带有 .NET 文档/示例的 Google BigQuery [英] Google BigQuery with .NET documentation/ samples

问题描述

我需要使用 Google BigQuery API 查询数据.但是我正在努力寻找 .NET 示例，并且二进制文件 (Google.Apis.Bigquery.dll) 中没有包含任何文档.有人可以向我提供 .NET 的示例用法吗?

I require to query data using Google BigQuery API. But I am struggling to find .NET Samples, and there was no documentation included with the binary (Google.Apis.Bigquery.dll). Can anybody provide me with sample usage for .NET?

推荐答案

这是一个工作示例，部分基于 Michael 的回复:

Here's a working sample, based in part off of Michael's response:

using DotNetOpenAuth.OAuth2;
using Google.Apis.Authentication.OAuth2;
using Google.Apis.Authentication.OAuth2.DotNetOpenAuth;

using Google.Apis.Bigquery.v2;
using Google.Apis.Bigquery.v2.Data;

using Google.Apis.Util;
using System;
using System.Diagnostics;
using System.Collections.Generic;

namespace BigQueryConsole
{
    public class BigQueryConsole
    {
        // Put your client ID and secret here (from https://developers.google.com/console)
        // Use the installed app flow here.
        // Client ID looks like "9999999.apps.googleusercontent.com"
        static string clientId = "YOURCLIENTID";  
        static string clientSecret = "YOURSECRET";

        // Project ID is in the URL of your project on the APIs Console
        // Project ID looks like "999999";
        static string projectId = "YOURPROJECTID";

        // Query in SQL-like form
        static string query = "SELECT state, count(*) from [publicdata:samples.natality] GROUP BY state ORDER BY state ASC";

        public static void Main(string[] args)
        {
            // Register an authenticator.
            var provider = new NativeApplicationClient(GoogleAuthenticationServer.Description);

            provider.ClientIdentifier = clientId;
            provider.ClientSecret = clientSecret;

            // Initiate an OAuth 2.0 flow to get an access token

            var auth = new OAuth2Authenticator<NativeApplicationClient>(provider, GetAuthorization);

            // Create the service.
            var service = new BigqueryService(auth);
            JobsResource j = service.Jobs;
            QueryRequest qr = new QueryRequest();
            qr.Query = query;

            QueryResponse response = j.Query(qr, projectId).Fetch();
            foreach (TableRow row in response.Rows)
            {
                List<string> list = new List<string>();
                foreach (TableRow.FData field in row.F)
                {
                    list.Add(field.V);
                }
                Console.WriteLine(String.Join("	", list));
            }
            Console.WriteLine("
Press enter to exit");
            Console.ReadLine();
        }

        private static IAuthorizationState GetAuthorization(NativeApplicationClient arg)
        {
            // Get the auth URL:
            IAuthorizationState state = new AuthorizationState(new[] {  BigqueryService.Scopes.Bigquery.GetStringValue() });
            state.Callback = new Uri(NativeApplicationClient.OutOfBandCallbackUrl);
            Uri authUri = arg.RequestUserAuthorization(state);

            // Request authorization from the user (by opening a browser window):
            Process.Start(authUri.ToString());
            Console.Write("  Authorization Code: ");
            string authCode = Console.ReadLine();
            Console.WriteLine();

            // Retrieve the access token by using the authorization code:
            return arg.ProcessUserAuthorization(authCode, state);
        }
    }
}

这使用同步查询.对于异步查询，代码会略有不同.

This uses synchronous queries. For asyncronous queries, the code would be slightly different.

您需要引用 BigQuery 服务 dll(在二进制下载中的Services"目录下)以及Lib"目录中的其他 dll.二进制版本在这里:http://code.google.com/p/google-api-dotnet-client/wiki/Downloads#Latest_Stable_Release

You'll need to reference both the BigQuery service dll (under 'Services' directory in the binary download), plus the other dlls in the 'Lib' directory. Binary release is here: http://code.google.com/p/google-api-dotnet-client/wiki/Downloads#Latest_Stable_Release

.NET 代码将与 Java 库代码非常相似(它们是根据相同的 API 描述生成的):https://developers.google.com/bigquery/docs/developers_guide#batchqueries

The .NET code is going to be very similar to the Java library code (they're generated off of the same API description): https://developers.google.com/bigquery/docs/developers_guide#batchqueries

我们很快就会收到更多样品，但希望这能在此期间有所帮助.

We'll get more samples out there soon, but hopefully this helps in the meantime.

这篇关于带有 .NET 文档/示例的 Google BigQuery的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！