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C++ Client Libraries | Google Cloud

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An idiomatic C++ client library for the Cloud Datastore API. This API accesses the schemaless NoSQL database to provide fully managed, robust, scalable storage for your application.

While this library is GA, please note that the Google Cloud C++ client libraries do not follow Semantic Versioning.

The following shows the code that you'll run in the google/cloud/datastore/quickstart/ directory, which should give you a taste of the Cloud Datastore API C++ client library API.

#include "google/cloud/datastore/v1/datastore_client.h"
#include <iostream>

int main(int argc, char* argv[]) try {
  if (argc != 2) {
    std::cerr << "Usage: " << argv[0] << " project-id\n";
    return 1;
  }

  namespace datastore = ::google::cloud::datastore_v1;
  auto client =
      datastore::DatastoreClient(datastore::MakeDatastoreConnection());

  auto const* project_id = argv[1];

  google::datastore::v1::Key key;
  key.mutable_partition_id()->set_project_id(project_id);
  auto& path = *key.add_path();
  path.set_kind("Task");
  path.set_name("sampletask1");

  google::datastore::v1::Mutation mutation;
  auto& upsert = *mutation.mutable_upsert();
  *upsert.mutable_key() = key;
  google::datastore::v1::Value value;
  value.set_string_value("Buy milk");
  upsert.mutable_properties()->insert({"description", std::move(value)});

  auto put = client.Commit(
      project_id, google::datastore::v1::CommitRequest::NON_TRANSACTIONAL,
      {mutation});
  if (!put) throw std::move(put).status();

  std::cout << "Saved " << key.DebugString() << " " << put->DebugString()
            << "\n";

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

This library offers multiple *Client classes, which are listed below. Each one of these classes exposes all the RPCs for a service as member functions of the class. This library groups multiple services because they are part of the same product or are often used together. A typical example may be the administrative and data plane operations for a single product.

The library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the *Client classes when testing your application.

• datastore_admin_v1::DatastoreAdminClient
• datastore_v1::DatastoreClient

• Error Handling - describes how the library reports errors.
• How to Override the Default Endpoint - describes how to override the default endpoint.
• How to Override the Authentication Credentials - describes how to change the authentication credentials used by the library.
• Override Retry, Backoff, and Idempotency Policies - describes how to change the default retry policies.
• Environment Variables - describes environment variables that can configure the behavior of the library.

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."],[[["This webpage details the C++ client library for the Cloud Datastore API, a schemaless NoSQL database offering scalable storage."],["The latest version of the client library is 2.37.0-rc, with numerous prior versions available, and it's important to note that Google Cloud C++ client libraries do not follow Semantic Versioning."],["The library offers multiple client classes, including `datastore_admin_v1::DatastoreAdminClient` and `datastore_v1::DatastoreClient`, each providing access to the RPCs of their respective services."],["The provided code snippet in the quickstart section demonstrates how to use the `DatastoreClient` to create a new \"Task\" and save it."],["The documentation provides further information regarding error handling, how to override the default endpoint and authentication credentials, override retry, backoff and idempotency policies, as well as the available environment variables."]]],[]]

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