列出数据集

列出项目中的所有现有数据集。

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:

代码示例

C#

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


using Google.Cloud.BigQuery.V2;
using System;
using System.Collections.Generic;
using System.Linq;

public class BigQueryListDatasets
{
    public void ListDatasets(
        string projectId = "your-project-id"
    )
    {
        BigQueryClient client = BigQueryClient.Create(projectId);
        // Retrieve list of datasets in project
        List<BigQueryDataset> datasets = client.ListDatasets().ToList();
        // Display the results
        if (datasets.Count > 0)
        {
            Console.WriteLine($"Datasets in project {projectId}:");
            foreach (var dataset in datasets)
            {
                Console.WriteLine($"\t{dataset.Reference.DatasetId}");
            }
        }
        else
        {
            Console.WriteLine($"{projectId} does not contain any datasets.");
        }
    }
}

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"
	"io"

	"cloud.google.com/go/bigquery"
	"google.golang.org/api/iterator"
)

// listDatasets demonstrates iterating through the collection of datasets in a project.
func listDatasets(projectID string, w io.Writer) error {
	// projectID := "my-project-id"
	ctx := context.Background()
	client, err := bigquery.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("bigquery.NewClient: %v", err)
	}
	defer client.Close()

	it := client.Datasets(ctx)
	for {
		dataset, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return err
		}
		fmt.Fprintln(w, dataset.DatasetID)
	}
	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

import com.google.api.gax.paging.Page;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQuery.DatasetListOption;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Dataset;

public class ListDatasets {

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

  public static void listDatasets(String projectId) {
    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();

      Page<Dataset> datasets = bigquery.listDatasets(projectId, DatasetListOption.pageSize(100));
      if (datasets == null) {
        System.out.println("Dataset does not contain any models");
        return;
      }
      datasets
          .iterateAll()
          .forEach(
              dataset -> System.out.printf("Success! Dataset ID: %s ", dataset.getDatasetId()));
    } catch (BigQueryException e) {
      System.out.println("Project does not contain any datasets \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

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

async function listDatasets() {
  // Lists all datasets in current GCP project.

  // Lists all datasets in the specified project
  const [datasets] = await bigquery.getDatasets();
  console.log('Datasets:');
  datasets.forEach(dataset => console.log(dataset.id));
}

PHP

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

use Google\Cloud\BigQuery\BigQueryClient;

/** Uncomment and populate these variables in your code */
// $projectId  = 'The Google project ID';

$bigQuery = new BigQueryClient([
    'projectId' => $projectId,
]);
$datasets = $bigQuery->datasets();
foreach ($datasets as $dataset) {
    print($dataset->id() . PHP_EOL);
}

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


from google.cloud import bigquery

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

datasets = list(client.list_datasets())  # Make an API request.
project = client.project

if datasets:
    print("Datasets in project {}:".format(project))
    for dataset in datasets:
        print("\t{}".format(dataset.dataset_id))
else:
    print("{} project does not contain any datasets.".format(project))

Ruby

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

require "google/cloud/bigquery"

def list_datasets project_id = "your-project-id"
  bigquery = Google::Cloud::Bigquery.new project: project_id

  puts "Datasets in project #{project_id}:"
  bigquery.datasets.each do |dataset|
    puts "\t#{dataset.dataset_id}"
  end
end