Building nTier Applications with Entity Framework Services (Part 2)

Building nTier Applications with Entity Framework ServicesPart 2

Check Out Your Local User Groups!
San Diego Cloud Computing User Group
www.azureusergroup.com/group/sandiegoazureusergroup
San Diego .NET Developers Group
www.sddotnetdg.org
San Diego .NET User Group
www.sandiegodotnet.com
San Diego SQL Server User Group
www.sdsqlug.org

Win Free Software!
Rules
Provide your business card (or email and name)*
Indicate on the back what software you are interested in
Otherwise I will pick 
Winners will be picked next week
*Yes, most likely I’m going to send you and email about my user group (sddotnetdg.org) and or web site (dotNetTips.com)
Prizes
CodeRush and Refactor Pro from DevExpress (4)
SecondCopy (automatic backup software) (5) *
CodeIt.Right Standard from SubMain (4)
*Requires mailing address and phone number

Agenda

Exposing your Data over the wire (internet)
Service Layer

User Experience
Security
Active Directory, Card Space, Windows Identity Foundation
UI Components
Windows Forms, Windows Presentation Foundation, ASP.NET (AJAX, MVC), Silverlight, Windows Mobile
Presentation Layer
Local Storage/ Cache
Communications Layer
Windows Communication Foundation (WCF), WCF Data Services, Web Services, Sync Services, Azure (Cloud), RIA Services, Workflow Services
Business Layer
Business Entities
T4 Templates
Business Components
Business Workflow
Windows Workflow Foundation
Data Layer
Entity Framework, LINQ to SQL, DataSets
SQL Server

SOAP Issues
Complex
Slow
Heavyweight
Tied to development tools and libraries
Not supported universally
Cross-vendor/platform interoperability NOT perfect

REST == Architectural Stylefor connecting distributed applications
Server-side resources identified by URI
Access resources over HTTP/ HTTPS
Returned data is “plain”: Atom, plain-XML or JSON

What is REST?
Representational State Transfer
An architectural style developed by Roy Fielding
Resource based not RPC based
Based on HTTP
Standard resource formats
Stateless communication between client and server
GET, POST, PUT, DELETE
Addressable resources + hyperlinking

XML
XML
JSON
JSON
How REST Works
Client
Server
URL
Resources
VERB
(GET, POST, PUT, DELETE)
Resource 1
Representation
Resource 2
Status
Representation

What is OData?
Protocol for sharing data via HTTP, AtomPub and JSON
Open
A way to break down data silos
The ATOMPub and JSON format used by “Astoria” or WCF Data Services

Data Services Clients
HTTP
(Open Data Protocol)
WCF Data Services
SQL Server 2008 Reporting Services
Windows Azure
Table Storage

OData SDK – Client Library(March 2010)
OData JavaScript Library
OData SDK for PHP
Restlet ext. for Java
OData client lib for WP7
OData SDK for ObjC
Data Services update for .NET 3.5 SP1
.NET 4.0
Silverlight 4.0

OData Consumers
Modern web browsers
OData explorer
Excel 2010 – PowerPivot
LINQPad
Sesame

Easily Expose Your Entities
WCF Data Services & OData

WCF Data Services Overview
Framework from Microsoft that that facilitates the creation of RESTful data services via HTTP endpoints
Shipped with .NET 3.5 SP1
Updates for 3.1 SP1 and .NET 4.0
Built on top of WCF4
Data representation in ATOM or JSON

WCF Data Services Overview
Automates the exposure of data as RESTful resources
Anything that implements IQueryable<T> and IUpdatable<T>
Entity Framework
3rd party ORMs
LINQ to SQL, custom data driven CLR classes
Custom URI based querying

HTTP
Open Data Protocol (OData)
Hosting/HTTP Listener
Data Services Runtime
Data Access Layer
Entity
Framework
Custom LINQ Provider
Relational Database
Other Sources

WCF 4
Programming Model
Core Services
Web HTTP Services
Data Services
RIA Services
Workflow Services
Service Model
Data Contract
Service Contract
Service Behavior
Channel Model
Formats
(Atom, JSON, XML,…)
Transports
(HTTP, TCP, …)
Protocols
(SOAP, HTTP, Open Data Protocol,…)

URL Conventions
Addressing entities and sets
Presentation options

Service Operations
Additional way to expose resources via URIs
[WebGet] is used for an addressable query
[WebInvoke] is used for insert, update, and delete
Can return a scalar value
IEnumerable or IQueryable
Astoria’s URI exposes the Service Operation
If you use IQueryable you can append query strings to the URI

Data Interceptors
Query Interceptors
Logic that will run when a resource is requested
Can be used to limit the data viewed, log, or perform security check
Change Interceptors
Logic that will run when a change (Add/Edit/Delete) request is made

Securing WCF Data Services
Using the Host’s authentication model
Role based authorization
EntitySetRights
Hiding Sensitive Data
[IgnoreProperties]
QueryInterceptors
ServiceOperations to validate users
Brute force: HTTPS, SSL, IP Filtering
SQL Server Security should not be ignored either!

What’s New in .NET 4
Data Binding
New DataServiceCollection class provides simplified binding of data service data to (WPF) controls. Includes auto updating.
Counting Entities in an Set
$count - total number of resources returned by a URI
$inlinecount - total resource count together with the resource data
Server-driven Paging
Service can be configured to return requested resources as a set of paged responses

JSON/
XML
HTTP/REST
WCF Data Service
DataServiceContext
Data Binding
HTTP/REST
Entity Framework
ObjectContext available
ObjectContext not available
Distributed system – WCF Data service
SQL Server 2008

What’s New in .NET 4
Query Projections
Query results can be modified to include only a subset of properties by using the new $select query option.
Custom Data Service Providers
Can implement a set of new data service provider interfaces, you can use various types of data with a data service, even when the data model changes during execution.
Streaming of Binary Resources
This enables you to retrieve and save binary large object data independent of the entity to which it belongs.

Summary

Resources
WCF Data Services Learning Guide:
http://msdn.microsoft.com/en-us/data/bb931106.aspx
WCF Data Services Team Blog
http://blogs.msdn.com/astoriateam

Required Book!
EF4 In Aug 2010

Building nTier Applications with Entity Framework Services (Part 2)

by David McCarter on Jun 26, 2010

Accessibility

Categories

Tags

Upload Details

Usage Rights

2 Embeds 4

Statistics

Building nTier Applications with Entity Framework Services (Part 2) — Presentation Transcript

http://speakerrate.com	3
http://www.slideshare.net	1