Building nTier Applications with Entity Framework Services (Part 1)

Building nTier Applications with Entity Framework ServicesPart 1

Check Out Your Local User Groups!
San Diego Cloud Computing User Group
www.azureusergroup.com/group/sandiegoazureusergroup
San Diego .NET Developers Group
www.sddotnetdg.org
San Diego .NET User Group
www.sandiegodotnet.com
San Diego SQL Server User Group
www.sdsqlug.org

Win Free Software!
Rules
Provide your business card (or email and name)*
Indicate on the back what software you are interested in
Otherwise I will pick 
Winners will be picked next week
*Yes, most likely I’m going to send you and email about my user group (sddotnetdg.org) and or web site (dotNetTips.com)
Prizes
CodeRush and Refactor Pro from DevExpress (4)
SecondCopy (automatic backup software) (5) *
CodeIt.Right Standard from SubMain (4)
*Requires mailing address and phone number

Agenda

Overview

nTier Architecture Overview
Model to create flexible reusable applications
Only need to modify or add layers instead of rewriting entire applications over

User Experience
Security
Active Directory, Card Space, Windows Identity Foundation
UI Components
Windows Forms, Windows Presentation Foundation, ASP.NET (AJAX, MVC), Silverlight, Windows Mobile
Presentation Layer
Local Storage/ Cache
Communications Layer
Windows Communication Foundation (WCF), WCF Data Services, Web Services, Sync Services, Azure (Cloud), RIA Services, Workflow Services
Business Layer
Business Entities
T4 Templates
Business Components
Business Workflow
Windows Workflow Foundation
Data Layer
Entity Framework, LINQ to SQL, DataSets
SQL Server

Entity Framework

Object Relational Mapping
What is ORM?
Technique for working with relational tables as if they were objects in memory
Intention is to hide away the complexity of the underlying tables and give a uniform way of working with data
Why use ORM?
Productivity
Retain database independence
ObjectsClassesEntities

Object Relational Mapping
It’s nothing new, just new to .NET
There are many ORMs for .NET developers already in existence. E.g.
LLBLGen Pro http://www.llblgen.com/
Nhibernate http://www.hibernate.org/343.html
EntitySpaces http://www.entityspaces.net/Portal/Default.aspx

The Microsoft Entity Data Model
An extended relational model with Entity-Relationship Model concepts
Entity Types
Strong type with Identity
Inheritance
Scalar/Complex properties
EntitySets
Hold instances of Entity Types
Similar to relational tables
Can have multiple Entitysets of the same EntityTypes
Relationships ("Associations")
Named relationships between Entities
0..1:*, 0..1:0..1, 1:1, 1:M, M:N
Navigation may be exposed as NavigationProperties on EntityTypes
AssociationSets
Contains instances of associations
May be queried directly
EntityContainers
Contains EntitySets, AssociationSets
SalesPerson
EmployeeID = 294272LoginID = adamTitle = "Dev Lead"VacationHours = 0…
Manager
1
1
N
Reports
SalesPerson
SalesPerson
EmployeeID = 729742LoginID = peteTitle = "Developer"VacationHours = 0…ExpenseAccount = …CarLicenseNum = ……
SalesPerson
EmployeeID = 729742LoginID = peteTitle = "Developer"VacationHours = 0…ExpenseAccount = …CarLicenseNum = ……
EmployeeID = 729742LoginID = peteTitle = "Developer"VacationHours = 0…ExpenseAccount = true…

EDM & Entity Framework?
The Entity Framework (EF) is an Object Relational Modeling tool leveraging the EDM
Focus on your domain, not how to persist!
EDM is used to describe your model.
Allows different rate of change between database and code!
EF uses a storage model and mapping to enable this.

ADO.NET Entity Framework

EF Providers in Progress

LINQ to Entities – Lots of Topics

Pain Points in v3.5 SP1
Pluralization/ Singularization
Foreign Keys
Model First
Lazy Loading
Additional LINQ Operators
L2S Features & Patterns
SQL Gen Improvements

Fixing the Paint Points in EF1
Advanced/ New Features

Model First
Create your conceptual model first (not from an existing database)
Wizard will allow the creation of sql scripts to create database scripts.
Also will create EDM files
Creates SQL Server, SQL Server Express, SQL Server Compact database scripts.

Lazy Loading
Enables retrieving all related data (without asking for it)
Off by default
Settable on the ContextOptions
Good for doing reporting!
Not great for going across services
Dim ctx As New AdventureWorksLT_DataEntities()
ctx.ContextOptions.LazyLoadingEnabled = True

T4 Templates
Override default EF classes to create…
POCO Entity Generator
Better for going over RESTful service layers
Self-Tracking Entity Generator
Better for server/ client local storage.
Auto generates classes when models change!
Or can be run manually.
Easily modifiable for your own needs
Once you learn the T4 scripting language.

Summary

Conclusion

Resources
ADO.NET Team Blog
http://blogs.msdn.com/adonet/default.aspx
EF Design Blog
blogs.msdn.com/efdesign
Visual Studio Data Blog
http://blogs.msdn.com/vsdata/
dnrTV!
http://shrinkster.com/1734

Resources
Dan Simmons Blog
http://blogs.msdn.com/dsimmons/
MSDN Code Gallery
WCF Data Services Learning Guide:
http://msdn.microsoft.com/en-us/data/bb931106.aspx
WCF Data Services Team Blog
http://blogs.msdn.com/astoriateam/default.aspx

Required Book!
EF4 In Aug 2010

Building nTier Applications with Entity Framework Services (Part 1)

by David McCarter on Jun 26, 2010

Accessibility

Categories

Tags

Upload Details

Usage Rights

1 Embed 3

Statistics

Building nTier Applications with Entity Framework Services (Part 1) — Presentation Transcript