google::cloud::spanner::DmlResult Class Reference

Represents the result of a data modifying operation using spanner::Client::ExecuteDml(). More...

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

Public Member Functions
	DmlResult ()=default
	DmlResult (std::unique_ptr< ResultSourceInterface > source)
	DmlResult (DmlResult &&)=default
DmlResult &	operator= (DmlResult &&)=default
std::int64_t	RowsModified () const
	Returns the number of rows modified by the DML statement. More...

Detailed Description

Represents the result of a data modifying operation using spanner::Client::ExecuteDml().

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

Note

ExecuteDmlResult returns the number of rows modified.

Example:

  using ::google::cloud::StatusOr;
  namespace spanner = ::google::cloud::spanner;
  std::int64_t rows_inserted;
  auto commit_result = client.Commit(
      [&client, &rows_inserted](
          spanner::Transaction txn) -> StatusOr<spanner::Mutations> {
        auto insert = client.ExecuteDml(
            std::move(txn),
            spanner::SqlStatement(
                "INSERT INTO Singers (SingerId, FirstName, LastName)"
                "  VALUES (10, 'Virginia', 'Watson')"));
        if (!insert) return std::move(insert).status();
        rows_inserted = insert->RowsModified();
        return spanner::Mutations{};
      });
  if (!commit_result) throw std::move(commit_result).status();
  std::cout << "Rows inserted: " << rows_inserted;

Constructor & Destructor Documentation

DmlResult() [1/3]

google::cloud::spanner::DmlResult::DmlResult ( )

default

DmlResult() [2/3]

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

inlineexplicit

DmlResult() [3/3]

google::cloud::spanner::DmlResult::DmlResult ( DmlResult &&  )

default

Member Function Documentation

operator=()

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

default

RowsModified()

std::int64_t google::cloud::spanner::DmlResult::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.