U型SQL - 从复杂的JSON对象

提取的资料，因此我有很多的结构是这样的JSON文件：U型SQL - 从复杂的JSON对象

{ 
    "Id": "2551faee-20e5-41e4-a7e6-57bd20b02a22", 
    "Timestamp": "2016-12-06T08:09:57.5541438+01:00", 
    "EventEntry": { 
     "EventId": 1, 
     "Payload": [ 
      "1a3e0c9e-ef69-4c6a-ac8c-9b2de2fbc701", 
      "DHS.PlanCare.Business.BusinessLogic.VisionModels.VisionModelServiceWithoutUnitOfWork.FetchVisionModelsForClientOnReferenceDateAsync(System.Int64 clientId, System.DateTime referenceDate, System.Threading.CancellationToken cancellationToken)", 
      25, 
      "DHS.PlanCare.Business.BusinessLogic.VisionModels.VisionModelServiceWithoutUnitOfWork+<FetchVisionModelsForClientOnReferenceDateAsync>d__11.MoveNext\r\nDHS.PlanCare.Core.Extensions.IQueryableExtensions+<ExecuteAndThrowTaskCancelledWhenRequestedAsync>d__16`1.MoveNext\r\n", 
      false, 
      "2197, 6-12-2016 0:00:00, System.Threading.CancellationToken" 
     ], 
     "EventName": "Duration", 
     "KeyWordsDescription": "Duration", 
     "PayloadSchema": [ 
      "instanceSessionId", 
      "member", 
      "durationInMilliseconds", 
      "minimalStacktrace", 
      "hasFailed", 
      "parameters" 
     ] 
    }, 
    "Session": { 
     "SessionId": "0016e54b-6c4a-48bd-9813-39bb040f7736", 
     "EnvironmentId": "C15E535B8D0BD9EF63E39045F1859C98FEDD47F2", 
     "OrganisationId": "AC6752D4-883D-42EE-9FEA-F9AE26978E54" 
    } 
}

我怎样才能创建一个输出

Id, 
Timestamp, 
EventEntry.EventId and 
EventEntry.Payload[2] (value 25 in the example below)

是u-SQL查询

我无法弄清楚如何延长我的查询

@extract = 
    EXTRACT 
     Timestamp DateTime 
    FROM @"wasb://xxx/2016/12/06/0016e54b-6c4a-48bd-9813-39bb040f7736/yyy/{*}/{*}.json" 
    USING new Microsoft.Analytics.Samples.Formats.Json.JsonExtractor(); 

@res = 
    SELECT Timestamp 
    FROM @extract; 

OUTPUT @res TO "/output/result.csv" USING Outputters.Csv();

我见过一些例子，如：

U- SQL Unable to extract data from JSON file =>这只查询文档的一个级别，我需要来自多个级别的数据。

U-SQL - Extract data from json-array =>这只查询文档的一个级别，我需要来自多个级别的数据。

来源

2016-12-07 Peter Bons

可能是这可以帮助你http://stackoverflow.com/questions/27198694/accesing-nested-properties-json –

JSONTuple一次性支持多个JSONPath。

@extract = 
    EXTRACT 
     Id String, 
     Timestamp DateTime, 
     EventEntry String 
    FROM @"..." 
    USING new Microsoft.Analytics.Samples.Formats.Json.JsonExtractor(); 

@res = 
    SELECT Id, Timestamp, EventEntry, 
    Microsoft.Analytics.Samples.Formats.Json.JsonFunctions.JsonTuple(EventEntry, 
     "EventId", "Payload[2]") AS Event 
    FROM @extract; 

@res = 
    SELECT Id, 
    Timestamp, 
    Event["EventId"] AS EventId, 
    Event["Payload[2]"] AS Something 
    FROM @res;

来源

2016-12-07 15:02:57

谢谢，正是我在找的！ –