Question

首先，我们要从其中一台设备发送（并记录）校准消息。然后，在完全校准之后，我们要发送常规的IoT遥测消息。

工作流程是：数据从IoT中心到Azure流分析，再到Azure Sql数据库。

IoT消息的内容可以根据是否正在校准设备而改变。为了识别设备校准，我们将设备的名称字段更改为包含“ calibration”。然后，为了发送常规遥测数据，设备的名称将恢复为包含其名称的名称。

因此，在ASA中，确定消息是否为校准消息：我们检查设备名称字段的内容。

因此，该问题需要通过以下方式解决：

if message-contents.device-name = 'calibration' then
 get these 10 fields from the message
 write them to Calibration DB
else
 get these different 5 fields from the message
 call a ML function with some of these input fields
 write result to Telemetry DB
end

我尝试编写使用CASE语句的Azure流分析代码。

WITH ALLMESSAGES AS ( 
SELECT *
FROM iothubinput2018aug21 ),

QUERY1 AS (
SELECT try_cast(deviceid as nvarchar(max)) AS DEVICE_NAME, 
       try_cast(device as nvarchar(max)) as DEVICE_MAC_ID,
       try_cast(devicenumber as nvarchar(max)) as DEVICE_UID,
       try_cast(emptymax as nvarchar(max)) as EMPTYMAX,
       try_cast(emptymin as nvarchar(max)) as EMPTYMIN,
       try_cast(emptysum as nvarchar(max)) as EMPTYSUM,
       try_cast(fullmax as nvarchar(max)) as FULLMAX,
       try_cast(fullmin as nvarchar(max)) as FULLMIN,
       try_cast(fullsum as nvarchar(max)) as FULLSUM,
       try_cast(emptyresult as nvarchar(max)) as EMPTYRESULT,
       try_cast(fullresult as nvarchar(max)) as FULLRESULT,
       try_cast(fw as nvarchar(max)) as FIRMWARE_VERSION,
       TRY_CAST(SYSTEM.TIMESTAMP AS DATETIME) AS ASA_POSTTIME,
       0 AS REC_READ
FROM ALLMESSAGES
WHERE DEVICE_NAME = 'calibration'),

QUERY2 AS (
SELECT
       try_cast(deviceid as nvarchar(max)) AS DEVICE_NAME, 
       try_cast(device as nvarchar(max)) as DEVICE_MAC_ID,
       try_cast(uid as nvarchar(max)) as DEVICE_UID,
       try_cast(weight as nvarchar(max)) as DEVICE_SENSOR_READINGS,
       TRY_CAST(SYSTEM.TIMESTAMP AS DATETIME) AS ASA_POSTTIME,
       MLFunctionBatch2019Apr10(DEVICE_MAC_ID, DEVICE_SENSOR_READINGS) AS RESULT,
       UDF.SUMOFREADINGS(DEVICE_SENSOR_READINGS) AS DEVICE_SENSOR_READINGS_SUM,
       0 AS REC_READ
FROM ALLMESSAGES
WHERE DEVICE_NAME != 'calibration')

SELECT DEVICE_NAME, 
       DEVICE_MAC_ID,
       DEVICE_UID,
       DEVICE_SENSOR_READINGS,
       ASA_POSTTIME, 
       CASE result."Scored Labels" WHEN '1' THEN 'FULL' ELSE 'EMPTY' END AS MLSVC_RESULT,
       REC_READ,
       DEVICE_SENSOR_READINGS_SUM
INTO OUT2SQLDBDEV                
FROM QUERY2
WHERE DEVICE_MAC_ID != 'calibration'

SELECT DEVICE_NAME, 
       DEVICE_MAC_ID,
       DEVICE_UID,
       EMPTYMAX,
       EMPTYMIN,
       EMPTYSUM,
       FULLMAX,
       FULLMIN,
       FULLSUM,
       EMPTYRESULT,
       FULLRESULT,
       FIRMWARE_VERSION,
       ASA_POSTTIME,
       REC_READ
INTO OUT2SQLDBCALIBRATIONDEV
FROM QUERY1
WHERE DEVICE_MAC_ID = 'calibration'

