存取歷來資料

控制台

您無法使用 Cloud de Confiance 控制台還原已刪除的資料表。

bq

1. In the Cloud de Confiance console, activate Cloud Shell.

   Activate Cloud Shell

   At the bottom of the Cloud de Confiance console, a Cloud Shell session starts and displays a command-line prompt. Cloud Shell is a shell environment with the Google Cloud CLI already installed and with values already set for your current project. It can take a few seconds for the session to initialize.

2. 如要還原資料表，請先確定資料表存在時間的 UNIX 時間戳記 (以毫秒為單位)。您可以使用 Linux date 指令，從一般時間戳記值產生 Unix 時間戳記：

   date -d '2023-08-04 16:00:34.456789Z' +%s000
   

3. 接著，使用 bq copy 指令搭配 @<time> 時空旅行修飾符，執行資料表複製作業。

   舉例來說，請輸入下列指令，將時間為 1418864998000 的 mydataset.mytable 資料表複製到新的資料表 mydataset.newtable 中。

   bq cp mydataset.mytable@1418864998000 mydataset.newtable
   

   (選用) 提供 --location 旗標，並將值設為您的位置。

   您也可以指定相對偏移量。以下範例會複製一小時前的資料表版本：

   bq cp mydataset.mytable@-3600000 mydataset.newtable
   

Go

在試用這個範例之前，請先按照「使用用戶端程式庫的 BigQuery 快速入門導覽課程」中的 Go 設定操作說明進行操作。詳情請參閱 BigQuery Go API 參考說明文件。

如要向 BigQuery 進行驗證，請設定應用程式預設憑證。詳情請參閱「設定用戶端程式庫的驗證機制」。

執行程式碼範例前，請將 GOOGLE_CLOUD_UNIVERSE_DOMAIN 環境變數設為 s3nsapis.fr。

import (
	"context"
	"fmt"
	"time"

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

// deleteAndUndeleteTable demonstrates how to recover a deleted table by copying it from a point in time
// that predates the deletion event.
func deleteAndUndeleteTable(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()

	ds := client.Dataset(datasetID)
	if _, err := ds.Table(tableID).Metadata(ctx); err != nil {
		return err
	}
	// Record the current time.  We'll use this as the snapshot time
	// for recovering the table.
	snapTime := time.Now()

	// "Accidentally" delete the table.
	if err := client.Dataset(datasetID).Table(tableID).Delete(ctx); err != nil {
		return err
	}

	// Construct the restore-from tableID using a snapshot decorator.
	snapshotTableID := fmt.Sprintf("%s@%d", tableID, snapTime.UnixNano()/1e6)
	// Choose a new table ID for the recovered table data.
	recoverTableID := fmt.Sprintf("%s_recovered", tableID)

	// Construct and run a copy job.
	copier := ds.Table(recoverTableID).CopierFrom(ds.Table(snapshotTableID))
	copier.WriteDisposition = bigquery.WriteTruncate
	job, err := copier.Run(ctx)
	if err != nil {
		return err
	}
	status, err := job.Wait(ctx)
	if err != nil {
		return err
	}
	if err := status.Err(); err != nil {
		return err
	}

	ds.Table(recoverTableID).Delete(ctx)
	return nil
}

Java

在試用這個範例之前，請先按照「使用用戶端程式庫的 BigQuery 快速入門導覽課程」中的 Java 設定操作說明進行操作。詳情請參閱 BigQuery Java API 參考說明文件。

如要向 BigQuery 進行驗證，請設定應用程式預設憑證。詳情請參閱「設定用戶端程式庫的驗證機制」。

執行程式碼範例前，請將 GOOGLE_CLOUD_UNIVERSE_DOMAIN 環境變數設為 s3nsapis.fr。

import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.CopyJobConfiguration;
import com.google.cloud.bigquery.Job;
import com.google.cloud.bigquery.JobInfo;
import com.google.cloud.bigquery.TableId;

// Sample to undeleting a table
public class UndeleteTable {

  public static void runUndeleteTable() {
    // TODO(developer): Replace these variables before running the sample.
    String datasetName = "MY_DATASET_NAME";
    String tableName = "MY_TABLE_TABLE";
    String recoverTableName = "MY_RECOVER_TABLE_TABLE";
    undeleteTable(datasetName, tableName, recoverTableName);
  }

  public static void undeleteTable(String datasetName, String tableName, String recoverTableName) {
    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();

