public function insert_log_statement($log_statement)
        {
                if (count($this->insert_queue) == $this->insert_queue_size)
                {
                        $sql = 'INSERT INTO ' . self::LOGSTATEMENTS . ' (full_log_call_id, statement, level, timestamp) ' ;
                        $sql .= ' VALUES ' ;

                        foreach ($this->insert_queue as $k => $stmt)
                        {
                                if ($k == 4)    { continue ; }
                                $sql .= $stmt . ', ' ;
                        }

                        unset($this->insert_queue) ;

                        return $this->insert($sql) ;
                }
                else
                {
                        $queue_sql = '(' . $log_statement['call_id'] . ', "' . $log_statement['log_data'] . '", "' ;
                        $queue_sql .= $log_statement['log_level'] . '", "' . $log_statement['timestamp'] . '")' ;
                        $this->insert_queue[] = $queue_sql ;
                }
        }