1. 关于在css中使用control flow.

 #container{
            <% IF need_sample %>
            width: 800px;
            <% ELSE %>
            width: 500px;
            <% END %>
 }

2.  对于Perl里的DBI模块， 有以下的routine：

$dbh - DBI->connect();
die("Failed to connect to the DB\n") unless $dbh;
$query = "select ....";
$sth = $dbh->prepare($query);
$sth->execute();
while (my ($mid) = $sth->fetchrow_array()) {
  $cl{$mid}++;
}
$sth->finish();