public function touch($key) {
		if (isset($this->fieldConf[$key])
			&& isset($this->fieldConf[$key]['type'])) {
			$type = $this->fieldConf[$key]['type'];
			$date = ($this->dbsType=='sql' && preg_match('/mssql|sybase|dblib|odbc|sqlsrv/',
				$this->db->driver())) ? 'Ymd' : 'Y-m-d';
			if ($type == Schema::DT_DATETIME || $type == Schema::DT_TIMESTAMP)
				$this->set($key,date($date.' H:i:s'));
			elseif ($type == Schema::DT_DATE)
				$this->set($key,date($date));
			elseif ($type == Schema::DT_INT4)
				$this->set($key,time());
		}
	}