<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
namespace phpbb\db\migration\data\v32x;
class user_notifications_table_remove_duplicates extends \phpbb\db\migration\migration
{
static public function depends_on()
{
return array(
'\phpbb\db\migration\data\v32x\user_notifications_table_temp_index',
);
}
public function update_data()
{
return array(
array('custom', array(array($this, 'remove_duplicates'))),
);
}
public function remove_duplicates()
{
$insert_buffer = new \phpbb\db\sql_insert_buffer($this->db, $this->table_prefix . 'user_notifications');
$sql = "SELECT item_type, item_id, user_id, method, MAX(notify) AS notify
FROM {$this->table_prefix}user_notifications
GROUP BY item_type, item_id, user_id, method
HAVING COUNT(item_type) > 1";
$result = $this->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
// Delete the duplicate entries
$this->sql_query("DELETE FROM {$this->table_prefix}user_notifications
WHERE user_id = {$row['user_id']}
AND item_type = '{$row['item_type']}'
AND method = '{$row['method']}'");
// And re-insert as a single one
$insert_buffer->insert($row);
}
$this->db->sql_freeresult($result);
}
}