Change the Rules
Distributed data apps with
.NET
Zlatko Knezevic
Developer Evangelist
Microsoft
zlatko.knezevic@microsoft.com
Data options in .NET world
Some history included
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Native interfaces
ODBC as a abstraction layer
OLE DB
ADO.NET as a wrapper with .NET
– With factories in 2.0 world
• ORMs as of 3.0
Today, things are different
• Client-server is a past paradigm
• Services talking to one another
• Distribution of data, applications,
infrastructure
• TDD/DDD/BDD as a development practice
Visual Studio
Entity Framework
ADO.NET
SQL
Azure
SQL
Server
“Quadrant”
Data Services
“M”/EDM
SQL Server
Modeling
Services
…
Change the Rules
ENTITY FRAMEWORK 4.0
Entity Framework 1.0 had too
many pain points
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The designer!
Model First not supported
Poor support for Stored Procedures
No Pluralization/Singularization
Foreign Keys hidden
Lazy Loading not supported
Missing LINQ Operators vs LINQ to SQL
Generated SQL unreadable
No support for Plain Old CLR Objects
N-Tier difficult
New in Entity Framework 4
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Model-first development
Automatic pluralization
Foreign keys in models
POCO class support (Add-in)
Lazy loading
T4 Code Generation
Template customization
IObjectSet
Virtual SaveChanges
ObjectStateManager control
• Self-tracking entities
• SQL generation
improvements
• More LINQ operator support
• LINQ extensibility
• ExecuteStoreQuery
• ExecuteStoreCommand
• SPROC import
improvements
• Model defined functions
• WPF designer integration
• Code-First development
(Feature CTP)
Better Tools and Design Experience
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Model First
Templated code generation
Stored Procedures
Pluralization/Singularization
Complex Types
Better delete and search
More powerful/flexible runtime
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Deferred Loading (aka lazy loading)
Foreign Keys surfaced
More complete LINQ implementation
ExecuteStoreQuery
EntityFunctions and SqlFunctions
Improvements to generated SQL
Persistence Ignorance
• First class support for Persistence
Ignorance
• No modifications to your classes!
N-Tier
• Self Tracking Entities
Code Only database modelling
• All above is nice, but you still need the
edmx file
• What if you want the code to be “the
truth”?
• Code-only modelling means just that
• Currently only in CTP
Change the Rules
DEMO
Change the Rules
ODATA (WCF DATA SERVICES)
oData?
• What is it?
• Why should we care?
• How are we supposed to use it?
A little bit of history…
• MIX07 was a birthplace of “Astoria”
• Later renamed ADO.NET Data Services
• Requirements for web data services
– Plain HTTP
– Uniform patterns
– Focus on data
– Abstract
Basic idea
The basic idea is simple
You already have this HUGE platform and
API thing
Why not build on top of it??
In a way that is friendly and automatic??
REPRESENTATIONAL
STATE
REST
TRANSFER
OData
• Uniform way of representing structured data
– Atom, JSON formats
• Uniform URL conventions
– Navigation, filtering, sorting, paging, etc.
• Uniform operations
– Addressability
– GET, POST, PUT, DELETE always mean the same
Expose
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Any data over HTTP
Through either JSON or XML (Atom)
Your source needs to be IQueryable<T>
Works like a charm for Entity Framework
contexts
Data
HTTP Source Options
traffic
Custom providers:
- IDataServiceMetadataProvider
- IDataServiceQueryProvider
Data Services Runtime
Updates:
- IDataServiceUpdateProvider
Entity Framework
Provider
Reflection
Provider
Entity Framework
.NET Classes
[+ LINQ provider]
Database
Data
Source
Custom Provider
Data
Source
Special features:
- IDataServiceStreamProvider
- IDataServicePagingProvider
Consume
• Data on any platform
• Bindings and POC code for
– PHP
– Java
– JavaScript
• Client libraries for .NET
• Power Pivot and other means
service interface
business logic
store
oData point: SharePoint 2010
• SharePoint needed 2 things in this space
• Flexible data interface
– Maximize reach, minimum barrier of entry
– Data centric, but enforcing business logic
• Developer story
– Libraries for as many clients as possible
– Great Visual Studio integration
oData consumer: PowerPivot
• “Self-service business intelligence”
– Let people find and use their own data
– …but where’s the data?
• Broad direct database access is impractical
– OData feeds expose data over application logic
– PowerPivot can handle OData natively
• Reports often represent the best data sources
– All reports in Reporting Services are now OData feeds
http://odata.org/producers
Servers
• WCF Data Services
• SharePoint 2010
• SQL Server Reporting Services 2008 R2
• SQL Azure
• IBM WebSphere eXtreme Scale
• Microsoft Media Room
• WCF RIA Services
Services
• Netflix
• Mix 2010
• Nerd Dinner
• Vancouver’s vanGuide
• Open Government Data Initiative
• Open Science Data Initiative
• Microsoft Codename “Dallas”
• City of Edmonton
http://odata.org/consumers
Clients
• Excel + PowerPivot
• LINQPad
• OData Explorer
Client libraries
• .NET
• Silverlight
• Windows Phone 7 Series
• Javascript
• Java
• Objective-C
• PHP
Change the Rules
DEMO
Change the Rules
SQL SERVER 2008 R2
SQL Server 2008 at a glance
• A lot of improvements for next-generation apps
• Beyond rational data types
– Spatial Data type
– Hierarchy data type
• Improvements in rational engine
– FILESTREAM data type
– New DateTime functions
• Support for sparse columns
• Better management
• And a lot more…
SQL Server 2008 R2
• Adding on the solid foundation that is SQL
2008
• Improvements in management, reporting
and federation
• StreamInsight™
• Support for oData in Reporting Services
• Better business insight with new BI
advances
– PowerPivot
Visual Studio 2010 & SQL Server
2008 R2
• Continued “DB professional” support
– Offline database projects
– Provides a place for the DB in ALM cycle
• New T-SQL IDE and developing features
• Data-tier Application projects
Data-tier Applications
• Improved Transact-SQL IDE
• Supports offline development, refactoring,
versioning, policy
• Builds single unit of deployment
containing all database objects (DACPAC)
• Registered with SQL Server when deployed