entity framework data access layer example

need to use the. Include (Entity) method. See the following code, ( ctx = q = t ctx.Teachers.Include( ( teacher ( course If you view the tracing information in SQL Server Profiler, you will find that only one data interaction process is performed, that is, the program obtains all the required data only through one query. In the layered structure, this meth

The Entity Framework 4.1 supports code First programming mode: You can create a model class first, and then dynamically build the database under EF4.1 by configuration.Two scenarios are shown below:1, Code First mode, ASP. NET MVC data access2, traditional mode, first create the database and table, configure the connection string, and then generate the modelSteps

Entity Framework to register object status changes with Entity Framework. This is the detailed implementation of Entity Framework technology. We will not go into the implementation method here: Public void registerchanges 5.

Concept, logic and data model concept of database Tiered architecture development for applications The corresponding relationship between MVC design pattern and four-layer structure Design goals for the persistence layer Data Mapper Schema Mode Disadvantages of JDBC About Hibernate Quick use

This article from: http://www.cnblogs.com/bluedoctor/archive/2011/08/10/2133983.html In general, our ORM framework usesSingle TableOrViewMap to oneEntity classSometimes stored procedures are mapped to object classes. If you do not want to write the stored procedures, how can these complex SQL queries be mapped to object classes? In fact, whether it is a single table, view, or stored procedure,SQL Server Table value functions, Custom SQL queries

Disclaimer: This article focuses onEF5+,Visual Studio 2012 + Spatial Data Type (Spatial Data Types) Is inEF5Introduced in, there are two types of spatial data: Geography(Geographic)-stores elliptical data, suchGPSThe longitude and latitude coordinates; Geometry(Ry)-represents the coordinate system of the Euclidean r

Here, "On-Demand Update" refers to updating only the modified data. For example, when we open the casual editing page in the background of a blog, there is a lot of data that can be modified, but we only changed the casual title, and nothing else was changed, the database only updates the title field, which is updated on demand. Currently, we use a very backwar

Rafy domain Entity Framework released, although there are help documents, many friends still reflect the complexity of learning, hoping to develop a sample program to show how to use the RAFY domain Entity Framework So, this article through the use of Rafy domain Entity

simplicity, we only select the table object. we name the model namespace androidmodel. For example: Here, we have created an object data model. Double-click androiddb. edmx to view the classes corresponding to each table. For example: The Entity Framework automaticall

follow the official document as an example, there are still many places that you do not understand, and errors will occur. The key is that there is no way to handle an error. The exception information cannot be found on Google... Therefore, we strongly urge nbear to add Chinese help documents... The entire solution framework is divided into six layers: Bll logic processing

.Models.UsersContext.To Enable Migrations for MvcApplication1.Models.MovieDBContext, use Enable-migrations-contexttypename MvcApplication1.Models.MovieDBContext.To Enable Migrations for mvcapplication1.purchaserequestentities, use Enable-migrations-contexttypename mvcapplication1.purchaserequestentities. This is because I have performed enable-migrations before and the system prompts me to already exist MvcApplication1 contextThe following folder appears in the project:Opening the Configuati

of the application, making development and maintenance work more complex. We often encounter custom solutions that are split between data structures and the applications that are built. Unfortunately, for each application, the number of custom solutions, the various methods, and the steps required to model the data are all different, causing problems to occur continuously. The entire industry wants a way

read related data for ASP.net MVC application This is the Microsoft Official tutorial Getting started with Entity Framework 6 Code The 5 Series translation, this is eighth: Update related data for ASP.net MVC application Original: Updating Related Data with the

The Entity Framework (EF) accesses the Entity in three different ways. LINQ to Entities Direct access through LINQ to completely separate the program from the database, and LINQ automatically uses the object service for database operations internally Object Service The

//Name = "My Oh Da", A //CompanyID = c.id, - //}; - //EF. Users.add (u); the //Ef.Companies.Add (c); - - varDF = fromUinchEF. Users - whereU.company.name = ="NX" + Selectu; - varFDDF =DF. ToList (); + A varDFE = fromUinchEF. Users atJoin Cinchef.companies on U.companyid equals c.id - whereC.name = ="NX" - Sele

Finally have time to sort out the source of ASP. NET MVC and Entity Framework.Talk less, step into the subject:The following is the model layer of the Administrator information table, is also commonly used by everyone, see the following code should not be unfamiliar,In this model we use the data annotation and validation of ASP. NET MVC, the

It is the most common and most important structure to recognize the hierarchical structure.Three-tier architecture (3-tier architecture)The interface layer (user Interface layer) is primarily for the user's request acceptance, as well as the return of the data, providing the client with access to the application.The bu

1, the entity component is just one of the implementation choices in the EJB layer. Entity components should not be exposed to client software. The Web tier and other EJB client software should never directly access entity components. It should only deal with a session compo

Introduction Since. Net was truly a developer, the word "efficiency" has become a huge numberProgramA hot topic. Whether it is from the Development Mode (Cross Language), the system framework (. NET Framework), or a variety of convenient tools (vs. Net), all reflect its superior. At the same time, on the other hand, whether. Net can be truly competent for enterprise application development is still cont

our Demo: 3. Implement database operations (add, delete, modify, and query) for the BaseRepository class. (1) Add reference When we operate the base class, we need to use the DLL we just created and the DLL that uses the Entity FrameWork to operate the database. Below we add these two references in the database access layer