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C++ Client Libraries | Google Cloud

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Cloud Spanner C++ Client Library

The Cloud Spanner C++ Client library offers types and functions to use Cloud Spanner from C++ applications.

Quickstart

The following "Hello World" program should give you a sense of how to use this library. This program is also used to illustrate how to incorporate the library into your project.

#include "google/cloud/spanner/client.h"
#include <iostream>

int main(int argc, char* argv[]) {
  if (argc != 4) {
    std::cerr << "Usage: " << argv[0]
              << " project-id instance-id database-id\n";
    return 1;
  }

  namespace spanner = ::google::cloud::spanner;
  spanner::Client client(
      spanner::MakeConnection(spanner::Database(argv[1], argv[2], argv[3])));

  auto rows =
      client.ExecuteQuery(spanner::SqlStatement("SELECT 'Hello World'"));

  for (auto const& row : spanner::StreamOf<std::tuple<std::string>>(rows)) {
    if (!row) {
      std::cerr << row.status() << "\n";
      return 1;
    }
    std::cout << std::get<0>(*row) << "\n";
  }

  return 0;
}

More Information

Read more about Cloud Spanner
Client::ExecuteQuery() to execute SQL queries in Cloud Spanner.
Client::Commit() to execute read-write transactions in Cloud Spanner.
Client::Read() to read the rows in a table.
Error Handling to learn how the library reports run-time errors.
Environment Variables for environment variables affecting the library. Some of these environment variables enable logging to the console. This can be an effective approach to diagnose runtime problems.
Override Retry, Backoff, and Re-Run Policies to learn how to override the default retry policies used by the library.
Override the default endpoint
Override the authentication configuration
Mocking the Cloud Spanner C++ Client with Google Mock
The Setting up your development environment guide describes how to set up a C++ development environment in various platforms, including the Google Cloud C++ client libraries.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["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 2025-08-14 UTC."],[[["The Cloud Spanner C++ Client library provides the tools necessary to interact with Cloud Spanner from C++ applications."],["The library allows for executing SQL queries, performing read-write transactions, and reading table rows via methods like `Client::ExecuteQuery()`, `Client::Commit()`, and `Client::Read()`."],["The documentation includes guides on error handling, environment variables, overriding retry policies, changing the default endpoint and authentication, and mocking, as well as a detailed guide on setting up the development environment."],["The latest version of the Cloud Spanner C++ Client library is 2.37.0-rc, but the documentation provides links to the version history going back to 2.11.0."]]],[]]

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