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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 offers a range of functions, including `Client::ExecuteQuery()`, `Client::Commit()`, and `Client::Read()`, for executing SQL queries, managing transactions, and reading table data, respectively."],["The latest release of the library is 2.37.0-rc, with previous versions, down to version 2.11.0, also listed and accessible."],["The \"Hello World\" example code demonstrates how to use the library to connect to Cloud Spanner and execute a simple query."],["The documentation includes information on error handling, environment variables, retry policies, endpoint and authentication overrides, and mocking for testing purposes."]]],[]]

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