Update

Update an entity.

Explore further

For detailed documentation that includes this code sample, see the following:

Entities, Properties, and Keys

Code sample

C#

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries . For more information, see the Datastore mode C# API reference documentation .

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment .

  _sampleTask 
 [ 
 "priority" 
 ] 
  
 = 
  
 5 
 ; 
 _db 
 . 
 Update 
 ( 
 _sampleTask 
 );

Go

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries . For more information, see the Datastore mode Go API reference documentation .

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment .

  taskKey 
  
 := 
  
 datastore 
 . 
 NameKey 
 ( 
 "Task" 
 , 
  
 "sampleTask" 
 , 
  
 nil 
 ) 
 tx 
 , 
  
 err 
  
 := 
  
 client 
 . 
 NewTransaction 
 ( 
 ctx 
 ) 
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 log 
 . 
 Fatalf 
 ( 
 "client.NewTransaction: %v" 
 , 
  
 err 
 ) 
 } 
 var 
  
 task 
  
 Task 
 if 
  
 err 
  
 := 
  
 tx 
 . 
 Get 
 ( 
 taskKey 
 , 
  
& task 
 ); 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 log 
 . 
 Fatalf 
 ( 
 "tx.Get: %v" 
 , 
  
 err 
 ) 
 } 
 task 
 . 
 Priority 
  
 = 
  
 5 
 if 
  
 _ 
 , 
  
 err 
  
 := 
  
 tx 
 . 
 Put 
 ( 
 taskKey 
 , 
  
& task 
 ); 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 log 
 . 
 Fatalf 
 ( 
 "tx.Put: %v" 
 , 
  
 err 
 ) 
 } 
 if 
  
 _ 
 , 
  
 err 
  
 := 
  
 tx 
 . 
 Commit 
 (); 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 log 
 . 
 Fatalf 
 ( 
 "tx.Commit: %v" 
 , 
  
 err 
 ) 
 }

Java

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries . For more information, see the Datastore mode Java API reference documentation .

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment .

  Entity 
  
 task 
 ; 
 Transaction 
  
 txn 
  
 = 
  
 datastore 
 . 
 newTransaction 
 (); 
 try 
  
 { 
  
 task 
  
 = 
  
 Entity 
 . 
 newBuilder 
 ( 
 txn 
 . 
 get 
 ( 
 taskKey 
 )). 
 set 
 ( 
 "priority" 
 , 
  
 5 
 ). 
 build 
 (); 
  
 txn 
 . 
 put 
 ( 
 task 
 ); 
  
 txn 
 . 
 commit 
 (); 
 } 
  
 finally 
  
 { 
  
 if 
  
 ( 
 txn 
 . 
 isActive 
 ()) 
  
 { 
  
 txn 
 . 
 rollback 
 (); 
  
 } 
 }

Node.js

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries . For more information, see the Datastore mode Node.js API reference documentation .

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment .

  const 
  
 taskKey 
  
 = 
  
 datastore 
 . 
 key 
 ( 
 'Task' 
 ); 
 const 
  
 task 
  
 = 
  
 { 
  
 category 
 : 
  
 'Personal' 
 , 
  
 done 
 : 
  
 false 
 , 
  
 priority 
 : 
  
 4 
 , 
  
 description 
 : 
  
 'Learn Cloud Datastore' 
 , 
 }; 
 const 
  
 entity 
  
 = 
  
 { 
  
 key 
 : 
  
 taskKey 
 , 
  
 data 
 : 
  
 task 
 , 
 }; 
 await 
  
 datastore 
 . 
 update 
 ( 
 entity 
 ); 
 // Task updated successfully.

PHP

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries . For more information, see the Datastore mode PHP API reference documentation .

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment .

  $transaction = $datastore->transaction(); 
 $key = $datastore->key('Task', 'sampleTask'); 
 $task = $transaction->lookup($key); 
 $task['priority'] = 5; 
 $transaction->update($task); 
 $transaction->commit();

Python

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries . For more information, see the Datastore mode Python API reference documentation .

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment .

  from 
  
 google.cloud 
  
 import 
  datastore 
 
 # For help authenticating your client, visit 
 # https://cloud.google.com/docs/authentication/getting-started 
 client 
 = 
  datastore 
 
 . 
  Client 
 
 () 
 with 
 client 
 . 
  transaction 
 
 (): 
 key 
 = 
 client 
 . 
  key 
 
 ( 
 "Task" 
 , 
 "sampleTask" 
 ) 
 task 
 = 
 client 
 . 
  get 
 
 ( 
 key 
 ) 
 task 
 [ 
 "done" 
 ] 
 = 
 True 
 client 
 . 
  put 
 
 ( 
 task 
 )

Ruby

To learn how to install and use the client library for Datastore mode, see Datastore mode client libraries . For more information, see the Datastore mode Ruby API reference documentation .

To authenticate to Datastore mode, set up Application Default Credentials. For more information, see Set up authentication for a local development environment .

  # task_name = "sampleTask" 
 datastore 
 . 
 transaction 
  
 do 
  
 | 
 _tx 
 | 
  
 task 
  
 = 
  
 datastore 
 . 
 find 
  
 "Task" 
 , 
  
 task_name 
  
 task 
 [ 
 "priority" 
 ] 
  
 = 
  
 5 
  
 datastore 
 . 
 save 
  
 task 
 end

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Code sample

C#

Go

Java

Node.js

PHP

Python

Ruby

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