+#========== database handling ==========
+
+sub database_fetch_ocean () {
+ my ($row,$sth);
+ $sth= $dbh->prepare('SELECT islandname, archipelago FROM islands');
+ $sth->execute();
+ undef %dbisland2arch;
+ $dbdists= Graph::Undirected->new();
+ while ($row= $sth->fetchrow_hashref) {
+ print DEBUG "database-island $row->{'islandname'}".
+ " $row->{'archipelago'}\n";
+ $dbisland2arch{$row->{'islandname'}}= $row->{'archipelago'};
+ }
+ $sth= $dbh->prepare('SELECT dist, a.islandname a, b.islandname b
+ FROM dists
+ JOIN islands AS a ON dists.aiid==a.islandid
+ JOIN islands AS b ON dists.biid==b.islandid');
+ $sth->execute();
+ while ($row= $sth->fetchrow_hashref) {
+ $dbdists->add_weighted_edge($row->{'a'}, $row->{'b'}, $row->{'dist'});
+ }
+}
+
+sub database_graph_spr () {
+ $dbspr= shortest_path_reduction('db',$dbdists);
+}
+
+sub database_do_updates () {
+ my $addisland= $dbh->prepare(<<'END')
+ INSERT OR IGNORE INTO islands (islandname, archipelago) VALUES (?, ?);
+END
+ ;
+ foreach my $island (sort keys %wiisland2node) {
+ my $wiarch= wiisland2arch($island);
+ $addisland->execute($island, $wiarch);
+ }
+
+ db_doall(<<END)
+ DELETE FROM dists;
+ DELETE FROM routes;
+END
+ ;
+ my $adddist= $dbh->prepare(<<'END')
+ INSERT INTO dists VALUES
+ ((SELECT islandid FROM islands WHERE islandname == ?),
+ (SELECT islandid FROM islands WHERE islandname == ?),
+ ?);
+END
+ ;
+ my $addroute= $dbh->prepare(<<'END')
+ INSERT INTO routes VALUES
+ ((SELECT islandid FROM islands WHERE islandname == ?),
+ (SELECT islandid FROM islands WHERE islandname == ?),
+ ?);
+END
+ ;
+ foreach my $ia (sort keys %wiisland2node) {
+ my $na= $wiisland2node{$ia};
+ foreach my $ib (sort keys %wiisland2node) {
+ my $nb= $wiisland2node{$ib};
+ my $apdist= $ia eq $ib ? 0 : widist($na,$nb);
+ die "$ia $ib" unless defined $apdist;
+ my $sprdist= $wispr->get_edge_weight($ia,$ib);
+ die "$ia $ib $apdist $sprdist" if
+ defined($sprdist) && $sprdist != $apdist;
+
+ $adddist->execute($ia,$ib,$apdist);
+ $addroute->execute($ia,$ib,$sprdist) if defined $sprdist;
+ }
+ }
+
+ # select ia.islandname, ib.islandname, d.dist from dists as d, islands as ia on d.aiid = ia.islandid, islands as ib on d.biid = ib.islandid order by ia.islandname, ib.islandname;
+
+}
+
+#========== update _ocean-*.txt ==========
+
+our $localtopo_path;
+
+sub localtopo_rewrite () {
+ $localtopo_path= '_ocean-'.(lc $ocean).'.txt';
+ my $fh= new IO::File "$localtopo_path.tmp", 'w';
+ print $fh "# autogenerated - do not edit\n" or die $!;
+ print $fh "ocean $ocean\n" or die $!;
+ my %arches;
+ foreach my $isle (sort keys %wtisland2arch) {
+ my $arch= $wtisland2arch{$isle};
+ push @{ $arches{$arch} }, $isle;
+ }
+ foreach my $arch (sort keys %arches) {
+ print $fh " $arch\n" or die $!;
+ foreach my $isle (@{ $arches{$arch} }) {
+ print $fh " $isle\n" or die $!;
+ }
+ }
+ print $fh "\n" or die $!;
+ close $fh or die $!;
+}
+
+sub localtopo_commit () {
+ rename "$localtopo_path.tmp", $localtopo_path or die $!;
+}
+
+#========== main program ==========
+