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103 lines
2.4 KiB
PHP
103 lines
2.4 KiB
PHP
<?php
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/**
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*
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* @package phpBB3
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* @copyright (c) 2012 phpBB Group
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* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
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*
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*/
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/**
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* @ignore
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*/
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if (!defined('IN_PHPBB'))
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{
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exit;
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}
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/**
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* Updates rows in given table from a set of values to a new value.
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* If this results in rows violating uniqueness constraints, the duplicate
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* rows are eliminated.
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*
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* The only supported tables are bookmarks and topics_watch.
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*
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* @param dbal $db Database object
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* @param string $table Table on which to perform the update
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* @param string $column Column whose values to change
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* @param array $from_values An array of values that should be changed
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* @param int $to_value The new value
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* @return null
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*/
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function phpbb_update_rows_avoiding_duplicates($db, $table, $column, $from_values, $to_value)
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{
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$sql = "SELECT $column, user_id
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FROM $table
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WHERE " . $db->sql_in_set($column, $from_values);
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$result = $db->sql_query($sql);
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$old_user_ids = array();
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while ($row = $db->sql_fetchrow($result))
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{
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$old_user_ids[$row[$column]][] = $row['user_id'];
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}
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$db->sql_freeresult($result);
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$sql = "SELECT $column, user_id
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FROM $table
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WHERE $column = '" . (int) $to_value . "'";
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$result = $db->sql_query($sql);
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$new_user_ids = array();
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while ($row = $db->sql_fetchrow($result))
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{
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$new_user_ids[$row[$column]][] = $row['user_id'];
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}
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$db->sql_freeresult($result);
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$queries = array();
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$any_found = false;
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foreach ($from_values as $from_value)
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{
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if (!isset($old_user_ids[$from_value]))
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{
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continue;
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}
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$any_found = true;
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if (empty($new_user_ids))
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{
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$sql = "UPDATE $table
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SET $column = " . (int) $to_value. "
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WHERE $column = '" . $db->sql_escape($from_value) . "'";
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$queries[] = $sql;
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}
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else
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{
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$different_user_ids = array_diff($old_user_ids[$from_value], $new_user_ids[$to_value]);
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if (!empty($different_user_ids))
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{
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$sql = "UPDATE $table
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SET $column = " . (int) $to_value. "
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WHERE $column = '" . $db->sql_escape($from_value) . "'
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AND " . $db->sql_in_set('user_id', $different_user_ids);
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$queries[] = $sql;
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}
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}
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}
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if ($any_found)
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{
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$db->sql_transaction('begin');
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foreach ($queries as $sql)
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{
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$db->sql_query($sql);
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}
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$sql = "DELETE FROM $table
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WHERE " . $db->sql_in_set($column, $from_values);
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$db->sql_query($sql);
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$db->sql_transaction('commit');
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}
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}
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