Example #1
0
func ExampleCommit_Key() {
	ctx := context.Background()
	client, err := datastore.NewClient(ctx, "")
	if err != nil {
		// TODO: Handle error.
	}
	var pk1, pk2 *datastore.PendingKey
	// Create two posts in a single transaction.
	commit, err := client.RunInTransaction(ctx, func(tx *datastore.Transaction) error {
		var err error
		pk1, err = tx.Put(datastore.NewIncompleteKey(ctx, "Post", nil), &Post{Title: "Post 1", PublishedAt: time.Now()})
		if err != nil {
			return err
		}
		pk2, err = tx.Put(datastore.NewIncompleteKey(ctx, "Post", nil), &Post{Title: "Post 2", PublishedAt: time.Now()})
		if err != nil {
			return err
		}
		return nil
	})
	if err != nil {
		// TODO: Handle error.
	}
	// Now pk1, pk2 are valid PendingKeys. Let's convert them into real keys
	// using the Commit object.
	k1 := commit.Key(pk1)
	k2 := commit.Key(pk2)
	fmt.Println(k1, k2)
}
Example #2
0
func ExampleClient_PutMulti() {
	ctx := context.Background()
	client, _ := datastore.NewClient(ctx, "my-proj")
	// [START batch_upsert]
	tasks := []*Task{
		{
			Category:    "Personal",
			Done:        false,
			Priority:    4,
			Description: "Learn Cloud Datastore",
		},
		{
			Category:    "Personal",
			Done:        false,
			Priority:    5,
			Description: "Integrate Cloud Datastore",
		},
	}
	keys := []*datastore.Key{
		datastore.NewIncompleteKey(ctx, "Task", nil),
		datastore.NewIncompleteKey(ctx, "Task", nil),
	}

	keys, err := client.PutMulti(ctx, keys, tasks)
	// [END batch_upsert]
	_ = err  // Make sure you check err.
	_ = keys // keys now has the complete keys for the newly stored tasks.
}
Example #3
0
func ExampleNewIncompleteKey() {
	ctx := context.Background()
	// [START incomplete_key]
	taskKey := datastore.NewIncompleteKey(ctx, "Task", nil)
	// [END incomplete_key]
	_ = taskKey // Use the task key for datastore operations.
}
Example #4
0
func ExampleClient_Put() {
	ctx := context.Background()
	client, err := datastore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}

	type Article struct {
		Title       string
		Description string
		Body        string `datastore:",noindex"`
		Author      *datastore.Key
		PublishedAt time.Time
	}
	newKey := datastore.NewIncompleteKey(ctx, "Article", nil)
	_, err = client.Put(ctx, newKey, &Article{
		Title:       "The title of the article",
		Description: "The description of the article...",
		Body:        "...",
		Author:      datastore.NewKey(ctx, "Author", "jbd", 0, nil),
		PublishedAt: time.Now(),
	})
	if err != nil {
		// TODO: Handle error.
	}
}
Example #5
0
func ExampleClient_Put_upsert() {
	ctx := context.Background()
	client, _ := datastore.NewClient(ctx, "my-proj")
	task := &Task{} // Populated with appropriate data.
	key := datastore.NewIncompleteKey(ctx, "Task", nil)
	// [START upsert]
	key, err := client.Put(ctx, key, task)
	// [END upsert]
	_ = err // Make sure you check err.
	_ = key // key is the complete key for the newly stored task
}
Example #6
0
func main() {
	ctx := context.Background()

	pubsubClient, err := pubsub.NewClient(ctx, "project")
	if err != nil {
		log.Fatalf("pubsub.NewClient: %v", err)
	}
	topic, err := pubsubClient.NewTopic(ctx, "topic")
	if err != nil {
		log.Fatalf("NewTopic: %v", err)
	}
	sub, err := pubsubClient.NewSubscription(ctx, "sub", topic, 0, nil)
	if err != nil {
		log.Fatalf("NewSubscription: %v", err)
	}
	if _, err := topic.Publish(ctx, &pubsub.Message{
		Data: []byte("hello"),
	}); err != nil {
		log.Fatalf("Publish: %v", err)
	}
	it, err := sub.Pull(ctx)
	if err != nil {
		log.Fatalf("Pull: %v", err)
	}
	msg, err := it.Next()
	if err != nil {
		log.Fatalf("Next: %v", err)
	}
	log.Printf("pubsub message: %s", msg.Data)
	msg.Done(true)
	it.Stop()

	datastoreClient, err := datastore.NewClient(ctx, "project")
	if err != nil {
		log.Fatalf("datastore.NewClient: %v", err)
	}
	k := datastore.NewIncompleteKey(ctx, "Foo", nil)
	k, err = datastoreClient.Put(ctx, k, &Foo{F: "foo!"})
	if err != nil {
		log.Fatalf("Put: %v", err)
	}

	var f Foo
	if err := datastoreClient.Get(ctx, k, &f); err != nil {
		log.Fatalf("Get: %v", err)
	}
	log.Printf("datastore got %v", f)
}
Example #7
0
func ExampleClient_AllocateIDs() {
	ctx := context.Background()
	client, err := datastore.NewClient(ctx, "project-id")
	if err != nil {
		// TODO: Handle error.
	}
	var keys []*datastore.Key
	for i := 0; i < 10; i++ {
		keys = append(keys, datastore.NewIncompleteKey(ctx, "Article", nil))
	}
	keys, err = client.AllocateIDs(ctx, keys)
	if err != nil {
		// TODO: Handle error.
	}
	_ = keys // TODO: Use keys.
}
Example #8
0
func ExampleClient_Put() {
	ctx := context.Background()
	client, _ := datastore.NewClient(ctx, "my-proj")
	// [START entity_with_parent]
	parentKey := datastore.NewKey(ctx, "TaskList", "default", 0, nil)
	key := datastore.NewIncompleteKey(ctx, "Task", parentKey)

	task := Task{
		Category:    "Personal",
		Done:        false,
		Priority:    4,
		Description: "Learn Cloud Datastore",
	}

	// A complete key is assigned to the entity when it is Put.
	var err error
	key, err = client.Put(ctx, key, &task)
	// [END entity_with_parent]
	_ = err // Make sure you check err.
}
Example #9
0
func ExampleNewIncompleteKey() {
	ctx := context.Background()
	k := datastore.NewIncompleteKey(ctx, "Article", nil)
	_ = k // TODO: Use incomplete key.
}