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如需查看包含此代码示例的详细文档,请参阅以下内容:

代码示例

C#

如需了解如何安装和使用 Datastore 模式客户端库,请参阅 Datastore 模式客户端库。如需了解详情,请参阅 Datastore 模式 C# API 参考文档

如需向 Datastore 模式进行身份验证,请设置应用默认凭据。如需了解详情,请参阅为本地开发环境设置身份验证

using Google.Cloud.Datastore.V1;

namespace GoogleCloudSamples
{
    public class QuickStart
    {
        public static void Main(string[] args)
        {
            // Your Google Cloud Platform project ID
            string projectId = "YOUR-PROJECT-ID";

            // Instantiates a client
            DatastoreDb db = DatastoreDb.Create(projectId);

            // The kind for the new entity
            string kind = "Task";
            // The name/ID for the new entity
            string name = "sampletask1";
            KeyFactory keyFactory = db.CreateKeyFactory(kind);
            // The Cloud Datastore key for the new entity
            Key key = keyFactory.CreateKey(name);

            var task = new Entity
            {
                Key = key,
                ["description"] = "Buy milk"
            };
            using (DatastoreTransaction transaction = db.BeginTransaction())
            {
                // Saves the task
                transaction.Upsert(task);
                transaction.Commit();

                Console.WriteLine($"Saved {task.Key.Path[0].Name}: {(string)task["description"]}");
            }
        }
    }
}

Go

如需了解如何安装和使用 Datastore 模式客户端库,请参阅 Datastore 模式客户端库。如需了解详情,请参阅 Datastore 模式 Go API 参考文档

如需向 Datastore 模式进行身份验证,请设置应用默认凭据。如需了解详情,请参阅为本地开发环境设置身份验证


// Sample datastore-quickstart fetches an entity from Google Cloud Datastore.
package main

import (
	"context"
	"fmt"
	"log"

	"cloud.google.com/go/datastore"
)

type Task struct {
	Description string
}

func main() {
	ctx := context.Background()

	// Set your Google Cloud Platform project ID.
	projectID := "YOUR_PROJECT_ID"

	// Creates a client.
	client, err := datastore.NewClient(ctx, projectID)
	if err != nil {
		log.Fatalf("Failed to create client: %v", err)
	}
	defer client.Close()

	// Sets the kind for the new entity.
	kind := "Task"
	// Sets the name/ID for the new entity.
	name := "sampletask1"
	// Creates a Key instance.
	taskKey := datastore.NameKey(kind, name, nil)

	// Creates a Task instance.
	task := Task{
		Description: "Buy milk",
	}

	// Saves the new entity.
	if _, err := client.Put(ctx, taskKey, &task); err != nil {
		log.Fatalf("Failed to save task: %v", err)
	}

	fmt.Printf("Saved %v: %v\n", taskKey, task.Description)
}

Java

如需了解如何安装和使用 Datastore 模式客户端库,请参阅 Datastore 模式客户端库。如需了解详情,请参阅 Datastore 模式 Java API 参考文档

如需向 Datastore 模式进行身份验证,请设置应用默认凭据。如需了解详情,请参阅为本地开发环境设置身份验证

// Imports the Google Cloud client library
import com.google.cloud.datastore.Datastore;
import com.google.cloud.datastore.DatastoreOptions;
import com.google.cloud.datastore.Entity;
import com.google.cloud.datastore.Key;

public class QuickstartSample {
  public static void main(String... args) throws Exception {
    // Instantiates a client
    Datastore datastore = DatastoreOptions.getDefaultInstance().getService();

    // The kind for the new entity
    String kind = "Task";
    // The name/ID for the new entity
    String name = "sampletask1";
    // The Cloud Datastore key for the new entity
    Key taskKey = datastore.newKeyFactory().setKind(kind).newKey(name);

    // Prepares the new entity
    Entity task = Entity.newBuilder(taskKey).set("description", "Buy milk").build();

    // Saves the entity
    datastore.put(task);

    System.out.printf("Saved %s: %s%n", task.getKey().getName(), task.getString("description"));

