yiiapi/framework/web/CSort.php

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<?php
/**
 * CSort class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright 2008-2013 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CSort represents information relevant to sorting.
 *
 * When data needs to be sorted according to one or several attributes,
 * we can use CSort to represent the sorting information and generate
 * appropriate hyperlinks that can lead to sort actions.
 *
 * CSort is designed to be used together with {@link CActiveRecord}.
 * When creating a CSort instance, you need to specify {@link modelClass}.
 * You can use CSort to generate hyperlinks by calling {@link link}.
 * You can also use CSort to modify a {@link CDbCriteria} instance by calling {@link applyOrder} so that
 * it can cause the query results to be sorted according to the specified
 * attributes.
 *
 * In order to prevent SQL injection attacks, CSort ensures that only valid model attributes
 * can be sorted. This is determined based on {@link modelClass} and {@link attributes}.
 * When {@link attributes} is not set, all attributes belonging to {@link modelClass}
 * can be sorted. When {@link attributes} is set, only those attributes declared in the property
 * can be sorted.
 *
 * By configuring {@link attributes}, one can perform more complex sorts that may
 * consist of things like compound attributes (e.g. sort based on the combination of
 * first name and last name of users).
 *
 * The property {@link attributes} should be an array of key-value pairs, where the keys
 * represent the attribute names, while the values represent the virtual attribute definitions.
 * For more details, please check the documentation about {@link attributes}.
 *
 * @property string $orderBy The order-by columns represented by this sort object.
 * This can be put in the ORDER BY clause of a SQL statement.
 * @property array $directions Sort directions indexed by attribute names.
 * The sort direction. Can be either CSort::SORT_ASC for ascending order or
 * CSort::SORT_DESC for descending order.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.web
 */
class CSort extends CComponent
{
	/**
	 * Sort ascending
	 * @since 1.1.10
	 */
	const SORT_ASC = false;

	/**
	 * Sort descending
	 * @since 1.1.10
	 */
	const SORT_DESC = true;