Cloud Datastore API C++ Client Library

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 notfollow Semantic Versioning .

Quickstart

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;
}

Main classes

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.

More Information

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.