Entity Framework 4 - Tallan`s Technology Blog

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Entity Framework 4 and WCF
Data Services 4
Max Weber - Senior Consultant
www.tallan.com
Presentation Goals
 Get
started with Entity Framework 4
 Get started with WCF Data Services 4
 Create website iBlog
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Presentation Agenda
 Entity
Data Model
 Entity Framework 4
 Open
 WCF
up Visual Studio
Data Services 4
 Open
up Visual Studio
 Summary
/ Questions
 Cake
Tallan, Inc. Proprietary and Confidential. Copyright 2010.
4/8/2015
What is the Entity Data Model?
 Entity
Data Model
 The
Entity Data Model (EDM) is a set of concepts that
describe the structure of data, regardless of its stored
form. The EDM borrows from the Entity-Relationship
Model described by Peter Chen in 1976, but it also
builds on the Entity-Relationship Model and extends its
traditional uses.
 Extensions to E-R Model:

Separation of the entities and relationships from their
storage medium

http://msdn.microsoft.com/en-us/library/ee382825.aspx
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Entity Data Model Key Concepts
 Entity
Type
 entity
key, inheritance, entity Sets, entity container
 Association
Type
 foreign
key, multiplicity, navigation properties,
association set, entity container
 Property
 Boolean,
Int32, String
 DateTime, Guid, Binary
 Complex Types
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4/8/2015
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Entity Framework Overview
Entity Framework Overview
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Entity Framework 4
 Conceptual
Model
 Storage Model
 Data Providers
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Conceptual Model – Entity Framework 4
 Conceptual
schema definition language (CSDL)
 Conceptual model == Domain model
 .csdl file extension
 CSDL is Entity Framework’s implementation of the
Entity Data Model
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Storage Model – Entity Framework 4
 Store
schema definition language (SSDL)
 Storage model == Logical model
 Storage models are provider-specific
 .ssdl file extension
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Mapping Concepts to Storage – EF4
 Mapping
specification language (MSL)
 Maps between conceptual and storage models
 .msl file extension
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Providers – Entity Framework 4
 EF
uses the ADO.NET Data Provider model
 Providers

MS SQL Server






Indirect access to other DBs using ODBC, OLEDB
VistaDB
Devart
OpenLink Software
Synergy
…5+ more
 ADO.NET

Data Providers List
http://msdn.microsoft.com/en-us/data/dd363565.aspx
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Entity Data Model Tools
 Entity
Data Model Wizard
 ADO.NET Entity Data Model Designer
 Update Model Wizard
 Command line tool EDM Generator (EdmGen.exe)
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Class Generation – Entity Framework
 T4
Templates used to generate Entity classes from
CSDL
 Entities based on EntitySet
 Tied
 Plain
to .NET, System.Data
Old CLR Objects (POCO)
 Need
POCO extension from Visual Studio Gallery
 POCO
Proxy
 Extensions from Visual Studio Gallery
 ADO.NET
POCO Entity Generator
 Tangible T4 Editor
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Code Time! – Entity Framework 4
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Entity Framework: Recap
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WCF Data Services
 Formerly
.NET Data Services (aka Astoria)
 Description:
 WCF
Data Services enables creation and consumption
of data services for the Web or an intranet by using the
Open Data Protocol (OData).
Architecture Overview :
WCF Data Services
RESTful work – WCF Data Services
 Exposes
data as resources (URI)
 http://localhost/Northwind.svc/Customers(‘ALFKI’)
 http://localhost/Northwind.svc/Customers('ALFKI')/Orders
?$filter=Freight gt 50
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Open Data Protocol (OData)
 Definition
 OData
enables you to expose your data as resources
that are addressable by URIs
 Enables you to access and change data by using the
semantics of representational state transfer (REST)
 Standard HTTP verbs supported:

GET, PUT, POST, DELETE.
Reference: WCF Data Services Overview http://msdn.microsoft.com/library/cc668794.aspx
Output Formats – WCF Data Services
 Atom
 JSON
 XML
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Freedom of data source – WCF Data Services
 Entity
Framework Provider
 Uses
Entity Data Models to structure access
 Reflection
Provider
 Exposes data

structures with interface IQueryable
Create/Update/Delete with interface IUpdatable
 Custom
 Roll
 Link
Provider
your own
to WCF Data Services Providers

http://msdn.microsoft.com/en-us/library/dd672591.aspx
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Custom Business Logic – WCF Data Services
 Service
 Act
Operators
at a service level
 Interceptors
 Act
at an entity set level
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Client Libraries – WCF Data Services
 WCF
Data Services Client Library
 .NET
Framework
 Silverlight
 OData
SDK
 Javascript (AJAX)
 PHP
 Java
 Ruby
 Windows Phone
7 (not yet released)
 Objective-C (iPhone) (not yet released)
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Code Time! – WCF Data Services
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WCF Data Services Atom feeds in IE
 OOTB
IE Experience with WCF DS Atom feeds bad
 Make this change to see Atom feeds properly:
 Tools-> Internet
Options -> Feeds and Web Slices
(Settings)

Uncheck “Turn on feed reading view”
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Recap:
WCF Data Services
In Summary
 Entity
Data Model
 Entity Framework 4
 Conceptual
Model
 Storage Model
 Class generation using T4 Templates
 WCF
Data Services 4
 OData
v2
 RESTful services
 Multiple Data Providers
 Multiple Output formats
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Distribution of slide deck
 This
slide deck will be made available from the
following locations:
 Tallan
blogs - blogs.tallan.com
 CTDOTNET – www.ctdotnet.org
Resources and Questions? Then Cake











Visual Studio Gallery
Visual Studio - Entity Framework 4.0 and WCF Data Services
4.0 in Visual Studio 2010
What's New and Cool in Entity Framework 4.0 –
DevelopMentor
ADO.NET Entity Framework
Entity Framework At-a-Glance
WCF Data Services
WCF Data Services Overview
WCF (ADO.NET) Data Services At-a-Glance
Data Development Videos
Programming Entity Framework
Don't Be Iffy (Julie Lerman)
It’s time for cake!
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