Question

当前，我将CosmosDB与C＃中的SQL API结合使用。现在，当它在Event集合中创建新事件时，需要在EventData集合中创建一个具有相同ID，EventID和起源的文档。然后，需要将计数设置为1。如果文档已经存在于Event集合中，则会引发错误，指出eventid是唯一的，并且需要更新EventData中的相应计数。我将分区键设置为/ origin，将唯一键设置为/ eventid。这是我想出的，但是我尝试得到的任何东西都没有得到我需要的东西：

数据进入事件

{
    "id": randomly generated from cosmosdb,
    "eventid": "1234",
    "origin": "5.6.7.8"
}

需要在EventData中进行的操作

{
    "id": same as the id from the Event collection,
    "eventid": "1234",
    "origin": "5.6.7.8",
    "count": 1
}

然后，当一个事件进入并且事件ID为“ 1234”时，它将发现该事件已经存在于Event集合中，并递增EventData中的相应文档：

{
    "id": same as the id from the Event collection,
    "eventid": "1234",
    "origin": "5.6.7.8",
    "count": 2
}

天蓝色功能：

public static async Task CreateEventAndUpdateCountAsync(string database, string eventCollection, string eventDataCollection, string input){
    MyClass myClass = Newtonsoft.Json.JsonConvert.DeserializeObject<MyClass>(input);
    try
    {
        //try to create a document, if not catch error
        //create document in Event collection, and if no error create a document with the count of 1

        await client.CreateDocumentAsync(UriFactory.CreateDocumentCollectionUri(database, eventCollection), myClass, new RequestOptions { PartitionKey = new PartitionKey(myClass.origin) });
        Count count = new Count();
        count.eventid = myClass.eventid;
        count.origin = myClass.origin;
        await client.CreateDocumentAsync(UriFactory.CreateDocumentCollectionUri(database, eventDataCollection), count, new RequestOptions { PartitionKey = new PartitionKey(myClass.origin) });
    }
    catch (DocumentClientException de)
    {
        if (de.StatusCode == HttpStatusCode.Conflict)
        {
            // had it trying to read the document and do a ReplaceDocumentAsync
            // need to find the document in the EventData Collection with the same eventid as myClass and increase count by 1               
        }


        else
        {
            log.Info(de.ToString());
            throw;
        }        

    }
}

public class myClass {
    public string eventid { get; set; }
    public string origin { get; set; }
}

public class Count {
    public string eventid { get; set; }
    public string origin { get; set; }
    public int count { get; set; } = 1;
}

谢谢

Answer 1

CosmosDB SDK支持Upsert方法。如果缺少某些内容，则会创建此方法，如果存在，则会进行更新。

您可以将第二个CreateDocumentAsync呼叫更改为此：

await client.UpsertDocumentAsync(UriFactory.CreateDocumentCollectionUri(database, eventDataCollection), count, new RequestOptions { PartitionKey = new PartitionKey(myClass.origin) });

CosmosDB创建唯一的文档

1 个答案: