Modificare i dati utilizzando la scrittura batch

Questa pagina descrive le richieste di scrittura batch di Spanner e come puoi utilizzarle per modificare i dati di Spanner.

Puoi utilizzare la scrittura batch di Spanner per inserire, aggiornare o eliminare più righe nelle tabelle di Spanner. La scrittura batch di Spanner supporta le scritture a bassa latenza senza un'operazione di lettura e restituisce le risposte man mano che le mutazioni vengono applicate in batch. Per utilizzare la scrittura batch, raggruppa le mutazioni correlate e tutte le mutazioni in un gruppo vengono eseguite in modo atomico. Le mutazioni tra i gruppi vengono applicate in un ordine non specificato e sono indipendenti l'una dall'altra (non atomiche). Spanner non deve attendere l'applicazione di tutte le mutazioni prima di inviare una risposta, il che significa che la scrittura batch consente un errore parziale. Puoi anche eseguire più scritture batch contemporaneamente. Per ulteriori informazioni, consulta la sezione Come utilizzare la scrittura batch.

Casi d'uso

La scrittura batch di Spanner è particolarmente utile se vuoi eseguire il commit di un numero elevato di scritture senza un'operazione di lettura, ma non richiedi una transazione atomica per tutte le mutazioni.

Se vuoi eseguire il batch delle richieste DML, utilizza DML batch per modificare i dati di Spanner. Per ulteriori informazioni sulle differenze tra DML e mutazioni, consulta Confronto tra DML e mutazioni.

Per le richieste di singola mutazione, ti consigliamo di utilizzare una transazione di lettura-scrittura con blocco.

Limitazioni

La scrittura batch di Spanner presenta le seguenti limitazioni:

  • La scrittura batch di Spanner non è disponibile tramite la Google Cloud console o Google Cloud CLI. È disponibile solo tramite le API REST e RPC e le librerie client di Spanner.

  • La protezione dalla riproduzione non è supportata tramite la scrittura batch. È possibile che le mutazioni vengano applicate più di una volta e una mutazione applicata più di una volta potrebbe causare un errore. Ad esempio, se viene riprodotta una mutazione di inserimento, potrebbe generare un errore di esistenza o, se utilizzi chiavi basate su timestamp di commit o generate nella mutazione, potrebbero essere aggiunte altre righe alla tabella. Ti consigliamo di strutturare le scritture in modo che siano idempotenti per evitare questo problema.

  • Non puoi eseguire il rollback di una richiesta di scrittura batch completata. Puoi annullare una richiesta di scrittura batch in corso. Se annulli una scrittura batch in corso, viene eseguito il rollback delle mutazioni nei gruppi non completati. Le mutazioni nei gruppi completati vengono eseguite nel database.

  • La dimensione massima per una richiesta di scrittura batch è la stessa del limite per una richiesta di commit. Per ulteriori informazioni, consulta Limiti per la creazione, la lettura, l'aggiornamento e l'eliminazione dei dati.

Come utilizzare la scrittura batch

Per utilizzare la scrittura batch, devi disporre dell'autorizzazione spanner.databases.write per il database che vuoi modificare. Puoi eseguire il batch delle mutazioni di scrittura in modo non atomico in una singola chiamata utilizzando una chiamata di richiesta API REST o RPC.

Quando utilizzi la scrittura batch, devi raggruppare i seguenti tipi di mutazione:

  • Inserimento di righe con lo stesso prefisso della chiave primaria nelle tabelle padre e figlio.
  • Inserimento di righe nelle tabelle con una relazione di chiave esterna tra le tabelle.
  • Altri tipi di mutazioni correlate a seconda dello schema del database e della logica dell'applicazione.

Puoi anche eseguire la scrittura batch utilizzando le librerie client di Spanner. Il seguente esempio di codice aggiorna la tabella Singers con nuove righe.

