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Discover, Master, InfluenceSlide 1 SQL Server Compact Edition and the Entity Framework Rob Sanders Readify
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INTRODUCTION SQL Server Compact Edition and the Entity Framework Discover, Master, InfluenceSlide 2
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The SQL Server Family Discover, Master, InfluenceSlide 3 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 Discover, Master, InfluenceSlide 4
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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? Discover, Master, InfluenceSlide 5
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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) Discover, Master, InfluenceSlide 6
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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 Discover, Master, InfluenceSlide 7
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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 Discover, Master, InfluenceSlide 8
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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 Discover, Master, InfluenceSlide 9
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.Edmx Files The Entity Data Model uses a.edmx file which consists of 3 sections – Conceptual Schema Definition Language(CSDL) Defines your application’s data objects. – Store Schema Definition Language (SSDL) – Defines the storage layer Defines the layout of your database – Mapping Specification Language (MSL) – Defines the mapping between the conceptual layer and the storage layer. Maps items from the conceptual layer to the storage layer Abstracts the EDM from you – Created by the Designer (or by hand, if you are game) – Managed by the Metadata Workspace at run time – Embedded in your assembly as a resource Entity Connection String specifies the data location – Use EntityConnectionStringBuilder to build a connection string at runtime Discover, Master, InfluenceSlide 10
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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 sp INNER JOIN Employee e ON sp.SalesPersonID = e.EmployeeID INNER JOIN Contact c ON e.EmployeeID = c.ContactID WHERE e.SalariedFlag = 1 AND e.HireDate >= '2006-01-01' Entity SQL – SELECT sp.FirstName, sp.LastName, sp.HireDate FROM AdventureWorks.AdventureWorksDB.SalesPeople AS sp WHERE e.HireDate >= '2006-01-01‘ Only used for select statements Discover, Master, InfluenceSlide 11
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Entity Framework Objects Metadata Workspace – Runtime component which maintains the CSDL, SSDL, MSL and CLR objects. Object State Manager – Maintains object state and identity management for entity type instances and relationship instances – Tracks query results, and provides logic to merge multiple overlapping query results. – It also performs in-memory change tracking when a user inserts, deletes, or modifies objects, and provides the change set for updates. This change set is used by the change processor to persist modifications Object Context – Primary class for interacting with data from a Entity Data Model – Encapsulates a connection to the database, the metadata workspace and the object state manager – Handle this like you would handle a Sql connection – open/close. For windows forms, use one ObjectContext per application instance. For web forms, use one ObjectContext per request – and use the EntityDataSource! Discover, Master, InfluenceSlide 12
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PRACTICAL IMPLEMENTATION SQL Server Compact Edition and the Entity Framework Discover, Master, InfluenceSlide 13 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 Discover, Master, InfluenceSlide 14
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How Compact Edition Works with the Entity Framework [Demo] Discover, Master, InfluenceSlide 15
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Further Reading See the full presentation next month at SQL Code Camp in Wagga Wagga October 11 th and 12 th 2008 References Discover, Master, InfluenceSlide 16
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Getting Started with Entity Framework Reading – MSDN Library Page http://msdn.microsoft.com/en-us/library/bb399572.aspx http://msdn.microsoft.com/en-us/library/bb399572.aspx – ADO.NET Team Blog http://blogs.msdn.com/adonet http://blogs.msdn.com/adonet – MSDN Forum http://forums.microsoft.com/MSDN/ShowForum.aspx?ForumID=533&Site ID=1 http://forums.microsoft.com/MSDN/ShowForum.aspx?ForumID=533&Site ID=1 Resources – Microsoft.NET Framework 3.5 Service Pack 1 http://www.microsoft.com/downloads/details.aspx?FamilyId=AB99342F- 5D1A-413D-8319-81DA479AB0D7 http://www.microsoft.com/downloads/details.aspx?FamilyId=AB99342F- 5D1A-413D-8319-81DA479AB0D7 – Microsoft Visual Studio 2008 Service Pack 1 http://www.microsoft.com/downloads/details.aspx?familyid=FBEE1648- 7106-44A7-9649-6D9F6D58056E http://www.microsoft.com/downloads/details.aspx?familyid=FBEE1648- 7106-44A7-9649-6D9F6D58056E – eSqlBlast http://code.msdn.microsoft.com/esql. http://code.msdn.microsoft.com/esql Discover, Master, InfluenceSlide 17
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Thank you Rob Sanders Readify http://www.readify.net http://www.twitter.com [Username @AusRob] http://www.twitter.com http://rob.sanders.namehttp://rob.sanders.name [Personal Site] http://internationalized.spaces.live.com [Blog] http://internationalized.spaces.live.com Discover, Master, InfluenceSlide 18
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