我希望根据设备名称是校准还是其他名称，输出将转到正确的DB表。这没有发生。没有输出出来。再次尝试，ASA查询失败，因为数据库字段期望NOT NULL值，但是查询发送NULL值。

Answer 1

我必须对值进行一些合并以确保它们不为NULL，然后查询才起作用。请参见下面。

WITH ALLMESSAGES AS ( 
SELECT *
FROM iothubinput2018aug21 ),

QUERY1 AS (
SELECT
       try_cast(deviceid as nvarchar(max)) AS DEVICE_NAME, 
       try_cast(device as nvarchar(max)) as DEVICE_MAC_ID,
       try_cast(uid as nvarchar(max)) as DEVICE_UID,
       try_cast(weight as nvarchar(max)) as DEVICE_SENSOR_READINGS,
       TRY_CAST(SYSTEM.TIMESTAMP AS DATETIME) AS ASA_POSTTIME,
       '1' AS RESULT,
        UDF.SUMOFREADINGS(try_cast(weight as nvarchar(max))) AS DEVICE_SENSOR_READINGS_SUM,
       0 AS REC_READ
FROM ALLMESSAGES
WHERE COALESCE(deviceid,'NULL') != 'calibration'), 

QUERY2 AS (
SELECT try_cast(deviceid as nvarchar(max)) AS DEVICE_NAME, 
       try_cast(device as nvarchar(max)) as DEVICE_MAC_ID,
       try_cast(devicenumber as nvarchar(max)) as DEVICE_UID,
       try_cast(emptymax as nvarchar(max)) as EMPTYMAX,
       try_cast(emptymin as nvarchar(max)) as EMPTYMIN,
       try_cast(emptysum as nvarchar(max)) as EMPTYSUM,
       try_cast(fullmax as nvarchar(max)) as FULLMAX,
       try_cast(fullmin as nvarchar(max)) as FULLMIN,
       try_cast(fullsum as nvarchar(max)) as FULLSUM,
       try_cast(emptyresult as nvarchar(max)) as EMPTYRESULT,
       try_cast(fullresult as nvarchar(max)) as FULLRESULT,
       try_cast(fw as nvarchar(max)) as FIRMWARE_VERSION,
       TRY_CAST(SYSTEM.TIMESTAMP AS DATETIME) AS ASA_POSTTIME,
       0 AS REC_READ
FROM ALLMESSAGES
WHERE COALESCE(deviceid,'NULL') = 'calibration')

SELECT DEVICE_NAME, 
       DEVICE_MAC_ID,
       DEVICE_UID,
       DEVICE_SENSOR_READINGS,
       ASA_POSTTIME, 
       'FULL' AS MLSVC_RESULT,
       REC_READ,
       DEVICE_SENSOR_READINGS_SUM
INTO OUT2SQLDBDEV                
FROM QUERY1
WHERE COALESCE(DEVICE_NAME, 'NULL') != 'calibration'

SELECT DEVICE_NAME, 
       DEVICE_MAC_ID,
       DEVICE_UID,
       DEVICE_SENSOR_READINGS,
       ASA_POSTTIME, 
       'FULL' AS MLSVC_RESULT,
       REC_READ,
       DEVICE_SENSOR_READINGS_SUM
INTO OUT2BLOB2018OCT24              
FROM QUERY1
WHERE COALESCE(DEVICE_NAME, 'NULL') != 'calibration'

SELECT DEVICE_NAME, 
       DEVICE_MAC_ID,
       DEVICE_UID,
       EMPTYMAX,
       EMPTYMIN,
       EMPTYSUM,
       FULLMAX,
       FULLMIN,
       FULLSUM,
       EMPTYRESULT,
       FULLRESULT,
       FIRMWARE_VERSION,
       ASA_POSTTIME,
       REC_READ
INTO OUT2SQLDBCALIBRATIONDEV
FROM QUERY2
WHERE COALESCE(DEVICE_NAME, 'NULL') = 'calibration'

Azure流分析处理/路由来自SAME设备的不同大小和内容的IoT消息的推荐方法是什么

1 个答案: