yiiapi/framework/base/CDbStatePersister.php

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<?php
/**
 * CDbStatePersister 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/
 * @package system.base
 * @since 1.1.17
 */

/**
 * CDbStatePersister implements a database persistent data storage.
 *
 * It can be used to keep data available through multiple requests and sessions.
 *
 * By default, CDbStatePersister stores data in a table named 'state'.
 * You may change the location by setting the {@link stateTableName} property.
 *
 * To retrieve the data from CDbStatePersister, call {@link load()}. To save the data,
 * call {@link save()}.
 *
 * Comparison among state persister, session and cache is as follows:
 * <ul>
 * <li>session: data persisting within a single user session.</li>
 * <li>state persister: data persisting through all requests/sessions (e.g. hit counter).</li>
 * <li>cache: volatile and fast storage. It may be used as storage medium for session or state persister.</li>
 * </ul>
 *
 * @package system.base
 * @since 1.1.17
 */
class CDbStatePersister extends CApplicationComponent implements IStatePersister
{
	/**
	 * @var string the database table name storing the state data. Make sure the table
	 * exists or database user is granted to CREATE tables.
	 */
	public $stateTableName='state';
	/**
	 * @var string connection ID
	 */
	public $dbComponent='db';
	/**
	 * @var CDbConnection instance
	 */
	public $db;
	/**
	 * @var string Column name for value-field
	 */
	public $valueField='value';
	/**
	 * @var string Column name for key-field
	 */
	public $keyField='key';


	/**
	 * Initializes the component.