Referencing JSON payload value in Azure Data Factory for If condition

问题

I have a Json file like so as a payload returned from an API call - which is an http dataset type in data factory.

{
    "count": 2,
    "name": "DatasetABC",
    "columnNames": [
        "Column_1",
        "Column_2"

    ],
    "rows": ["1234",
             "5678"

    ]

}

I would like to be able to use the count records returned in an If condition. Im wondering what I need to use to get the value of "count" which is 2.

Any help appreciated.

回答1:

Based on your description, i suppose you could use LookUp Activity in Azure Data Factory.

Lookup activity can retrieve a dataset from any of the Azure Data Factory-supported data sources. Use it in the following scenario:

Dynamically determine which objects to operate on in a subsequent activity, instead of hard coding the object name. Some object examples are files and tables. Lookup activity reads and returns the content of a configuration file or table. It also returns the result of executing a query or stored procedure. The output from Lookup activity can be used in a subsequent copy or transformation activity if it's a singleton value. The output can be used in a ForEach activity if it's an array of attributes.

For example,maybe you could access the count value by using @{activity('MyLookupActivity').output.firstRow.count} in the IF activity.

来源：https://stackoverflow.com/questions/54934549/referencing-json-payload-value-in-azure-data-factory-for-if-condition