    // Retrieve entity
    Entity retrieved = datastore.get(taskKey);

    System.out.printf("Retrieved %s: %s%n", taskKey.getName(), retrieved.getString("description"));
  }
}

Node.js

如需了解如何安装和使用 Datastore 模式客户端库,请参阅 Datastore 模式客户端库。如需了解详情,请参阅 Datastore 模式 Node.js API 参考文档

如需向 Datastore 模式进行身份验证,请设置应用默认凭据。如需了解详情,请参阅为本地开发环境设置身份验证

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

// Creates a client
const datastore = new Datastore();

async function quickstart() {
  // The kind for the new entity
  const kind = 'Task';

  // The name/ID for the new entity
  const name = 'sampletask1';

  // The Cloud Datastore key for the new entity
  const taskKey = datastore.key([kind, name]);

  // Prepares the new entity
  const task = {
    key: taskKey,
    data: {
      description: 'Buy milk',
    },
  };

  // Saves the entity
  await datastore.save(task);
  console.log(`Saved ${task.key.name}: ${task.data.description}`);
}
quickstart();

PHP

如需了解如何安装和使用 Datastore 模式客户端库,请参阅 Datastore 模式客户端库。如需了解详情,请参阅 Datastore 模式 PHP API 参考文档

如需向 Datastore 模式进行身份验证,请设置应用默认凭据。如需了解详情,请参阅为本地开发环境设置身份验证

# Includes the autoloader for libraries installed with composer
require __DIR__ . '/vendor/autoload.php';

# Imports the Google Cloud client library
use Google\Cloud\Datastore\DatastoreClient;

# Your Google Cloud Platform project ID
$projectId = 'YOUR_PROJECT_ID';

# Instantiates a client
$datastore = new DatastoreClient([
    'projectId' => $projectId
]);

# The kind for the new entity
$kind = 'Task';

# The name/ID for the new entity
$name = 'sampletask1';

# The Cloud Datastore key for the new entity
$taskKey = $datastore->key($kind, $name);

# Prepares the new entity
$task = $datastore->entity($taskKey, ['description' => 'Buy milk']);

# Saves the entity
$datastore->upsert($task);

echo 'Saved ' . $task->key() . ': ' . $task['description'] . PHP_EOL;

Python

如需了解如何安装和使用 Datastore 模式客户端库,请参阅 Datastore 模式客户端库。如需了解详情,请参阅 Datastore 模式 Python API 参考文档

如需向 Datastore 模式进行身份验证,请设置应用默认凭据。如需了解详情,请参阅为本地开发环境设置身份验证

# Imports the Google Cloud client library
from google.cloud import datastore

# Instantiates a client
datastore_client = datastore.Client()

# The kind for the new entity
kind = "Task"
# The name/ID for the new entity
name = "sampletask1"
# The Cloud Datastore key for the new entity
task_key = datastore_client.key(kind, name)

# Prepares the new entity
task = datastore.Entity(key=task_key)
task["description"] = "Buy milk"

# Saves the entity
datastore_client.put(task)

print(f"Saved {task.key.name}: {task['description']}")

Ruby

如需了解如何安装和使用 Datastore 模式客户端库,请参阅 Datastore 模式客户端库。如需了解详情,请参阅 Datastore 模式 Ruby API 参考文档

如需向 Datastore 模式进行身份验证,请设置应用默认凭据。如需了解详情,请参阅为本地开发环境设置身份验证

# Imports the Google Cloud client library
require "google/cloud/datastore"

# Instantiate a client
datastore = Google::Cloud::Datastore.new

# The kind for the new entity
kind = "Task"
# The name/ID for the new entity
# task_name = "sampleTask"
# The Cloud Datastore key for the new entity
task_key = datastore.key kind, task_name

# Prepares the new entity
task = datastore.entity task_key do |t|
  t["description"] = "Buy milk"
end

# Saves the entity
datastore.save task

puts "Saved #{task.key.name}: #{task['description']}"
task_key = datastore.find task_key

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例,请参阅 Google Cloud 示例浏览器