/**
  * Quotes primitive value with its primitve variable (alias.var)
  * @param mixed $v
  * @param string $pvar
  * @return true|string (error message if string)
  */
 private function _qq(&$v, &$pvar)
 {
     // unquote pvar
     $pvar_ = $this->uq($pvar);
     // split primitive var to alias and var
     list($alias, $var) = explode('.', $pvar_);
     if (!$alias || !$var) {
         return "Invalid primitive variable [{$pvar}]";
     }
     // get the class for alias
     if (!($class = $this->aliases[$alias])) {
         return "No class found for alias [{$alias}]";
     }
     // get class map
     if (!($cm = $this->em->getClassMap($class))) {
         return "No class map for [{$class}]";
     }
     // is var 'oid'?
     if ($var == 'oid') {
         // replace var name with column name
         $pvar = $this->qid($alias) . '.' . $this->qid($cm->getOidColumn());
     } else {
         // get field map (for non-oid field)
         if (!($fm = $cm->getField($var))) {
             return "No field map for [{$class}::{$var}]";
         }
         // replace var name with column name
         $pvar = $this->qid($alias) . '.' . $this->qid($fm->getColumnName());
         // quote value
         $v = $this->q($v, $fm);
     }
     return true;
 }
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 /**
  * Makes a cache key for a class 
  * 
  * Since EZPDO allows a user to change database (DSN) at runtime (see 
  * {@link epManager::setDsn()}), it is important to use the current 
  * DSN of the class in generating the cache key.
  * 
  * @param string $class The class name
  * @param string $extra The extra string (mostly for locking type)
  * @return false|string
  */
 protected function _key($class, $extra = '')
 {
     if (!($cm =& self::$em->getClassMap($class))) {
         return false;
     }
     if (!($dsn = $cm->getDsn())) {
         return false;
     }
     return md5($dsn . $class . $extra);
 }
 /**
  * Prepare database if not exists
  * @param string $class
  * @param string $rtable (relationship table, only used if class is epObjectRelation)
  * @return boolean
  */
 public function prepareDb($class, $rtable = false)
 {
     // if relation table is given, set it to runtime manager
     if ($rtable) {
         self::$em->setRelationTable($rtable);
     }
     // get class map for class
     if (!($cm = self::$em->getClassMap($class))) {
         return false;
     }
     // no table for abstract class
     if ($cm->isAbstract()) {
         return true;
     }
     return self::$db->create($cm);
 }