public async Task TranAsync(IsolationLevel iso, DeadlockRetryConfig retry_config, TransactionalTaskAsync task)
        {
            await EnsureOpenAsync();

            if (retry_config == null)
            {
                retry_config = this.DeadlockRetryConfig;
            }

            int num_retry = 0;

LABEL_RETRY:
            try
            {
                using (UsingTran u = this.UsingTran(iso))
                {
                    if (await task())
                    {
                        u.Commit();
                    }
                }
            }
            catch (SqlException sqlex)
            {
                if (sqlex.Number == 1205)
                {
                    // デッドロック発生
                    num_retry++;
                    if (num_retry <= retry_config.RetryCount)
                    {
                        await Task.Delay(Secure.Rand31i() % retry_config.RetryAverageInterval);

                        goto LABEL_RETRY;
                    }

                    throw;
                }
                else
                {
                    throw;
                }
            }
        }
        public void Tran(IsolationLevel iso, DeadlockRetryConfig retry_config, TransactionalTask task)
        {
            EnsureOpen();
            if (retry_config == null)
            {
                retry_config = this.DeadlockRetryConfig;
            }

            int num_retry = 0;

LABEL_RETRY:
            try
            {
                using (UsingTran u = this.UsingTran(iso))
                {
                    if (task())
                    {
                        u.Commit();
                    }
                }
            }
            catch (SqlException sqlex)
            {
                if (sqlex.Number == 1205)
                {
                    // デッドロック発生
                    num_retry++;
                    if (num_retry <= retry_config.RetryCount)
                    {
                        Kernel.SleepThread(Secure.Rand31i() % retry_config.RetryAverageInterval);

                        goto LABEL_RETRY;
                    }

                    throw;
                }
                else
                {
                    throw;
                }
            }
        }