/**
  * Store in the table all value corresponding to a key
  * @param \taoResultServer_models_classes_Variable $variable
  */
 private function storeKeysValues($variableId, \taoResultServer_models_classes_Variable $variable)
 {
     $basetype = $variable->getBaseType();
     foreach (array_keys((array) $variable) as $key) {
         $getter = 'get' . ucfirst($key);
         $value = null;
         if (method_exists($variable, $getter)) {
             $value = $variable->{$getter}();
             if ($key == 'value' || $key == 'candidateResponse') {
                 $value = base64_encode($value);
             }
         }
         if ($key == 'epoch' && !$variable->isSetEpoch()) {
             $value = microtime();
         }
         $this->persistence->insert(self::RESULT_KEY_VALUE_TABLE_NAME, array(self::RESULTSKV_FK_COLUMN => $variableId, self::KEY_COLUMN => $key, self::VALUE_COLUMN => $value));
     }
 }