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Entity Framework

Entity Framework. MIS 324 Professor Sandvig. Outline. What is Entity Framework Benefits Drawbacks Example. What is Entity Framework. Microsoft’s newest data access technology Visual Studio: Examines database Creates objects that represent data schema LINQ (Language Integrated Query)

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Entity Framework

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  1. Entity Framework MIS 324 Professor Sandvig

  2. Outline • What is Entity Framework • Benefits • Drawbacks • Example

  3. What is Entity Framework • Microsoft’s newest data access technology • Visual Studio: • Examines database • Creates objects that represent data schema • LINQ (Language Integrated Query) • Replaces SQL • Select, sort, filter, etc.

  4. Benefits • Eliminates disconnect between code & database • No sql statements in code • Use intellisense to write query • Automatic table joins • Full CRUD functionality • LINQ works on all data collections • Arrays, lists, dataviews, etc.

  5. Drawbacks • Microsoft propriety technology • LINQ query syntax different than SQL • Better in many ways • Synchronization between database and entity objects • Change database • Rebuild entity objects

  6. Example • Visual Studio: • Create new Dynamic Data Entities Web Site • Add new item: ADO Data Entity Model

  7. Example • Select “Generate from Database” • Select Sql Server database • Express or full version • Note: table relationships MUST be defined in Database Diagram • Wizard creates new Namespace • Contains data objects that match database

  8. Entity Model Designer Window • Note: many-to-many relationship

  9. LINQ • Use LINQ to query against data objects

  10. LINQ Syntax • Vardatatype uses implicit typing • Similar to DataTable

  11. Example • Retail Store Example

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