/**
  *
  */
 function _prepare_values_clause()
 {
     if ($this->type == 'single') {
         return parent::_prepare_values_clause();
     } else {
         if ($this->type == 'multiple') {
             return $this->_prepare_values_multiple_clause();
         }
     }
 }
 /**
  *
  *
  *
  *
  * @param QueryBuilder $queryBuilder
  * @param array $params
  * @return array
  *
  * @version 20130211, d10n:
  */
 function MultiQuery(QueryBuilder $queryBuilder, $params = array())
 {
     //die();
     // 20130211 d10n :
     $str = $queryBuilder->Prepare($params);
     //print_r($str);
     $timer = Timer::Start();
     $mqresult = mysqli_multi_query($this->connection, $str);
     //print_r($mqresult);
     //die();
     if (!$mqresult) {
         print_r("Error executing query<br><b>{$str}</b><br>" . mysqli_errno($this->connection) . ": " . mysqli_error($this->connection) . "\n" . $str);
         trigger_error("Error executing multi query (rowset #1) <br><b>{$str}</b><br>" . mysqli_errno($this->connection) . ": " . mysqli_error($this->connection) . "\n" . $str, E_USER_ERROR);
         //print_r("Error executing multi query (rowset #1) <br><b>$str</b><br>" . mysqli_errno($this->connection) . ": " . mysqli_error($this->connection) . "\n" . $str);
         //print_r("Error executing multi query (rowset #1) <br><b>$str</b><br>" . mysqli_errno($this->connection) . ": " . mysqli_error($this->connection) . "\n" . $str, E_USER_ERROR);
         _503('Error');
     }
     $res = array();
     $counter = 1;
     do {
         $counter++;
         if ($result = mysqli_store_result($this->connection)) {
             $set = array();
             while ($row = mysqli_fetch_assoc($result)) {
                 $set[] = $row;
             }
             mysqli_free_result($result);
             $res[] = $set;
         }
         $more_result = mysqli_more_results($this->connection);
         if ($more_result) {
             if (!mysqli_next_result($this->connection)) {
                 //print_r("Error executing query<br><b>$str</b><br>" . mysqli_errno($this->connection) . ": " . mysqli_error($this->connection) . "\n" . $str);
                 trigger_error("Error executing multi query (rowset #{$counter}) <br><b>{$str}</b><br>" . mysqli_errno($this->connection) . ": " . mysqli_error($this->connection) . "\n" . $str, E_USER_ERROR);
                 _503('Error');
             }
         }
     } while ($more_result);
     //
     //
     // CUT_LOG yes/no
     // MAX_LENGTH_PER_PARAM > 100
     if (CUT_LOG == 'yes') {
         foreach ($params['values'] as $key => $value) {
             $value = (string) $value;
             if (mb_strlen($value) > MAX_LENGTH_PER_PARAM) {
                 $params['values'][$key] = mb_strcut($value, 0, MAX_LENGTH_PER_PARAM) . ' ...';
             }
         }
         $str = $queryBuilder->Prepare($params);
     }
     $this->_log_query($str, $timer->Stop());
     //print_r('1');
     return $res;
 }