my $qa= \%ARGS;
</%perl>
-<h1>Select commodity enquiry</h1>
+<h1>Commodity enquiry</h1>
% $prselector->('BuySell');
foreach my $bs (split /_/, $ARGS{BuySell}) {
$bs =~ m/^(buy|sell)$/ or die;
$bs= $1;
+ my ($ascdesc) = ($bs eq 'buy')
+ ? ('DESC')
+ : ('ASC');
+#INNER JOIN
+ my $islands= $dbh->prepare(
+ "SELECT islands.islandid AS islandid, archipelago, islandname,
+ sum(qty) as tqty
+ FROM islands LEFT OUTER JOIN $bs offers
+ ON islands.islandid == offers.islandid AND commodid == ?
+ GROUP BY islands.islandid,
+ ORDER BY archipelago, islandname"
+ );
- my $sth= $dbh->prepare(
- "SELECT archipelago, islandname, stallname, price, qty
- FROM $bs NATURAL JOIN stalls NATURAL JOIN islands
- WHERE commodid = ?"
+ my $offers= $dbh->prepare(
+ "SELECT stallname, price, qty
+ FROM $bs NATURAL JOIN stalls
+ WHERE commodid = ? AND islandid = ?
+ ORDER BY price $ascdesc"
);
# fixme this query is utterly wrong
- $sth->execute($commodid);
-
</%perl>
<h2>Offers to <% uc $bs |h %> <% $commodname |h %></h2>
<table>
<tr>
+<th colspan=3>
+<th colspan=2>Prices
+<th colspan=3>Quantities available
+<tr>
<th>Archipelago
<th>Island
-<th>Best stall
-<th>Best price
-<th>Qty at best
+<th>Unique best stall
+<th>Best
+<th>Median
+<th>At best
+<th>Within 10%
+<th>Total
</tr>
-% my $row;
-% while ($row=$sth->fetchrow_hashref) {
-<tr> <td><% $row->{'archipelago'} %>
- <td><% $row->{'islandname'} %>
- <td><% $row->{'stallname'} %>
- <td><% $row->{'price'} %>
- <td><% $row->{'qty'} %>
+% $islands->execute($commodid);
+% my $island;
+% while ($island= $islands->fetchrow_hashref) {
+% my $islandid= $island->{'islandid'};
+% $offers->execute($commodid, $islandid);
+% my ($offer, $bestprice, $marginal, @beststalls);
+% my $tqty= $island->{'tqty'};
+% my $cqty= '';
+% my $bestqty= '';
+% my $approxqty= '';
+% my $median= '-';
+% while ($offer= $offers->fetchrow_hashref) {
+% my $price= $offer->{'price'};
+% my $qty= $offer->{'qty'};
+% length $bestqty or $bestprice= $price;
+% if ($price == $bestprice) {
+% $bestqty += $qty;
+% push @beststalls, $offer->{'stallname'};
+% }
+% $cqty += $qty;
+% if ($cqty*2 >= $tqty && $median eq '-') {
+% $median= $price;
+% }
+% if ($bestprice*9 <= $price*10 and
+% $price*10 <= $bestprice*11) {
+% $approxqty += $qty;
+% }
+% }
+% my $nstalls= @beststalls;
+% $cqty == $tqty or die "$bs $cqty $tqty $commodid $islandid ";
+<tr> <td><% $island->{'archipelago'} |h %>
+ <td><% $island->{'islandname'} |h %>
+ <td><% $nstalls==0 ? '-' :
+ $nstalls==1 ? $beststalls[0] : "$nstalls offers" |h %>
+ <td><% length $bestqty ? $bestprice : '-' %>
+ <td><% $median %>
+ <td><% $bestqty %>
+ <td><% $approxqty %>
+ <td><% $cqty %>
</tr>
% }
</table>