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 Groupwww.azureusergroup.com/group/sandiegoazureusergroupSan Diego .NET Developers Groupwww.sddotnetdg.orgSan Diego .NET User Groupwww.sandiegodotnet.comSan Diego SQL Server User Groupwww.sdsqlug.org

Win Free Software!RulesProvide your business card (or email and name)*Indicate on the back what software you are interested inOtherwise 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)PrizesCodeRush and Refactor Pro from DevExpress (4)SecondCopy (automatic backup software) (5) *CodeIt.Right Standard from SubMain (4)*Requires mailing address and phone number

Exposing your Data over the wire (internet)Service Layer

User ExperienceSecurityActive Directory, Card Space, Windows Identity FoundationUI ComponentsWindows Forms, Windows Presentation Foundation, ASP.NET (AJAX, MVC), Silverlight, Windows MobilePresentation LayerLocal Storage/ CacheCommunications LayerWindows Communication Foundation (WCF), WCF Data Services, Web Services, Sync Services, Azure (Cloud), RIA Services, Workflow ServicesBusiness LayerBusiness EntitiesT4 TemplatesBusiness ComponentsBusiness WorkflowWindows Workflow FoundationData LayerEntity Framework, LINQ to SQL, DataSetsSQL Server

SOAP IssuesComplexSlowHeavyweightTied to development tools and librariesNot supported universallyCross-vendor/platform interoperability NOT perfect

REST == Architectural Stylefor connecting distributed applicationsServer-side resources identified by URIAccess resources over HTTP/ HTTPSReturned data is “plain”: Atom, plain-XML or JSON

What is REST?Representational State TransferAn architectural style developed by Roy FieldingResource based not RPC basedBased on HTTPStandard resource formatsStateless communication between client and serverGET, POST, PUT, DELETEAddressable resources + hyperlinking

XMLXMLJSONJSONHow REST WorksClientServerURLResourcesVERB (GET, POST, PUT, DELETE)Resource 1RepresentationResource 2StatusRepresentation

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

Data Services ClientsHTTP(Open Data Protocol)WCF Data ServicesSQL Server 2008 Reporting ServicesWindows Azure Table Storage

OData SDK – Client Library(March 2010)OData JavaScript LibraryOData SDK for PHPRestlet ext. for JavaOData client lib for WP7OData SDK for ObjCData Services update for .NET 3.5 SP1.NET 4.0Silverlight 4.0

OData ConsumersModern web browsersOData explorerExcel 2010 – PowerPivotLINQPadSesame

Easily Expose Your EntitiesWCF Data Services & OData

WCF Data Services OverviewFramework from Microsoft that that facilitates the creation of RESTful data services via HTTP endpointsShipped with .NET 3.5 SP1Updates for 3.1 SP1 and .NET 4.0Built on top of WCF4Data representation in ATOM or JSON

WCF Data Services OverviewAutomates the exposure of data as RESTful resourcesAnything that implements IQueryable<T> and IUpdatable<T>Entity Framework3rd party ORMsLINQ to SQL, custom data driven CLR classesCustom URI based querying

HTTPOpen Data Protocol (OData)Hosting/HTTP ListenerData Services RuntimeData Access LayerEntityFrameworkCustom LINQ ProviderRelational DatabaseOther Sources

WCF 4Programming ModelCore ServicesWeb HTTP ServicesData ServicesRIA ServicesWorkflow ServicesService ModelData ContractService ContractService BehaviorChannel ModelFormats(Atom, JSON, XML,…)Transports(HTTP, TCP, …)Protocols(SOAP, HTTP, Open Data Protocol,…)

URL ConventionsAddressing entities and setsPresentation options

Service OperationsAdditional way to expose resources via URIs[WebGet] is used for an addressable query[WebInvoke] is used for insert, update, and deleteCan return a scalar valueIEnumerable or IQueryable Astoria’s URI exposes the Service OperationIf you use IQueryable you can append query strings to the URI

Data InterceptorsQuery InterceptorsLogic that will run when a resource is requestedCan be used to limit the data viewed, log, or perform security checkChange InterceptorsLogic that will run when a change (Add/Edit/Delete) request is made

Securing WCF Data ServicesUsing the Host’s authentication modelRole based authorizationEntitySetRightsHiding Sensitive Data[IgnoreProperties]QueryInterceptorsServiceOperations to validate usersBrute force: HTTPS, SSL, IP FilteringSQL Server Security should not be ignored either!

What’s New in .NET 4Data BindingNew 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 dataServer-driven Paging Service can be configured to return requested resources as a set of paged responses

JSON/XMLHTTP/RESTWCF Data ServiceDataServiceContextData BindingHTTP/RESTEntity FrameworkObjectContext availableObjectContext not availableDistributed system – WCF Data serviceSQL Server 2008

What’s New in .NET 4Query ProjectionsQuery results can be modified to include only a subset of properties by using the new $select query option.Custom Data Service ProvidersCan 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 ResourcesThis enables you to retrieve and save binary large object data independent of the entity to which it belongs.

Building nTier Applications with Entity Framework Services (Part 2)

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Building nTier Applications with Entity Framework Services (Part 2)

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