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RJK Solutions
#1 Posted : Wednesday, November 19, 2008 10:54:10 AM
Rank: Administration

Groups: Administration

Joined: 6/20/2008
Posts: 409
Location: Cheshire, United Kingdom.
If AFSDK v1.3 connecting to a Model within a database was straightforward and simple but in AFSDK v2 OSI consider that previous approach (Models property of AFDatabase) to be obselete. Instead OSI encourages the use of "AFModel.FindModels" to search for models within an AF database.

For this example we will assume that we know the model exists so will reference it directly using the AFDatabase.Elements object and convert the element to a model (as we know it is a model).


Code:
Private Function ConnectToModel(ByVal WhichModel As String) As Boolean

        Dim ret As Boolean = False

        Try
            If (AfMod Is Nothing) Then AfMod = CType(AFDB.Elements(WhichModel), Modeling.AFModel)
            ret = Not (AfMod Is Nothing)
        Catch ex As Exception
            ret = False
        End Try

        Return ret

    End Function


Simple!
Now you have your model and can manipulate as you see fit.


OSIsoft PI System Specialists
PI consultancy on PI Systems, PISDK, AFSDK, OLEDB etc and PI custom developments. Well pretty much anything to do with PI!
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jen
#2 Posted : Thursday, December 04, 2008 2:43:39 AM
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Joined: 9/30/2008
Posts: 14
Location: Hongkong
What if I haven't created a model yet, (since the functionality of creating a model in PI System Explorer cannot be access)?
Thanks!
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RJK Solutions
#3 Posted : Wednesday, December 17, 2008 2:38:13 PM
Rank: Administration

Groups: Administration

Joined: 6/20/2008
Posts: 409
Location: Cheshire, United Kingdom.
Hi Jen,

You can create models within PI SystemExplorer:

-Create an AFDatabase.
-Within "Elements" right click on the root element and select "New Model".

You can also do this via AFSDK:

*Assumes you have an object AFDB defined as AFDatabase.

Code:

' Create an Element Template for the model.
Dim ModelTemplate As AFElementTemplate = AFDB.ElementTemplates.Add("JenModelTemplate")
ModelTemplate.InstanceType = GetType(AFModel)

' Create the model object, assign it the Element Template created above.
Dim TheModel As AFModel = CType(AFDB.Elements.Add("JenModel", ModelTemplate), AFModel)
TheModel.Description = "This is a model for Jen."

AFDB.ApplyChanges()



OSIsoft PI System Specialists
PI consultancy on PI Systems, PISDK, AFSDK, OLEDB etc and PI custom developments. Well pretty much anything to do with PI!
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