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D
dwightwhe1-Visitor
1-Visitor
September 17, 2014
Question

Getting logged property values from value stream

  • September 17, 2014
  • 2 replies
  • 4782 views

Hi,

I have a Thing with some logged properties. Properties are defined in the ThingTemplate as logged, not persistent, not read-only. I also tried direct logged properties with the Thing not from the ThingTemplate.

I have a ValueStream created and have it attached to the Thing. Property values change regularly on a Timer event (and manually).

How can I access the logged values for the logged properties either from the value stream or the thing itself? I don't see any ValueStream services for accessing the stream values. The documentation does not speak to how to get value stream data. What do I miss?

Calling service GetLoggedProperties on the Thing returns the logged properties, so this is OK.

Calling service GetPropertyLogging on the direct properties returns true, on a inherited properties from the template returns an error.

Thingworx 5.0.2.33

Much appreciated!

    2 replies

    A
    adamtrainer5-Regular Member
    5-Regular Member
    September 18, 2014

    Hi Dwight,

    I'm working on getting some documentation together for the

    Services

    of a

    Value Stream

    . For the time being, I can tell you the

    Services

     for retrieving logged property values are on the

    Thing

     with the properties being logged. There are a number of

    Services

     for querying data for each basetype including

    QueryBooleanPropertyHistory()

    , 

    QueryNumberPropertyHistory()

     and 

    QueryInfoTablePropertyHistory()

     to name a few.


    I'll have to look into the error you're getting when calling

    GetPropertyLogging()

     on

    Properties

     inherited from a

    ThingTemplate

    . What is the error message?


    Regards,

    Adam



    D
    dwightwhe1-VisitorAuthor
    1-Visitor
    September 18, 2014

    Adam: The comment below should have been a reply to your post. Thanks

    D
    dwightwhe1-VisitorAuthor
    1-Visitor
    September 18, 2014

    Hi Adam,

    thanks a lot. The QueryTypePropertyHistory Services on the Thing with the logged property work for me.


    Regarding the observed error (is not a blocker for us): When I call Thing.GetPropertyLogging with a property inherited from the ThingTemplate, I get:

    Property  does not exist
    When I make this call with a property that I define directly with the Thing, I get a normal result. Independent of that, I can query the property history for all logged properties. Thing.GetLoggedProperties also returns all inherited and direct properties just fine.
    Thanks!


    A
    adamtrainer5-Regular Member
    5-Regular Member
    September 18, 2014
    Sure thing. I was able to reproduce this issue and I've logged it in our case tracker.
    Thanks for bringing this to our attention,
    Adam
    
        
                                                
    
        
    
    
    

            
    
                                        
    
            
                        
    
                                                                                                            
            
    

    

        
    
                    
    
    
    
    

    

    
    
    

                                        
    
                                                        
    
            
        
    
    

    

    

                                    
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