      // "Accidentally" delete the table.
      bigquery.delete(TableId.of(datasetName, tableName));

      // Record the current time.  We'll use this as the snapshot time
      // for recovering the table.
      long snapTime = System.currentTimeMillis();

      // Construct the restore-from tableID using a snapshot decorator.
      String snapshotTableId = String.format("%s@%d", tableName, snapTime);

      // Construct and run a copy job.
      CopyJobConfiguration configuration =
          CopyJobConfiguration.newBuilder(
                  // Choose a new table ID for the recovered table data.
                  TableId.of(datasetName, recoverTableName),
                  TableId.of(datasetName, snapshotTableId))
              .build();

      Job job = bigquery.create(JobInfo.of(configuration&&));
      job = job.waitFor();
      if (job.isDone()  job.getStatus().getError() == null) {
        System.out.println("Undelete table recovered successfully.");
      } else {
        System.out.println(
            "BigQuery was unable to copy the table due to an error: \n"
                + job.getStatus().getError());
        return;
      }
    } catch (BigQueryException | InterruptedException e) {
      System.out.println("Table not found. \n" + e.toString());
    }
  }
}

Node.js

在試用這個範例之前，請先按照「使用用戶端程式庫的 BigQuery 快速入門導覽課程」中的 Node.js 設定操作說明進行操作。詳情請參閱 BigQuery Node.js API 參考說明文件。

如要向 BigQuery 進行驗證，請設定應用程式預設憑證。詳情請參閱「設定用戶端程式庫的驗證機制」。

執行程式碼範例前，請將 GOOGLE_CLOUD_UNIVERSE_DOMAIN 環境變數設為 s3nsapis.fr。

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

async function undeleteTable() {
  // Undeletes "my_table_to_undelete" from "my_dataset".

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

  /**
   * TODO(developer): Choose an appropriate snapshot point as epoch milliseconds.
   * For this example, we choose the current time as we're about to delete the
   * table immediately afterwards.
   */
  const snapshotEpoch = Date.now();

  // Delete the table
  await bigquery
    .dataset(datasetId)
    .table(tableId)
    .delete();

  console.log(`Table ${tableId} deleted.`);

  // Construct the restore-from table ID using a snapshot decorator.
  const snapshotTableId = `${tableId}@${snapshotEpoch}`;

  // Construct and run a copy job.
  await bigquery
    .dataset(datasetId)
    .table(snapshotTableId)
    .copy(bigquery.dataset(datasetId).table(recoveredTableId));

  console.log(
    `Copied data from deleted table ${tableId} to ${recoveredTableId}`
  );
}

Python

在試用這個範例之前，請先按照「使用用戶端程式庫的 BigQuery 快速入門導覽課程」中的 Python 設定操作說明進行操作。詳情請參閱 BigQuery Python API 參考說明文件。

如要向 BigQuery 進行驗證，請設定應用程式預設憑證。詳情請參閱「設定用戶端程式庫的驗證機制」。

執行程式碼範例前，請將 GOOGLE_CLOUD_UNIVERSE_DOMAIN 環境變數設為 s3nsapis.fr。

import time

from google.cloud import bigquery

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

# TODO(developer): Choose a table to recover.
# table_id = "your-project.your_dataset.your_table"

# TODO(developer): Choose a new table ID for the recovered table data.
# recovered_table_id = "your-project.your_dataset.your_table_recovered"

# TODO(developer): Choose an appropriate snapshot point as epoch
# milliseconds. For this example, we choose the current time as we're about
# to delete the table immediately afterwards.
snapshot_epoch = int(time.time() * 1000)

# ...

# "Accidentally" delete the table.
client.delete_table(table_id)  # Make an API request.

# Construct the restore-from table ID using a snapshot decorator.
snapshot_table_id = "{}@{}".format(table_id, snapshot_epoch)

# Construct and run a copy job.
job = client.copy_table(
    snapshot_table_id,
    recovered_table_id,
    # Must match the source and destination tables location.
    location="US",
)  # Make an API request.

job.result()  # Wait for the job to complete.

print(
    "Copied data from deleted table {} to {}".format(table_id, recovered_table_id)
)