public static function prepareQuery(array &$options=array(), &$instance=null, $IDField=null) {
		self::prepareInstance($instance);
		self::$instances[$instance]->setIDField($IDField);
		if( !empty($options) && !empty($options['output']) && $options['output'] == SQLAdapter::ARR_FIRST ) {
			$options['number'] = 1;
		}
	}