Tabelle mit TIMESTAMP-Spalte erstellen

Tabelle mit einer TIMESTAMP-Spalte erstellen

Codebeispiel

C#

Informationen zum Installieren und Verwenden der Clientbibliothek für Cloud Spanner finden Sie unter Cloud Spanner-Clientbibliotheken.


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

public class CreateTableWithTimestampColumnAsyncSample
{
    public async Task CreateTableWithTimestampColumnAsync(string projectId, string instanceId, string databaseId)
    {
        string connectionString = $"Data Source=projects/{projectId}/instances/{instanceId}/databases/{databaseId}";
        using var connection = new SpannerConnection(connectionString);
        // Define create table statement for table with commit timestamp column.
        string createTableStatement =
        @"CREATE TABLE Performances (
                    SingerId       INT64 NOT NULL,
                    VenueId        INT64 NOT NULL,
                    EventDate      Date,
                    Revenue        INT64,
                    LastUpdateTime TIMESTAMP NOT NULL OPTIONS (allow_commit_timestamp=true)
                ) PRIMARY KEY (SingerId, VenueId, EventDate),
                    INTERLEAVE IN PARENT Singers ON DELETE CASCADE";
        var cmd = connection.CreateDdlCommand(createTableStatement);
        await cmd.ExecuteNonQueryAsync();
    }
}

C++

Informationen zum Installieren und Verwenden der Clientbibliothek für Cloud Spanner finden Sie unter Cloud Spanner-Clientbibliotheken.

void CreateTableWithTimestamp(
    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"""(
                        CREATE TABLE Performances (
                            SingerId        INT64 NOT NULL,
                            VenueId         INT64 NOT NULL,
                            EventDate       Date,
                            Revenue         INT64,
                            LastUpdateTime  TIMESTAMP NOT NULL OPTIONS
                                (allow_commit_timestamp=true)
                        ) PRIMARY KEY (SingerId, VenueId, EventDate),
                            INTERLEAVE IN PARENT Singers ON DELETE CASCADE)"""})
                      .get();
  if (!metadata) throw std::runtime_error(metadata.status().message());
  std::cout << "`Performances` table created, new DDL:\n"
            << metadata->DebugString();
}

Go

Informationen zum Installieren und Verwenden der Clientbibliothek für Cloud Spanner finden Sie unter Cloud Spanner-Clientbibliotheken.


import (
	"context"
	"fmt"
	"io"

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

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

	op, err := adminClient.UpdateDatabaseDdl(ctx, &adminpb.UpdateDatabaseDdlRequest{
		Database: db,
		Statements: []string{
			`CREATE TABLE Performances (
				SingerId        INT64 NOT NULL,
				VenueId         INT64 NOT NULL,
				EventDate       Date,
				Revenue         INT64,
				LastUpdateTime  TIMESTAMP NOT NULL OPTIONS (allow_commit_timestamp=true)
			) PRIMARY KEY (SingerId, VenueId, EventDate),
			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 Performances table in database [%s]\n", db)
	return nil
}

Java

Informationen zum Installieren und Verwenden der Clientbibliothek für Cloud Spanner finden Sie unter Cloud Spanner-Clientbibliotheken.

static void createTableWithTimestamp(DatabaseAdminClient dbAdminClient, DatabaseId id) {
  OperationFuture<Void, UpdateDatabaseDdlMetadata> op =
      dbAdminClient.updateDatabaseDdl(
          id.getInstanceId().getInstance(),
          id.getDatabase(),
          Arrays.asList(
              "CREATE TABLE Performances ("
                  + "  SingerId     INT64 NOT NULL,"
                  + "  VenueId      INT64 NOT NULL,"
                  + "  EventDate    Date,"
                  + "  Revenue      INT64, "
                  + "  LastUpdateTime TIMESTAMP NOT NULL OPTIONS (allow_commit_timestamp=true)"
                  + ") PRIMARY KEY (SingerId, VenueId, EventDate),"
                  + "  INTERLEAVE IN PARENT Singers ON DELETE CASCADE"),
          null);
  try {
    // Initiate the request which returns an OperationFuture.
    op.get();
    System.out.println("Created Performances table in database: [" + id + "]");
  } 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

Informationen zum Installieren und Verwenden der Clientbibliothek für Cloud Spanner finden Sie unter Cloud Spanner-Clientbibliotheken.

