我尝试使用 Azure 数据工厂从 FHIR 服务器读取数据，并将结果转换为 Azure Blob 存储中的换行符分隔 JSON (ndjson) 文件。具体来说，如果您查询 FHIR 服务器，您可能会得到类似以下内容:
{
"resourceType": "Bundle",
"id": "som-id",
"type": "searchset",
"link": [
{
"relation": "next",
"url": "https://fhirserver/?ct=token"
},
{
"relation": "self",
"url": "https://fhirserver/"
}
],
"entry": [
{
"fullUrl": "https://fhirserver/Organization/1234",
"resource": {
"resourceType": "Organization",
"id": "1234",
// More fields
},
{
"fullUrl": "https://fhirserver/Organization/456",
"resource": {
"resourceType": "Organization",
"id": "456",
// More fields
},
// More resources
]
}
基本上是一组资源。我想将其转换为换行符分隔(又名 ndjson)文件，其中每一行只是资源的 json:
{"resourceType": "Organization", "id": "1234", // More fields }
{"resourceType": "Organization", "id": "456", // More fields }
// More lines with resources
我能够设置 REST 连接器，并且它可以查询 FHIR 服务器(包括分页)，但无论我尝试什么，我似乎都无法生成我想要的输出。我设置了一个 Azure Blob 存储数据集:
{
"name": "AzureBlob1",
"properties": {
"linkedServiceName": {
"referenceName": "AzureBlobStorage1",
"type": "LinkedServiceReference"
},
"type": "AzureBlob",
"typeProperties": {
"format": {
"type": "JsonFormat",
"filePattern": "setOfObjects"
},
"fileName": "myout.json",
"folderPath": "outfhirfromadf"
}
},
"type": "Microsoft.DataFactory/factories/datasets"
}
并配置复制事件:
{
"name": "pipeline1",
"properties": {
"activities": [
{
"name": "Copy Data1",
"type": "Copy",
"policy": {
"timeout": "7.00:00:00",
"retry": 0,
"retryIntervalInSeconds": 30,
"secureOutput": false,
"secureInput": false
},
"typeProperties": {
"source": {
"type": "RestSource",
"httpRequestTimeout": "00:01:40",
"requestInterval": "00.00:00:00.010"
},
"sink": {
"type": "BlobSink"
},
"enableStaging": false,
"translator": {
"type": "TabularTranslator",
"schemaMapping": {
"resource": "resource"
},
"collectionReference": "$.entry"
}
},
"inputs": [
{
"referenceName": "FHIRSource",
"type": "DatasetReference"
}
],
"outputs": [
{
"referenceName": "AzureBlob1",
"type": "DatasetReference"
}
]
}
]
},
"type": "Microsoft.DataFactory/factories/pipelines"
}
但最后(尽管配置了模式映射)，blob 中的最终结果始终只是从服务器返回的原始包。如果我将输出 blob 配置为逗号分隔文本，我可以提取字段并创建扁平表格 View ，但这并不是我真正想要的。
如有任何建议，我们将不胜感激。
最佳答案
所以我找到了一个解决方案。如果我执行最初的转换步骤，将包简单地转储到 JSON 文件中，然后再将 JSON 文件转换为我假装为文本文件的内容到另一个 blob，则可以创建 njson 文件。
基本上，定义另一个 blob 数据集:
{
"name": "AzureBlob2",
"properties": {
"linkedServiceName": {
"referenceName": "AzureBlobStorage1",
"type": "LinkedServiceReference"
},
"type": "AzureBlob",
"structure": [
{
"name": "Prop_0",
"type": "String"
}
],
"typeProperties": {
"format": {
"type": "TextFormat",
"columnDelimiter": ",",
"rowDelimiter": "",
"quoteChar": "",
"nullValue": "\\N",
"encodingName": null,
"treatEmptyAsNull": true,
"skipLineCount": 0,
"firstRowAsHeader": false
},
"fileName": "myout.json",
"folderPath": "adfjsonout2"
}
},
"type": "Microsoft.DataFactory/factories/datasets"
}
请注意这个 TextFormat，还要注意 quoteChar 为空。如果我添加另一个复制事件:
{
"name": "pipeline1",
"properties": {
"activities": [
{
"name": "Copy Data1",
"type": "Copy",
"policy": {
"timeout": "7.00:00:00",
"retry": 0,
"retryIntervalInSeconds": 30,
"secureOutput": false,
"secureInput": false
},
"typeProperties": {
"source": {
"type": "RestSource",
"httpRequestTimeout": "00:01:40",
"requestInterval": "00.00:00:00.010"
},
"sink": {
"type": "BlobSink"
},
"enableStaging": false,
"translator": {
"type": "TabularTranslator",
"schemaMapping": {
"['resource']": "resource"
},
"collectionReference": "$.entry"
}
},
"inputs": [
{
"referenceName": "FHIRSource",
"type": "DatasetReference"
}
],
"outputs": [
{
"referenceName": "AzureBlob1",
"type": "DatasetReference"
}
]
},
{
"name": "Copy Data2",
"type": "Copy",
"dependsOn": [
{
"activity": "Copy Data1",
"dependencyConditions": [
"Succeeded"
]
}
],
"policy": {
"timeout": "7.00:00:00",
"retry": 0,
"retryIntervalInSeconds": 30,
"secureOutput": false,
"secureInput": false
},
"typeProperties": {
"source": {
"type": "BlobSource",
"recursive": true
},
"sink": {
"type": "BlobSink"
},
"enableStaging": false,
"translator": {
"type": "TabularTranslator",
"columnMappings": {
"resource": "Prop_0"
}
}
},
"inputs": [
{
"referenceName": "AzureBlob1",
"type": "DatasetReference"
}
],
"outputs": [
{
"referenceName": "AzureBlob2",
"type": "DatasetReference"
}
]
}
]
},
"type": "Microsoft.DataFactory/factories/pipelines"
}
然后一切就都解决了。这并不理想，因为我现在在 blob 中拥有两份数据副本，但我想其中一份很容易被删除。
如果有人有一步解决方案，我仍然很想听听。
关于azure - 使用 ADF REST 连接器读取和转换 FHIR 数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55857324/