通过流分析将带有数组的流传递给 SQL 中的多行

Question

我有来自 IoT Hub 的流，例如：

{
    "topic": "saveData",
    "deviceId": "testDevice",
    "data": [
        {
            "timestamp": "2018-04-06T11:46:11.842305",
            "device": "baiTest",
            "variable": "Status01_Test",
            "name": "m_01_test",
            "value": 365
        },
        {
            "timestamp": "2018-04-06T11:46:11.842306",
            "device": "hmuTest",
            "variable": "Status02_Test",
            "name": "m_02_test",
            "value": 817
        },
        {
            "timestamp": "2018-04-06T11:46:11.842307",
            "device": "vwzTest",
            "variable": "Status03_Test",
            "name": "m_03_test",
            "value": 247
        }
    ]
}

我想像这样在 SQL 数据库中传递此流：

deviceId    timestamp                   device   variable       name       value
testDevice  2018-04-06T11:46:11.842305  baiTest  Status01_Test  m_01_test  365
testDevice  2018-04-06T11:46:11.842306  hmuTest  Status02_Test  m_02_test  817
testDevice  2018-04-06T11:46:11.842307  vwzTest  Status03_Test  m_03_test  247

到目前为止我的代码是：

WITH itemList AS ( 
    SELECT deviceId, GetArrayElement(data,0) as datas
    FROM [iotHub] WHERE topic = 'saveData' )
SELECT deviceId, datas.timestamp, datas.device, datas.variable, datas.name, datas.value
INTO [sqlTable]
FROM itemList

但这仅将 data.array 的第一个索引 [0] 存储到 SQL 中。我认为存储数组可以用 **GetArrayElements** 函数处理，但我无法管理它。

Answer 1

您应该使用 GetArrayElements 在 Azure 流分析中展平复杂的 json。请参考以下查询。

SELECT   
  iothubAlias.deviceId,
  arrayElement.ArrayValue.timestamp,
  arrayElement.ArrayValue.device,
  arrayElement.ArrayValue.variable,
  arrayElement.ArrayValue.name,
  arrayElement.ArrayValue.value
FROM [iothub-input] as iothubAlias  
CROSS APPLY GetArrayElements(iothubAlias.data) AS arrayElement

你会得到你想要的结果。

通过流分析将带有数组的流传递给 SQL 中的多行

pass stream with array to multiple rows in SQL by Stream Analytics

sql

arrays

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azure-sql-database

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