/home/edulekha/studygroup.edulekha.com/ow_plugins/forum/bol/post_attachment_dao.php
<?php

/**
 * This software is intended for use with Oxwall Free Community Software http://www.oxwall.org/ and is
 * licensed under The BSD license.

 * ---
 * Copyright (c) 2011, Oxwall Foundation
 * All rights reserved.

 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice, this list of conditions and
 *  the following disclaimer.
 *
 *  - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
 *  the following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 *  - Neither the name of the Oxwall Foundation nor the names of its contributors may be used to endorse or promote products
 *  derived from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * Data Access Object for `forum_post_attachment` table.
 *
 * @author Egor Bulgakov <egor.bulgakov@gmail.com>
 * @package ow.ow_plugins.forum.bol
 * @since 1.0
 */
class FORUM_BOL_PostAttachmentDao extends OW_BaseDao
{

    /**
     * Class constructor
     *
     */
    protected function __construct()
    {
        parent::__construct();
    }
    /**
     * Class instance
     *
     * @var FORUM_BOL_PostAttachmentDao
     */
    private static $classInstance;

    /**
     * Returns class instance
     *
     * @return FORUM_BOL_PostAttachmentDao
     */
    public static function getInstance()
    {
        if ( self::$classInstance === null )
        {
            self::$classInstance = new self();
        }

        return self::$classInstance;
    }

    /**
     * @see OW_BaseDao::getDtoClassName()
     *
     */
    public function getDtoClassName()
    {
        return 'FORUM_BOL_PostAttachment';
    }

    /**
     * @see OW_BaseDao::getTableName()
     *
     */
    public function getTableName()
    {
        return OW_DB_PREFIX . 'forum_post_attachment';
    }

    public function findAttachmentsByPostIdList( $postIds )
    {
        $query = "
            SELECT *
            FROM `" . $this->getTableName() . "`
            WHERE `postId` IN (" . $this->dbo->mergeInClause($postIds) . ")
        ";

        return $this->dbo->queryForList($query);
    }

    public function findAttachmentsByPostId( $postId )
    {
        $query = "
            SELECT *
            FROM `" . $this->getTableName() . "`
            WHERE `postId` = :postId
        ";

        return $this->dbo->queryForList($query, array('postId' => $postId));
    }

    public function getAttachmentsCountByTopicIdList( $topicIds )
    {
        $postDao = FORUM_BOL_PostDao::getInstance();

        $query = "
            SELECT `p`.`topicId`, COUNT(*) AS `attachments`
            FROM `" . $this->getTableName() . "` AS `a`
            LEFT JOIN `" . $postDao->getTableName() . "` AS `p` ON (`a`.`postId`=`p`.`id`)
            WHERE `p`.`topicId` IN (" . $this->dbo->mergeInClause($topicIds) . ")
            GROUP BY `topicId`
        ";

        return $this->dbo->queryForList($query);
    }
}