05 | Data Access with Entity Framework Bruno Terkaly | Technical Evangelist Bret Stateham | Technical Evangelist

Entity Data Models Developer Workflows WCF Data Services Module Overview

Entity Data Models

Object/Relational Mappers (ORMs) Relational DatabaseModel / Classes {;} Object/Relational Mapper

Entity Framework Designer Models Entity Framework Store Schema Definition Language (SSDL) Mapping Specification Language (MSL) Conceptual Schema Definition Language (CSDL) EDMX Relational DatabaseModel / Classes {;}

Entity Framework Architecture Entity Framework Entity Framework Data Providers (SQL Server…) Entity Client (ado.net / Entity SQL) Object Services (DbContext) Relational DatabaseModel / Classes {;}

Get it With NuGet. Got It? Entity Framework 6 is RTM EntityFramework.codeplex.com –Open Source –Nightly Builds –Accept pull requests from the community Installable from NuGet –Release versions –Pre-Release if you choose to include them

Entity Framework Data Providers Microsoft Ships support for –Microsoft SQL Server (Via the EntityFramework NuGet Package) –Microsoft SQL Server Compact Edition (Via the EntityFramework.SqlServerCompact NuGet Package) 3 rd Party Providers –DevArt dotConnect Data Providers (devart.com) Oracle MySQL SQLite others –Firebird (FirebirdSQL.org)

Developer Workflows

Entity Framework Workflows New Database Existing Database Use DesignerWrite Code Database First: Reverse engineer existing database Designer generates model Classes are generated off the model You can update the database You can modify the classes / mapping Model First: Create your model in the designer Database is generated from model Classes are generated from model Can update model Database updates replace old objects Code First: Create your classes in code Mappings are defined in code Database is generated from code Updates are done using “migrations” Code Second: (not an official name) Create your classes in code Use Entity Framework Power Tools Reverse engineer model in designer

Database First New Database Existing Database Use DesignerWrite Code Database First: Reverse engineer existing database Designer generates model Classes are generated off the model You can update the database You can modify the classes / mapping Model First: Create your model in the designer Database is generated from model Classes are generated from model Can update model Database updates replace old objects Code First: Create your classes in code Mappings are defined in code Database is generated from code Updates are done using “migrations” Code Second: (not an official name) Create your classes in code Use Entity Framework Power Tools Reverse engineer model in designer

DEMO Database First Workflow

Code First Workflow New Database Existing Database Use DesignerWrite Code Database First: Reverse engineer existing database Designer generates model Classes are generated off the model You can update the database You can modify the classes / mapping Model First: Create your model in the designer Database is generated from model Classes are generated from model Can update model Database updates replace old objects Code First: Create your classes in code Mappings are defined in code Database is generated from code Updates are done using “migrations” Code Second: (not an official name) Create your classes in code Use Entity Framework Power Tools Reverse engineer model in designer

DEMO Code First Workflow

WCF Data Services

OData Where Art Though? OData is a protocol for creating and consuming data APIs Check it out at OData.orgOData.org Provides a standard way to use REST to expose & consume data

WCF Data Services A convenient way to create OData services Can expose most any model as Odata Entity Framework is a great way to build your models WCF Data Services Available via NuGet –WCF Data Services Server – Microsoft.Data.Services –WCF Data Services Client – Microsoft.Data.Services.Client Access Data using URIs or a Client Library –OData Query String OptionsOData Query String Options

DEMO Creating and Consuming a WCF Data Service

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