Agrega la columna NUMERIC

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Para actualizar un esquema, agrega una columna NUMERIC.

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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. 

void AddNumericColumn(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);
  auto metadata = client
                      .UpdateDatabaseDdl(database.FullName(), {R"""(
                        ALTER TABLE Venues ADD COLUMN Revenue NUMERIC)"""})
                      .get();
  google::cloud::spanner_testing::LogUpdateDatabaseDdl(  //! TODO(#4758)
      client, database, metadata.status());              //! TODO(#4758)
  if (!metadata) throw std::move(metadata).status();
  std::cout << "`Venues` table altered, new DDL:\n" << metadata->DebugString();
}

C#

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


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

public class AddNumericColumnAsyncSample
{
    public async Task AddNumericColumnAsync(string projectId, string instanceId, string databaseId)
    {
        string connectionString = $"Data Source=projects/{projectId}/instances/{instanceId}/databases/{databaseId}";
        string alterStatement = "ALTER TABLE Venues ADD COLUMN Revenue NUMERIC";

        using var connection = new SpannerConnection(connectionString);
        using var updateCmd = connection.CreateDdlCommand(alterStatement);
        await updateCmd.ExecuteNonQueryAsync();
        Console.WriteLine("Added the Revenue column.");
    }
}

Go

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


import (
	"context"
	"fmt"
	"io"

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

func addNumericColumn(ctx context.Context, w io.Writer, db string) error {
	adminClient, err := database.NewDatabaseAdminClient(ctx)
	if err != nil {
		return err
	}
	defer adminClient.Close()

	op, err := adminClient.UpdateDatabaseDdl(ctx, &adminpb.UpdateDatabaseDdlRequest{
		Database: db,
		Statements: []string{
			"ALTER TABLE Venues ADD COLUMN Revenue NUMERIC",
		},
	})
	if err != nil {
		return err
	}
	if err := op.Wait(ctx); err != nil {
		return err
	}
	fmt.Fprintf(w, "Added Revenue column\n")
	return nil
}

Java

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

import com.google.api.gax.longrunning.OperationFuture;
import com.google.cloud.spanner.DatabaseAdminClient;
import com.google.cloud.spanner.Spanner;
import com.google.cloud.spanner.SpannerOptions;
import com.google.common.collect.ImmutableList;
import com.google.spanner.admin.database.v1.UpdateDatabaseDdlMetadata;
import java.util.concurrent.ExecutionException;

class AddNumericColumnSample {

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

    try (Spanner spanner =
        SpannerOptions.newBuilder().setProjectId(projectId).build().getService()) {
      DatabaseAdminClient adminClient = spanner.getDatabaseAdminClient();
      addNumericColumn(adminClient, instanceId, databaseId);
    }
  }

  static void addNumericColumn(
      DatabaseAdminClient adminClient, String instanceId, String databaseId)
      throws InterruptedException, ExecutionException {
    OperationFuture<Void, UpdateDatabaseDdlMetadata> operation =
        adminClient.updateDatabaseDdl(
            instanceId,
            databaseId,
            ImmutableList.of("ALTER TABLE Venues ADD COLUMN Revenue NUMERIC"),
            null);
    // Wait for the operation to finish.
    // This will throw an ExecutionException if the operation fails.
    operation.get();
    System.out.printf("Successfully added column `Revenue`%n");
  }
}

Node.js

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

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

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

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

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

const request = ['ALTER TABLE Venues ADD COLUMN Revenue NUMERIC'];

// Alter existing table to add a column.
const [operation] = await database.updateSchema(request);

console.log(`Waiting for operation on ${databaseId} to complete...`);

await operation.promise();

console.log(
  `Added Revenue column to Venues table in database ${databaseId}.`
);

PHP

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

use Google\Cloud\Spanner\SpannerClient;

/**
 * Adds a NUMERIC column to a table.
 * Example:
 * ```
 * add_numeric_column($instanceId, $databaseId);
 * ```
 *
 * @param string $instanceId The Spanner instance ID.
 * @param string $databaseId The Spanner database ID.
 */
function add_numeric_column(string $instanceId, string $databaseId): void
{
    $spanner = new SpannerClient();
    $instance = $spanner->instance($instanceId);
    $database = $instance->database($databaseId);

    $operation = $database->updateDdl(
        'ALTER TABLE Venues ADD COLUMN Revenue NUMERIC'
    );

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

    printf('Added Revenue as a NUMERIC column in Venues table' . PHP_EOL);
}

Python

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

def add_numeric_column(instance_id, database_id):
    """Adds a new NUMERIC column to the Venues table in the example database."""
    spanner_client = spanner.Client()
    instance = spanner_client.instance(instance_id)

    database = instance.database(database_id)

    operation = database.update_ddl(["ALTER TABLE Venues ADD COLUMN Revenue NUMERIC"])

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

    print(
        'Altered table "Venues" on database {} on instance {}.'.format(
            database_id, instance_id
        )
    )

Ruby

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

# 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

db_path = database_admin_client.database_path project: project_id,
                                              instance: instance_id,
                                              database: database_id

job = database_admin_client.update_database_ddl database: db_path,
                                                statements: [
                                                  "ALTER TABLE Venues ADD COLUMN Revenue NUMERIC"
                                                ]

puts "Waiting for database update to complete"

job.wait_until_done!

puts "Added the Revenue as a numeric column in Venues table"

¿Qué sigue?

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