Class ProfileDmlResult (2.24.0)

Represents the result and profile stats of a data modifying operation using spanner::Client::ProfileDml().

This class encapsulates the result of a Cloud Spanner DML operation, i.e., INSERT, UPDATE, or DELETE.

Example:
  spanner::ProfileDmlResult dml_result;
  auto commit_result = client.Commit(
      [&client,
       &dml_result](spanner::Transaction txn) -> StatusOr<spanner::Mutations> {
        auto update = client.ProfileDml(
            std::move(txn),
            spanner::SqlStatement(
                "UPDATE Albums SET MarketingBudget = MarketingBudget * 2"
                "  WHERE SingerId = 1 AND AlbumId = 1"));
        if (!update) return std::move(update).status();
        dml_result = *std::move(update);
        return spanner::Mutations{};
      });
  if (!commit_result) throw std::move(commit_result).status();

  // Stats only available after statement has been executed.
  std::cout << "Rows modified: " << dml_result.RowsModified();
  auto execution_stats = dml_result.ExecutionStats();
  if (execution_stats) {
    for (auto const& stat : *execution_stats) {
      std::cout << stat.first << ":\t" << stat.second << "\n";
    }
  }

Constructors

ProfileDmlResult()

ProfileDmlResult(std::unique_ptr< ResultSourceInterface >)

Parameter
Name Description
source std::unique_ptr< ResultSourceInterface >

ProfileDmlResult(ProfileDmlResult &&)

Parameter
Name Description
ProfileDmlResult &&

Operators

operator=(ProfileDmlResult &&)

Parameter
Name Description
ProfileDmlResult &&
Returns
Type Description
ProfileDmlResult &

Functions

RowsModified() const

Returns the number of rows modified by the DML statement.

Returns
Type Description
std::int64_t

ExecutionStats() const

Returns a collection of key value pair statistics for the SQL statement execution.

Returns
Type Description
absl::optional< std::unordered_map< std::string, std::string > >

ExecutionPlan() const

Returns the plan of execution for the SQL statement.

Returns
Type Description
absl::optional< spanner::ExecutionPlan >