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(autoconst& stat :*execution_stats){ std::cout << stat.first <<":\t"<< stat.second <<"\n"; } }
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-14 UTC."],[[["This webpage details the `ProfileQueryResult` class in the Google Cloud Spanner C++ library, providing information about its usage and functionality across different versions."],["`ProfileQueryResult` represents the stream of `Rows` and profile statistics returned from `spanner::Client::ProfileQuery()`, enabling the retrieval of query results and associated performance metrics."],["The class supports iteration via `begin()` and `end()` methods, returning a sequence of `StatusOr\u003cRow\u003e` objects, which can be conveniently parsed into `std::tuple` types."],["`ProfileQueryResult` offers methods like `ExecutionStats()` and `ExecutionPlan()` to access execution statistics and the plan for a SQL statement after all rows have been processed."],["It includes a `ReadTimestamp()` function which returns a timestamp for when the data was read, but is only available if a read-only transaction was used."]]],[]]
