Entity Framework Tutorial Basics（3）：Entity Framework Architecture

Entity Framework Architecture

The following figure shows the overall architecture of the Entity Framework. Let us now look at the components of the architecture individually:

EDM (Entity Data Model): EDM consists of three main parts - Conceptual model, Mapping and Storage model.

Conceptual Model: The conceptual model contains the model classes and their relationships. This will be independent from your database table design.

Storage Model: Storage model is the database design model which includes tables, views, stored procedures, and their relationships and keys.

Mapping: Mapping consists of information about how the conceptual model is mapped to the storage model.

LINQ to Entities: LINQ to Entities is a query language used to write queries against the object model. It returns entities, which are defined in the conceptual model. You can use your LINQ skills here.

Entity SQL: Entity SQL is another query language just like LINQ to Entities. However, it is a little more difficult than L2E and the developer will have to learn it separately.

Object Service:Object service is a main entry point for accessing data from the database and to return it back. Object service is responsible for materialization, which is the process of converting data returned from an entity client data provider (next layer) to an entity object structure.

Entity Client Data Provider:The main responsibility of this layer is to convert L2E or Entity SQL queries into a SQL query which is understood by the underlying database. It communicates with the ADO.Net data provider which in turn sends or retrieves data from the database.

ADO.Net Data Provider:This layer communicates with the database using standard ADO.Net.

时间： 2024-10-05 22:40:59

Entity Framework Tutorial Basics（3）：Entity Framework Architecture的相关文章

Entity Framework Tutorial Basics（1）：Introduction

以下系列文章为Entity Framework Turial Basics系列 http://www.entityframeworktutorial.net/EntityFramework5/entity-framework5-introduction.aspx ----------------------------------------------------------------------------------------------------------------------

Entity Framework Tutorial Basics（2）：What is Entity Framework?

What is Entity Framework? Writing and managing ADO.Net code for data access is a tedious and monotonous job. Microsoft has provided an O/RM framework called "Entity Framework" to automate database related activities for your application. Microso

Entity Framework Tutorial Basics（41）：Multiple Diagrams

Multiple Diagrams in Entity Framework 5.0 Visual Studio 2012 provides a facility to split the design time visual representation of the Entity Data Model. This means that you can have multiple diagrams for one Entity Data Model. You can create a new d

Entity Framework Tutorial Basics（40）：Validate Entity

Validate Entity You can write custom server side validation for any entity. To accomplish this, override ValidateEntity method of DBContext as shown below. protected override System.Data.Entity.Validation.DbEntityValidationResult ValidateEntity(DbEnt

Entity Framework Tutorial Basics（4）：Setup Entity Framework Environment

Setup Entity Framework Environment: Entity Framework 5.0 API was distributed in two places, in NuGet package and in .NET framework. The .NET framework 4.0/4.5 included EF core API, whereas EntityFramework.dll via NuGet package included EF 5.0 specifi

Entity Framework Tutorial Basics（37）：Lazy Loading

Lazy Loading: One of the important functions of Entity Framework is lazy loading. Lazy loading means delaying the loading of related data, until you specifically request for it. For example, Student class contains StudentAddress as a complex property

Entity Framework Tutorial Basics（36）：Eager Loading

Eager Loading: Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query. Eager loading is achieved using the Include() method. In the following example, it gets all the students from the dat

Entity Framework Tutorial Basics（42）：Colored Entity

Colored Entity in Entity Framework 5.0 You can change the color of an entity in the designer so that it would be easy to see related groups of entities in the designer from Visual Studio 2012 onwards. To change the color of an entity, select entity i

Entity Framework Tutorial Basics（34）：Table-Valued Function

Table-Valued Function in Entity Framework 5.0 Entity Framework 5.0 supports Table-valued functions of SQL Server. Table-valued functions are similar to stored procedure with one key difference: the result of TVF is composable which means that it can