programming entity framework code first

(orderitem );Person. Order. Add (order );Personrepository = new personrepository ();Personrepository. updateperson (person );Console. Write (person. Order. First (). ID + person. Order. First (). orderitem. First (). Id );}}} Iv. performance problems The excessive use of reflection will degrade the system performance, so pay attention to the scope of use of this update method. Generally, this reflection update is only used in small projects. If it is used in large and medium-sized project

the implementation of complex types Abstract: currently, because EF does not support complex types, therefore, we cannot design the complex types we need in the visual designer in. Therefore, we need to manually modify the entity model to support complex types of attributes. Entity Framework learning Intermediate 2-stored procedure (I) Abstract: This section d

: dbcommandinterceptor {private int _counter = 0; Private ILogger _logger = new Logger (); public override void Readerexecuting (DbCommand command, dbcommandinterceptioncontextThe above code simply overrides the Readerexecuting method, which can return multiple rows of data through a query command. If you want to see elastic connectivity for other query types, you need to override the Nonqueryexecuting and Scalarexecuting methods as you

that the database's e/r The model is completely turned into an object model, so that developers can invoke access with a familiar object-oriented programming language. EF 4.0 supports database first, model first, and code three generation modes, with more people in code first mode.Concepts and theoretical things are not much to say, I am also with questions to f

Entity Framework 6 Recipes Chinese translation series (44), entityframework For the original intention of translation and why I chose Entity Framework 6 Recipes, see the beginning of this series.8-4 Use the value object (Complex Type -- Also called composite Type) attribute in POCO Problem 　　You want to use value objec

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

EF PrinciplesOpen the edmx file in XML, the XML file contains two main parts: Runtime is the class model part, designer is the graphical interface in VSThe main discussion is the runtime section, which is divided into three parts:SSDL Data Model SectionCSDL Conceptual Model SectionC-s Mapping Mapping Rules sectionDrawing demonstrates the correspondence between ORM and EDMXCompletion of SQL generation based on mapping relationships and entity stateThe

EF Entity Framework What is Entity? I believe everyone knows it. When we reconstruct the data center charging system, the layer responsible for data transfer between the three layers. How is the data type defined in a scope. I. What is the 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 t

parameter Name, City, and State to the text box in HtmlHelper. Map the Name attribute to the file box Name, and so on. The WebGrid control is used to display the result set. It is bound to the CustomerVM. MERs list and is used to obtain the query result set. The controller code displayed in code list 4-6 retrieves data from the database, loads the view for the first time, and then clicks the query button t

servicestack. ormlite to meet your needs. Or directly go to ADO. net. To use EF, we recommend that you use the latest stable release version of EF (dbcontext + code first supported ). Then read the two books programming Entity Framework code first and

to get active loading and to filter the loaded entitysets, such as: New DataLoadOptions (); Options. Loadwith ));Active loading in the Entity framework (Eager Loading)In the Entity Framework, if we want an associated entitysets to be actively loaded, you can use the Include method. The

In any framework, database usage is a key because most of the data we use is stored in the database. ASP. net mvc provides excellent support for databases, especially when we are developing, we can use the Entity Framework.CodeCode-first is preferred. The so-called code priority should be discussed with model priority or database priority. Simply put, model fir

Entity Framework learning suggestions and teaching PPT Jin xuliang ========================================================== ======== Entityframework (EF) is a mainstream Data Access Technology on the Microsoft platform. To introduce this technology to students, I made a three-lecture Entity Framework 5.0 teachin

Entity Framework - Data Persistence framework: Entity FrameWork Program through{Object Relational Mapping:ORM(Object Relational Mapping):created a "virtual object database" that can be used in a programming language}interactin

MVC5 Entity Framework Learning (1): Creating an Entity Framework Data modelMVC5 Entity Framework Learning (2): Implementing Basic CRUD FunctionalityMVC5 Entity

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 Entity Framework