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 my $sth = $dbh->prepare("select tablename from pg_tables where schema
+name=?");
    $sth->execute($schema);
...
        push @tables, @t;
    }
    $sth->finish;

 my %children = (
                  'a' => [ 'b', 'c' ],
...
  sub children { @{$children{$_[0]} || []}; } 
  my @unsorted = ( 'z', 'a', 'x', 'c', 'b', 'y' );
  my @sorted = toposort(\&children, \@unsorted);