Code-First Entity Framework

Model-View-ViewModelVáclav Dajbych

Microsoft Student Partner

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ObsahCode-First Entity Framework

RelaceSyntaxeAnotaceDemo

Model-View-ViewModelSrovnání s MVCBindingDemo

Entity FrameworkORM

Automatické mapováníTříd na tabulkyVazeb tříd na relace tabulek

ProxySledování změn

Propagace změn do databáze voláním metody

Entity Framework 4.1

announcing

Entity FrameworkCode-First

Databáze

Schéma Třídy

Databáze Třídy

Entity Framework4.1

V současnosti EF 4.1 RCGo-live licenceZa dva týdny RTW

SQL ServerSQL Server Compact 4Oracle

Navigation Property

Navigation Property

var house = (from h in db.Houses select h).First();

var town = house ;.Town

Navigation Property1:1

class Town {

int Id { get; set; }

  string Name { get; set; }

House House { get; set; }

}class House {

int Id { get; set; }

  int Number { get; set; }

Town Town { get; set; }

}

Navigation Property1:N

class Town {

int Id { get; set; }

  string Name { get; set; }

ICollection<House> Houses { get; set; }

}class House {

int Id { get; set; }

  int Number { get; set; }

Town Town { get; set; }

}

Navigation PropertyM:N

class Town {

int Id { get; set; }

  string Name { get; set; }

ICollection<House> Houses { get; set; }

}class House {

int Id { get; set; }

  int Number { get; set; }

ICollection<Town> Towns { get; set; }

}

Datové typy

intint?stringdecimalDateTimeboolbool?bytebyte[]

int, not nullintnvarchar(128)decimal(18,2), not nulldatetimebit, not nullbittinyint, not nullvarbinary(max)

Syntaxe

public class Town {  public int Id { get; set; }  public string Name { get; set; }  public virtual ICollection<House> Houses { get;  set;  }     }class Entity : Town {  public Entity() {...}  public override ICollection<House> Houses {    get {...}    set {...}  }}

Syntaxe

public class Table { public int Id { get; set; } public int? Value1 { get; set; } public string Value2 { get; set; }

public decimal Value3 { get; set; } public decimal? Value4 { get; set; }  public bool Value5 { get; set; }  public bool? Value6 { get; set; }   public byte Value7 { get; set; }          public byte[] Value8 { get; set; }  public DateTime Value9 { get; set; }}

Connection String

public class DemoDb : DbContext {  public DemoDb() : base(@"connection string") {    var initializer =  new DropCreateDatabaseIfModelChanges<DemoDb>();

   Database.SetInitializer(initializer);    Database.CreateIfNotExists();          }  public DbSet<Table> Table { get; set; }}

web.config

<connectionStrings> <add name="DatabaseCS" providerName="System.Data.SqlServerCe.4.0" connectionString="Data Source=db.sdf" /></connectionStrings>

: base("name=DatabaseCS")

Inicializační strategie

DropCreateDatabaseAlwaysDropCreateDatabaseIfModelChangesCreateDatabaseIfNotExistsIgnoreDatabaseSchema

DbContext

DbContextOnModelCreatingShouldValidateEntity ValidateEntity

IDatabaseInitializerSeed

SqlCommand

DbContext.ExecuteSqlCommand( "UPDATE t SET c = {1} WHERE id = {0}", 7, DateTime.Now);

Anotace

[Key] // primary key [NotMapped][MaxLength] // nvarchar(max)[StringLength(40)] // nvarchar(40) [Required]

Entity Framework 4.1

demo

Model-View-Controller

Model

View Controller

Model-View-ViewModel

View

ViewModel

Model

WPFBinding

Každý ovládací prvek má svůj datový kontextJak ovládací prvek tak i datový kontext vyvolávají události, pokud se hodnota změní

INotifyPropertyChangedINotifyCollectionChangedDependencyPropertyObservableCollectionICommand

WPFBinding

Analogie s ASP.NET<Button Content="{Binding Text}" /><Button><%= Text %></Button>

public string Text { get; set; }code behind pro oba případy stejný

Model-View-ViewModel

demo

ObsahCode-First Entity Framework

RelaceSyntaxeAnotaceDemo

Model-View-ViewModelSrovnání s MVCBindingDemo

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