Crear base de datos

Crear una base de datos.

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Para obtener documentación en la que se incluye esta muestra de código, consulta lo siguiente:

Muestra de código

C++

Para obtener información sobre cómo instalar y usar la biblioteca cliente de Spanner, consulta Bibliotecas cliente de Spanner.

Para autenticarte en Spanner, configura las credenciales predeterminadas de la aplicación. Si deseas obtener más información, consulta Configura la autenticación para un entorno de desarrollo local. 

void CreateDatabase(google::cloud::spanner_admin::DatabaseAdminClient client,
                    std::string const& project_id,
                    std::string const& instance_id,
                    std::string const& database_id) {
  google::cloud::spanner::Database database(project_id, instance_id,
                                            database_id);
  google::spanner::admin::database::v1::CreateDatabaseRequest request;
  request.set_parent(database.instance().FullName());
  request.set_create_statement("CREATE DATABASE `" + database.database_id() +
                               "`");
  request.add_extra_statements(R"""(
      CREATE TABLE Singers (
          SingerId   INT64 NOT NULL,
          FirstName  STRING(1024),
          LastName   STRING(1024),
          SingerInfo BYTES(MAX),
          FullName   STRING(2049)
              AS (ARRAY_TO_STRING([FirstName, LastName], " ")) STORED
      ) PRIMARY KEY (SingerId))""");
  request.add_extra_statements(R"""(
      CREATE TABLE Albums (
          SingerId     INT64 NOT NULL,
          AlbumId      INT64 NOT NULL,
          AlbumTitle   STRING(MAX)
      ) PRIMARY KEY (SingerId, AlbumId),
          INTERLEAVE IN PARENT Singers ON DELETE CASCADE)""");
  auto db = client.CreateDatabase(request).get();
  if (!db) throw std::move(db).status();
  std::cout << "Database " << db->name() << " created.\n";
}

C#

Para obtener información sobre cómo instalar y usar la biblioteca cliente de Spanner, consulta Bibliotecas cliente de Spanner.

Para autenticarte en Spanner, configura las credenciales predeterminadas de la aplicación. Si deseas obtener más información, consulta Configura la autenticación para un entorno de desarrollo local. 


using Google.Cloud.Spanner.Data;
using System.Threading.Tasks;

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

        using var connection = new SpannerConnection(connectionString);
        var createDatabase = $"CREATE DATABASE `{databaseId}`";
        // Define create table statement for table #1.
        var createSingersTable =
        @"CREATE TABLE Singers (
                     SingerId INT64 NOT NULL,
                     FirstName STRING(1024),
                     LastName STRING(1024),
                     ComposerInfo BYTES(MAX),
                     FullName STRING(2048) AS (ARRAY_TO_STRING([FirstName, LastName], "" "")) STORED
                 ) PRIMARY KEY (SingerId)";
        // Define create table statement for table #2.
        var createAlbumsTable =
        @"CREATE TABLE Albums (
                     SingerId INT64 NOT NULL,
                     AlbumId INT64 NOT NULL,
                     AlbumTitle STRING(MAX)
                 ) PRIMARY KEY (SingerId, AlbumId),
                 INTERLEAVE IN PARENT Singers ON DELETE CASCADE";

        using var createDbCommand = connection.CreateDdlCommand(createDatabase, createSingersTable, createAlbumsTable);
        await createDbCommand.ExecuteNonQueryAsync();
    }
}

Go

Para obtener información sobre cómo instalar y usar la biblioteca cliente de Spanner, consulta Bibliotecas cliente de Spanner.

Para autenticarte en Spanner, configura las credenciales predeterminadas de la aplicación. Si deseas obtener más información, consulta Configura la autenticación para un entorno de desarrollo local. 

import (
	"context"
	"fmt"
	"io"
	"regexp"

	database "cloud.google.com/go/spanner/admin/database/apiv1"
	adminpb "google.golang.org/genproto/googleapis/spanner/admin/database/v1"
)

func createDatabase(ctx context.Context, w io.Writer, db string) error {
	matches := regexp.MustCompile("^(.*)/databases/(.*)$").FindStringSubmatch(db)
	if matches == nil || len(matches) != 3 {
		return fmt.Errorf("Invalid database id %s", db)
	}

	adminClient, err := database.NewDatabaseAdminClient(ctx)
	if err != nil {
		return err
	}
	defer adminClient.Close()

	op, err := adminClient.CreateDatabase(ctx, &adminpb.CreateDatabaseRequest{
		Parent:          matches[1],
		CreateStatement: "CREATE DATABASE `" + matches[2] + "`",
		ExtraStatements: []string{
			`CREATE TABLE Singers (
				SingerId   INT64 NOT NULL,
				FirstName  STRING(1024),
				LastName   STRING(1024),
				SingerInfo BYTES(MAX),
				FullName   STRING(2048) AS (
					ARRAY_TO_STRING([FirstName, LastName], " ")
				) STORED
			) PRIMARY KEY (SingerId)`,
			`CREATE TABLE Albums (
				SingerId     INT64 NOT NULL,
				AlbumId      INT64 NOT NULL,
				AlbumTitle   STRING(MAX)
			) PRIMARY KEY (SingerId, AlbumId),
			INTERLEAVE IN PARENT Singers ON DELETE CASCADE`,
		},
	})
	if err != nil {
		return err
	}
	if _, err := op.Wait(ctx); err != nil {
		return err
	}
	fmt.Fprintf(w, "Created database [%s]\n", db)
	return nil
}

Java

Para obtener información sobre cómo instalar y usar la biblioteca cliente de Spanner, consulta Bibliotecas cliente de Spanner.

