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:

  implementation 
  
 platform 
 ( 
 'com.google.cloud:libraries-bom:26.66.0' 
 ) 
 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" 
  
 % 
  
 "2.31.4"

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:

Install the Google Cloud CLI. After installation, initialize the Google Cloud CLI by running the following command:
```
gcloud  
init
```
If you're using an external identity provider (IdP), you must first sign in to the gcloud CLI with your federated identity .
If you're using a local shell, then create local authentication credentials for your user account:
```
gcloud  
auth  
application-default  
login
```
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#

  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

  // 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

  // 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

  // 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

  # 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 
 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

  # 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

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

Datastore mode client libraries Stay organized with collections Save and categorize content based on your preferences.

Install the client library

C#

Go

Java

Node.js

PHP

Python

Ruby

Set up authentication

Use the client library

C#

Go

Java

Node.js

PHP

Python

Ruby

Additional resources

C#

Go

Java

Node.js

PHP

Python

Ruby

Dependency on App Engine application

Google App Engine Standard Environment Client Libraries

Third-party Datastore API client libraries

Datastore mode client libraries