Datastore Mode
There can only be one Cloud Firestore instance associated with a single project. The Datastore instance is automatically created when you enable the API:
There can only be one Datastore instance associated with a single project. The Cloud Firestore in Datastore instance is automatically created when you enable the API:
gcloud services enable datastore.googleapis.com
Because Cloud Firestore is a NoSQL database, you do not need to explicitly create tables, define data schema, etc. Simply use the API to store new documents, and perform CRUD operations.
The easiest way to access Datastore is using Spring Cloud GCP's Spring Data Datastore starter. This starter provides full Spring Data support for Datastore while implementing idiomatic access patterns.
Spring Data Feature | Supported |
ORM | ✅ |
Declarative Transaction | ✅ |
Repository | ✅ |
REST Repository | ✅ |
Query methods | ✅ |
Query annotation | ✅ |
Pagination | ✅ |
Events | ✅ |
Auditing | ✅ |
Add the Spring Data Datastore starter:
Maven
Gradle
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-gcp-starter-data-datastore</artifactId>
</dependency>
compile group: 'org.springframework.cloud', name: 'spring-cloud-gcp-starter-data-datastore'
There is no explicit configuration required if you use the automatic authentication and project ID detection. I.e., if you already logged in locally with
gcloud command line, then it'll automatically use Datastore from the project you configured in gcloud.Notice that there is no explicit configuration for username/password. Cloud Firestore authentication uses the GCP credential (either your user credential, or Service Account credential), and authorization is configured via Identity Access Management (IAM).
Spring Data Cloud Datastore allows you to map domain POJOs to Datastore documents via annotations. Read the Spring Data Datastore reference documentation for details
@Entity
class Order {
@Id
private Long id;
private String description;
private LocalDateTime timestamp;
private List<OrderItem> items;
// Getters and setters ...
}
@Entity
class OrderItem {
private String description;
private Long quantity;
// Getters and setters ...
}
Because Datastore is a document-oriented NoSQL database, you can have nested structure, you can establish parent-children relationships without complicated foreign keys.
Use Spring Data repository to quickly get CRUD access to the Datastore.
@Repository
interface OrderRepository extends DatastoreRepository<Order, Long> {
}
In a business logic service you can utilize the repositories:
@Service
class OrderService {
private final OrderRepository orderRepository;
OrderService(OrderRepository orderRepository) {
this.orderRepository = orderRepository;
}
@Transactional
Order createOrder(Order order) {
// Set the creation time
order.setTimestamp(LocalDateTime.now());
// Children are saved in cascade.
return orderRepository.save(order);
}
}
Spring Data Rest can expose a Spring Data repository directly on a RESTful endpoint, and rendering the payload as JSON with HATEOAS format. It supports common access patterns like pagination.
Add Spring Data Rest starter:
Maven
Gradle
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-rest'
@RepositoryRestResource
interface OrderRepository extends DatastoreRepository<Order, String> {
}
To access the endpoint for Order:
curl http://localhost:8080/orders
Last modified 3yr ago