DatastoreにLow Level APIでデータの登録をかける

Datastoreにデータの新規登録をする際には以下のように行います。

  private static void createHoge(String id) throws DatastoreException {

    BeginTransactionRequest.Builder treq = BeginTransactionRequest.newBuilder();
    BeginTransactionResponse tres = datastore.beginTransaction(treq.build());
    ByteString tx = tres.getTransaction();

    CommitRequest.Builder request = CommitRequest.newBuilder();
    request.setTransaction(tx);
    Entity.Builder entity = Entity.newBuilder();

    Key.Builder key =
      Key.newBuilder().addPathElement(
        Key.PathElement.newBuilder().setKind("Hoge").setName(id));
    entity.setKey(key);
    entity.addProperty(Property.newBuilder().setName("param").setValue(
      Value.newBuilder().setStringValue(id)));
    entity.addProperty(Property.newBuilder().setName("v").setValue(
      Value.newBuilder().setIntegerValue(1)));
    entity.addProperty(Property.newBuilder().setName("sV").setValue(
      Value.newBuilder().setIntegerValue(1)));

    request.getMutationBuilder().addInsert(entity);

    CommitResponse response = datastore.commit(request.build());

    request.clearTransaction();
  }