Azure函数-Cosmos数据库输入绑定查询不起作用

Question

I am trying to trigger azure function using Service Bus Queue trigger, which works fine. What I also want to do is use Cosmos Db input binding on the same function. The function gets triggered with the specific document and gets result with the input binding for simple query like:

Select * from c

But with a WHERE clause the same query does not return anything, though the condition is right and data is there in the DB against the contract Id passed in from the trigger:

Select * from c WHERE c.contractId = {contractId}

Following is the code of the Azure Function

#r "Microsoft.Azure.DocumentDB.Core"
using System;
using System.Collections.Generic;
using Microsoft.Azure.Documents;

public static void Run(IReadOnlyList<Document> input, ILogger log, IEnumerable<dynamic> documents)
{
    if (input != null && input.Count > 0)
    {
        log.LogInformation("Documents modified " + input.Count);
        log.LogInformation("First document Id " + input[0]);
    }
}

function.json

 {
  "bindings": [
    {
      "name": "myQueueItem",
      "type": "serviceBusTrigger",
      "direction": "in",
      "queueName": "tripend",
      "connection": "mobiiot_RootManageSharedAccessKey_SERVICEBUS"
    },
    {
      "type": "cosmosDB",
      "name": "documents",
      "databaseName": "ToDoList",
      "collectionName": "Items",
      "connectionStringSetting": "mobiiot_DOCUMENTDB",
      "direction": "in",
      "sqlQuery": "SELECT * from c where c.contractId= {contractId}"
    }
  ]
}

Trigger Data coming into Azure Function:

    {"vin":"WP0ZZZ99ZJS167001","milage":780.3333,"contractId":"19277",
"lat":51.47404,"lon":-0.45299000000000006,"noOfHardBreaks":0,"fuelConsumptionRate":22,
"speed":96,"status":"droppedOff","EventProcessedUtcTime":"2018-12-10T09:14:51.6474889Z",
"PartitionId":0,"EventEnqueuedUtcTime":"2018-12-10T09:14:51.5350000Z",
"IoTHub":{"MessageId":null,"CorrelationId":null,"ConnectionDeviceId":"WP0ZZZ99ZJS167001",
"ConnectionDeviceGenerationId":"636795108399273130",
"EnqueuedTime":"2018-12-10T09:14:51.5470000Z","StreamId":null}}

Answer 1

It seems your code doesn't match function.json . To set placeholder like {contractId} , we need to define a custom type to deserialize the JSON, so that function code could find contractId among the coming data.

Have a try at code below.

#r "Microsoft.Azure.DocumentDB.Core"
using System;
using System.Collections.Generic;
using Microsoft.Azure.Documents;

public static void  Run(QueueItem myQueueItem, ILogger log, IEnumerable<dynamic> documents)
{      
    foreach(var doc in documents)
    {
        log.LogInformation((string)doc.id);
    }
}
public class QueueItem
{
    public string contractId { get; set; }
}