public function dropView ($name)
		{
			echo "    > drop view $name ...";
			$time = microtime(true);
			$this->db->createCommand('DROP VIEW IF EXISTS ' . $this->db->quoteTableName($name))->execute();
			echo '    > done (time: ' . sprintf('%.3f', microtime(true) - $time) . "s)\n";
		}