Para autenticarte en Spanner, configura las credenciales predeterminadas de la aplicación. Si deseas obtener más información, consulta Configura la autenticación para un entorno de desarrollo local. 

static void createDatabase(DatabaseAdminClient dbAdminClient,
    InstanceName instanceName, String databaseId) {
  CreateDatabaseRequest createDatabaseRequest =
      CreateDatabaseRequest.newBuilder()
          .setCreateStatement("CREATE DATABASE `" + databaseId + "`")
          .setParent(instanceName.toString())
          .addAllExtraStatements(Arrays.asList(
              "CREATE TABLE Singers ("
                  + "  SingerId   INT64 NOT NULL,"
                  + "  FirstName  STRING(1024),"
                  + "  LastName   STRING(1024),"
                  + "  SingerInfo BYTES(MAX),"
                  + "  FullName STRING(2048) AS "
                  + "  (ARRAY_TO_STRING([FirstName, LastName], \" \")) STORED"
                  + ") PRIMARY KEY (SingerId)",
              "CREATE TABLE Albums ("
                  + "  SingerId     INT64 NOT NULL,"
                  + "  AlbumId      INT64 NOT NULL,"
                  + "  AlbumTitle   STRING(MAX)"
                  + ") PRIMARY KEY (SingerId, AlbumId),"
                  + "  INTERLEAVE IN PARENT Singers ON DELETE CASCADE")).build();
  try {
    // Initiate the request which returns an OperationFuture.
    com.google.spanner.admin.database.v1.Database db =
        dbAdminClient.createDatabaseAsync(createDatabaseRequest).get();
    System.out.println("Created database [" + db.getName() + "]");
  } catch (ExecutionException e) {
    // If the operation failed during execution, expose the cause.
    throw (SpannerException) e.getCause();
  } catch (InterruptedException e) {
    // Throw when a thread is waiting, sleeping, or otherwise occupied,
    // and the thread is interrupted, either before or during the activity.
    throw SpannerExceptionFactory.propagateInterrupt(e);
  }
}

Node.js

Para obtener información sobre cómo instalar y usar la biblioteca cliente de Spanner, consulta Bibliotecas cliente de Spanner.

Para autenticarte en Spanner, configura las credenciales predeterminadas de la aplicación. Si deseas obtener más información, consulta Configura la autenticación para un entorno de desarrollo local. 


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

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

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

const databaseAdminClient = spanner.getDatabaseAdminClient();

const createSingersTableStatement = `
CREATE TABLE Singers (
  SingerId    INT64 NOT NULL,
  FirstName   STRING(1024),
  LastName    STRING(1024),
  SingerInfo  BYTES(MAX),
  FullName    STRING(2048) AS (ARRAY_TO_STRING([FirstName, LastName], " ")) STORED,
) PRIMARY KEY (SingerId)`;
const createAlbumsTableStatement = `
CREATE TABLE Albums (
  SingerId    INT64 NOT NULL,
  AlbumId     INT64 NOT NULL,
  AlbumTitle  STRING(MAX)
) PRIMARY KEY (SingerId, AlbumId),
INTERLEAVE IN PARENT Singers ON DELETE CASCADE`;

// Creates a new database
try {
  const [operation] = await databaseAdminClient.createDatabase({
    createStatement: 'CREATE DATABASE `' + databaseID + '`',
    extraStatements: [
      createSingersTableStatement,
      createAlbumsTableStatement,
    ],
    parent: databaseAdminClient.instancePath(projectID, instanceID),
  });

  console.log(`Waiting for creation of ${databaseID} to complete...`);
  await operation.promise();

  console.log(`Created database ${databaseID} on instance ${instanceID}.`);
} catch (err) {
  console.error('ERROR:', err);
}

PHP

Para obtener información sobre cómo instalar y usar la biblioteca cliente de Spanner, consulta Bibliotecas cliente de Spanner.

