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Exporter une copie de l'ensemble ou d'un sous-ensemble d'entités

Exporte une copie de l'ensemble ou d'un sous-ensemble d'entités de Datastore vers un autre système de stockage, tel que Cloud Storage.

Exemple de code

C#

Pour savoir comment installer et utiliser la bibliothèque cliente pour le mode Datastore, consultez la section Bibliothèques clientes en mode Datastore. Pour en savoir plus, consultez la documentation de référence de l'API C# en mode Datastore.

Pour vous authentifier auprès du mode Datastore, configurez les Identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.


using Google.Cloud.Datastore.Admin.V1;
using System;
using System.Collections.Generic;

public class ExportEntitiesSample
{
    public string ExportEntities(
        string projectId = "your-project-id",
        string outputUrlPrefix = "gs://your-bucket-name",
        string kind = "Task",
        string namespaceId = "default")
    {
        // Create client
        DatastoreAdminClient datastoreAdminClient = DatastoreAdminClient.Create();

        IDictionary<string, string> labels = new Dictionary<string, string> { { "cloud_datastore_samples", "true" }, };
        EntityFilter entityFilter = new EntityFilter
        {
            Kinds = { kind },
            NamespaceIds = { namespaceId }
        };

        var response = datastoreAdminClient.ExportEntities(projectId, labels, entityFilter, outputUrlPrefix);

        // Poll until the returned long-running operation is complete
        var completedResponse = response.PollUntilCompleted();

        if (completedResponse.IsFaulted)
        {
            Console.WriteLine($"Error while Exporting Entities: {completedResponse.Exception}");
            throw completedResponse.Exception;
        }

        Console.WriteLine($"Entities exported successfully.");

        ExportEntitiesResponse result = completedResponse.Result;

        return result.OutputUrl;
    }
}

Go

import (
	"context"
	"fmt"
	"io"

	admin "cloud.google.com/go/datastore/admin/apiv1"
	"cloud.google.com/go/datastore/admin/apiv1/adminpb"
)

// entitiesExport exports a copy of all or a subset of entities from
// Datastore to another storage system, such as Cloud Storage.
func entitiesExport(w io.Writer, projectID, outputURLPrefix string) (*adminpb.ExportEntitiesResponse, error) {
	// projectID := "project-id"
	// outputURLPrefix := "gs://bucket-name"
	ctx := context.Background()
	client, err := admin.NewDatastoreAdminClient(ctx)
	if err != nil {
		return nil, fmt.Errorf("admin.NewDatastoreAdminClient: %w", err)
	}
	defer client.Close()

	req := &adminpb.ExportEntitiesRequest{
		ProjectId:       projectID,
		OutputUrlPrefix: outputURLPrefix,
	}
	op, err := client.ExportEntities(ctx, req)
	if err != nil {
		return nil, fmt.Errorf("ExportEntities: %w", err)
	}
	resp, err := op.Wait(ctx)
	if err != nil {
		return nil, fmt.Errorf("Wait: %w", err)
	}
	fmt.Fprintln(w, "Entities were exported")
	return resp, nil
}

Node.js

const {Datastore} = require('@google-cloud/datastore');
const datastore = new Datastore();

async function exportEntities() {
  /**
   * TODO(developer): Uncomment these variables before running the sample.
   */
  // const bucket = 'YOUR_BUCKET_NAME';

  const [exportOperation] = await datastore.export({bucket});
  await exportOperation.promise();

  // The export operation has created a new file in your bucket, e.g.
  // gs://{YOUR_BUCKET_NAME}/{timestamp}/{timestamp}.overall_export.metadata
  console.log(`Export file created: ${exportOperation.result.outputUrl}`);

  // You may also choose to include only specific kinds and namespaces.
  const [specificExportOperation] = await datastore.export({
    bucket,
    kinds: ['Employee', 'Task'],
    namespaces: ['Company'],
  });
  await specificExportOperation.promise();
  console.log(specificExportOperation.result.outputUrl);
}

exportEntities();

Python

def export_entities(project_id, output_url_prefix):
    """
    Exports a copy of all or a subset of entities from
    Datastore to another storage system, such as Cloud Storage.
    """
    # project_id = "project-id"
    # output_url_prefix = "gs://bucket-name"
    client = DatastoreAdminClient()

    op = client.export_entities(
        {"project_id": project_id, "output_url_prefix": output_url_prefix}
    )
    response = op.result(timeout=300)

    print("Entities were exported\n")
    return response

Ruby

# project_id = "project-id"
# output_url_prefix = "gs://bucket-name"
op = client.export_entities project_id: project_id, output_url_prefix: output_url_prefix

op.wait_until_done!
raise op.error.message if op.error?

response = op.response
# Process the response.

metadata = op.metadata
# Process the metadata.

puts "Entities were exported"

Étape suivante

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