Sync.php

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<?php
/*
 You may not change or alter any portion of this comment or credits
 of supporting developers from this source code or any supporting source code
 which is considered copyrighted (c) material of the original comment or credit authors.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/

namespace Xoops\Core\Kernel\Model;

use Xoops\Core\Kernel\XoopsModelAbstract;

class Sync extends XoopsModelAbstract
{
    public function cleanOrphan($table_link = '', $field_link = '', $field_object = '')
    {
        if (!empty($table_link)) {
            $this->handler->table_link = $table_link;
        }
        if (!empty($field_link)) {
            $this->handler->field_link = $field_link;
        }
        if (!empty($field_object)) {
            $this->handler->field_object = $field_object;
        }

        if (empty($this->handler->field_object)
            || empty($this->handler->table_link)
            || empty($this->handler->field_link)
        ) {
            trigger_error(
                "The link information is not set for '" . get_class($this->handler) . "' yet.",
                E_USER_WARNING
            );
            return false;
        }

        // there were two versions of this sql, first for mysql 4.1+ and
        // the second for earlier versions.
        // TODO: Need to analyse and find the most portable query to use here
        /*
        $sql = "DELETE FROM `{$this->handler->table}`"
            . " WHERE (`{$this->handler->field_object}` NOT IN "
            . "( SELECT DISTINCT `{$this->handler->field_link}` FROM `{$this->handler->table_link}`) )";
        */
        $sql = "DELETE `{$this->handler->table}` FROM `{$this->handler->table}`"
            . " LEFT JOIN `{$this->handler->table_link}` AS aa "
            . " ON `{$this->handler->table}`.`{$this->handler->field_object}` = aa.`{$this->handler->field_link}`"
            . " WHERE (aa.`{$this->handler->field_link}` IS NULL)";

        return $this->handler->db2->executeUpdate($sql);
    }
}