Question

阅读Azure门户我已经了解了如何通过Azure Functions对CosmosDB进行POST，PUT和GET操作。但删除，我不明白该怎么做。

我应该使用哪种绑定。它应该通过sql查询还是集合的方法发生，比如Remove（）？

        [**FunctionName**("EmployeeDocumentDB")]
        public static async Task<HttpResponseMessage> Run(
        [HttpTrigger(AuthorizationLevel.Function, "post", "put", "delete", Route = "EmployeeDocumentDB/partitionkey/{key}/id/{id}")]HttpRequestMessage req,
        [DocumentDB(
        databaseName: "MyDatabase",
        collectionName: "MyCollection",
        ConnectionStringSetting = "CosmosDBEmulator")] ICollector<Person> outputDocument,
        TraceWriter log)
    {
        dynamic data = await req.Content.ReadAsAsync<Person>();

        return req.CreateResponse(HttpStatusCode.Accepted);
    }

Answer 1

您可以直接绑定到DocumentClient本身，然后以编程方式删除文档。

[FunctionName("DeleteDocument")]
public static async Task Run(
    [TimerTrigger("00:01", RunOnStartup = true)] TimerInfo timer,
    [DocumentDB] DocumentClient client,
    TraceWriter log)
{
    var collectionUri = UriFactory.CreateDocumentCollectionUri("ItemDb", "ItemCollection");
    var documents = client.CreateDocumentQuery(collectionUri);

    foreach (Document d in documents)
    {
        await client.DeleteDocumentAsync(d.SelfLink);
    }
}

请参阅CosmosDBSamples

Answer 2

我更愿意利用Azure Cosmos DB的存储过程编程并批量删除单个存储过程中的文档，以获得更好的性能（网络流量延迟，事务的存储开销等）。有关详细信息，请参阅here。

要创建存储过程，您可以以简单的方式在Azure门户上为您的集合创建它。您可以按照示例here批量删除给定查询的文档。

对于您的azure函数，您可以调用以下代码执行存储过程以批量删除文档：

StoredProcedureResponse<object> result = await client.ExecuteStoredProcedureAsync<object>(
    UriFactory.CreateStoredProcedureUri("MyDatabase", "MyCollection", "bulkDeleteSproc"), 
    "SELECT c._self FROM c WHERE c.founded_year = 2008");

Answer 3

我合并了：

HTTP触发器
CosmoDB DocumentClient输入
具有查询字符串查找ID的CosmoDB输入

public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "delete")] HttpRequest req,
            [CosmosDB(databaseName: "storage", collectionName: "pizza", Id = "{Query.id}", PartitionKey = "{Query.storeId}", ConnectionStringSetting = "..."] Document document,
            [CosmosDB(databaseName: "storage", collectionName: "pizza", ConnectionStringSetting = ...)] DocumentClient client)
        {
            string storeId = req.Query["storeId"];

            if(document == null || string.IsNullOrEmpty(storeId))
                return new BadRequestResult();

            await client.DeleteDocumentAsync(document.SelfLink, new RequestOptions() { PartitionKey = new PartitionKey(storeId) });

            return new OkResult();
        }

通过azure函数删除CosmosDB中的文档

3 个答案: