如何使用 Azure 云函数从 CosmosDB 中删除文档？

Question

我知道如何使用 Azure Cloud Functions 在我的 CosmosDB 实例中创建、读取和更新文档，但仍然不知道如何实现删除。我用作参考的主要文档是https://docs.microsoft.com/en-us/azure/azure-functions/functions-create-cosmos-db-triggered-function。

我尝试使用不带 id 的输入和输出绑定（从而获取整个集合），然后过滤我要从 inputDocuments 中删除的项目并将结果设置为 outputDocuments。不幸的是，这似乎并没有真正从数据库实例中删除该项目。知道我可能会错过什么吗？这样做的正确方法是什么？

这是我写的代码：

const { id } = req.query;
context.bindings.outputDocuments = context.bindings.inputDocuments;
const index = context.bindings.outputDocuments.findIndex(doc => doc.id === id);
const doc = context.bindings.outputDocuments.splice(index, 1);

我也尝试了一个更简单的版本，但这并没有什么不同：

const { id } = req.query;
context.bindings.outputDocuments = context.bindings.inputDocuments.filter(doc => doc.id !== id);

我使用日志语句验证了我的函数正确地更新了上述两种实现的 outputDocuments。

这是我的绑定：

{
  "bindings": [
    {
      "authLevel": "function",
      "type": "httpTrigger",
      "direction": "in",
      "name": "req",
      "methods": [
        "delete"
      ]
    },
    {
      "type": "http",
      "direction": "out",
      "name": "res"
    },
    {
      "type": "documentDB",
      "name": "inputDocuments",
      "databaseName": "heroesDatabase",
      "collectionName": "HeroesCollection",
      "connection": "ydogandjiev-documentdb_DOCUMENTDB",
      "direction": "in"
    },
    {
      "type": "documentDB",
      "name": "outputDocuments",
      "databaseName": "heroesDatabase",
      "collectionName": "HeroesCollection",
      "createIfNotExists": false,
      "connection": "ydogandjiev-documentdb_DOCUMENTDB",
      "direction": "out"
    }
  ],
  "disabled": false
}

Answer 1

您可以使用客户端并拨打DeleteDocumentAsync，如下例所述

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, string customerid, TraceWriter log, DocumentClient client)
{
    HttpResponseMessage response = new HttpResponseMessage();
    try {
        await client.DeleteDocumentAsync(UriFactory.CreateDocumentUri("BankDatabase","Customers", customerid));
        response.StatusCode = HttpStatusCode.OK;
        log.Info($"Deleted customer with id: {customerid}");
    }
    catch (DocumentClientException exc)
    {
        if (exc.StatusCode == HttpStatusCode.NotFound)
        {
            response = req.CreateResponse(HttpStatusCode.NotFound, "There is no item with given ID in our database!");
        }
        else
        {
            response = req.CreateResponse(HttpStatusCode.InternalServerError, "Internal server error. Contact administrator.");
        }
    }

    return response;
}

请在 Azure CosmosDB with Azure functions

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