Learning Entity Framework(1)

Code First with existing database 创建一个程序 添加一个'ADO.NET Entity Data Model' 在Entity Data Model Wizard中选择'Code First from database' 然后选择已经存在的数据库 确认之后,会在项目中添加一些东西: App.config中会添加一个数据库连接 有一个继承自DbContext的类,使用的App.config中的数据库连接名,包含了所有被添加进来的数据表类型的DbSet<T>属性(

In this article, you will learn about relationships in Entity Framework using the Code First Approach with Fluent API. 在这篇文章中,你将会学习到使用EF Code-First方式和Fluent API来探讨EF中的关系(一对一,一对多,多对多). Introduction[介绍] A relationship, in the context of databases, is a

In this post we will be discussing about change tracking feature of Entity Framework Code First. Change tracking allows Entity framework to keep track of all the changes in entities' data. It might involve adding new entities to entities collection o

source Link Introduction This is the Entity Framework article series. In our previous two articles we learned various approaches to working with Entity Framework and various strategies to handle a database in a code first approach. You can read it he

Since I have spent many years on Windows Application development in my first three years of software career.  I was interested in the C#, had tried to understand the basic knowledge about C#. The programs, the patterns, the object-oriented methodolog

Entity Framework是个好东西,虽然没有Hibernate功能强大,但使用更简便.今天整理一下常见SQL如何用EF来表达,Func形式和Linq形式都会列出来(本人更喜欢Func形式). 1.简单查询: SQL: SELECT * FROM [Clients] WHERE Type=1 AND Deleted=0 ORDER BY ID EF: //Func形式 var clients = ctx.Clients.Where(c => c.Type == 1 && c.D

9-3. 找出Web API中发生了什么变化 问题 想通过基于REST的Web API服务对数据库进行插入,删除和修改对象图,而不必为每个实体类编写单独的更新方法. 此外, 用EF6的Code Frist实现数据访问管理. 本例,我们模拟一个N层场景,用单独的客户端(控制台应用)来调用单独的基于REST服务的Web网站(WEB API应用) . 注意:每层使用单独的Visual Studio 解决方案, 这样更方便配置.调试和模拟一个N层应用. 假设有一个如Figure 9-3所示的旅行社和预订

Entity Framework 学习初级篇1--EF基本概况... 2 Entity Framework 学习初级篇2--ObjectContext.ObjectQuery.ObjectStateEntry.ObjectStateManager类的介绍... 7 Entity Framework 学习初级篇3-- LINQ TOEntities. 10 Entity Framework 学习初级篇4--EntitySQL. 17 Entity Framework 学习初级篇5--ObjectQ

error 0152: No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient' error 0152: No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'. Make sure the pro