X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~yarrgweb/git?p=ypp-sc-tools.main.git;a=blobdiff_plain;f=yarrg%2FCommodsDatabase.pm;fp=yarrg%2FCommodsDatabase.pm;h=6ed0b742f6d3d3f2d9d00c78515de2cb6bc327b6;hp=c51008003b7ef64af5914c96dc9db8d0a8674fd6;hb=84acb589eaec42201d8488eb909e5a6e262ff149;hpb=735a20880b0e6c0b5ad2d62f77f2c3afd0d77ad4

diff --git a/yarrg/CommodsDatabase.pm b/yarrg/CommodsDatabase.pm
index c510080..6ed0b74 100644
--- a/yarrg/CommodsDatabase.pm
+++ b/yarrg/CommodsDatabase.pm
@@ -45,7 +45,8 @@ BEGIN {
     @ISA         = qw(Exporter);
     @EXPORT      = qw(&db_setocean &db_writer &db_connect $dbh
 		      &db_filename &db_doall &db_onconflict
-		      &dbr_filename &dbr_connect &db_connect_core);
+		      &dbr_filename &dbr_connect &db_connect_core
+		      &db_chkcommit &db_check_referential_integrity);
     %EXPORT_TAGS = ( );
 
     @EXPORT_OK   = qw();
@@ -119,4 +120,111 @@ sub db_doall ($) {
     }
 }
 
+#---------- referential integrity constraints ----------
+
+# SQLite doesn't support foreign key constraints so we do it by steam:
+
+sub nooutput ($) {
+    my ($stmts) = @_;
+    my $ekindcount= 0;
+    my $letxt= '';
+    foreach my $stmt (split /\;/, $stmts) {
+	next unless $stmt =~ /\S/;
+
+	my $etxt= '';
+	$stmt =~ s/^([ \t]*\#.*)$/ $etxt .= $1."\n"; ''; /mge;
+	$etxt= $letxt unless length $etxt;
+	$letxt= $etxt;
+	
+	$stmt =~ s/^\s+//; $stmt =~ s/\s+$//;
+	my $sth= $dbh->prepare($stmt);
+	$sth->execute();
+	my $row;
+	my $ecount= 0;
+	my @cols= @{ $sth->{NAME_lc} };
+	my $w= 11;
+	while ($row= $sth->fetchrow_hashref) {
+	    if (!$ecount++) {
+		print STDERR "REFERENTIAL INTEGRITY ERROR\n";
+		print STDERR "\n$etxt\n $stmt\n\n";
+		printf STDERR "|%-${w}s", $_ foreach @cols; print STDERR "|\n";
+		print STDERR "+",('-'x$w)  foreach @cols; print STDERR "+\n";
+	    }
+	    if ($ecount>5) { print STDERR "...\n"; last; }
+	    printf STDERR "|%-$w.${w}s",
+	        (defined $row->{$_} ? $row->{$_} : 'NULL')
+		    foreach @cols;
+	    print STDERR "\n";
+	}
+	next unless $ecount;
+	
+	$ekindcount++;
+	print STDERR "\n\n";
+    }
+    die "REFERENTIAL INTEGRITY ERRORS $ekindcount\n"
+	if $ekindcount;
+}
+
+sub db_check_referential_integrity () {
+    foreach my $bs (qw(buy sell)) {
+	nooutput(<<END);
+
+ # Every buy/sell must refer to an entry in commods, islands, and stalls:
+ SELECT * FROM $bs NATURAL LEFT JOIN commods WHERE commodname IS NULL;
+ SELECT * FROM $bs NATURAL LEFT JOIN islands WHERE islandname IS NULL;
+ SELECT * FROM $bs LEFT JOIN STALLS USING (stallid) WHERE stallname IS NULL;
+
+ # Every buy/sell must be part of an upload:
+ SELECT * FROM $bs NATURAL LEFT JOIN uploads WHERE timestamp IS NULL;
+
+ # The islandid in stalls must be the same as the islandid in buy/sell:
+ SELECT * FROM $bs JOIN stalls USING (stallid)
+	WHERE $bs.islandid != stalls.islandid;
+
+END
+    }
+    foreach my $end (qw(aiid biid)) {
+	foreach my $tab (qw(dists routes)) {
+	    nooutput(<<END);
+
+ # Every row in dists and routes must refer to two existing rows in islands:
+ SELECT * FROM $tab d LEFT JOIN islands ON (d.$end=islandid)
+	WHERE islandname IS NULL;
+
+END
+	}
+    }
+    nooutput(<<END);
+
+ # Every pair of islands must have an entry in dists:
+ SELECT * FROM islands ia JOIN islands ib LEFT JOIN dists
+	ON (ia.islandid=aiid and ib.islandid=biid)
+	WHERE dist IS NULL;
+
+ # Every stall and upload must refer to an island:
+ SELECT * FROM stalls NATURAL LEFT JOIN islands WHERE islandname IS NULL;
+ SELECT * FROM uploads NATURAL LEFT JOIN islands WHERE islandname IS NULL;
+
+ # Every commod which refers to a commodclass refers to an existing one:
+ SELECT * FROM commods WHERE commodclass NOT IN
+	(SELECT commodclass FROM commodclasses);
+
+ # There are no empty commodclasses:
+ SELECT * FROM commodclasses NATURAL LEFT JOIN commods
+	WHERE commodname IS NULL;
+
+ # Ordvals which are not zero are unique:
+ SELECT ordval,count(*) FROM COMMODS
+	WHERE ordval IS NOT NULL AND ordval != 0
+	GROUP BY ordval
+	HAVING count(*) > 1;
+
+END
+}
+
+sub db_chkcommit () {
+    db_check_referential_integrity();
+    $dbh->commit();
+}
+
 1;