Librerie client

C++ 

namespace spanner = ::google::cloud::spanner;
// Use upserts as mutation groups are not replay protected.
auto commit_results = client.CommitAtLeastOnce({
    // group #0
    spanner::Mutations{
        spanner::InsertOrUpdateMutationBuilder(
            "Singers", {"SingerId", "FirstName", "LastName"})
            .EmplaceRow(16, "Scarlet", "Terry")
            .Build(),
    },
    // group #1
    spanner::Mutations{
        spanner::InsertOrUpdateMutationBuilder(
            "Singers", {"SingerId", "FirstName", "LastName"})
            .EmplaceRow(17, "Marc", "")
            .EmplaceRow(18, "Catalina", "Smith")
            .Build(),
        spanner::InsertOrUpdateMutationBuilder(
            "Albums", {"SingerId", "AlbumId", "AlbumTitle"})
            .EmplaceRow(17, 1, "Total Junk")
            .EmplaceRow(18, 2, "Go, Go, Go")
            .Build(),
    },
});
for (auto& commit_result : commit_results) {
  if (!commit_result) throw std::move(commit_result).status();
  std::cout << "Mutation group indexes [";
  for (auto index : commit_result->indexes) std::cout << " " << index;
  std::cout << " ]: ";
  if (commit_result->commit_timestamp) {
    auto const& ts = *commit_result->commit_timestamp;
    std::cout << "Committed at " << ts.get<absl::Time>().value();
  } else {
    std::cout << commit_result->commit_timestamp.status();
  }
  std::cout << "\n";
}

C#

// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.


using Google.Cloud.Spanner.Data;
using Google.Rpc;
using Google.Cloud.Spanner.V1;
using Google.Protobuf.WellKnownTypes;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

public class BatchWriteAtLeastOnceAsyncSample
{
    public async Task BatchWriteAtLeastOnceAsync(string projectId, string instanceId, string databaseId)
    {
        string connectionString = $"Data Source=projects/{projectId}/instances/{instanceId}/databases/{databaseId}";

        using var connection = new SpannerConnection(connectionString);
        await connection.OpenAsync();

        // 1. Create a SpannerBatchWriteCommand.
        var cmd = connection.CreateBatchWriteCommand();

        // 2. Create and add mutation groups.
        // Mutation group 1: Insert or update a singer (16).
        var cmdSinger1 = connection.CreateInsertOrUpdateCommand("Singers", new SpannerParameterCollection
        {
            { "SingerId", SpannerDbType.Int64, 16 },
            { "FirstName", SpannerDbType.String, "Scarlet" },
            { "LastName", SpannerDbType.String, "Terry" }
        });
        cmd.Add(cmdSinger1);

        // Mutation group 2: Insert or update multiple singers and albums together.
        var cmdSinger2 = connection.CreateInsertOrUpdateCommand("Singers", new SpannerParameterCollection
        {
            { "SingerId", SpannerDbType.Int64, 17 },
            { "FirstName", SpannerDbType.String, "Marc" },
            { "LastName", SpannerDbType.String, "Smith" }
        });

        var cmdSinger3 = connection.CreateInsertOrUpdateCommand("Singers", new SpannerParameterCollection
        {
            { "SingerId", SpannerDbType.Int64, 18 },
            { "FirstName", SpannerDbType.String, "Catalina" },
            { "LastName", SpannerDbType.String, "Smith" }
        });

        var cmdAlbum1 = connection.CreateInsertOrUpdateCommand("Albums", new SpannerParameterCollection
        {
            { "SingerId", SpannerDbType.Int64, 17 },
            { "AlbumId", SpannerDbType.Int64, 1 },
            { "AlbumTitle", SpannerDbType.String, "Total Junk" }
        });

        var cmdAlbum2 = connection.CreateInsertOrUpdateCommand("Albums", new SpannerParameterCollection
        {
            { "SingerId", SpannerDbType.Int64, 18 },
            { "AlbumId", SpannerDbType.Int64, 2 },
            { "AlbumTitle", SpannerDbType.String, "Go, Go, Go" }
        });

        // Add multiple commands to the same group.
        cmd.Add(cmdSinger2, cmdSinger3, cmdAlbum1, cmdAlbum2);

