protected function _createUpdateValues($array) {
		$values = [];
		$tokens = [];
		
		// divide normal values from function calls
		foreach ($array as $key => $value) {
			if (is_array($value)) {
				$tokens[] = '`'.$key.'`='.$value['FUNC'];
			} else {
				$tokens[] = '`'.$key.'`=?';
				$values[] = $value;
			}
		}
		
		$tokens = implode(', ', $tokens);	

		$returner = compact('tokens', 'values');
		return $returner;
	}