linq in Action学习笔记（实体框架）

最新推荐文章于 2025-03-12 08:56:03 发布

转载最新推荐文章于 2025-03-12 08:56:03 发布 · 111 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/baixingfa/archive/2008/10/12/1309581.html

文章标签：

#c#

本文介绍了ADO.NET Entity Framework（EF）的技术细节，包括如何通过XML文件将物理数据库映射到逻辑模型，以及如何进一步从逻辑模型映射到概念模型。EF使用了多种XML语言来定义这些映射关系。

At the same time that the language teams were designing LINQ, the Microsoft
data teams were working on implementing this conceptual model to handle these

more complex entity structures. They are calling this technology the ADO.NET
Entity Framework (EF). The EF separates the physical from the logical models by
using a series of XML-based mapping files (see figure 8.10).

In the EF, the physical database is mapped to a logical model using a one-toone
relationship between the tables and logical layer entities. The logical entities
are defined through an XML-based Store Schema Definition Language (SSDL)
file. These mappings are similar to those we defined in LINQ to SQL.
The EF moves beyond LINQ to SQL by using another XML-based file (Mapping
Schema Language or MSL) to map the logical model to a conceptual model. The
conceptual model is yet another XML file using a Conceptual Schema Definition
Language (CSDL). These conceptual entities can be further converted into
strongly typed objects if desired.

转载于:https://www.cnblogs.com/baixingfa/archive/2008/10/12/1309581.html