Tables: Add label

Add a label to a table.

Documentation pages that include this code sample

Code Sample

Go

Before trying this sample, follow the Go setup instructions in the BigQuery Quickstart Using Client Libraries. For more information, see the BigQuery Go API reference documentation.

import (
	"context"
	"fmt"

	"cloud.google.com/go/bigquery"
)

// addTableLabel demonstrates adding Label metadata to a BigQuery table.
func addTableLabel(projectID, datasetID, tableID string) error {
	// projectID := "my-project-id"
	// datasetID := "mydataset"
	// tableID := "mytable"
	ctx := context.Background()
	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("bigquery.NewClient: %v", err)
	}
	defer client.Close()

	tbl := client.Dataset(datasetID).Table(tableID)
	meta, err := tbl.Metadata(ctx)
	if err != nil {
		return err
	}

	update := bigquery.TableMetadataToUpdate{}
	update.SetLabel("color", "green")
	if _, err := tbl.Update(ctx, update, meta.ETag); err != nil {
		return err
	}
	return nil
}

Node.js

Before trying this sample, follow the Node.js setup instructions in the BigQuery Quickstart Using Client Libraries. For more information, see the BigQuery Node.js API reference documentation.

// Import the Google Cloud client library
const {BigQuery} = require('@google-cloud/bigquery');
const bigquery = new BigQuery();

async function labelTable() {
  // Adds a label to an existing table.

  /**
   * TODO(developer): Uncomment the following lines before running the sample.
   */
  // const datasetId = 'my_dataset';
  // const tableId = 'my_table';

  const dataset = bigquery.dataset(datasetId);
  const [table] = await dataset.table(tableId).get();

  // Retrieve current table metadata
  const [metadata] = await table.getMetadata();

  // Add label to table metadata
  metadata.labels = {color: 'green'};
  const [apiResponse] = await table.setMetadata(metadata);

  console.log(`${tableId} labels:`);
  console.log(apiResponse.labels);
}

Python

Before trying this sample, follow the Python setup instructions in the BigQuery Quickstart Using Client Libraries. For more information, see the BigQuery Python API reference documentation.

# from google.cloud import bigquery
# client = bigquery.Client()
# project = client.project
# dataset_ref = bigquery.DatasetReference(project, dataset_id)
# table_ref = dataset_ref.table('my_table')
# table = client.get_table(table_ref)  # API request

assert table.labels == {}
labels = {"color": "green"}
table.labels = labels

table = client.update_table(table, ["labels"])  # API request

assert table.labels == labels