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Entity Framework Overview

Entity Framework Overview. Entity Framework. A set of technologies in ADO.NET that support the development of data-oriented software applications A component of the .NET Framework starting with version 3.5

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Entity Framework Overview

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  1. Entity Framework Overview

  2. Entity Framework • A set of technologies in ADO.NET that support the development of data-oriented software applications • A component of the .NET Framework starting with version 3.5 • Enables developers to work with data in the form of domain-specific objects and properties rather than data represented in relational database form

  3. Application Parts • Domain (Conceptual) model • defines the entities and relationships in the system that is being modeled • Logical (Storage) model • normalizes the entities and relationships into tables with foreign key constraints • Physical model • addresses the capabilities of a particular data engine by specifying storage details such as partitioning and indexing.

  4. Example Storage Model

  5. Example Conceptual Model

  6. Entity Framework • The Entity Framework creates the mapping between the conceptual model (objects) and the storage model (data) • expressed in XML-based schemas and defined in files that have corresponding name extensions • Conceptual schema definition language (CSDL) defines the conceptual model. • Store schema definition language (SSDL) defines the storage model • Mapping specification language (MSL) defines the mappings between the storage and conceptual models.

  7. Mapping Between Models

  8. Accessing and Changing Entity Data • The Entity Framework provides the following ways to query a conceptual model and return objects: • LINQ to Entities • Query syntax • Method syntax

  9. Entity Framework Architecture

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