Obtenir les libellés de la table
Restez organisé à l'aide des collections
Enregistrez et classez les contenus selon vos préférences.
Récupérer les libellés d'une table pour un ID de table donné
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 content provides code samples in Go, Java, Node.js, and Python to retrieve the labels associated with a specific table in BigQuery.\u003c/p\u003e\n"],["\u003cp\u003eThe code samples demonstrate how to fetch table metadata and extract label information for a given dataset and table ID.\u003c/p\u003e\n"],["\u003cp\u003eEach language example includes instructions on setting up authentication and accessing relevant BigQuery API documentation.\u003c/p\u003e\n"],["\u003cp\u003eThe content highlights how to handle cases where a table has no labels defined and display messages accordingly.\u003c/p\u003e\n"]]],[],null,["# Get table labels\n\nRetrieve the labels of a table for a given table ID.\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Viewing labels](/bigquery/docs/viewing-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 \t\"io\"\n\n \t\"cloud.google.com/go/bigquery\"\n )\n\n // tableLabels demonstrates fetching metadata from a table and printing the Label metadata to an io.Writer.\n func tableLabels(w io.Writer, projectID, datasetID, tableID string) error {\n \t// projectID := \"my-project-id\"\n \t// datasetID := \"mydataset\"\n \t// tableID := \"mytable\"\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 \tmeta, err := client.Dataset(datasetID).Table(tableID).Metadata(ctx)\n \tif err != nil {\n \t\treturn err\n \t}\n \tfmt.Fprintf(w, \"Table %s labels:\\n\", datasetID)\n \tif len(meta.Labels) == 0 {\n \t\tfmt.Fprintln(w, \"Table has no labels defined.\")\n \t\treturn nil\n \t}\n \tfor k, v := range meta.Labels {\n \t\tfmt.Fprintf(w, \"\\t%s:%s\\n\", k, v)\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-biglake/latest/com.google.cloud.bigquery.biglake.v1.Table.html;\n import com.google.cloud.bigquery.https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.TableId.html;\n\n // Sample to get table labels\n public class GetTableLabels {\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 String tableName = \"MY_TABLE_NAME\";\n getTableLabels(datasetName, tableName);\n }\n\n public static void getTableLabels(String datasetName, String tableName) {\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 table starts with existing label { color: 'green' }\n https://cloud.google.com/java/docs/reference/google-cloud-biglake/latest/com.google.cloud.bigquery.biglake.v1.Table.html table = bigquery.https://cloud.google.com/java/docs/reference/google-cloud-bigquery/latest/com.google.cloud.bigquery.BigQuery.html#com_google_cloud_bigquery_BigQuery_getTable_com_google_cloud_bigquery_TableId_com_google_cloud_bigquery_BigQuery_TableOption____(TableId.of(datasetName, tableName));\n table\n .getLabels()\n .forEach((key, value) -\u003e System.out.println(\"Retrieved labels 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 deleted. \\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 getTableLabels() {\n // Gets labels on a dataset.\n\n /**\n * TODO(developer): Uncomment the following lines before running the sample.\n */\n // const datasetId = \"my_dataset\";\n // const tableId = \"my_table\";\n\n // Retrieve current dataset metadata.\n const table = bigquery.dataset(datasetId).table(tableId);\n const [metadata] = await table.getMetadata();\n const labels = metadata.labels;\n\n console.log(`${tableId} Labels:`);\n for (const [key, value] of Object.entries(labels)) {\n console.log(`${key}: ${value}`);\n }\n }\n getTableLabels();\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 from google.cloud import https://cloud.google.com/python/docs/reference/bigquery/latest/\n\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(dev): Change table_id to the full name of the table you want to create.\n table_id = \"your-project.your_dataset.your_table_name\"\n\n table = client.https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.client.Client.html#google_cloud_bigquery_client_Client_get_table(table_id) # API Request\n\n # View table labels\n print(f\"Table ID: {table_id}.\")\n if table.labels:\n for label, value in table.labels.https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.table.Row.html#google_cloud_bigquery_table_Row_items():\n print(f\"\\t{label}: {https://cloud.google.com/python/docs/reference/bigquery/latest/google.cloud.bigquery.query.ConnectionProperty.html#google_cloud_bigquery_query_ConnectionProperty_value}\")\n else:\n print(\"\\tTable has no labels defined.\")\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)."]]