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What is DevForce EF's approach to mapping OO Inheritance?
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sebma View Drop Down
Groupie
Groupie
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Joined: 19-Aug-2008
Location: Singapore
Posts: 66 		Post Options Post Options   Quote sebma Quote  Post ReplyReply Direct Link To This Post Topic: What is DevForce EF's approach to mapping OO Inheritance?
    Posted: 21-Aug-2008 at 11:24pm
Hi All,
Perhaps I have missed some details from DevForce EF documentation, or the Developers Guide in particular.
 
In C#, I hand coded my OO inheritance mapping (Table per Hierarchy way) with class attribute like the following to a database table like:

    [Table(Name="dbo.MyTable")]
    [InheritanceMapping(Code = 1, Type = typeof(MyBase), IsDefault = true)]
    [InheritanceMapping(Code = 2, Type = typeof(MyDerive1))]
    [InheritanceMapping(Code = 3, Type = typeof(MyDerive2))]
    [InheritanceMapping(Code = 4, Type = typeof(MyDerive3))]

Is there a known DevForce EF approach for these O/R impedance mapping?
 
Thanks!
Sebastian
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kimj View Drop Down
IdeaBlade
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Joined: 09-May-2007
Posts: 1391 		Post Options Post Options   Quote kimj Quote  Post ReplyReply Direct Link To This Post Posted: 24-Aug-2008 at 4:43pm
DevForce EF piggybacks on the inheritance features provided by the Entity Framework data model.  Take a look at http://blogs.msdn.com/adonet/archive/2007/03/15/inheritance-in-the-entity-framework.aspx on the ADO.NET team blog for more information on what can be done in EF. 
 
Although not yet ready as a tutorial, we do have a sample showing models built using TPT (table per type), TPH (table per hierarchy) and TPC (table per concrete type) which is available upon request.  Email support if interested.
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sebma View Drop Down
Groupie
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Joined: 19-Aug-2008
Location: Singapore
Posts: 66 		Post Options Post Options   Quote sebma Quote  Post ReplyReply Direct Link To This Post Posted: 24-Aug-2008 at 9:11pm
Will email support for sample models, thank-you kimj
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