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Showing content from https://cloud.google.com/cpp/docs/reference/datastore/2.23.0 below:

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."],[[["The latest release candidate version for the Cloud Datastore API C++ Client Library is 2.37.0-rc, with a comprehensive list of versions available, starting from 2.36.0 and down to 2.15.1."],["The Cloud Datastore API C++ Client Library offers access to a schemaless NoSQL database and is generally available, although it does not adhere to Semantic Versioning."],["The library provides `DatastoreAdminClient` and `DatastoreClient` classes, which contain all Remote Procedure Calls (RPCs) for their respective services, and is used for both administrative and data plane operations."],["The library's functionality can be configured using a number of features, including Error Handling, overriding the default endpoint and credentials, and overriding retry, backoff, and idempotency policies, with additional customization via environment variables."],["The provided quickstart demonstrates how to create a `DatastoreClient` and use it to perform a commit operation, showcasing how to interact with the Cloud Datastore API."]]],[]]

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