// 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);

// Note: Cloud Spanner interprets Node.js numbers as FLOAT64s, so they
// must be converted to strings before being inserted as INT64s
const request = [
  `CREATE TABLE Performances (
      SingerId    INT64 NOT NULL,
      VenueId     INT64 NOT NULL,
      EventDate   DATE,
      Revenue     INT64,
      LastUpdateTime TIMESTAMP NOT NULL OPTIONS (allow_commit_timestamp=true)
    ) PRIMARY KEY (SingerId, VenueId, EventDate),
    INTERLEAVE IN PARENT Singers ON DELETE CASCADE`,
];

// Creates a table in an existing database
const [operation] = await database.updateSchema(request);

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

await operation.promise();

console.log(`Created table Performances in database ${databaseId}.`);

PHP

Informationen zum Installieren und Verwenden der Clientbibliothek für Cloud Spanner finden Sie unter Cloud Spanner-Clientbibliotheken.

use Google\Cloud\Spanner\SpannerClient;

/**
 * Creates a table with a commit timestamp column.
 * Example:
 * ```
 * create_table_with_timestamp_column($instanceId, $databaseId);
 * ```
 *
 * @param string $instanceId The Spanner instance ID.
 * @param string $databaseId The Spanner database ID.
 */
function create_table_with_timestamp_column($instanceId, $databaseId)
{
    $spanner = new SpannerClient();
    $instance = $spanner->instance($instanceId);
    $database = $instance->database($databaseId);

    $operation = $database->updateDdl(
        'CREATE TABLE Performances (
    		SingerId	INT64 NOT NULL,
    		VenueId		INT64 NOT NULL,
    		EventDate	DATE,
    		Revenue		INT64,
    		LastUpdateTime	TIMESTAMP NOT NULL OPTIONS (allow_commit_timestamp=true)
    	) PRIMARY KEY (SingerId, VenueId, EventDate),
    	INTERLEAVE IN PARENT Singers on DELETE CASCADE'
    );

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

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

Python

Informationen zum Installieren und Verwenden der Clientbibliothek für Cloud Spanner finden Sie unter Cloud Spanner-Clientbibliotheken.

def create_table_with_timestamp(instance_id, database_id):
    """Creates a table with a COMMIT_TIMESTAMP column."""

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

    operation = database.update_ddl(
        [
            """CREATE TABLE Performances (
            SingerId     INT64 NOT NULL,
            VenueId      INT64 NOT NULL,
            EventDate    Date,
            Revenue      INT64,
            LastUpdateTime TIMESTAMP NOT NULL
            OPTIONS(allow_commit_timestamp=true)
        ) PRIMARY KEY (SingerId, VenueId, EventDate),
          INTERLEAVE IN PARENT Singers ON DELETE CASCADE"""
        ]
    )

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

    print(
        "Created Performances table on database {} on instance {}".format(
            database_id, instance_id
        )
    )

Ruby

Informationen zum Installieren und Verwenden der Clientbibliothek für Cloud Spanner finden Sie unter Cloud Spanner-Clientbibliotheken.

# 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: [
                                                  "CREATE TABLE Performances (
    SingerId     INT64 NOT NULL,
    VenueId      INT64 NOT NULL,
    EventDate    Date,
    Revenue      INT64,
    LastUpdateTime TIMESTAMP NOT NULL OPTIONS (allow_commit_timestamp=true)
   ) PRIMARY KEY (SingerId, VenueId, EventDate),
   INTERLEAVE IN PARENT Singers ON DELETE CASCADE"
                                                ]

puts "Waiting for update database operation to complete"

job.wait_until_done!

puts "Created table Performances in #{database_id}"

Nächste Schritte

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