        // 3. Execute the batch write request.
        try
        {
            // ExecuteNonQueryAsync returns an IAsyncEnumerable of BatchWriteResponse.
            await foreach (var response in cmd.ExecuteNonQueryAsync())
            {
                if (response.Status?.Code == (int)Code.Ok)
                {
                    Console.WriteLine($"Mutation group indexes {string.Join(", ", response.Indexes)} have been applied with commit timestamp {response.CommitTimestamp}");
                }
                else
                {
                    Console.WriteLine($"Mutation group indexes {string.Join(", ", response.Indexes)} could not be applied with error code {response.Status?.Code}");
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error executing batch write: {ex.Message}");
            throw;
        }
    }
}

Go 


import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/spanner"
	sppb "cloud.google.com/go/spanner/apiv1/spannerpb"
	"google.golang.org/grpc/status"
)

// batchWrite demonstrates writing mutations to a Spanner database through
// BatchWrite API - https://pkg.go.dev/cloud.google.com/go/spanner#Client.BatchWrite
func batchWrite(w io.Writer, db string) error {
	// db := "projects/my-project/instances/my-instance/databases/my-database"
	ctx := context.Background()
	client, err := spanner.NewClient(ctx, db)
	if err != nil {
		return err
	}
	defer client.Close()

	// Database is assumed to exist - https://cloud.google.com/spanner/docs/getting-started/go#create_a_database
	singerColumns := []string{"SingerId", "FirstName", "LastName"}
	albumColumns := []string{"SingerId", "AlbumId", "AlbumTitle"}
	mutationGroups := make([]*spanner.MutationGroup, 2)

	mutationGroup1 := []*spanner.Mutation{
		spanner.InsertOrUpdate("Singers", singerColumns, []interface{}{16, "Scarlet", "Terry"}),
	}
	mutationGroups[0] = &spanner.MutationGroup{Mutations: mutationGroup1}

	mutationGroup2 := []*spanner.Mutation{
		spanner.InsertOrUpdate("Singers", singerColumns, []interface{}{17, "Marc", ""}),
		spanner.InsertOrUpdate("Singers", singerColumns, []interface{}{18, "Catalina", "Smith"}),
		spanner.InsertOrUpdate("Albums", albumColumns, []interface{}{17, 1, "Total Junk"}),
		spanner.InsertOrUpdate("Albums", albumColumns, []interface{}{18, 2, "Go, Go, Go"}),
	}
	mutationGroups[1] = &spanner.MutationGroup{Mutations: mutationGroup2}
	iter := client.BatchWrite(ctx, mutationGroups)
	// See https://pkg.go.dev/cloud.google.com/go/spanner#BatchWriteResponseIterator.Do
	doFunc := func(response *sppb.BatchWriteResponse) error {
		if err = status.ErrorProto(response.GetStatus()); err == nil {
			fmt.Fprintf(w, "Mutation group indexes %v have been applied with commit timestamp %v",
				response.GetIndexes(), response.GetCommitTimestamp())
		} else {
			fmt.Fprintf(w, "Mutation group indexes %v could not be applied with error %v",
				response.GetIndexes(), err)
		}
		// Return an actual error as needed.
		return nil
	}
	return iter.Do(doFunc)
}

Java 


import com.google.api.gax.rpc.ServerStream;
import com.google.cloud.spanner.DatabaseClient;
import com.google.cloud.spanner.DatabaseId;
import com.google.cloud.spanner.Mutation;
import com.google.cloud.spanner.MutationGroup;
import com.google.cloud.spanner.Options;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerOptions;
import com.google.common.collect.ImmutableList;
import com.google.rpc.Code;
import com.google.spanner.v1.BatchWriteResponse;

