yiiapi/framework/i18n/CDbMessageSource.php

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<?php
/**
 * CDbMessageSource 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/
 */

/**
 * CDbMessageSource represents a message source that stores translated messages in database.
 *
 * The database must contain the following two tables:
 * <pre>
 * CREATE TABLE SourceMessage
 * (
 *     id INTEGER PRIMARY KEY,
 *     category VARCHAR(32),
 *     message TEXT
 * );
 * CREATE TABLE Message
 * (
 *     id INTEGER,
 *     language VARCHAR(16),
 *     translation TEXT,
 *     PRIMARY KEY (id, language),
 *     CONSTRAINT FK_Message_SourceMessage FOREIGN KEY (id)
 *          REFERENCES SourceMessage (id) ON DELETE CASCADE ON UPDATE RESTRICT
 * );
 * </pre>
 * The 'SourceMessage' table stores the messages to be translated, and the 'Message' table
 * stores the translated messages. The name of these two tables can be customized by setting
 * {@link sourceMessageTable} and {@link translatedMessageTable}, respectively.
 *
 * When {@link cachingDuration} is set as a positive number, message translations will be cached.
 *
 * @property CDbConnection $dbConnection The DB connection used for the message source.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.i18n
 * @since 1.0
 */
class CDbMessageSource extends CMessageSource
{
	const CACHE_KEY_PREFIX='Yii.CDbMessageSource.';
	/**
	 * @var string the ID of the database connection application component. Defaults to 'db'.
	 */
	public $connectionID='db';
	/**
	 * @var string the name of the source message table. Defaults to 'SourceMessage'.
	 */
	public $sourceMessageTable='SourceMessage';
	/**
	 * @var string the name of the translated message table. Defaults to 'Message'.
	 */
	public $translatedMessageTable='Message';
	/**
	 * @var integer the time in seconds that the messages can remain valid in cache.