更新默认表到期时间

更新数据集的默认表到期时间。

包含此代码示例的文档页面

如需查看上下文中使用的代码示例，请参阅以下文档：

更新数据集属性

代码示例

Go

在尝试此示例之前，请按照《BigQuery 快速入门：使用客户端库》中的 Go 设置说明进行操作。如需了解详情，请参阅 BigQuery Go API 参考文档。

import (
	"context"
	"fmt"
	"time"

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

// updateDatasetDefaultExpiration demonstrats setting the default expiration of a dataset
// to a specific retention period.
func updateDatasetDefaultExpiration(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: %v", err)
	}
	defer client.Close()

	ds := client.Dataset(datasetID)
	meta, err := ds.Metadata(ctx)
	if err != nil {
		return err
	}
	update := bigquery.DatasetMetadataToUpdate{
		DefaultTableExpiration: 24 * time.Hour,
	}
	if _, err := client.Dataset(datasetID).Update(ctx, update, meta.ETag); err != nil {
		return err
	}
	return nil
}

Java

试用此示例之前，请按照《BigQuery 快速入门：使用客户端库》中的 Java 设置说明进行操作。如需了解详情，请参阅 BigQuery Java API 参考文档。

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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.concurrent.TimeUnit;

public class UpdateDatasetExpiration {

  public static void main(String[] args) {
    // TODO(developer): Replace these variables before running the sample.
    String datasetName = "MY_DATASET_NAME";
    // Update dataset expiration to one day
    Long newExpiration = TimeUnit.MILLISECONDS.convert(1, TimeUnit.DAYS);
    updateDatasetExpiration(datasetName, newExpiration);
  }

  public static void updateDatasetExpiration(String datasetName, Long newExpiration) {
    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();

      Dataset dataset = bigquery.getDataset(datasetName);
      bigquery.update(dataset.toBuilder().setDefaultTableLifetime(newExpiration).build());
      System.out.println("Dataset description updated successfully to " + newExpiration);
    } catch (BigQueryException e) {
      System.out.println("Dataset expiration was not updated \n" + e.toString());
    }
  }
}

Node.js

在尝试此示例之前，请按照《BigQuery 快速入门：使用客户端库》中的 Node.js 设置说明进行操作。如需了解详情，请参阅 BigQuery Node.js API 参考文档。

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

async function updateDatasetExpiration() {
  // Updates the lifetime of all tables in the dataset, in milliseconds.

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

  // Retreive current dataset metadata
  const dataset = bigquery.dataset(datasetId);
  const [metadata] = await dataset.getMetadata();

  // Set new dataset metadata
  const expirationTime = 24 * 60 * 60 * 1000;
  metadata.defaultTableExpirationMs = expirationTime.toString();

  const [apiResponse] = await dataset.setMetadata(metadata);
  const newExpirationTime = apiResponse.defaultTableExpirationMs;

  console.log(`${datasetId} expiration: ${newExpirationTime}`);
}

Python

在尝试此示例之前，请按照《BigQuery 快速入门：使用客户端库》中的 Python 设置说明进行操作。如需了解详情，请参阅 BigQuery Python API 参考文档。

在 GitHub 上查看反馈


from google.cloud import bigquery

# Construct a BigQuery client object.
client = bigquery.Client()

# TODO(developer): Set dataset_id to the ID of the dataset to fetch.
# dataset_id = 'your-project.your_dataset'

dataset = client.get_dataset(dataset_id)  # Make an API request.
dataset.default_table_expiration_ms = 24 * 60 * 60 * 1000  # In milliseconds.

dataset = client.update_dataset(
    dataset, ["default_table_expiration_ms"]
)  # Make an API request.

full_dataset_id = "{}.{}".format(dataset.project, dataset.dataset_id)
print(
    "Updated dataset {} with new expiration {}".format(
        full_dataset_id, dataset.default_table_expiration_ms
    )
)