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[ticket/11162] An implementation that actually works.

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PHPBB3-11162
This commit is contained in:
Oleg Pudeyev 2012-12-01 20:12:31 -05:00
parent ac9c4d7d59
commit d0338531cb
1 changed files with 68 additions and 5 deletions
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73
phpBB/includes/functions.php
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@ -1311,12 +1311,75 @@ function tz_select($default = '', $truncate = false)
*/
function phpbb_update_rows_avoiding_duplicates($db, $table, $column, $from_values, $to_value)
{
$db->sql_return_on_error(true);
$condition = $db->sql_in_set($column, $from_values);
$db->sql_query('UPDATE ' . $table . ' SET ' . $column . ' = ' . (int) $to_value. ' WHERE ' . $condition);
$db->sql_return_on_error(false);
$sql = "SELECT $column, user_id
FROM $table
WHERE " . $db->sql_in_set($column, $from_values);
$result = $db->sql_query($sql);
$db->sql_query('DELETE FROM ' . $table . ' WHERE ' . $condition);
$old_user_ids = array();
while ($row = $db->sql_fetchrow($result))
{
$old_user_ids[$row[$column]][] = $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]][] = $row['user_id'];
}
$db->sql_freeresult($result);
$queries = array();
$any_found = false;
foreach ($from_values as $from_value)
{
if (!isset($old_user_ids[$from_value]))
{
continue;
}
$any_found = true;
if (empty($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[] = $sql;
}
}
}
if ($any_found)
{
//$db->sql_transaction('begin');
foreach ($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');
}
}
// Functions handling topic/post tracking/marking