3 Replies Latest reply on Nov 25, 2015 7:40 AM by qn RSS
    robw Newbie

    Query ValueStream with null entries

    I get the following error when invoking a simple query on a value stream (using the DataFilter and TimeSelectors in the mashup).

     

    [context: com.thingworx.webservices.context.HttpExecutionContext@71e1b30c][message: Unable to Invoke Service QueryPropertyHistory on N4A_Thing : null]

     

    Is this because the field I am querying has null values?  The query is simply gps_status equals to 1.  There are lots of entries where this exists, but all I get is the error.

     

    If I am not allowed to have null entries in the ValueStream, then how do I avoid this?  I need to filter out invalid location data when the GPS status is not valid.