geeks track 2 - ado.net and entity framework best practices - andri yadi

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  • 8/9/2019 Geeks Track 2 - ADO.net and Entity Framework Best Practices - Andri Yadi

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    ENTITY FRAMEWORK V2BEST PRACTICES

    , ,Microsoft Innovation Day 2010 May 11 2010

    ndri Yadi .| [email protected] com, ,CEO DyCode | MVP VSTO

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    :// . / /http itunes com apps movreak

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    Entity FrameworkEntity Framework

    SQL Server 2008

    WCF Data Services WCF Data Services/HTTP REST

    JSONSON

    -Real world Scenario

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    . .Dr EF Codd

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    DELETEDELETE

    SELECTSELECT

    COUNTCOUNT

    LEFTLEFTUNIONUNION /MIN MAX/MIN MAX

    JOINJOIN

    HAVINGHAVINGORDER BYORDER BY

    RIGHTRIGHT

    INSERTINSERT

    WHEREWHERE

    UPDATEUPDATE

    Then we code in SQL

    Then we code in SQL

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    ;SqlCommand oCmd;SqlDataReader oDR

    = .string connString ConfigurationManager

    [" "].ConnectionStrings OracleConnString;ConnectionString

    =SqlConnection conn new( );SqlConnection connString

    ;string selectQuery

    = ;int _returnValue 0

    = ( ) selectQuery SELECT COUNT OrderID from Orders+ = ;where EmployeeID @EmpID

    . ();conn Open= ( , );oCmd new SqlCommand selectQuery conn. . ( , . );oCmd Parameters Add @EmpID SqlDbType Int. [ ]. = ;oCmd Parameters @EmpID Value employeeID= . ();oDR oCmd ExecuteReader

    ( . ())if oDR Read= . ( );_returnValue oDR GetInt32 0

    . ();oDR Close. ();conn Close

    .ADO NET code

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    The Dilemma

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    .ADO NETADO( )1996

    DAO( )1992

    RDO

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    ! !Enough We need ORM

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    O

    bjectR elationalMapping

    Technique for working withrelational tables as if

    they were objects in memory Hide away the complexity of

    the underlying tables andgive a uniform way of

    working with data

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    Why ORM? Development productivity Database independence Database portability

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    Many attempts

    Typed Datasets Objectspaces v1 Objectspaces v2 Microsoft BusinessFramework WinFS

    Linq to SQL NHibernate Will RIP Not Microsoft s

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    .ADO NET EntityFramework

    Microsoft s strategictechnology

    Used in other Microsoft(technologies reporting

    )services . .V2 released with NET 4 0

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    Entity DataModel

    ,Invented in the 1970s by.Dr Peter Chen

    ERM

    Conceptual Layer Mapping Layer

    Storage Layer

    : .Now EDM in ADO NETEntity Framework

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    Entity Framework vs LinqToSQL

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    ET S GO DEEPER ON EF2

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    EDM

    Entity FrameworkEntity Framework

    Conceptual ModelConceptual Model

    Entity FrameworkEntity Framework

    < >IEnumerable T

    EntityDataReader

    LINQ to EntitiesEntity SQL Query

    Command TreeEntity SQL Query

    Entity FrameworkEntity Framework

    EntityDataReaderCommand TreeStorage ModelStorage Model

    Mapping

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    DEMO-Model first

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    Eager Loading

    Structure the initial queryin such a way that all ofthe required objects are

    returned in the initialquery

    from c in.nw Customers. (" ")nclude Orders

    ;select c

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    Explicit Loading

    Explicitly request to load

    the related objects . . ();customer Orders Load

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    Lazy Loading

    Related objects are loadedautomatically for you whenyou access them

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    POCO Support

    Plain Old CLR Object User your own POCO objects

    with no EF attributes Code your POCO classes Code Entity Framework

    Context

    Or use T4 POCO entitygenerator by VS2010

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    Questions onPOCO

    Do I still need an EDM? Yes How is metadata mapped to

    POCO entities?onvention basedmapping , ,Entity Type Property and

    Complex Types names mustmatch those defined by in

    EDM

    /Is deferred lazy loadingsupported? Yes

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    Lazy Loading onPOCO

    -Declare lazy loaded propertyas virtual

    Make sure to enable.ContextOptions LazyLoadingEnabled

    What s under the hood?

