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Salvo quando diversamente specificato, i contenuti di questa pagina sono concessi in base alla licenza Creative Commons Attribution 4.0, mentre gli esempi di codice sono concessi in base alla licenza Apache 2.0. Per ulteriori dettagli, consulta le norme del sito di Google Developers. Java è un marchio registrato di Oracle e/o delle sue consociate.
[[["Facile da capire","easyToUnderstand","thumb-up"],["Il problema è stato risolto","solvedMyProblem","thumb-up"],["Altra","otherUp","thumb-up"]],[["Difficile da capire","hardToUnderstand","thumb-down"],["Informazioni o codice di esempio errati","incorrectInformationOrSampleCode","thumb-down"],["Mancano le informazioni o gli esempi di cui ho bisogno","missingTheInformationSamplesINeed","thumb-down"],["Problema di traduzione","translationIssue","thumb-down"],["Altra","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis content provides code samples and instructions for updating an existing label on a BigQuery dataset.\u003c/p\u003e\n"],["\u003cp\u003eCode examples are provided in Go, Java, Node.js, and Python, illustrating how to add a "color: green" label to a dataset.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation references links for setting up authentication and client libraries to use BigQuery.\u003c/p\u003e\n"],["\u003cp\u003eEach code sample guides the user to the quickstart and API reference documentation for their specific language.\u003c/p\u003e\n"],["\u003cp\u003eThe code samples use language-specific client libraries to interact with the BigQuery API for dataset label manipulation.\u003c/p\u003e\n"]]],[],null,["# Update a label\n\nUpdate an existing label on a dataset.\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Adding labels to resources](/bigquery/docs/adding-labels)\n- [Updating labels](/bigquery/docs/updating-labels)\n\nCode sample\n-----------\n\n### Go\n\n\nBefore trying this sample, follow the Go setup instructions in the\n[BigQuery quickstart using\nclient libraries](/bigquery/docs/quickstarts/quickstart-client-libraries).\n\n\nFor more information, see the\n[BigQuery Go API\nreference documentation](https://godoc.org/cloud.google.com/go/bigquery).\n\n\nTo authenticate to BigQuery, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for client libraries](/bigquery/docs/authentication#client-libs).\n\n import (\n \t\"context\"\n \t\"fmt\"\n\n \t\"cloud.google.com/go/bigquery\"\n )\n\n // addDatasetLabel demonstrates adding label metadata to an existing dataset.\n func addDatasetLabel(projectID, datasetID string) error {\n \t// projectID := \"my-project-id\"\n \t// datasetID := \"mydataset\"\n \tctx := context.Background()\n \tclient, err := bigquery.NewClient(ctx, projectID)\n \tif err != nil {\n \t\treturn fmt.Errorf(\"bigquery.NewClient: %w\", err)\n \t}\n \tdefer client.Close()\n\n \tds := client.Dataset(datasetID)\n \tmeta, err := ds.Metadata(ctx)\n \tif err != nil {\n \t\treturn err\n \t}\n\n \tupdate := bigquery.https://cloud.google.com/go/docs/reference/cloud.google.com/go/bigquery/latest/index.html#cloud_google_com_go_bigquery_DatasetMetadataToUpdate{}\n \tupdate.SetLabel(\"color\", \"green\")\n \tif _, err := ds.Update(ctx, update, meta.ETag); err != nil {\n \t\treturn err\n \t}\n \treturn nil\n }\n\n### Java\n\n\nBefore trying this sample, follow the Java setup instructions in the\n[BigQuery quickstart using\nclient libraries](/bigquery/docs/quickstarts/quickstart-client-libraries).\n\n\nFor more information, see the\n[BigQuery Java API\nreference documentation](/java/docs/reference/google-cloud-bigquery/latest/overview).\n\n\nTo authenticate to BigQuery, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for client libraries](/bigquery/docs/authentication#client-libs).\n\n import com.google.cloud.bigquery.https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.BigQuery.html;\n import com.google.cloud.bigquery.https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.BigQueryException.html;\n import com.google.cloud.bigquery.https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.BigQueryOptions.html;\n import com.google.cloud.bigquery.https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.Dataset.html;\n import java.util.HashMap;\n import java.util.Map;\n\n // Sample to updates a label on dataset\n public class LabelDataset {\n\n public static void main(String[] args) {\n // TODO(developer): Replace these variables before running the sample.