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* Filemanager/API: automatically decrement and store subquery depth limit, to work around different limits in different MySQL versions and configurations causing SQL error

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This commit is contained in:
Ralf Becker 2012-06-26 12:05:31 +00:00
parent 6c708791a2
commit 99150590c6
1 changed files with 61 additions and 41 deletions
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24
phpgwapi/inc/class.sqlfs_stream_wrapper.inc.php
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@ -1050,6 +1050,12 @@ class sqlfs_stream_wrapper implements iface_stream_wrapper
*/
static function url_stat ( $url, $flags, $eacl_access=null )
{
static $max_subquery_depth;
if (is_null($max_subquery_depth))
{
$max_subquery_depth = $GLOBALS['egw_info']['server']['max_subquery_depth'];
if (!$max_subquery_depth) $max_subquery_depth = 7; // setting current default of 7, if nothing set
}
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$url',$flags,$eacl_access)");
$path = parse_url($url,PHP_URL_PATH);
@ -1084,6 +1090,7 @@ class sqlfs_stream_wrapper implements iface_stream_wrapper
$eacl_access = self::check_extended_acl($path,egw_vfs::READABLE); // should be static::check_extended_acl, but no lsb!
}
try {
foreach($parts as $n => $name)
{
if ($n == 0)
@ -1095,8 +1102,8 @@ class sqlfs_stream_wrapper implements iface_stream_wrapper
// MySQL 5.0 has a nesting limit for subqueries
// --> we replace the so far cumulated subqueries with their result
// no idea about the other DBMS, but this does NOT hurt ...
// setting the value to 7, after reports on the user list, thought MySQL 5.0.51 with MyISAM engine works up to 10
if ($n > 1 && !(($n-1) % 7) && !($query = self::$pdo->query($query)->fetchColumn()))
// --> depth limit of subqueries is now dynamicly decremented in catch
if ($n > 1 && !(($n-1) % $max_subquery_depth) && !($query = self::$pdo->query($query)->fetchColumn()))
{
if (self::LOG_LEVEL > 1)
{
@ -1139,6 +1146,19 @@ class sqlfs_stream_wrapper implements iface_stream_wrapper
// we also store negatives (all methods creating new files/dirs have to unset the stat-cache!)
return self::$stat_cache[$path] = false;
}
}
catch (PDOException $e) {
// decrement subquery limit by 1 and try again, if not already smaller then 3
if ($max_subquery_depth < 3)
{
throw new egw_exception_db($e->getMessage());
}
$GLOBALS['egw_info']['server']['max_subquery_depth'] = --$max_subquery_depth;
error_log(__METHOD__."() decremented max_subquery_depth to $max_subquery_depth");
config::save_value('max_subquery_depth', $max_subquery_depth, 'phpgwapi');
if (method_exists($GLOBALS['egw'],'invalidate_session_cache')) $GLOBALS['egw']->invalidate_session_cache();
return self::url_stat($url, $flags, $eacl_access);
}
self::$stat_cache[$path] = $info;
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($url,$flags)=".array2string($info));