Function read_array_by_label

examples/cpp_api/quickstart_dimension_labels.cc:275–321

* Example reading data from the array by the dimension labels. * * @param ctx TileDB context to call TileDB API with. * @param array_uri URI of the array to read from. */

 * @param array_uri URI of the array to read from.
 */
void read_array_by_label(const Context& ctx, const char* array_uri) {
  printf("\nRead array from label ranges\n");
  Array array(ctx, array_uri, TILEDB_READ);

  // Create subarray for reading data.
  double y_range[2] = {3.0, 8.0};
  int64_t timestamp_range[2] = {31943, 32380};
  Subarray subarray(ctx, array);
  SubarrayExperimental::add_label_range(
      ctx, subarray, "y", y_range[0], y_range[1]);
  SubarrayExperimental::add_label_range(
      ctx, subarray, "timestamp", timestamp_range[0], timestamp_range[1]);

  // Create buffers to hold the output data.
  std::vector<int16_t> a(6);
  std::vector<double> y(3);
  std::vector<int64_t> timestamp(2);

  // Create the query.
  // Note: Setting the label buffers is optional. If they are not set, then
  // only data for `a` will be returned.
  Query query(ctx, array);
  query.set_layout(TILEDB_ROW_MAJOR);
  query.set_subarray(subarray);
  QueryExperimental::set_data_buffer(query, "y", y);
  QueryExperimental::set_data_buffer(query, "timestamp", timestamp);
  query.set_data_buffer("a", a);

  // Submit the query.
  auto status = query.submit();
  if (status != Query::Status::COMPLETE) {
    printf("Warning: Read query did not complete.\n");
  }

  // Print results.
  for (unsigned i = 0; i < 3; ++i) {
    for (unsigned j = 0; j < 2; ++j) {
      printf(" Cell (%3.1f, ", y[i]);
      print_timestamp(timestamp[j]);
      printf(")\n");
      printf("    * a(%3.1f, ", y[i]);
      print_timestamp(timestamp[j]);
      printf(") = %d\n", a[2 * i + j]);
      printf("\n");
    }
  }
}

/** Run the example. */
int main() {