README.md

Cloud Datastore API C++ Client Library

This directory contains 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.

Quickstart

The quickstart/ directory contains a minimal environment to get started using this client library in a larger project. The following "Hello World" program is used in this quickstart, and should give you a taste of this library.

#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;
}

More Information

• Official documentation about the Cloud Datastore API service
• Reference doxygen documentation for each release of this client library
• Detailed header comments in our public .h files