Azure 使用U-SQL查询JSON嵌套对象

我试图从下面得到国家和类别。 我可以得到国家，但不能得到类别

输入示例：

[{
    "context": {
        "location": {
            "clientip": "0.0.0.0",
            "continent": "Asia",
            "country": "Singapore"
        },
        "custom": {
            "dimensions": [{
                "Category": "Noah Version"
            }]
        }
    }
}]

我的问题是：

@json =
EXTRACT
    [location] string,
    [device] string,
    [custom.dimensions] string
FROM
    @InputFile
USING new JsonExtractor("context");

@CreateJSONTuple = 
SELECT 
JsonFunctions.JsonTuple([location]) AS LocationData,
JsonFunctions.JsonTuple([device]) AS DeviceData,
JsonFunctions.JsonTuple([custom.dimensions]) AS DimensionData
FROM @json;

@Dataset =
SELECT
LocationData["country"] ?? "NA" AS Country
,LocationData["province"] ?? "NA" AS Province
,LocationData["city"] ?? "N/A" AS City
,DeviceData["osVersion"] ?? "N/A" AS OsVersion
,DeviceData["roleName"] ?? "N/A" AS RoleName
,DimensionData["Category"] ?? "N/A" AS Category
FROM @CreateJSONTuple;


OUTPUT @Dataset
TO @transBlobOutputFile
USING Outputters.Csv(outputHeader:true,quoting:true);

---

您必须考虑到数组也由复杂类型组成。此外，您不能只使用

提取[custom.dimensions]字符串这样的表示法，您必须为其添加itermediate步骤以及以下步骤：

@json  =
    EXTRACT location String,
            device String,
            custom String
    FROM @InputFile
    USING new Microsoft.Analytics.Samples.Formats.Json.JsonExtractor("context");

@CreateJSONTuple =
    SELECT JsonFunctions.JsonTuple(location) AS LocationData,
           JsonFunctions.JsonTuple(device) AS DeviceData,
           JsonFunctions.JsonTuple(custom, "dimensions[0]") AS DimensionData
    FROM @json;

@result =
    SELECT LocationData["country"] ?? "N/A" AS Country,
           LocationData["province"] ?? "N/A" AS Province,
           LocationData["city"] ?? "N/A" AS City,
           DeviceData["osVersion"] ?? "N/A" AS OsVersion,
           DeviceData["roleName"] ?? "N/A" AS RoleName,
           DimensionData["dimensions[0]"] AS CategoryDimension
    FROM @CreateJSONTuple;

@result =
    SELECT Country,
           Province,
           City,
           OsVersion,
           RoleName,
           JsonFunctions.JsonTuple(CategoryDimension) AS CategoryDimension
    FROM @result;

@result =
    SELECT Country,
           Province,
           City,
           OsVersion,
           RoleName,
           CategoryDimension["Category"] AS Category
    FROM @result;

OUTPUT @result
TO @output
USING Outputters.Csv(outputHeader : true, quoting : true);

这将产生：

“国家”“省”“市”“OsVersion”“RoleName”“类别”

“新加坡”“不适用”“不适用”“Microsoft Windows NT 6.1.7601 Service Pack 1”“Connexx”“Noah版本”

请给出您迄今为止尝试过的代码。Peter我得到的是Country，但不是Category，它是空的。请不要发布脚本链接，而是将代码与一些示例数据和所需的输出示例一起放入问题中。谢谢Peter，我尝试过，但在保存时遇到错误，主要是代码和格式。所以我保留了github链接。请您跟随链接并帮助我。Peter如果我们在索引0处有类别，则此解决方案有效，但如果我们在其他索引处有类别，则此解决方案无效。请提出解决办法。非常感谢你的帮助。