Datastore mode client libraries

This page shows how to get started with the Cloud Client Libraries for the Datastore API. Client libraries make it easier to access Google Cloud APIs from a supported language. Although you can use Google Cloud APIs directly by making raw requests to the server, client libraries provide simplifications that significantly reduce the amount of code you need to write.

Read more about the Cloud Client Libraries and the older Google API Client Libraries in Client libraries explained.

Install the client library

C#

Install-Package Google.Cloud.Datastore.V1

For more information, see Setting Up a C# Development Environment.

Go

go get cloud.google.com/go/datastore

For more information, see Setting Up a Go Development Environment.

Java

If you are using Maven, add the following to your pom.xml file. For more information about BOMs, see The Google Cloud Platform Libraries BOM.

<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.google.cloud</groupId>
<artifactId>libraries-bom</artifactId>
<version>26.62.0</version>
<type>pom</type>
<scope>import</scope>
</dependency>
 </dependencies>
</dependencyManagement>
<dependencies>
 <dependency>
 <groupId>com.google.cloud</groupId>
<artifactId>google-cloud-datastore</artifactId>
</dependency>

If you are using Gradle, add the following to your dependencies:

implementationplatform('com.google.cloud:libraries-bom:26.70.0')
implementation'com.google.cloud:google-cloud-datastore'

If you are using sbt, add the following to your dependencies:

libraryDependencies+="com.google.cloud"%"google-cloud-datastore"%"2.32.3"

If you're using Visual Studio Code, IntelliJ, or Eclipse, you can add client libraries to your project using the following IDE plugins:

The plugins provide additional functionality, such as key management for service accounts. Refer to each plugin's documentation for details.

For more information, see Setting Up a Java Development Environment.

Node.js

npm install @google-cloud/datastore

For more information, see Setting Up a Node.js Development Environment.

PHP

composer require google/cloud-datastore

For more information, see Using PHP on Google Cloud.

Python

pip install --upgrade google-cloud-datastore

For more information, see Setting Up a Python Development Environment.

Ruby

gem install google-cloud-datastore

For more information, see Setting Up a Ruby Development Environment.

Set up authentication

To authenticate calls to Google Cloud APIs, client libraries support Application Default Credentials (ADC); the libraries look for credentials in a set of defined locations and use those credentials to authenticate requests to the API. With ADC, you can make credentials available to your application in a variety of environments, such as local development or production, without needing to modify your application code.

For production environments, the way you set up ADC depends on the service and context. For more information, see Set up Application Default Credentials.

For a local development environment, you can set up ADC with the credentials that are associated with your Google Account:

  1. Install the Google Cloud CLI. After installation, initialize the Google Cloud CLI by running the following command: 

    gcloudinit

    If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity.

  2. If you're using a local shell, then create local authentication credentials for your user account: 

    gcloudauthapplication-defaultlogin

    You don't need to do this if you're using Cloud Shell.

    If an authentication error is returned, and you are using an external identity provider (IdP), confirm that you have signed in to the gcloud CLI with your federated identity.

    A sign-in screen appears. After you sign in, your credentials are stored in the local credential file used by ADC.

Use the client library

The following example shows how to use the client library.

C#

usingGoogle.Cloud.Datastore.V1 ;
namespaceGoogleCloudSamples
{
publicclassQuickStart
{
publicstaticvoidMain(string[]args)
{
// Your Google Cloud Platform project ID
stringprojectId="YOUR-PROJECT-ID";
// Instantiates a client
DatastoreDb db=DatastoreDb .Create (projectId);
// The kind for the new entity
stringkind="Task";
// The name/ID for the new entity
stringname="sampletask1";
KeyFactory keyFactory=db.CreateKeyFactory (kind);
// The Cloud Datastore key for the new entity
Key key=keyFactory.CreateKey (name);
vartask=newEntity
{
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


// Sample datastore-quickstart fetches an entity from Google Cloud Datastore.
packagemain
import(
"context"
"fmt"
"log"
"cloud.google.com/go/datastore"
)
typeTaskstruct{
Descriptionstring
}
funcmain(){
ctx:=context.Background()
// Set your Google Cloud Platform project ID.
projectID:="YOUR_PROJECT_ID"
// Creates a client.
client,err:=datastore.NewClient (ctx,projectID)
iferr!=nil{
log.Fatalf("Failed to create client: %v",err)
}
deferclient.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

// Imports the Google Cloud client library
importcom.google.cloud.datastore.Datastore ;
importcom.google.cloud.datastore.DatastoreOptions ;
importcom.google.cloud.datastore.Entity ;
importcom.google.cloud.datastore.Key ;
publicclass QuickstartSample{
publicstaticvoidmain(String...args)throwsException{
// Instantiates a client
Datastore datastore=DatastoreOptions .getDefaultInstance ().getService();
// The kind for the new entity
Stringkind="Task";
// The name/ID for the new entity
Stringname="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

// Imports the Google Cloud client library
const{Datastore}=require('@google-cloud/datastore');
// Creates a client
constdatastore=newDatastore ();
asyncfunctionquickstart(){
// The kind for the new entity
constkind='Task';
// The name/ID for the new entity
constname='sampletask1';
// The Cloud Datastore key for the new entity
consttaskKey=datastore.key ([kind,name]);
// Prepares the new entity
consttask={
key:taskKey,
data:{
description:'Buy milk',
},
};
// Saves the entity
awaitdatastore.save(task);
console.log(`Saved ${task.key .name}: ${task.data.description}`);
}
quickstart();

PHP

# 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

# Imports the Google Cloud client library
fromgoogle.cloudimport 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

# 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.keykind,task_name
# Prepares the new entity
task=datastore.entitytask_keydo|t|
t["description"]="Buy milk"
end
# Saves the entity
datastore.savetask
puts"Saved #{task.key.name}: #{task['description']}"
task_key=datastore.findtask_key

Additional resources

C#

The following list contains links to more resources related to the client library for C#:

Go

The following list contains links to more resources related to the client library for Go:

Java

The following list contains links to more resources related to the client library for Java:

Node.js

The following list contains links to more resources related to the client library for Node.js:

PHP

The following list contains links to more resources related to the client library for PHP:

Python

The following list contains links to more resources related to the client library for Python:

Ruby

The following list contains links to more resources related to the client library for Ruby:

Dependency on App Engine application

See App Engine Requirement.

Google App Engine Standard Environment Client Libraries

Integrate Firestore in Datastore mode with your App Engine Standard Environment applications by using the App Engine client libraries.

Language Library
Go Google App Engine SDK for Go
Java Google App Engine SDK for Java
Python 3 Google Cloud Datastore client library or the Google Cloud NDB Client Library.
Python 2 Google Cloud NDB Client Library

Third-party Datastore API client libraries

In addition to the Google-supported client libraries listed in the tables above, a set of third-party libraries are available.

Language Library
Java Objectify
PHP Datastore Library for PHP

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Last updated 2025年10月30日 UTC.