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    POCO Changetracking

    -Snapshot based -Proxy based

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    DEMOPOCO

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    DEMO Generate EDM from database

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    &Performancesecurity?

    Connections to database

    .vs amount of data You can work with stored

    procedures You can work with views You can define how the

    .ADO NET Entity Frameworkloads your data to

    Eager Lazy ( )Explicit

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    F V2 IN DISTRIBUTED SYSTEM

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    Entity FrameworkEntity Framework

    SQL Server 2008

    A WCF ServiceA WCF Service

    Distributed system WCF service

    Pr

    oxy

    Pr

    oxy

    Da

    ta

    Bi

    ndi

    ng

    Da

    ta

    Bi

    ndi

    ng

    ObjectContextavailable

    ObjectContext notavailable

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    Entity FrameworkEntity Framework

    SQL Server 2008

    WCF Data Service WCF Data Service/HTTP REST

    Distributed system WCF Dataservice

    /HTTP REST

    Da

    ta

    Se

    rv

    ice

    Co

    nt

    ext

    Da

    ta

    Se

    rv

    ice

    Co

    nt

    ex

    t

    Da

    ta

    Bi

    ndi

    ng

    Da

    ta

    Bi

    ndi

    ng

    ObjectContextavailable

    ObjectContext notavailable

    /SON/SONXMLML

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    , O WHAT S NEW IN EF2?

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    Entityenhancements

    -Foreign keys supported inthe conceptual model

    Testability enhancements < >IObjectSet T and

    < >ObjectSet T Easier to mock data

    context and dataentities for tests

    Lazy loading for relatedobjects Options now for explicit

    or implicit loading

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    Support forpersistence

    ignorant objects

    Persistence ignorant objects POCO objects with no EF

    , .attributes etc Mapped to conceptual modelvia convention

    Change tracking possiblewith generated proxies or

    snapshot

    -Managing types in n tierapplications /Easier to add attach objects

    to a context More control over object

    state

    Issues you should consider You still need the Entity( )Data Model edmx To use objects with WCF

    useProxyDataContractResolver

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    Designerenhancements

    Support for complex types &Singularization

    pluralization

    Model first development Creates DDL for database

    based on your model

    Designer extensibility Influence the EDMX

    generation

    Add visuals Influence DDL creation

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    Code generationcustomization

    Based on T4 templates Included as of VS 2008 ,Runtime support but not

    much design support

    T4 and Entity Framework T4 used to generate code

    from model Create new T4 templates

    to use instead

    Add validation logic Create POCO objects

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    References

    . ADO NET team blog keep up withnew features in Entity

    framework

    :// . . /http blogs msdn com adonet

    . #ADO NET C POCO Entity Generator . #DO NET C Web Site POCO Entity WCF Data Services team blog

    :// . . /http blogs msdn com astoriateam

    http://visualstudiogallery.msdn.microsoft.com/en-us/23df0450-5677-4926-96cc-173d02752313http://visualstudiogallery.msdn.microsoft.com/en-us/23df0450-5677-4926-96cc-173d02752313http://visualstudiogallery.msdn.microsoft.com/en-us/fe568da5-aa1a-4178-a2a5-48813c707a7fhttp://visualstudiogallery.msdn.microsoft.com/en-us/fe568da5-aa1a-4178-a2a5-48813c707a7fhttp://visualstudiogallery.msdn.microsoft.com/en-us/fe568da5-aa1a-4178-a2a5-48813c707a7fhttp://visualstudiogallery.msdn.microsoft.com/en-us/23df0450-5677-4926-96cc-173d02752313
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    DyCode. . .www dycode com | [email protected] comDynamic IT Solutions for Optimal Business

    Value