The Resultcache (in my case the APC version) does not work at all.

$cacheDriver = new Doctrine_Cache_Apc();
$manager = Doctrine_Manager::getInstance();
$manager->setAttribute(Doctrine::ATTR_QUERY_CACHE, $cacheDriver);
$manager->setAttribute(Doctrine::ATTR_RESULT_CACHE, $cacheDriver);

...connecting...

for ($i = 0; $i < 500; $i++) {
  $u = Doctrine_Query::create()
    ->from('User u')
    ->addWhere('u.Login=?', array('DemoUser'))
    ->execute();
}

The first query ($i=0) works as expected as it doesnt read from cache. But the 2nd results in this exception:

<b>Warning</b>:  unserialize() expects parameter 1 to be string, array given in <b>J:ProgrammePHPPEARDoctrinelibDoctrineQueryAbstract.php</b> on line <b>1127</b><br />
<b>Warning</b>:  Invalid argument supplied for foreach() in <b>J:ProgrammePHPPEARDoctrinelibDoctrineQueryAbstract.php</b> on line <b>1133</b><br />
<b>Fatal error</b>:  Uncaught exception 'Doctrine_Query_Exception' with message 'Root component not initialized.' in J:ProgrammePHPPEARDoctrinelibDoctrineQueryAbstract.php:868
Stack trace:
#0 J:ProgrammePHPPEARDoctrinelibDoctrineQueryAbstract.php(568): Doctrine_Query_Abstract-&gt;getRoot()
#1 J:ProgrammePHPPEARDoctrinelibDoctrineQueryAbstract.php(963): Doctrine_Query_Abstract-&gt;convertEnums(Array)
#2 J:ProgrammePHPPEARDoctrinelibDoctrineQueryAbstract.php(1019): Doctrine_Query_Abstract-&gt;_execute(Array)
#3 W:PrivatJavaWebPortaldoctrine.php(30): Doctrine_Query_Abstract-&gt;execute()
#4 {main}
  thrown in <b>J:ProgrammePHPPEARDoctrinelibDoctrineQueryAbstract.php</b> on line <b>868</b><br />

When patching the function Abstract.php like this:

  protected function _constructQueryFromCache($cached)
  {
    if (is_array($cached))
      $cached = $cached[0];

the error is gone but the resultcache doesnt work either. Nothing is written to APC nor read from.

Regards, Markus