using entity framework

Entity Framework-DB First method, entityframework EF (hereinafter referred to as Entity Framework) has three methods: DataBase First, Model First, and Code First. The following is the Db First method: 1. There are two tables in the database. One is a professional table and the other is a student table. One student can

The problem of Cross-database query of Entity Framework is solved, and the modernization of the blog Park is another step forward. In the previous article,The modernization of the blog Park-automapperWe have encountered an application scenario where the number of fields returned by the database query is less than the attribute of the entity class. By default,

, gradually analyze the establishment and refinement of the domain model, then you can immediately create a database, if the model has been modified, regenerate a SQL file, and then execute once, is very suitable for the new project Ooad stage needs.When entering the OOP stage, because the database has already existed, it can easily switch to the database first mode, the whole process is smooth and natural.Three modes of PK results:CodeFirst: for small or experimental projects, especially as I o

If the user table and the permission table are many-to-many, where the annotation configuration in the user table:Permissions@ManyToMany (cascade = cascadetype.all, fetch = Fetchtype.eager)@JoinTable (name = "User_permission", Joincolumns = @JoinColumn (name = "user_id"), Inversejoincolumns = @JoinColumn (name = "permission_id"))Public listAnnotation configuration in the permissions table:User@ManyToMany (cascade = cascadetype.all, Mappedby = "Permissionlist", Fetch = Fetchtype.lazy)Public listW

If you have been working with the ADO. NET Entity Framework, you have probably been extremely eager to get your hands on the next version that is now part of Visual Studio 2010 and. net 4.0. long referred to as "EF version 2," this version is now called Entity Framework 4 or EF4, to align with. net

, fortunately, the two technologies of. NET are more popular1. Features2. ReflectionAt that time, the main use of characteristics to identify the entity mapping specific database TableName, attributes corresponding to the specific table ColumnName, as well as the main external, whether self-increment, the default value and so on, are identified by the characteristics.The corresponding SQL statement can be generated by reflecting the attributes on the

[Entity Framework series] Overview, entityoverview This article describes the history of the EF version, and describes the background and history of a technology. It helps us with the following: To put it bluntly, let's start with the question: EF (or EF 3.5) initial release . NET 3.5 SP1 Visual Studio 2008 SP1 Basic O/RM support using the Database

In this article, we'll go on to the previous article, "LINQ to SQL and Entity Framework (top)", and continue to use LINQ to SQL and the Entity Framework to practice "Interpreting queries" to learn the key features of these technologies. We are here to focus on the "LINQ" section in LINQ to SQL and the

For more information about the features of Entity Framework 4, see this article. net 4 Entity Framework introduction, one of the most interesting is the support for poco: EF4 provides simple and traditional CLR object (plain old CLR object/POCO) support for entities. Your object can exist independently of EF, which bet

Original Name: Entity Framework 4.1: BASICS (1) original address: http://vincentlauzon.wordpress.com/2011/04/03/entity-framework-4-1-basics-1/ We can see the English tutorial recommended for Entity Framework 4.1. To help you look

Original article name: Entity Framework 4.1: complex types (4) Address: http://vincentlauzon.wordpress.com/2011/04/13/entity-framework-4-1-complex-types-4/ We can see the English tutorial recommended for Entity Framework 4.1. To

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 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

benefits of ease of use, simplicity, and high performance. The advantage of the Entity Framework is that it provides better flexibility for creating mappings between database Schemas and entity classes, and it supports third-party databases in addition to SQL Server through the provider.One very popular improvement of EF 4.0 is that it now supports almost the sa

half the effort. 2. I wrote "Entity Framework 4 in action Reading Notes" last year. It is only a matter of fact that I have not finished writing at the time and personal level. One year later, I wrote a blog post on Entity Framework to share my experience in learning and using