In this session we will analyze the options we have in order to start using Entity Framework CodeFirst in existing projects where the data access is done in an older fashion.

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

2. Agenda
EF Intro
EF
Demos
Mapping
EF Fluent
API

3. ORM, O/RM, and O/R mapping
Objects Mapping Data

4. 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

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

6. EF <= v4.0 - EDMX Mapping

7. EF >= v4.1 -Code First
Mapping
Data Annotations
Fluent API

8. Code-First development

9. 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)

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

11. 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

12. Demo 1
Northwind database
Convention over Configuration

13. Mappings
Convention over Configuration
Products
table
One-to-many /
Foreign Key
Entity Key /
Primary Key

14. 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

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

16. Fluent API – Primary Keys

17. Fluent API – Properties

18. Fluent API - Types

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

20. Fluent API - Relationships

21. Demo 4
Fluent API
 Configure Table Splitting

22. Fluent API – Table/Entity
splitting

23. Fluent API
Inheritance Table Mapping
/* default mapping strategy */
TPH (Table per Hierarchy)

24. Fluent API
Inheritance Table Mapping
TPT (Table per Type)

25. Fluent API
Inheritance Table Mapping
TPC (Table per Concrete Type)

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

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

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

29. 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

30. Q&A
Applying EF Code First at Your Job

31. 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