Delete a label from a dataset

Remove a label from a dataset.

Explore further

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

• Deleting labels

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.

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

import (
	"context"
	"fmt"

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

// deleteDatasetLabel demonstrates removing a specific label from a dataset's metadata.
func deleteDatasetLabel(projectID, datasetID string) error {
	// projectID := "my-project-id"
	// datasetID := "mydataset"
	ctx := context.Background()

	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("bigquery.NewClient: %w", err)
	}
	defer client.Close()

	ds := client.Dataset(datasetID)
	meta, err := ds.Metadata(ctx)
	if err != nil {
		return err
	}
	update := bigquery.DatasetMetadataToUpdate{}
	update.DeleteLabel("color")
	if _, err := ds.Update(ctx, update, meta.ETag); err != nil {
		return err
	}
	return nil
}

Java

Before trying this sample, follow the Java setup instructions in the BigQuery quickstart using client libraries. For more information, see the BigQuery Java API reference documentation.

To authenticate to BigQuery, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Dataset;
import java.util.HashMap;
import java.util.Map;

// Sample tp deletes a label on a dataset.
public class DeleteLabelDataset {

  public static void main(String[] args) {
    // TODO(developer): Replace these variables before running the sample.
    String datasetName = "MY_DATASET_NAME";
    deleteLabelDataset(datasetName);
  }

  public static void deleteLabelDataset(String datasetName) {
    try {
      // Initialize client that will be used to send requests. This client only needs to be created
      // once, and can be reused for multiple requests.
      BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();

      // This example dataset starts with existing label { color: 'green' }
      Dataset dataset = bigquery.getDataset(datasetName);
      // Add label to dataset
      Map<String, String> labels = new HashMap<>();
      labels.put("color", null);

      dataset.toBuilder().setLabels(labels).build().update();
      System.out.println("Dataset label deleted successfully");
    } catch (BigQueryException e) {
      System.out.println("Dataset label was not deleted. \n" + e.toString());
    }
  }
}

What's next

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