Forum Discussion

joncmaloney's avatar
joncmaloney
New Member
4 years ago

Incremental Refresh Using M Query and paginated API

I'm trying to use an M Query to pull data from a paginated API. Currently the M Query works to pull all the paginated API data using
Json.Document(Web.Contents(Url))
The above line is run through a loop until there are no results returned.

When I try and use Incremental Refresh the service fails to refresh the data source. Is there a way to use Incremental Refresh to obtain Paginated API data via an M Query?

Need Help

7 Replies

  • lbendlin's avatar
    lbendlin
    Super User
    4 years ago

    Incremental Refresh is date time based. You need to have a filter transform in Power Query that includes the RangeStart and RangeEnd parameters.  So your API call must allow you to limit date time ranges. Then you can hand over these parameters to the API call, do your pagination, and return the combined data for that date time range. 

     

    NOTE:  This is INCREMENTAL refresh, not DIFFERENTIAL refresh. It does not handle data changes well.

    • joncmaloney's avatar
      joncmaloney
      New Member
      4 years ago

      Hi lbendlin, 

       

      Thanks for the reply. To be more specific when I have added RangeStart and RangeEnd based on this guide: 

      https://docs.microsoft.com/en-us/power-bi/connect-data/incremental-refresh-configure I append RangeStart and RangeEnd to the URL string that is used in: Json.Document(Web.Contents(Url)) as a query param. I can change the RangeStart and RangeEnd parameters reload the data and the dataset loaded into Power BI desktop shows new data based on the updated parameters. After I have setup the M Query I then publish the Power BI Query to a service (I believe incremental refresh is only possible when using a service). However when I have a look at the service I see the following error message about scheduled refresh. 

       

      Does this error message mean that the Url i'm using cannot be reached by the service or does it mean that M Queries cannot be used with scheduled refresh?

       

      Thanks again for your assistance so far with this issue. 

       

      Kind Regards, 

      Jon