Update
Restez organisé à l'aide des collections
Enregistrez et classez les contenus selon vos préférences.
Met à jour une entité.
En savoir plus
Pour obtenir une documentation détaillée incluant cet exemple de code, consultez les articles suivants :
Exemple de code
Sauf indication contraire, le contenu de cette page est régi par une licence Creative Commons Attribution 4.0, et les échantillons de code sont régis par une licence Apache 2.0. Pour en savoir plus, consultez les Règles du site Google Developers. Java est une marque déposée d'Oracle et/ou de ses sociétés affiliées.
[[["Facile à comprendre","easyToUnderstand","thumb-up"],["J'ai pu résoudre mon problème","solvedMyProblem","thumb-up"],["Autre","otherUp","thumb-up"]],[["Difficile à comprendre","hardToUnderstand","thumb-down"],["Informations ou exemple de code incorrects","incorrectInformationOrSampleCode","thumb-down"],["Il n'y a pas l'information/les exemples dont j'ai besoin","missingTheInformationSamplesINeed","thumb-down"],["Problème de traduction","translationIssue","thumb-down"],["Autre","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis page provides code samples and information on how to update an entity in Datastore mode.\u003c/p\u003e\n"],["\u003cp\u003eThe content includes examples in C#, Go, Java, Node.js, PHP, Python, and Ruby, showcasing various approaches to updating an entity.\u003c/p\u003e\n"],["\u003cp\u003eEach language section offers links to the respective Datastore mode client libraries, API reference documentation, and authentication setup instructions.\u003c/p\u003e\n"],["\u003cp\u003eUpdating an entity involves retrieving the entity, modifying its properties, and then persisting the updated entity back to Datastore.\u003c/p\u003e\n"],["\u003cp\u003eTransactions are used to ensure data consistency when making changes to entities in Datastore, as illustrated in the code samples for multiple programming languages.\u003c/p\u003e\n"]]],[],null,["# Update an entity.\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Entities, Properties, and Keys](/datastore/docs/concepts/entities)\n\nCode sample\n-----------\n\n### C#\n\n\nTo learn how to install and use the client library for Datastore mode, see\n[Datastore mode client libraries](/datastore/docs/reference/libraries).\n\n\nFor more information, see the\n[Datastore mode C# API\nreference documentation](https://cloud.google.com/dotnet/docs/reference/Google.Cloud.Datastore.V1/latest).\n\n\nTo authenticate to Datastore mode, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n _sampleTask[\"priority\"] = 5;\n _db.Update(_sampleTask);\n\n### Go\n\n\nTo learn how to install and use the client library for Datastore mode, see\n[Datastore mode client libraries](/datastore/docs/reference/libraries).\n\n\nFor more information, see the\n[Datastore mode Go API\nreference documentation](https://cloud.google.com/go/docs/reference/cloud.google.com/go/datastore/latest).\n\n\nTo authenticate to Datastore mode, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n taskKey := datastore.NameKey(\"Task\", \"sampleTask\", nil)\n tx, err := client.NewTransaction(ctx)\n if err != nil {\n \tlog.Fatalf(\"client.NewTransaction: %v\", err)\n }\n var task Task\n if err := tx.Get(taskKey, &task); err != nil {\n \tlog.Fatalf(\"tx.Get: %v\", err)\n }\n task.Priority = 5\n if _, err := tx.Put(taskKey, &task); err != nil {\n \tlog.Fatalf(\"tx.Put: %v\", err)\n }\n if _, err := tx.Commit(); err != nil {\n \tlog.Fatalf(\"tx.Commit: %v\", err)\n }\n\n### Java\n\n\nTo learn how to install and use the client library for Datastore mode, see\n[Datastore mode client libraries](/datastore/docs/reference/libraries).\n\n\nFor more information, see the\n[Datastore mode Java API\nreference documentation](https://cloud.google.com/java/docs/reference/google-cloud-datastore/latest/history).\n\n\nTo authenticate to Datastore mode, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n Entity task;\n Transaction txn = datastore.newTransaction();\n try {\n task = Entity.newBuilder(txn.get(taskKey)).set(\"priority\", 5).build();\n txn.put(task);\n txn.commit();\n } finally {\n if (txn.isActive()) {\n txn.rollback();\n }\n }\n\n### Node.js\n\n\nTo learn how to install and use the client library for Datastore mode, see\n[Datastore mode client libraries](/datastore/docs/reference/libraries).\n\n\nFor more information, see the\n[Datastore mode Node.js API\nreference documentation](https://cloud.google.com/nodejs/docs/reference/datastore/latest).\n\n\nTo authenticate to Datastore mode, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n const taskKey = datastore.key('Task');\n const task = {\n category: 'Personal',\n done: false,\n priority: 4,\n description: 'Learn Cloud Datastore',\n };\n\n const entity = {\n key: taskKey,\n data: task,\n };\n\n await datastore.update(entity);\n // Task updated successfully.\n\n### PHP\n\n\nTo learn how to install and use the client library for Datastore mode, see\n[Datastore mode client libraries](/datastore/docs/reference/libraries).\n\n\nFor more information, see the\n[Datastore mode PHP API\nreference documentation](https://googleapis.github.io/google-cloud-php/#/docs/cloud-datastore/latest).\n\n\nTo authenticate to Datastore mode, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n $transaction = $datastore-\u003etransaction();\n $key = $datastore-\u003ekey('Task', 'sampleTask');\n $task = $transaction-\u003elookup($key);\n $task['priority'] = 5;\n $transaction-\u003eupdate($task);\n $transaction-\u003ecommit();\n\n### Python\n\n\nTo learn how to install and use the client library for Datastore mode, see\n[Datastore mode client libraries](/datastore/docs/reference/libraries).\n\n\nFor more information, see the\n[Datastore mode Python API\nreference documentation](https://cloud.google.com/python/docs/reference/datastore/latest).\n\n\nTo authenticate to Datastore mode, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n from google.cloud import https://cloud.google.com/python/docs/reference/datastore/latest/\n\n # For help authenticating your client, visit\n # https://cloud.google.com/docs/authentication/getting-started\n client = https://cloud.google.com/python/docs/reference/datastore/latest/.https://cloud.google.com/python/docs/reference/datastore/latest/google.cloud.datastore.client.Client.html()\n\n with client.https://cloud.google.com/python/docs/reference/datastore/latest/google.cloud.datastore.client.Client.html#google_cloud_datastore_client_Client_transaction():\n key = client.https://cloud.google.com/python/docs/reference/datastore/latest/google.cloud.datastore.client.Client.html#google_cloud_datastore_client_Client_key(\"Task\", \"sampleTask\")\n task = client.https://cloud.google.com/python/docs/reference/datastore/latest/google.cloud.datastore.client.Client.html#google_cloud_datastore_client_Client_get(key)\n\n task[\"done\"] = True\n\n client.https://cloud.google.com/python/docs/reference/datastore/latest/google.cloud.datastore.client.Client.html#google_cloud_datastore_client_Client_put(task)\n\n### Ruby\n\n\nTo learn how to install and use the client library for Datastore mode, see\n[Datastore mode client libraries](/datastore/docs/reference/libraries).\n\n\nFor more information, see the\n[Datastore mode Ruby API\nreference documentation](/ruby/docs/reference/google-cloud-datastore/latest).\n\n\nTo authenticate to Datastore mode, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n # task_name = \"sampleTask\"\n datastore.transaction do |_tx|\n task = datastore.find \"Task\", task_name\n task[\"priority\"] = 5\n datastore.save task\n end\n\nWhat's next\n-----------\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=datastore)."]]