Class ProfileQueryResult (2.30.0)

This is a range defined by the Input Iterators returned from its begin() and end() members. Callers may directly iterate the ProfileQueryResult instance, which will return a sequence of StatusOr<Row> objects.

For convenience, callers may wrap instances in a StreamOf<std::tuple<...>> object, which will automatically parse each Row into a std::tuple with the specified types.

Example:

  namespace spanner = ::google::cloud::spanner;
  spanner::SqlStatement select(
      "SELECT AlbumId, AlbumTitle, MarketingBudget"
      " FROM Albums"
      " WHERE AlbumTitle >= 'Aardvark' AND AlbumTitle < 'Goo'");
  auto profile_query_result = client.ProfileQuery(std::move(select));
  for (auto& row : profile_query_result) {
    if (!row) throw std::move(row).status();
    // Discard rows for brevity in this example.
  }

  // Stats are only available after all rows from the result have been read.
  auto execution_stats = profile_query_result.ExecutionStats();
  if (execution_stats) {
    for (auto const& stat : *execution_stats) {
      std::cout << stat.first << ":\t" << stat.second << "\n";
    }
  }