public class BatchWriteAtLeastOnceSample {

  /***
   * Assume DDL for the underlying database:
   * <pre>{@code
   *   CREATE TABLE Singers (
   *     SingerId   INT64 NOT NULL,
   *     FirstName  STRING(1024),
   *     LastName   STRING(1024),
   *   ) PRIMARY KEY (SingerId)
   *
   *   CREATE TABLE Albums (
   *     SingerId     INT64 NOT NULL,
   *     AlbumId      INT64 NOT NULL,
   *     AlbumTitle   STRING(1024),
   *   ) PRIMARY KEY (SingerId, AlbumId),
   *   INTERLEAVE IN PARENT Singers ON DELETE CASCADE
   * }</pre>
   */

  private static final MutationGroup MUTATION_GROUP1 =
      MutationGroup.of(
          Mutation.newInsertOrUpdateBuilder("Singers")
              .set("SingerId")
              .to(16)
              .set("FirstName")
              .to("Scarlet")
              .set("LastName")
              .to("Terry")
              .build());
  private static final MutationGroup MUTATION_GROUP2 =
      MutationGroup.of(
          Mutation.newInsertOrUpdateBuilder("Singers")
              .set("SingerId")
              .to(17)
              .set("FirstName")
              .to("Marc")
              .build(),
          Mutation.newInsertOrUpdateBuilder("Singers")
              .set("SingerId")
              .to(18)
              .set("FirstName")
              .to("Catalina")
              .set("LastName")
              .to("Smith")
              .build(),
          Mutation.newInsertOrUpdateBuilder("Albums")
              .set("SingerId")
              .to(17)
              .set("AlbumId")
              .to(1)
              .set("AlbumTitle")
              .to("Total Junk")
              .build(),
          Mutation.newInsertOrUpdateBuilder("Albums")
              .set("SingerId")
              .to(18)
              .set("AlbumId")
              .to(2)
              .set("AlbumTitle")
              .to("Go, Go, Go")
              .build());

  static void batchWriteAtLeastOnce() {
    // TODO(developer): Replace these variables before running the sample.
    final String projectId = "my-project";
    final String instanceId = "my-instance";
    final String databaseId = "my-database";
    batchWriteAtLeastOnce(projectId, instanceId, databaseId);
  }

  static void batchWriteAtLeastOnce(String projectId, String instanceId, String databaseId) {
    try (Spanner spanner =
        SpannerOptions.newBuilder().setProjectId(projectId).build().getService()) {
      DatabaseId dbId = DatabaseId.of(projectId, instanceId, databaseId);
      final DatabaseClient dbClient = spanner.getDatabaseClient(dbId);

      // Creates and issues a BatchWrite RPC request that will apply the mutation groups
      // non-atomically and respond back with a stream of BatchWriteResponse.
      ServerStream<BatchWriteResponse> responses =
          dbClient.batchWriteAtLeastOnce(
              ImmutableList.of(MUTATION_GROUP1, MUTATION_GROUP2),
              Options.tag("batch-write-tag"));

      // Iterates through the results in the stream response and prints the MutationGroup indexes,
      // commit timestamp and status.
      for (BatchWriteResponse response : responses) {
        if (response.getStatus().getCode() == Code.OK_VALUE) {
          System.out.printf(
              "Mutation group indexes %s have been applied with commit timestamp %s",
              response.getIndexesList(), response.getCommitTimestamp());
        } else {
          System.out.printf(
              "Mutation group indexes %s could not be applied with error code %s and "
                  + "error message %s", response.getIndexesList(),
              Code.forNumber(response.getStatus().getCode()), response.getStatus().getMessage());
        }
      }
    }
  }
}

Nodo 


// Imports the Google Cloud client library
const {Spanner, MutationGroup} = require('@google-cloud/spanner');

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// const instanceId = 'my-instance';
// const databaseId = 'my-database';
// const projectId = 'my-project-id';

// Creates a client
const spanner = new Spanner({
  projectId: projectId,
});

// Gets a reference to a Cloud Spanner instance and database
const instance = spanner.instance(instanceId);
const database = instance.database(databaseId);