\n String datasetName = \"MY_DATASET_NAME\";\n labelDataset(datasetName);\n }\n\n public static void labelDataset(String datasetName) {\n try {\n // Initialize client that will be used to send requests. This client only needs to be created\n // once, and can be reused for multiple requests.\n https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.BigQuery.html bigquery = https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.BigQueryOptions.html.getDefaultInstance().getService();\n\n // This example dataset starts with existing label { color: 'green' }\n https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.Dataset.html dataset = bigquery.https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.BigQuery.html#com_google_cloud_bigquery_BigQuery_getDataset_com_google_cloud_bigquery_DatasetId_com_google_cloud_bigquery_BigQuery_DatasetOption____(datasetName);\n // Add label to dataset\n Map\u003cString, String\u003e labels = new HashMap\u003c\u003e();\n labels.put(\"color\", \"green\");\n\n dataset.https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.Dataset.html#com_google_cloud_bigquery_Dataset_toBuilder__().setLabels(labels).build().update();\n System.out.println(\"Label added successfully\");\n } catch (https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.BigQueryException.html e) {\n System.out.println(\"Label was not added. \\n\" + e.toString());\n }\n }\n }\n\n### Node.js\n\n\nBefore trying this sample, follow the Node.js setup instructions in the\n[BigQuery quickstart using\nclient libraries](/bigquery/docs/quickstarts/quickstart-client-libraries).\n\n\nFor more information, see the\n[BigQuery Node.js API\nreference documentation](https://googleapis.dev/nodejs/bigquery/latest/index.html).\n\n\nTo authenticate to BigQuery, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for client libraries](/bigquery/docs/authentication#client-libs).\n\n // Import the Google Cloud client library\n const {BigQuery} = require('https://cloud.google.com/nodejs/docs/reference/bigquery/latest/overview.html');\n const bigquery = new https://cloud.google.com/nodejs/docs/reference/bigquery/latest/bigquery/bigquery.html();\n\n async function labelDataset() {\n // Updates a label on a dataset.\n\n /**\n * TODO(developer): Uncomment the following lines before running the sample\n */\n // const datasetId = \"my_dataset\";\n\n // Retrieve current dataset metadata.\n const dataset = bigquery.dataset(datasetId);\n const [metadata] = await dataset.getMetadata();\n\n // Add label to dataset metadata\n metadata.labels = {color: 'green'};\n const [apiResponse] = await dataset.setMetadata(metadata);\n\n console.log(`${datasetId} labels:`);\n console.log(apiResponse.labels);\n }\n\n### Python\n\n\nBefore trying this sample, follow the Python setup instructions in the\n[BigQuery quickstart using\nclient libraries](/bigquery/docs/quickstarts/quickstart-client-libraries).\n\n\nFor more information, see the\n[BigQuery Python API\nreference documentation](/python/docs/reference/bigquery/latest).\n\n\nTo authenticate to BigQuery, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for client libraries](/bigquery/docs/authentication#client-libs).\n\n\n from google.cloud import https://cloud.google.com/python/docs/reference/bigquery/latest/\n\n # Construct a BigQuery client object.\n client = https://cloud.google.com/python/docs/reference/bigquery/latest/.https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.client.Client.html()\n\n # TODO(developer): Set dataset_id to the ID of the dataset to fetch.\n # dataset_id = \"your-project.your_dataset\"\n\n dataset = client.https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.client.Client.html#google_cloud_bigquery_client_Client_get_dataset(dataset_id) # Make an API request.\n dataset.labels = {\"color\": \"green\"}\n dataset = client.https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.client.Client.html#google_cloud_bigquery_client_Client_update_dataset(dataset, [\"labels\"]) # Make an API request.\n\n print(\"Labels added to {}\".format(dataset_id))\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=bigquery)."]]