Para autenticarte en Spanner, configura las credenciales predeterminadas de la aplicación. Si deseas obtener más información, consulta Configura la autenticación para un entorno de desarrollo local. 

use Google\Cloud\Spanner\Admin\Database\V1\Client\DatabaseAdminClient;
use Google\Cloud\Spanner\Admin\Database\V1\CreateDatabaseRequest;

/**
 * Creates a database and tables for sample data.
 * Example:
 * ```
 * create_database($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 create_database(string $projectId, string $instanceId, string $databaseId): void
{
    $databaseAdminClient = new DatabaseAdminClient();
    $instance = $databaseAdminClient->instanceName($projectId, $instanceId);

    $operation = $databaseAdminClient->createDatabase(
        new CreateDatabaseRequest([
            'parent' => $instance,
            'create_statement' => sprintf('CREATE DATABASE `%s`', $databaseId),
            'extra_statements' => [
                'CREATE TABLE Singers (' .
                'SingerId     INT64 NOT NULL,' .
                'FirstName    STRING(1024),' .
                'LastName     STRING(1024),' .
                'SingerInfo   BYTES(MAX),' .
                'FullName     STRING(2048) AS' .
                '(ARRAY_TO_STRING([FirstName, LastName], " ")) STORED' .
                ') PRIMARY KEY (SingerId)',
                'CREATE TABLE Albums (' .
                    'SingerId     INT64 NOT NULL,' .
                    'AlbumId      INT64 NOT NULL,' .
                    'AlbumTitle   STRING(MAX)' .
                ') PRIMARY KEY (SingerId, AlbumId),' .
                'INTERLEAVE IN PARENT Singers ON DELETE CASCADE'
            ]
        ])
    );

    print('Waiting for operation to complete...' . PHP_EOL);
    $operation->pollUntilComplete();

    printf('Created database %s on instance %s' . PHP_EOL,
        $databaseId, $instanceId);
}

Python

Para obtener información sobre cómo instalar y usar la biblioteca cliente de Spanner, consulta Bibliotecas cliente de Spanner.

Para autenticarte en Spanner, configura las credenciales predeterminadas de la aplicación. Si deseas obtener más información, consulta Configura la autenticación para un entorno de desarrollo local. 

def create_database(instance_id, database_id):
    """Creates a database and tables for sample data."""
    from google.cloud.spanner_admin_database_v1.types import \
        spanner_database_admin

    spanner_client = spanner.Client()
    database_admin_api = spanner_client.database_admin_api

    request = spanner_database_admin.CreateDatabaseRequest(
        parent=database_admin_api.instance_path(spanner_client.project, instance_id),
        create_statement=f"CREATE DATABASE `{database_id}`",
        extra_statements=[
            """CREATE TABLE Singers (
            SingerId     INT64 NOT NULL,
            FirstName    STRING(1024),
            LastName     STRING(1024),
            SingerInfo   BYTES(MAX),
            FullName   STRING(2048) AS (
                ARRAY_TO_STRING([FirstName, LastName], " ")
            ) STORED
        ) PRIMARY KEY (SingerId)""",
            """CREATE TABLE Albums (
            SingerId     INT64 NOT NULL,
            AlbumId      INT64 NOT NULL,
            AlbumTitle   STRING(MAX)
        ) PRIMARY KEY (SingerId, AlbumId),
        INTERLEAVE IN PARENT Singers ON DELETE CASCADE""",
        ],
    )

    operation = database_admin_api.create_database(request=request)

    print("Waiting for operation to complete...")
    database = operation.result(OPERATION_TIMEOUT_SECONDS)

    print(
        "Created database {} on instance {}".format(
            database.name,
            database_admin_api.instance_path(spanner_client.project, instance_id),
        )
    )

Ruby

Para obtener información sobre cómo instalar y usar la biblioteca cliente de Spanner, consulta Bibliotecas cliente de Spanner.

Para autenticarte en Spanner, configura las credenciales predeterminadas de la aplicación. Si deseas obtener más información, consulta Configura la autenticación para un entorno de desarrollo local. 

# project_id  = "Your Google Cloud project ID"
# instance_id = "Your Spanner instance ID"
# database_id = "Your Spanner database ID"

require "google/cloud/spanner"
require "google/cloud/spanner/admin/database"

database_admin_client = Google::Cloud::Spanner::Admin::Database.database_admin

instance_path = database_admin_client.instance_path project: project_id, instance: instance_id

job = database_admin_client.create_database parent: instance_path,
                                            create_statement: "CREATE DATABASE `#{database_id}`",
                                            extra_statements: [
                                              "CREATE TABLE Singers (
      SingerId     INT64 NOT NULL,
      FirstName    STRING(1024),
      LastName     STRING(1024),
      SingerInfo   BYTES(MAX)
    ) PRIMARY KEY (SingerId)",

                                              "CREATE TABLE Albums (
      SingerId     INT64 NOT NULL,
      AlbumId      INT64 NOT NULL,
      AlbumTitle   STRING(MAX)
    ) PRIMARY KEY (SingerId, AlbumId),
    INTERLEAVE IN PARENT Singers ON DELETE CASCADE"
                                            ]

puts "Waiting for create database operation to complete"

job.wait_until_done!

puts "Created database #{database_id} on instance #{instance_id}"

¿Qué sigue?

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