// Create Mutation Groups
/**
 * Related mutations should be placed in a group, such as insert mutations for both a parent and a child row.
 * A group must contain related mutations.
 * Please see {@link https://cloud.google.com/spanner/docs/reference/rpc/google.spanner.v1#google.spanner.v1.BatchWriteRequest.MutationGroup}
 * for more details and examples.
 */
const mutationGroup1 = new MutationGroup();
mutationGroup1.insert('Singers', {
  SingerId: 1,
  FirstName: 'Scarlet',
  LastName: 'Terry',
});

const mutationGroup2 = new MutationGroup();
mutationGroup2.insert('Singers', {
  SingerId: 2,
  FirstName: 'Marc',
});
mutationGroup2.insert('Singers', {
  SingerId: 3,
  FirstName: 'Catalina',
  LastName: 'Smith',
});
mutationGroup2.insert('Albums', {
  AlbumId: 1,
  SingerId: 2,
  AlbumTitle: 'Total Junk',
});
mutationGroup2.insert('Albums', {
  AlbumId: 2,
  SingerId: 3,
  AlbumTitle: 'Go, Go, Go',
});

const options = {
  transactionTag: 'batch-write-tag',
};

try {
  database
    .batchWriteAtLeastOnce([mutationGroup1, mutationGroup2], options)
    .on('error', console.error)
    .on('data', response => {
      // Check the response code of each response to determine whether the mutation group(s) were applied successfully.
      if (response.status.code === 0) {
        console.log(
          `Mutation group indexes ${
            response.indexes
          }, have been applied with commit timestamp ${Spanner.timestamp(
            response.commitTimestamp,
          ).toJSON()}`,
        );
      }
      // Mutation groups that fail to commit trigger a response with a non-zero status code.
      else {
        console.log(
          `Mutation group indexes ${response.indexes}, could not be applied with error code ${response.status.code}, and error message ${response.status.message}`,
        );
      }
    })
    .on('end', () => {
      console.log('Request completed successfully');
    });
} catch (err) {
  console.log(err);
}

PHP

<?php
/**
 * Copyright 2026 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * For instructions on how to run the full sample:
 *
 * @see https://github.com/GoogleCloudPlatform/php-docs-samples/tree/main/spanner/README.md
 */

namespace Google\Cloud\Samples\Spanner;

use Google\Cloud\Spanner\SpannerClient;

/**
 * Inserts sample data into the given database via BatchWrite API.
 * The database and table must already exist and can be created using `create_database`.
 *
 * Example:
 * ```
 * batch_write($projectId, $instanceId, $databaseId);
 * ```
 *
 * @param string $projectId The Google Cloud project ID.
 * @param string $instanceId The Spanner instance ID.
 * @param string $databaseId The Spanner database ID.
 */
function batch_write(string $projectId, string $instanceId, string $databaseId): void
{
    $spanner = new SpannerClient(['projectId' => $projectId]);
    $database = $spanner->instance($instanceId)->database($databaseId);

    // Create Mutation Groups
    // All mutations within a single group are applied atomically.
    // Mutations across groups are applied non-atomically.

    // Group 1: Single mutation
    $mutationGroup1 = $database->mutationGroup();
    $mutationGroup1->insertOrUpdate('Singers', [
        'SingerId' => 16,
        'FirstName' => 'Scarlet',
        'LastName' => 'Terry'
    ]);

    // Group 2: Multiple mutations
    $mutationGroup2 = $database->mutationGroup();
    $mutationGroup2->insertOrUpdateBatch('Singers', [
        ['SingerId' => 17, 'FirstName' => 'Marc'],
        ['SingerId' => 18, 'FirstName' => 'Catalina', 'LastName' => 'Smith']
    ]);
    $mutationGroup2->insertOrUpdateBatch('Albums', [
        ['SingerId' => 17, 'AlbumId' => 1, 'AlbumTitle' => 'Total Junk'],
        ['SingerId' => 18, 'AlbumId' => 2, 'AlbumTitle' => 'Go, Go, Go']
    ]);

    // Call batchWrite on the high-level Database client.
    // Equivalent to batchWriteAtLeastOnce in other languages.
    $responses = $database->batchWrite([$mutationGroup1, $mutationGroup2], [
        'requestOptions' => ['transactionTag' => 'batch-write-tag']
    ]);

