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<?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.

*

*/

/**

* @ignore

*/

if (!defined('IN_PHPBB'))

{

exit;

}

/**

* Updates rows in given table from a set of values to a new value.

* If this results in rows violating uniqueness constraints, the duplicate

* rows are eliminated.

*

* The only supported table is bookmarks.

*

* @param \phpbb\db\driver\driver_interface $db Database object

* @param string $table Table on which to perform the update

* @param string $column Column whose values to change

* @param array $from_values An array of values that should be changed

* @param int $to_value The new value

* @return null

*/

function phpbb_update_rows_avoiding_duplicates(\phpbb\db\driver\driver_interface $db, $table, $column, $from_values, $to_value)

{

$sql = "SELECT $column, user_id

FROM $table

WHERE " . $db->sql_in_set($column, $from_values);

$result = $db->sql_query($sql);

$old_user_ids = array();

while ($row = $db->sql_fetchrow($result))

{

$old_user_ids[$row[$column]][] = (int) $row['user_id'];

}

$db->sql_freeresult($result);

$sql = "SELECT $column, user_id

FROM $table

WHERE $column = " . (int) $to_value;

$result = $db->sql_query($sql);

$new_user_ids = array();

while ($row = $db->sql_fetchrow($result))

{

$new_user_ids[$row[$column]][] = (int) $row['user_id'];

}

$db->sql_freeresult($result);

$queries = array();

foreach ($from_values as $from_value)

{

if (!isset($old_user_ids[$from_value]))

{

continue;

}

if (empty($new_user_ids))

{

$sql = "UPDATE $table

SET $column = " . (int) $to_value . "

WHERE $column = '" . $db->sql_escape($from_value) . "'";

$queries[] = $sql;

}

else

{

$different_user_ids = array_diff($old_user_ids[$from_value], $new_user_ids[$to_value]);

if (!empty($different_user_ids))

{

$sql = "UPDATE $table

SET $column = " . (int) $to_value . "

WHERE $column = '" . $db->sql_escape($from_value) . "'

AND " . $db->sql_in_set('user_id', $different_user_ids);

$queries[] = $sql;

}

}

}

if (!empty($queries))

{

$db->sql_transaction('begin');

foreach ($queries as $sql)

{

$db->sql_query($sql);

}

$sql = "DELETE FROM $table

WHERE " . $db->sql_in_set($column, $from_values);

$db->sql_query($sql);

$db->sql_transaction('commit');

}

}

/**

* Updates rows in given table from a set of values to a new value.

* If this results in rows violating uniqueness constraints, the duplicate

* rows are merged respecting notify_status (0 takes precedence over 1).

*

* The only supported table is topics_watch.

*

* @param \phpbb\db\driver\driver_interface $db Database object

* @param string $table Table on which to perform the update

* @param string $column Column whose values to change

* @param array $from_values An array of values that should be changed

* @param int $to_value The new value

* @return null

*/

function phpbb_update_rows_avoiding_duplicates_notify_status(\phpbb\db\driver\driver_interface $db, $table, $column, $from_values, $to_value)

{

$sql = "SELECT $column, user_id, notify_status

FROM $table

WHERE " . $db->sql_in_set($column, $from_values);

$result = $db->sql_query($sql);

$old_user_ids = array();

while ($row = $db->sql_fetchrow($result))

{

$old_user_ids[(int) $row['notify_status']][$row[$column]][] = (int) $row['user_id'];

}

$db->sql_freeresult($result);

$sql = "SELECT $column, user_id

FROM $table

WHERE $column = " . (int) $to_value;

$result = $db->sql_query($sql);

$new_user_ids = array();

while ($row = $db->sql_fetchrow($result))

{

$new_user_ids[$row[$column]][] = (int) $row['user_id'];

}

$db->sql_freeresult($result);

$queries = array();

$extra_updates = array(

0 => 'notify_status = 0',

1 => '',

);

foreach ($from_values as $from_value)

{

foreach ($extra_updates as $notify_status => $extra_update)

{

if (!isset($old_user_ids[$notify_status][$from_value]))

{

continue;

}

if (empty($new_user_ids))

{

$sql = "UPDATE $table

SET $column = " . (int) $to_value . "

WHERE $column = '" . $db->sql_escape($from_value) . "'";

$queries[] = $sql;

}

else

{

$different_user_ids = array_diff($old_user_ids[$notify_status][$from_value], $new_user_ids[$to_value]);

if (!empty($different_user_ids))

{

$sql = "UPDATE $table

SET $column = " . (int) $to_value . "

WHERE $column = '" . $db->sql_escape($from_value) . "'

AND " . $db->sql_in_set('user_id', $different_user_ids);

$queries[] = $sql;

}

if ($extra_update)

{

$same_user_ids = array_diff($old_user_ids[$notify_status][$from_value], $different_user_ids);

if (!empty($same_user_ids))

{

$sql = "UPDATE $table

SET $extra_update

WHERE $column = '" . (int) $to_value . "'

AND " . $db->sql_in_set('user_id', $same_user_ids);

$queries[] = $sql;

}

}

}

}

}

if (!empty($queries))

{

$db->sql_transaction('begin');

foreach ($queries as $sql)

{

$db->sql_query($sql);

}

$sql = "DELETE FROM $table

WHERE " . $db->sql_in_set($column, $from_values);

$db->sql_query($sql);

$db->sql_transaction('commit');

}

}