $ydf_flag, 'yuse', 'ychange
+'],
                'last week' => [$lwdf_date, $lwdf_flag, 'wuse', 'wchan
+ge'],
                'last month' => [$lmdf_date, $lmdf_flag, 'muse', 'mcha
+nge'],
                'last year' => [$lydf_date, $lydf_flag, 'yruse', 'yrch
+ange']);

my $dbname = "/home/mbates/data/df_data.sqlite3";

if ( !-e $dbname ) {
    print "\n File $dbname does not exist, exiting program.\n";
    exit;
}

my $dbconn = "dbi:SQLite:" . $dbname;
my $sth;
my $dbh = DBI->connect( $dbconn,
                       {RaiseError=>1,
                        ShowErrorStatement=>1,
                        PrintError=>1})
                or die "Can't make connection to database: $dbname\n";

eval {
$sth = $dbh->prepare('SELECT * FROM df_data
                        WHERE df_date = ?');
};

if ( $@ ) {
    print "\nError in the database: $@\n";
    exit;
}


for my $key ('today', 'yesterday', 'last week', 'last month', 'last ye
+ar') {
eval {
$sth->execute($date_hash{$key}[0]);

$df_data{$key} = $sth->fetchall_hashref(['df_device']);
};

if ( $@ ) {
    print "\nError in the database: $@\n";
    exit;
}

if ($sth->rows == 0) {
    $date_hash{$key}[1] = 0; # 1 means no records so is false
    #print "No values match date of $df_date \n";
    } else {
    $date_hash{$key}[1] = 1;
    }
}
$dbh->disconnect;
my $template = HTML::Template->new(filename => '/templates/df_report.t
+mpl');
$template->param(RDATE => $df_date);

for my $df_hkey (sort keys %{ $df_data{'today'} } ) {   # Loop on Devi
+ce for today
    # Get base data for today
    $dfdata_row{'device'} = $df_data{'today'}{$df_hkey}{ 'df_device' }
+;
    $dfdata_row{'mount'} = $df_data{'today'}{$df_hkey}{ 'df_mounted' }
+;
    $dfdata_row{'size'} = calc_size_pretty($df_data{'today'}{$df_hkey}
+{ 'df_size' });
    my $suse = calc_size_pretty($df_data{'today'}{$df_hkey}{'df_used'}
+);
    my $savail = calc_size_pretty($df_data{'today'}{$df_hkey}{'df_avai
+lable'});
    $dfdata_row{'tuse'} = $suse . "/" . $savail;
    
    for my $df_hashkey ('yesterday', 'last week', 'last month', 'last 
+year') {
        # if $df_hashkey[1] has a valid value setup information otherw
+ise set to NA
        if ( $date_hash{$df_hashkey}[1] ) {
            $dfdata_row{$date_hash{$df_hashkey}[2]} = 'BA';    
            $dfdata_row{$date_hash{$df_hashkey}[3]} = 'BA'; 
        } else {
            $dfdata_row{$date_hash{$df_hashkey}[2]} = 'NA';
            $dfdata_row{$date_hash{$df_hashkey}[3]} = 'NA';
        }
    
    }
    push (@dfdata_out,{device => $dfdata_row{'device'}, 'mount' => $df
+data_row{'mount'},
                       'size' => $dfdata_row{'size'}, 'tuse' => $dfdat
+a_row{'tuse'},
                       'yuse' => $dfdata_row{'yuse'}, 'ychange' => $df
+data_row{'ychange'},
                       'wuse' => $dfdata_row{'wuse'}, 'wchange' => $df
+data_row{'wchange'},
                       'muse' => $dfdata_row{'muse'}, 'mchange' => $df
+data_row{'mchange'},
                       'yruse' => $dfdata_row{'yruse'}, 'yrchange' => 
+$dfdata_row{'yrchange'}});
    #push @dfdata_out, (\%dfdata_row);
    %dfdata_row = ();
}


$template->param( { rows => \@dfdata_out } );
print $template->output();

sub calc_size_pretty {
    my ($csize) = @_;
    my $new_size;
    if ($csize >= 1024000) {
        return (sprintf ("%.1f", (($csize/(1024*100)) + .05)) . "G");
    } else {
        return (sprintf ("%.1f", (($csize/1024) + .05)) . "M")
    }
}
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