google::cloud::spanner::ProfileDmlResult Class Reference

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

#include <google/cloud/spanner/results.h>

Public Member Functions
	ProfileDmlResult ()=default
	ProfileDmlResult (std::unique_ptr< ResultSourceInterface > source)
	ProfileDmlResult (ProfileDmlResult &&)=default
ProfileDmlResult &	operator= (ProfileDmlResult &&)=default
std::int64_t	RowsModified () const
	Returns the number of rows modified by the DML statement. More...
absl::optional< std::unordered_map< std::string, std::string > >	ExecutionStats () const
	Returns a collection of key value pair statistics for the SQL statement execution. More...
absl::optional< spanner::ExecutionPlan >	ExecutionPlan () const
	Returns the plan of execution for the SQL statement. More...

Detailed Description

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.

Note

ProfileDmlResult returns the number of rows modified, execution statistics, and query plan.

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";
    }
  }

Constructor & Destructor Documentation

ProfileDmlResult() [1/3]

google::cloud::spanner::ProfileDmlResult::ProfileDmlResult ( )

default

ProfileDmlResult() [2/3]

google::cloud::spanner::ProfileDmlResult::ProfileDmlResult ( std::unique_ptr< ResultSourceInterface >  source )

inlineexplicit

ProfileDmlResult() [3/3]

google::cloud::spanner::ProfileDmlResult::ProfileDmlResult ( ProfileDmlResult &&  )

default

Member Function Documentation

ExecutionPlan()

absl::optional< spanner::ExecutionPlan > google::cloud::spanner::ProfileDmlResult::ExecutionPlan

(

)

const

Returns the plan of execution for the SQL statement.

ExecutionStats()

absl::optional< std::unordered_map< std::string, std::string > > google::cloud::spanner::ProfileDmlResult::ExecutionStats

(

)

const

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

Note

Only available when the SQL statement is executed.

operator=()

ProfileDmlResult & google::cloud::spanner::ProfileDmlResult::operator= ( ProfileDmlResult &&  )

default

RowsModified()

std::int64_t google::cloud::spanner::ProfileDmlResult::RowsModified

(

)

const

Returns the number of rows modified by the DML statement.

Note

Partitioned DML only provides a lower bound of the rows modified, all other DML statements provide an exact count.