Entity FrameworkRowan Miller

DEV-B417

Setting expectationsThis is a level 400 sessionAssumes prior knowledge of data access and EF

For getting started with EFhttp://bit.ly/EFTechEd2014

AgendaWhere are we at?A quick look at EF6, EF6.1 and EF6.1.1

Demos EF6 in action

Where are we going?What’s happening in EF7

Demos EF7 sneak peek

Where are we at?

Versions

Entity Framework 3.5 SP1

Entity Framework 4

Entity Framework 4.1

Entity Framework 4.2

Entity Framework 4.3

Entity Framework 5

Entity Framework 6

Core runtime in .NET FrameworkNewer runtime pieces out-of-band (NuGet)Tooling in Visual Studio

Runtime in .NET FrameworkTooling in Visual Studio

Runtime out-of-band (NuGet)Tooling out-of-band (Microsoft Download Center)Latest version “chained in” to new Visual Studio releases

Entity Framework 6.1

Entity Framework 6.1.1

Entity Framework 7

What was new in EF6From the EF TeamAsynchronous query and saveConnection resiliencyCode-based configurationDatabase command interception/loggingCustom Code First conventionsCode First Insert, update, & delete stored proceduresNested entity typesImproved transaction SupportMultiple contexts per databaseDbModelBuilder.HasDefaultSchemaConfigurable migrations history tableCreating context with an open connectionEnums, spatial and better performance on .NET 4.0Default transaction isolation level changed to READ_COMMITTED_SNAPSHOT

From our contributors23 total contributionsCustom migrations operationsImproved warm up time for large modelsPluggable pluralization & singularization serviceDbModelBuilder.Configurations.AddFromAssemblyDbSet.AddRange/RemoveRange

What was new in EF6.1From the EF Team120+ bug fixesTooling consolidationHandling Transaction.Commit failures[Index] attributePublic mapping APIConfiguring interceptors in web/app.configImproved migrations change detectionFewer database operations during startup

From our contributors17 total contributionsSupport for String.Concat and .ToString in LINQ queries Support for enum HasFlags in LINQ queriesEntity SQL canonical functions for SQL Server Compact Improved support for EF on Mono

What’s coming in EF6.1.1From the EF Team47 bug fixes (and counting)

From our contributors12 total contributions (and counting)DbModelBuilder.Conventions.AddFromAssembly

Demos | EF6 in action

Demo

Implementing soft deletesCommand tree interceptors (EF 6)Custom Code First conventions (EF 6)Model annotations (EF 6.1)Constructible DbUpdateCommandTree (EF 6.1.1)

dbo.Listings

ListingIdTitle DescriptionPriceIsDeleted

Listing

ListingId Title DescriptionPriceIsDeleted

Custom Conventio

n

public class Listing{ public int ListingId { get; set; } public string Title { get; set; } public string Description { get; set; } public int Price { get; set; }}

Model Builde

r

Query Pipeline

Database

var query = from l in db.Listings orderby l.Title select l;

SELECT * FROM dbo.Listings

db.Listings.Remove(listing);db.SaveChanges();

UpdatePipeline

Command Tree

Interceptor

DELETE FROM dbo.Listings …

Command Tree

Interceptor

WHERE IsDeleted = 0

[SoftDelete("IsDeleted")]public class Listing{ public int ListingId { get; set; } public string Title { get; set; } public string Description { get; set; } public int Price { get; set; } public bool IsDeleted { get; set; }}

SoftDeleteProperty: "IsDeleted"

UPDATE dbo.Listings …

Soft Deletes

Demo

Full text searchRaw SQL queries (EF 4)Custom migration operations (EF 6)Public mapping API (EF 6.1)

Demo

Testing without hitting a databaseMockable DbSet<T> (EF 6)

Demo

Enabling logging with recompilingRegistering interceptors in config (EF 6.1)DatabaseLogger (EF 6.1)

Demo

Tooling consolidation

Where are we going?

Entity Framework 7EF6 supported scenariosFull .NET Framework (ASP.NET & traditional desktop applications)Relational databases

EF7 enabling new scenariosNew platforms (Windows Phone, Windows Store, etc.)New data stores (Non-relational)

Challenges with current code baseLong history going back to the WinFS daysExtensive use of older APIs and design patternsHeavy use of APIs not available on all platforms Lots of seldom used code/featuresMonolithic implementationUnintuitive behaviors woven throughout code base

Not optimized for density/devicesHigh memory footprint

Tight coupling to relational concepts

What we are doingLightweight, extensible version of EF Just the commonly used features (and many new features)Built using modern design patternsDbContext and Code First only

Not a micro-O/RMStill supports LINQ, change tracking, unit of work, etc.

Support relational & non-relational storesNot a high level abstraction over all data storesProvide high level services that are useful on all/most storesNon-common concerns handled by provider extensions

Design principlesKeep EF6 patternsOnly break from existing patterns where there is good reason

Pay per playSimpler apps will require fewer resourcesLow memory footprint

ExtensibleSimple high level API over building blocksEasy to replace/extend individual building blocks as needed

Sensible defaults, less magicOnly support magic where it supports long term success

What about EF6 apps?You don’t have to upgradeEF6 is still supportedUpdates to EF6 will continue (we’ve done EF6.1 and EF6.1.1 in parallel with EF7)

Not all EF6 features will be in 7.0.0We don’t expect everyone to be able to upgrade immediately

Upgrade is a key scenarioSame concepts, same patternsSome code changes will be needed

Get involved in EF7Open sourceSee http://bit.ly/EFTechEd2014 for links

Nightly builds now availableSee http://bit.ly/EFTechEd2014 for links

Demos | EF7 sneak peek

Demo

New data stores

Demo

New platforms

DEV-B356 Industrial-Strength Entity Framework

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