Azure CosmosDB：函数应用 - 如何更新文档

Question

我是 Azure 的新手。我想知道是否可以通过 https 触发器更新现有记录。

我在网上找到的许多解决方案要么是创建新记录，要么是更新完整的文档。我只想更新文档中的 2 个属性。

I tried [this][1] and the following code but it didn't work
    [FunctionName("Function1")]
    public static HttpResponseMessage Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]HttpRequestMessage req,
       [DocumentDB("MyDb", "MyCollection", ConnectionStringSetting = "MyCosmosConnectionString")] out dynamic document,
       TraceWriter log)
    {
        log.Info("C# HTTP trigger function processed a request.");
    
        dynamic data = req.Content.ReadAsAsync<object>().GetAwaiter().GetResult();
        document = data;
    
        return req.CreateResponse(HttpStatusCode.OK);
    }

我想传递文档可以根据主字符串更新的主键和 2 个其他值。有人可以帮忙吗？

Answer 1

我只想更新文档中的 2 个属性。

截至 2020/10/20，此功能仍不支持。您可以在此查看进度：

https://feedback.azure.com/forums/263030-azure-cosmos-db/suggestions/6693091-be-able-to-do-partial-updates-on-document#{toggle_previous_statuses}

支持该功能的工作一年前就开始了，现在还没有完成，我们唯一能做的就是等待。

在您这边，您需要获取文档，更改内部然后更新。

一个简单的例子：

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Azure.Cosmos;
using System.Collections.Generic;

namespace FunctionApp21
{
    public static class Function1
    {
        private static CosmosClient cosmosclient = new CosmosClient("AccountEndpoint=https://testbowman.documents.azure.com:443/;AccountKey=xxxxxx;");
        [FunctionName("Function1")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            CosmosContainer container = cosmosclient.GetContainer("testbowman", "testbowman");

            ItemResponse<ToDoActivity> wakefieldFamilyResponse = await container.ReadItemAsync<ToDoActivity>("testbowman", new PartitionKey("testbowman"));
            ToDoActivity itemBody = wakefieldFamilyResponse;

            itemBody.status = "This is been changed.";
            wakefieldFamilyResponse = await container.ReplaceItemAsync<ToDoActivity>(itemBody, itemBody.id, new PartitionKey(itemBody.testbowman));
            return new OkObjectResult("");
        }
    }
    public class ToDoActivity
    {
        public string id { get; set; }
        public string status { get; set; }

        public string testbowman { get; set; }
    }
}

官方文档：

https://docs.microsoft.com/en-us/azure/cosmos-db/create-sql-api-dotnet-v4#replace-an-item