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SQL Server Compact Edition and the Entity Framework

Rob SandersReadify

Discover, Master, Influence

INTRODUCTION

SQL Server Compact Edition and the Entity Framework

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The SQL Server Family

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The SQL Server 2008 Family of Products• Enterprise• Standard• Workgroup• Web• Express

• Compact

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Overview: SQL Server Compact Edition

• Relational Database• Part of the SQL Server Family• Runs on:

– Windows Mobile Operating Systems– Windows XP– Windows Server 2003– Windows Vista– Windows Server 2008

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Why would I use Compact Edition?

Benefits:• Great for Disconnected Systems,• Lightweight - low footprint,• Support for T-SQL• Critical Business Reports?

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Why would I use Compact Edition?

• Flat File based• Memory and CPU conscious design• Support for T-SQL, Encryption (but not Stored Procedures)• In-Process • Doesn’t Require a Service (unlike other SQL Server databases)• ODBC/ADO Supported• Also supported by the Sync Framework (SQL Server 2008)

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What’s new in Compact Edition 3.5?

• Synchronization (Sync Framework)• Better integration with SQL Management Studio & Visual Studio Server Explorer• Extended T-SQL support

– CROSS APPLY– CAST– TOP– Identity (Insert)

• Local Transaction Scope (On Desktops)• Unicode support• LINQ to SQL

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Introducing the ADO.Net Entity Framework(EF)

• The goal of EF is to decrease the amount of code and maintenance required for data-oriented applications– Lets you create data access applications by programming against a

conceptual model instead of writing directly against a database schema

– Applications are freed from hard-coded dependencies on a particular data engine or storage schema.

– ADO.NET Data Services enables data to be exposed as a REST-based data service that can be consumed by Web clients.

• Entity Framework is central to Microsoft’s data access strategy for the .Net Framework

• Shipped with .Net Framework 3.5 Service Pack 1• Underpinned by LINQ to Entities

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The Entity Data Model

• The Entity Data Model is a Entity-Relationship data model which supports advanced features such as:– Abstract classes– Property / Entity renaming– Inheritance– Complex Types– Stored procedure mapping for insert, update and delete methods.– Mapping a single entity to multiple tables– Hiding join tables in collections– Documentation which populate Xml comments

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Entity SQL

• Write queries independently of the data store with a more concise language– Provides a common query language across providers by extending the existing

SQL language with constructs to work with strong notions of type, inheritance, and relationships from the Entity Data Model

• SQL– SELECT sp.FirstName, sp.LastName, sp.HireDate

FROM SalesPerson spINNER JOIN Employee e ON sp.SalesPersonID = e.EmployeeIDINNER JOIN Contact c ON e.EmployeeID = c.ContactIDWHERE e.SalariedFlag = 1 AND e.HireDate >= '2006-01-01'

• Entity SQL– SELECT sp.FirstName, sp.LastName, sp.HireDate

FROM AdventureWorks.AdventureWorksDB.SalesPeople AS spWHERE e.HireDate >= '2006-01-01‘

• Only used for select statements

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PRACTICAL IMPLEMENTATION

SQL Server Compact Edition and the Entity Framework

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Image: http://www.techpin.com

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How Compact Edition Works with the Entity Framework

Scope of the demonstration:

• Compact Edition integration with Server Explorer and SQL Server Management Studio

• Create a SQL Server Compact Edition Database• Query a Compact Edition database

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How Compact Edition Works with the Entity Framework

[Demo]

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Further Reading

See the full presentation next month at SQL Code Camp in Wagga Wagga

October 11th and 12th 2008

References

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Getting Started with Entity Framework

• Reading– MSDN Library Page

http://msdn.microsoft.com/en-us/library/bb399572.aspx– ADO.NET Team Blog

http://blogs.msdn.com/adonet– MSDN Forum

http://forums.microsoft.com/MSDN/ShowForum.aspx?ForumID=533&SiteID=1 • Resources

– Microsoft .NET Framework 3.5 Service Pack 1 http://www.microsoft.com/downloads/details.aspx?FamilyId=AB99342F-5D1A-413D-8319-81DA479AB0D7

– Microsoft Visual Studio 2008 Service Pack 1http://www.microsoft.com/downloads/details.aspx?familyid=FBEE1648-7106-44A7-9649-6D9F6D58056E

– eSqlBlasthttp://code.msdn.microsoft.com/esql.

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Thank you

Rob SandersReadify

http://www.readify.net

http://www.twitter.com [Username @AusRob]http://rob.sanders.name [Personal Site]http://internationalized.spaces.live.com [Blog]

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