ลบข้อมูลจาก Cloud Firestore

// asynchronously delete a document
ApiFuture<WriteResult> writeResult = db.collection("cities").document("DC").delete();
// ...
System.out.println("Update time : " + writeResult.get().getUpdateTime());
ManageDataSnippets.java

db.collection("cities").document("DC").delete()
snippets.py

await db.collection("cities").document("DC").delete()
snippets.py

const res = await db.collection('cities').doc('DC').delete();
index.js

import (
	"context"
	"log"

	"cloud.google.com/go/firestore"
)

func deleteDoc(ctx context.Context, client *firestore.Client) error {
	_, err := client.Collection("cities").Doc("DC").Delete(ctx)
	if err != nil {
		// Handle any errors in an appropriate way, such as returning them.
		log.Printf("An error has occurred: %s", err)
	}

	return err
}
save_data_delete_doc.go

$db->collection('samples/php/cities')->document('DC')->delete();
data_delete_doc.php

DocumentReference cityRef = db.Collection("cities").Document("DC");
await cityRef.DeleteAsync();
Program.cs

city_ref = firestore.doc "#{collection_path}/DC"
city_ref.delete
delete_data.rb

DocumentReference docRef = db.collection("cities").document("BJ");
Map<String, Object> updates = new HashMap<>();
updates.put("capital", FieldValue.delete());
// Update and delete the "capital" field in the document
ApiFuture<WriteResult> writeResult = docRef.update(updates);
System.out.println("Update time : " + writeResult.get());
ManageDataSnippets.java

city_ref = db.collection("cities").document("BJ")
city_ref.update({"capital": firestore.DELETE_FIELD})
snippets.py

city_ref = db.collection("cities").document("BJ")
await city_ref.update({"capital": firestore.DELETE_FIELD})
snippets.py

// Create a document reference
const cityRef = db.collection('cities').doc('BJ');

// Remove the 'capital' field from the document
const res = await cityRef.update({
  capital: FieldValue.delete()
});
index.js

import (
	"context"
	"log"

	"cloud.google.com/go/firestore"
)

func deleteField(ctx context.Context, client *firestore.Client) error {
	_, err := client.Collection("cities").Doc("BJ").Update(ctx, []firestore.Update{
		{
			Path:  "capital",
			Value: firestore.Delete,
		},
	})
	if err != nil {
		// Handle any errors in an appropriate way, such as returning them.
		log.Printf("An error has occurred: %s", err)
	}

	// ...
	return err
}
save_data_delete_field.go

$cityRef = $db->collection('samples/php/cities')->document('BJ');
$cityRef->update([
    ['path' => 'capital', 'value' => FieldValue::deleteField()]
]);
data_delete_field.php

DocumentReference cityRef = db.Collection("cities").Document("BJ");
Dictionary<string, object> updates = new Dictionary<string, object>
{
    { "Capital", FieldValue.Delete }
};
await cityRef.UpdateAsync(updates);
Program.cs

city_ref = firestore.doc "#{collection_path}/BJ"
city_ref.update({ capital: firestore.field_delete })
delete_data.rb

import com.google.api.core.ApiFuture;
import com.google.cloud.firestore.CollectionReference;
import com.google.cloud.firestore.Firestore;
import com.google.cloud.firestore.FirestoreOptions;

public class DeleteCollection {

  /**
   * Delete a collection and all its subcollections.
   *
   * @param projectId The Google Cloud project ID
   * @param collectionName The name of the collection to delete
   */
  public static void deleteCollection(String projectId, String collectionName) throws Exception {
    FirestoreOptions firestoreOptions =
        FirestoreOptions.getDefaultInstance().toBuilder().setProjectId(projectId).build();
    try (Firestore db = firestoreOptions.getService()) {
      CollectionReference collection = db.collection(collectionName);

      ApiFuture<Void> future = db.recursiveDelete(collection);

      future.get();
      System.out.println("Collection and all its subcollections deleted successfully.");
    }
  }

  public static void main(String[] args) throws Exception {
    String projectId = "example-project-id";
    String collectionName = "example-collection-name";

    deleteCollection(projectId, collectionName);
  }
}
DeleteCollection.java

def delete_collection(coll_ref):

    print(f"Recursively deleting collection: {coll_ref}")
    db.recursive_delete(coll_ref)
snippets.py

async def delete_collection(coll_ref):

    await db.recursive_delete(coll_ref)
snippets.py

async function deleteCollection(db, collectionPath) {
  const collectionRef = db.collection(collectionPath);
  return await db.recursiveDelete(collectionRef);
}
index.js

import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/firestore"
	"google.golang.org/api/iterator"
)

func deleteCollection(w io.Writer, projectID, collectionName string,
	batchSize int) error {

	// Instantiate a client
	ctx := context.Background()
	client, err := firestore.NewClient(ctx, projectID)
	if err != nil {
		return err
	}

	col := client.Collection(collectionName)
	bulkwriter := client.BulkWriter(ctx)

	for {
		// Get a batch of documents
		iter := col.Limit(batchSize).Documents(ctx)
		numDeleted := 0

		// Iterate through the documents, adding
		// a delete operation for each one to the BulkWriter.
		for {
			doc, err := iter.Next()
			if err == iterator.Done {
				break
			}
			if err != nil {
				return err
			}

			bulkwriter.Delete(doc.Ref)
			numDeleted++
		}

		// If there are no documents to delete,
		// the process is over.
		if numDeleted == 0 {
			bulkwriter.End()
			break
		}

		bulkwriter.Flush()
	}
	fmt.Fprintf(w, "Deleted collection \"%s\"", collectionName)
	return nil
}
save_data_delete_collection.go

function data_delete_collection(string $projectId, string $collectionName, int $batchSize)
{
    // Create the Cloud Firestore client
    $db = new FirestoreClient([
        'projectId' => $projectId,
    ]);
    $collectionReference = $db->collection($collectionName);
    $documents = $collectionReference->limit($batchSize)->documents();
    while (!$documents->isEmpty()) {
        foreach ($documents as $document) {
            printf('Deleting document %s' . PHP_EOL, $document->id());
            $document->reference()->delete();
        }
        $documents = $collectionReference->limit($batchSize)->documents();
    }
}
data_delete_collection.php

private static async Task DeleteCollection(CollectionReference collectionReference, int batchSize)
{
    QuerySnapshot snapshot = await collectionReference.Limit(batchSize).GetSnapshotAsync();
    IReadOnlyList<DocumentSnapshot> documents = snapshot.Documents;
    while (documents.Count > 0)
    {
        foreach (DocumentSnapshot document in documents)
        {
            Console.WriteLine("Deleting document {0}", document.Id);
            await document.Reference.DeleteAsync();
        }
        snapshot = await collectionReference.Limit(batchSize).GetSnapshotAsync();
        documents = snapshot.Documents;
    }
    Console.WriteLine("Finished deleting all documents from the collection.");
}
Program.cs

cities_ref = firestore.col collection_path
query      = cities_ref

query.get do |document_snapshot|
  puts "Deleting document #{document_snapshot.document_id}."
  document_ref = document_snapshot.ref
  document_ref.delete
end
delete_data.rb