    // Check the response code of each response to determine whether the mutation group(s) were applied successfully.
    // $responses is a Generator yielding V1\BatchWriteResponse items.
    // Check the response code of each response to determine whether the mutation group(s) were applied successfully.
    // $responses is a Generator yielding response arrays.
    foreach ($responses as $response) {
        $status = $response['status'];
        $indexes = implode(', ', $response['indexes']);
        if ($status['code'] === 0) {
            $timestamp = $response['commitTimestamp'] ?? 'Unknown';
            printf('Mutation group indexes [%s] have been applied with commit timestamp %s' . PHP_EOL,
                $indexes,
                $timestamp
            );
        } else {
            printf('Mutation group indexes [%s] could not be applied with error code %s and error message %s' . PHP_EOL,
                $indexes,
                $status['code'],
                $status['message']
            );
        }
    }
}

// The following 2 lines are only needed to run the samples
require_once __DIR__ . '/../../testing/sample_helpers.php';
\Google\Cloud\Samples\execute_sample(__FILE__, __NAMESPACE__, $argv);

Python 

def batch_write(instance_id, database_id):
    """Inserts sample data into the given database via BatchWrite API.

    The database and table must already exist and can be created using
    `create_database`.
    """
    from google.rpc.code_pb2 import OK

    spanner_client = spanner.Client()
    instance = spanner_client.instance(instance_id)
    database = instance.database(database_id)

    with database.mutation_groups() as groups:
        group1 = groups.group()
        group1.insert_or_update(
            table="Singers",
            columns=("SingerId", "FirstName", "LastName"),
            values=[
                (16, "Scarlet", "Terry"),
            ],
        )

        group2 = groups.group()
        group2.insert_or_update(
            table="Singers",
            columns=("SingerId", "FirstName", "LastName"),
            values=[
                (17, "Marc", ""),
                (18, "Catalina", "Smith"),
            ],
        )
        group2.insert_or_update(
            table="Albums",
            columns=("SingerId", "AlbumId", "AlbumTitle"),
            values=[
                (17, 1, "Total Junk"),
                (18, 2, "Go, Go, Go"),
            ],
        )

        for response in groups.batch_write():
            if response.status.code == OK:
                print(
                    "Mutation group indexes {} have been applied with commit timestamp {}".format(
                        response.indexes, response.commit_timestamp
                    )
                )
            else:
                print(
                    "Mutation group indexes {} could not be applied with error {}".format(
                        response.indexes, response.status
                    )
                )

Ruby

require "google/cloud/spanner"

##
# This is a snippet for showcasing how to apply a batch of mutations groups.
# All mutations in a group are applied atomically.
#
# @param project_id  [String] The ID of the Google Cloud project.
# @param instance_id [String] The ID of the spanner instance.
# @param database_id [String] The ID of the database.
#
def spanner_batch_write project_id:, instance_id:, database_id:
  spanner = Google::Cloud::Spanner.new project: project_id
  client  = spanner.client instance_id, database_id

  results = client.batch_write do |b|
    # First mutation group
    b.mutation_group do |mg|
      mg.upsert "Singers", [{ SingerId: 16, FirstName: "Scarlet", LastName: "Terry" }]
    end

    # Second mutation group
    b.mutation_group do |mg|
      mg.upsert "Singers", [
        { SingerId: 17, FirstName: "Marc" },
        { SingerId: 18, FirstName: "Catalina", LastName: "Smith" }
      ]
      mg.upsert "Albums", [
        { SingerId: 17, AlbumId: 1, AlbumTitle: "Total Junk" },
        { SingerId: 18, AlbumId: 2, AlbumTitle: "Go, Go, Go" }
      ]
    end
  end

  results.each do |response|
    if response.ok?
      puts "Mutation group indexes applied: #{response.indexes}"
    else
      puts "Mutation group failed to apply: #{response.indexes}"
      puts "Error: #{response.status.message}"
    end
  end
end

Passaggi successivi