documentsado.net entity framework devdays

8/6/2019 DocumentsADO.net Entity Framework DevDays

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ADO.NET ENTITYFRAMEWORK

Mike Taulty

Developer & Platform Group

Microsoft UK

[email protected]

http://www.miketaulty.com


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Entity Framework Key Facts

Extension to the ADO.NET Provider Model

Pluggable to support any database

Functionality Abstracts a model from your store schema

Offers Object Relational Mapping/LINQ and ADO.NET

APIs

Status

Coming in Visual Studio 2008 Sp1, Summer 2008

Currently in VS 2008 Sp1 Beta 1

3 previous independent betas


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ADO.NET Entity Framework

SQL Provider Oracle Provider ...

Entity Provider

Conceptual Model

Store Model

Map

ADO.NET API ORM API

Connection

Command

DataReader

ObjectContext

ObjectQuery


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ADO.NET API

Entity Provider

Conceptual Model

Store Model

Map

ORM API


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DEMOProgramming Entity Framework with LINQ


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Key Classes

State

Management

Connectionprovider

Metadata

MSL SSDLCSDL

CRUD


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ADO.NET API ORM API

Entity Provider

Conceptual Model

Store Model

Map


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DEMOManipulating our Conceptual Model


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ORM API

Entity Provider

Conceptual Model

Store Model

Map

ADO.NET API


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EF Providers in Progress

Vendor DB Support

Microsoft SQL Server

Core Lab Oracle, MySQL, PostgreSQL,

SQLite

IBM DB2, Informix DynamicServer

MySQL AB MySQL

Npgsql PostgreSQL

OpenLink Many via OpenLink ODBC or

JDBC

Phoenix SQLite

DataDirect Oracle, Sybase, SQL Server,

DB2

Firebird Firebird


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Resources

New Data Developer Site

http://www.datadeveloper.net

ADO.NET Team Blog http://blogs.msdn.com/adonet

My website

http://www.miketaulty.com ( search Entity )


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ADO.NET ENTITYFRAMEWORK

Mike Taulty

Developer & Platform Group

Microsoft UK

[email protected]

http://www.miketaulty.com


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ADO.NET Today

App CodeApp Code

to r

ADO.NETADO.NET

ProvidersProviders

SQL ServerSQL Server

OracleOracle

......

DataReaderDataReader

to r

OracleOracle

CommandCommand

Exec teExec te

Provider Specific (PL/SQL)Provider Specific (PL/SQL)

SELECT * FROM CUSTOMERSSELECT * FROM CUSTOMERS

to r


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tomer

Conceptual ModelConceptual Model

UK tomer

UKPremi m tomer

MapMap


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Programming with Entity SQL

The EntityClient provides the usual

Connection, Command, DataReader

There is no EntityDataAdapter V1.0 the model is read-only

Entity SQL has some additional constructs to

expose the underlying conceptual model

ANYELEMENT CREATEREF DEREF IS OF KEY MULTISET NAVIGATE OFTYPE

OVERLAPS REF ROW SELECT SET TREAT USING


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DEMOProgramming with Entity SQL


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Mapping Examples ( 1 Splitting )Store

Good Customers

IDFirstName

LastName

Bad Customers

ID

ForeName

Surname

CustomersCustomerId

First

Last

Type

EntitiesMapping

Type=G

Type=B


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Mapping Examples ( 2 TPH )Store

Customer

CustomerId

First

Last

EntitiesMapping

Customers

ID

FirstName

LastName

IsPremium

Overdraft

AccountManager PremiumCustomer

Overdraft

AccountManager

?

* Framework also supports TPT


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Mapping Examples ( 3 View + SPs )Store

UkCustomer

CustomerId

Name

EntitiesMapping

ClientView1

select

c.id, c.name

from

customers c

where

c.country =

UK

p_DeleteUkCustomer

p_UpdateUkCustomer

p_InsertUkCustomer


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DEMOQuerying Different Models with Entity SQL


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Programming withLINQ to Entities

New Data Access ORM API implemented in

assembly

System.Data.Entity.dll

Many Namespaces

System.Data.Entity

System.Data.Objects

...

Object Relational Mapping API can be used withor without LINQ


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DEMOProgramming with LINQ to Entities