programming entity framework code first

context = new Recipe12Context())35 {36 Console.WriteLine("Dealers and Their Cars");37 Console.WriteLine("======================");38 foreach (var dealer in context.Dealers)39 {40 Console.WriteLine("\nDealer: {0}", dealer.Name);41 foreach (var car in dealer.Cars)42 {43 string make = string.Empty;44 if (car is Toyot

contains XML to map entity and data tables. EntityFramework uses four files. The first one is the entity Data Model (EDMX), which is used in the designer. The edmx file produced the other three files at the time of compilation. The first of the other three files is the Conceptualschema definition Language (CSDL) file, which contains the XML definition of the conceptual model. The second is a schemadefiniti

both LINQ to SQL and the Entity Framework are object-relational mapping techniques that contain LINQ functionality. The essential difference between them is that EF does a better job of decoupling the database schema from the type of our query. With EF, the object we're querying is no longer a C # class that exactly corresponds to the database schema, but rather a higher-level abstraction: the

essay content to the database with this self-increment ID (the essay content is stored in a separate database, is associated with the essay by ID field, not self-increment), but there is an error message:1 ' ID ' 2'CNBlogsText.dbo.blog_PostBody'; Column does not allow nulls.View CodeLook at the SQL statements generated by EF:1EXEC sp_executesql N'Insert [dbo]. [Cnblogstext_blog_postbody] ([Text])2VALUES (@0)3 Select[ID]4 from[dbo]. [Cnblogstext_blog_postbody]5 where@ @ROWCOUNT >0and [ID] = sc

Entity Framework 6 Recipes translation Series 3, entityframeworkChapter 2 basis of Object Data Modeling It is very likely that you start to explore the Entity Framework. You may ask "How do we start ?", If this is the case, this chapter is a good start. If not, you have already modeled and feel good about

between models. Therefore, the Entity Framework Model has three active layers: 1. Concept layer (conceptual layer)-a conceptual model that represents data, including entities and relationships. 2. logical layer-describes the data storage model in the database. 3. Mapping layer-establishes a ing between the concept layer and the logic layer model. These three layers allow you to map data from a relational d

Entity Framework 6 Recipes Chinese translation series (19), entityframework For the original intention of translation and why I chose Entity Framework 6 Recipes, see the beginning of this series.3-16 bitwise operations in Filtering Problem 　　You want to use bitwise operations in the filter conditions of the query. Solu

Previous articlesArticleI briefly introduced the concept of Entity Framework and introduced database first and model first instances. Today we will introduce another exciting development method: codeonly! Of course, EF's support for poco (plain old CLR object) is a major feature in ef4.0. It is also a major improvement in EF scalability. This is also a simple demonstration of the operation steps! Let's brie

this article. Although the article was written in EF4 beta1, it is now RC, which is equally effective: Poco in Entity Framework: Part 1-the experience ([translation] poco support in Entity Framework-Part 1-experience) Poco in Entity Fra