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Entity Framework 4.1/4.33 (transition from 4.0 to 4.1/4.3) Hello everyone, I was busy on the first two Mondays. In the new project, I used Entity Framework 4.3, but it actually transitioned from 4.0. You know, once you get used to a method and want to change it, it's really not easy. I had the courage to make a transi

1. Entity Framework Code First query table or view var provincelist = ctx. Provinces.sqlquery ( " select TOP * from province " foreach (var province in Provincelist) {Console.WriteLine ( " {0}-{1}-{2} " var provincelist = ctx. Database.sqlquery"select TOP Ten provinceno,provincename from province" ); foreach (var in provincelist) {

Stored Procedure is not just a way to plug a complicated and absurd business logic into the database; it also avoids inserting a complicated and absurd storage logic into the application.ProgramAn application layer. It enables applications to be seen as ideal data performance without disclosing the magic of Database Administrators (DBAs. Various temporary tables, nonstandard Report Tables, views, and table functions are hidden behind simple stored procedure calls, forming a public application pr

dbcontextoptionsbuilder(dbcontextoption);6 Appdbcontext _dbcontext =New Appdbcontext (Dbcontextoptionbuilder.usesqlserver (connection). Options);7 public int AddUser () 8 { 9 _dbcontext.users.add (new Users {Name = "ws4 ", email = "[email protected]" }); _dbcontext.savechanges return (); One } Called in ConsoleApp, adding success If I share a bit, you have a bit of help, welcome to praise, but also for your own harvest praise.

The ASP. NET MVC with Entity Framework and CSS is a relatively new book on ASP. NET MVC, EF, and CSS Technology published in 2016, and I will try to translate this book for future reference. However, as my English proficiency is limited, there is a lack of accuracy or error in translation, so please be enthusiastic to put forward valuable suggestions for amendment. This book is a total of 18 chapters, the f

place here.　　Found the portal to generate the migration file, let's find out how to update these changes to the database through code.When using EF Core, we have to write our own DbContext subclasses by inheriting DbContext. In the DbContext class we found a Database property. As shown in the following:　　Then we looked at the Databasefacde class and did not find any functions to perform the migration. With code search, I have a migration () extension method in the Relationaldatabasefacadeextens

The inspiration for this article comes from the Entity Framework of ASP. NET MVC 6, the official project Contoso University fictitious database in Microsoft MSDNThe original link is as follows;Https://docs.microsoft.com/en-us/aspnet/mvc/overview/getting-started/getting-started-with-ef-using-mvc/ Creating-an-entity-

virtualize two navigation properties (Blog.posts and Post.blog). This enables the lazy load feature of the Entity Framework. Lazy loading means that when you try to access the contents of these properties, it is automatically loaded from the database. 3. Create context You can now define a derived context that represents a session of the database so that we query and save the data. We define a context that

, Entityframework.sqlserver "/> The providers sub-node needs to be deleted, referring to the MySQL connector driver, in order to run the program properly. In addition, the default version of the EF installed by the Power Tool is 6.6.0.0, which works in the VS2012 environment, not in the VS2010. NET 4.0 environment, to uninstall it with NuGet, then reinstall it, and then see the version 4.4.0.0. The code for Program.cs is: 1: class Program 2: { 3: void Mai

stringOrderhandle =string. Empty; if(collection["Orderhandle"]!=NULL) {Orderhandle= collection["Orderhandle"];//Fault Classification Processing description } stringHandletype = convert.tostring (collection["alarmhandletypelist"]);//Fault Handling ClassificationApplog.info ("Dispatch ticket parameter information:"+"--personindex:"+personindex+"--businessindex:"+businessindex+"--providerindex:"+providerindex+"--alarmindex:"+alarmindex+"

Mysqlparameter ("@systemstatus", systemstatus); PRAMS[3] = new Mysqlparameter ("@providerindex", Providerindex); PRAMS[4] = new Mysqlparameter ("@alarmindex", aLarmindex); PRAMS[5] = new Mysqlparameter ("@orderlevel", orderlevel); PRAMS[6] = new Mysqlparameter ("@exceptfixtime", 24); PRAMS[7] = new Mysqlparameter ("@fixperson", Fixperson); PRAMS[8] = new Mysqlparameter ("

This document is mainly introduced. NET development of two new technologies,. NET Platform Language Integration query technology-LINQ, and ado.net new data access layer design technology ado.net Entity Framework. Ado. NET's LINQ to entity section is based on LINQ, First introducing LINQ technology for completeness. Preliminary Knowledge LINQ Technology LINQ is a

control is working.Analyze the SQL executed by EF:EXEC sp_executesql N ' Update [dbo]. [People]set [SocialSecurityNumber] = @0where (([PersonId] = @1) and ([socialsecuritynumber] = @2)] ', N ' @0 int,@1 int,@2 int ', @0=123,@1=1,@2=12345678As you can see, EF will also use the column socialsecuritynumber that we want to control concurrently as a filter, so that when the fircontext is saved, the SocialSecuri

checks and uses SQL Server EXPRESS, where we specify the server and database)dataconn" connectionstring= "server= (local);d atabase=mystudent;uid= (login account);p wd= (login password)" Providername= "System.Data.SqlClient"/>(5) Build the project and service for step (6)(6) Right-click the "Controllers" folder, select "Add Controller",When you click OK, a Studentcontroller class is generated under the Con

First, let's briefly review how to use Code First. The first step is to first create an application on the console, and then add the Entity Framework through Nuget. The corresponding configuration will be added to packages. config and App. config at the same time. Step 2: Add a data operation context entity class. Add two constructors and add an object class of P

Reprint to: http://www.cnblogs.com/jaxu/p/3655582.htmlThis article is a note for use with Aspnetpager controls!For Aspnetpager controls, you can view the Yang Tao home page. This is an open custom ASP. Web control that supports a variety of custom data paging methods, is easy to use and powerful, and can be used to save a lot of unnecessary hassle when using this control during site development.Download this page: Aspnetpager745dll.zipThen take a look at how the page data is passed to the contro

This time is relatively blank. You can have time to play with the technology that is very popular. I know about Entity Framework. that's good. You can have time to play. It's really good if you have studied it recently. it reminds me of one sentence: Microsoft is making dummies, but time has made dummies. The purpose of Microsoft's technology is simple, convenient, and easy to use. This is also one of the

! =NULL orderbyexpression.length >0) { foreach(varOrderFieldinchorderbyexpression) { varproperty =typeof(T). GetProperty (Orderfield.propertyname); varPropertyaccess =expression.makememberaccess (parameter, property); varOrderbyexp =Expression.lambda (propertyaccess, parameter); stringOrdername = Orderfield.isdesc?"orderbydescending":" by"; Methodcallexpression Resultexp= Expression.call (typeof(queryabl

Model First is called "Model First". The Model here refers to "ADO. NET Entity Framework Data Model ". At this time, your application does not design related databases. in Visual Studio, we generate databases and Data classes by designing the Data Model. Step 1: First add a simple console application, and then add an ADO. NET object data model to this project. Step 2: select an empty model. Step 3: Add a

Entity Framework provides three methods for loading related entities: lazy loading, eager loading, and explicit loading. First, let's take a look at msdn's definition of three methods for loading objects. Lazy Loading: For this type of loading, related entities are automatically loaded from the data source when you access the navigation attributes. When using this loading type, note that if the obje