Applying EF Code First at Your Job

Applying EF Code First at Your Job Gabriel ENEA MAXCODE gabriel.enea@maxcode.ro, @dotnet18 26 November 2011 CodeCamp de toamnă la Iași, România

Agenda EF Intro EF Demos Mapping EF Fluent API

ORM, O/RM, and O/R mappingObjects Mapping Data

Entity FrameworkEntity Framework 4.0  part of .NET 4.0 / VS 2010Entity Framework 4.1 / 4.2  Code First supportGetting/Installing via Nuget package

Entity Framework Components Object Services API In- Entity Data memory Model Metadata Entity Client API

EF <= v4.0 - EDMX Mapping

EF >= v4.1 -Code First MappingData Annotations Fluent API

Code-First development

EF Development Approaches Database First Existing Generated Data Database Model (.edmx) Model First Data Model Generated (.edmx) Database Code First Data Model Generated (classes) Database Today’s Demos Existing Generated Data Database Model (classes)

Entity Framework ContextObjectContextDbContext (Code First support)Roles:  tracking changes and managing identities, concurrency, and relationships.

DbContext• Locating entities with key value• Add/Remove/Attach/Query• Modify State• Change Tracking API (current/original values)• Built-in Model-Level Validation and DataAnnotations support• Raw SQL Query/Command Support

Demo 1Northwind databaseConvention over Configuration

MappingsConvention over Configuration Products table One-to-many / Foreign Key Entity Key / Primary Key

Mappings - Fluent APICreate metadata at runtimeAdvanced mapping configurationsDomain classes free of infrastructure code (DataAnnotations attributes, EntityObject)Rules defined within DbContext class (OnModelCreating event)Better support for existing databases

Demo 2Northwind databaseFluent API  Change Primary Key name  Mapping a Complex Type

Fluent API – Primary Keys

Fluent API – Properties

Fluent API - Types

Demo 3Fluent API - Relationships  Configure One-to-Many & Many-to-Many

Fluent API - Relationships

Demo 4Fluent API  Configure Table Splitting

Fluent API – Table/Entitysplitting

Fluent APIInheritance Table Mapping/* default mapping strategy */TPH (Table per Hierarchy)

Fluent APIInheritance Table MappingTPT (Table per Type)

Fluent APIInheritance Table MappingTPC (Table per Concrete Type)

Demo 5 (timeout!?)Northwind databaseCreate EmployeeData validation

Fluent API MappingsKey field(s)RelationshipsAttributesComplex typesInheritanceTable/Column metadataTable SplittingEntity Splitting

SummaryEF overviewEF 4.2 with CodeFirst and DbContextFluent API in actionDemos, EF CodeFirst with existing database

ResourcesEF 4.2 MSDN Library http://msdn.microsoft.com/en- us/library/gg696172(v=VS.103).aspxBook: Programming Entity Framework: Code First, Julia Lerman, Rowan MillerBlogs:  Entity Framework Team: http://blogs.msdn.com/adonet  Morteza Manavi http://weblogs.asp.net/manavi

Q&AApplying EF Code First at Your Job

Please fill the evaluation form Thank you very much! Gabriel ENEA MAXCODE gabriel.enea@maxcode.ro, @dotnet18 26 November 2011 CodeCamp de toamnă la Iași, România

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Applying EF Code First at Your Job

by Enea Gabriel on Dec 05, 2011

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Applying EF Code First at Your Job — Presentation Transcript