Download ADO.NET Data Services] : Working with RESTful Data by John Shaw, Gary Evans PDF

By John Shaw, Gary Evans

Pro ADO.NET facts prone: operating with RESTful Data is geared toward builders drawn to benefiting from the REST–style information companies that ADO.NET information providers (formerly code–named Astoria) presents. The publication indicates the best way to include ADO.NET facts companies right into a wide variety of universal environments, together with BizTalk, Ajax and Silverlight shopper functions. the fabric is meant for pro builders who're pleased with the .NET 3.5 Framework yet are coming to ADO.NET facts providers for the 1st time and wish to appreciate find out how to combine it into their very own purposes and firm options. The ebook is packed complete with broad real–world strategies and workouts, making sure you stroll away with a deep knowing of the way to exploit ADO.NET information companies in your most sensible virtue.

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Statelessness Each HTTP request in data services is stateless, which promotes scalability of a solution. There is some overhead to this because of the repeatable data that must be sent in each request. This problem is combated by caching requests on the client using a data context to avoid repeated requests and smaller payloads to the server. C HA P TER 2 N A D D R E S S I N G R E S T F U L A D O . N E T D A T A S E R V I C E S Getting Started: Setting Up the Environment The first step in creating your first data service is to ensure that you have all the prerequisites that are required for your machine.

Open the Jknpdsej`*_o file and locate the PK@K code section at the start of the class. kjpatp generic type that the service will operate upon. Replace the PK@K with Jknpdsej`Ajpepeao. 3. Now locate the Ejepe]hevaOanre_a function and add the lines _kjbec*OapAjpepuOap=__aoo) Nqha$&(AjpepuOapNecdpo*=hhNa]`% and _kjbec*OapOanre_aKlan]pekj=__aooNqha$&( Oanre_aKlan]pekjNecdpo*=hh%; this is shown in Listing 2-2. Listing 2-2. khha_pekjo*Cajane_7 qoejcOuopai*@]p]*Oanre_ao7 qoejcOuopai*Hejm7 qoejcOuopai*Oanre_aIk`ah*Sa^7 qoejcOuopai*Sa^7 j]iaol]_aJknpdsej`Oanre_a w lq^he__h]ooJknpdsej`6@]p]Oanre_a8Jknpdsej`Ajpepeao: C HA P TER 2 N A D D R E S S I N G R E S T F U L A D O .

These points cause confusion for the consumer of the service. Listing 2-1. kjpajp)Hajcpd6/,, Scoping Information The second reason traditional web services don’t interact well with the Web is that the scope of the request being made to the traditional web service isn’t clear. This is because SOAP methods are constructed using verbs that act upon the resources. Table 2-1 shows some examples of typical web service methods. Table 2-1. Typicial Web Service Methods Method Action capQoan$% Gets a single user ]``Qoan$% Adds a single user `ahapaQoan$% Deletes a user o]raQoan$% Saves a user heopQoano$% Lists users capBhecdp@ap]eho$% Gets flight details ^kkgBhecdp$% Books a flight As you go down the list, it’s increasing difficult to determine the scope of the request being performed.

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