docs: public BatchWriteItemResponse batchWriteItem(BatchWriteItemRequest request)
              throws BceClientException, BceServiceException {
          checkNotNull(request, "request should not be null.");
          InternalRequest httpRequest = createRequestUnderInstance(HttpMethodName.POST,
                  MolaDbConstants.URI_TABLE);
          httpRequest.addParameter(MolaDbConstants.URI_BATCH_WRITE, null);
          fillInHeadAndBody(request, httpRequest);
          BatchWriteItemResponse ret = this.invokeHttpClient(httpRequest, BatchWriteItemResponse.class);
          return ret;
      }