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[ORM] Entity Framework (1) CodeFirst Quick Start, ormcodefirst Entity Framework is an O/R Mapping solution developed by Microsoft Based on ADO. NET.Object relationship ing (English:Object Relational ing, AbbreviationORMIs a program technology used to convert data of differen
Recently, we have developed a small application that uses SQLite as a database. When we started using dblinq, there was an unsupported problem when we made a LINQ query. Later I saw that Entity Framework (EDM) supports SQLite, so it was converted quickly. Complete development and test on the development machine. Deploy it to the official environment and start to see "The specified storage zone providesProgr
EF is the Microsoft series to correct seedling Red's heavyweight orm framework, powerful, the operation of the database almost without writing SQL, you can write C # code like the operation of the database, especially in support of multi-table association operation is very convenient, but the resulting SQL statement performance is poor, it is not flattering. But the performance has improved after EF6.Dapper
This section focuses on actual operations: 1. Create an MVC3.0 project: 2. Create a database Vote: Because this program is just a Tutorial example, there is no complicated table structure, just to facilitate learning and creating. The database is Vote, with only one Users table. The fields in the table are id (primary key auto-increment column), UsreName (user name), UserPicPath (Avatar), and VoteCount (number of votes ). 3. Open the project created
Enable Entity Framework to support multiple databases Luo chaohui (http://kesalin.cnblogs.com /) This article follows the "signature-non-commercial use-consistency" creation public agreement EF supports SQL Server very well, both code first, model first, and database first, but it is not so friendly to non-Microsoft databases, currently, the only guarant
Tags: MSDN app asp int DEP Lin SDN location produceThis blog will show you how to use the SQL Compact in EF Code first. The SQL Compact is a free relational database launched by Microsoft, and the latest version is the SQL Compact 4.0. Microsoft's development tools vs 2010/sql Server 2008 and subsequent versions do not have SQL Compac 3.5/4.0t database viewing tools. But there's a sqlcetoolbox tool on CodePlex that's pretty good. Kind of like a lite v
Ef4.3 was officially released in February 9. Microsoft's EF team began to work hard in the last year and added an important feature in version 4.3: "database migration ". For the orm framework, the code first function is almost unattractive because few developers use the automatically generated and uncontrollable entity classes, which is not elegant enough. The ORM fram
Recently, we have developed a small application that uses SQLite as a database. When we started using dblinq, there was an unsupported problem when we made a LINQ query. Later I saw that Entity Framework supports SQLite, so it was quickly converted. Complete development and test on the development machine. When deployed to the official environment, the following error occurs: "The specified storage zone pro
corresponding table in the database is automatically created successfully:The next step is to use EF for data access.3.EF integrated into dependency injection.The next thing you need to do is inject the EF-related content into the. NET5 default container to facilitate constructor injection.Modify the Project.json as follows:4. Modify the Controller and Add Views folder.You can then modify the controller and add views.HomeController file:The corresponding view file:\Finally, run the application
. NET Core Entity Framework Core how do you create DbContext and entitydbcontext This article is copyrighted by the blog and the author Wu Shuang. You are welcome to repost it. for reprinting and crawlers, please indicate the original address of the snail bait in the blog garden at http://www.cnblogs.com/tdws/p/5874212.html. I am planning to share a series of practical background architectures of. NET Core
StaticDbcontextoptionsbuilderNewDbcontextoptionsbuilder(dbcontextoption);6Appdbcontext _dbcontext =NewAppdbcontext (Dbcontextoptionbuilder.usesqlserver (connection). Options);7 Public intAddUser ()8 {9_dbcontext.users.add (NewUsers {Name ="Ws4", Email ="[email protected]" });Ten return_dbcontext.savechanges (); One } A}Called in ConsoleApp, adding successIf I share a bit, you have a bit of help, welcome to praise, but also for your own harvest praise
that efdbcontext is injected through the constructor, and this will use the information we have configured in the startup class above. Next, the method getall the attribute tag [HttpGet] above defines the API's request predicate, the route ("GetAll") defines the address of the API, and finally, this address and the route above the controller together to determine the address of this API, In this example, the GetAll method eventually generates an API address of:/api/address/getall Next,
Tags: des style blog http color io os ar forStatement: The database is MySQL, I only to the extent of writing SQL statements (no saving process), C # will be the basic ADO Database Access, LINQ Foundation.This one only does personal study | review function. Novice can refer to, also please master wrong, Thanksgiving.The Entity Framework (abbreviated EF) is a framework
Entity Framework 6 Recipes 2nd Edition (10-1) Translation-> returns an object set in non-Code Frist mode, recipesfrist Stored Procedure Stored Procedures exist in any type of relational database, such as Microsoft SQL Server. stored procedures are some code contained in the database. They usually perform some operations on the data. They can improve the performan
. In addition to this, there are some more elegant and object-oriented methods, such: However, we have written a loop to create a new set to collect all the variables that meet the conditions. What if I use Lambda or LINQ? This section includes the creation of metadata, filtering using two methods, and finally printing to the screen. The first sentence is to create metadata, without detailed explanation, and the second sentence is the writing of the LINQ statement. From X in XXX W
\entitysix\EFLog\LogOutput.txt"/> "false"Type="System.Boolean"/> After running, you can view theOpened connection at the/9/ - -: +: the+ ,:xxSELECT ' Extent2 '. ' id ', ' Extent2 '. ' Code ', ' Extent2 '. ' Name ' from ' Prod_category_vs_prod ' as ' Extent1 ' INNER JOIN ' prod ' As ' Extent2 ' on ' Extent1 '. ' prod_category_id '=' Extent2 '. ' id ' WHERE ' Extent1 '. ' prod_id '=@EntityKeyValue1--EntityKeyValue1:'2'(Type = Int32, isnullable =false)--Executing at the/9/ - -: +: the+ ,:xx--Comp
Create an empty MVC application, in order to use the Entity Framework's class library, the discovery is not normal reference. For example, Insus.net has explicitly cited System.Data.Entity (highlight code), but the class is not referenced correctly when inheriting dbcontext.Go to Microsoft MSDN View Material: Http://msdn.microsoft.com/en-us/library/system.data.entity (v=vs.103). aspxThe MVC application crea
VS introduces the powerful functionality of the Entity Framework, making it possible to quickly build a DB based application. For the Entity Framework This article does not do too much description, is actually Microsoft version of the O-r Mapping. This article only talks abo
When doing projects, we usually have several processing modes for optimistic concurrency1. Tell the user that the data has been changed by someone else. You'll have to start again.2. Cover the data directly, I'm the biggest.3. Use the data of the person.Here's how code first is done.[Table ("Product")][jsonobject (isreference=true)] Public classproduct{[Key] Public intID {Get;Set; } Public stringCode {Get;Set; } PublicDateTime dateCreated {Get;Set; } [Concurrencycheck]//Key PublicDateTime
ASIDE: before sharing this template, I would like to share with you some of the things worth thinking about in a letter written by Philip Su, who has just left Microsoft for 12 years. 1. Choose carbs. eat dessert first 2. Words matter. connotations matter. 3. Listen to understand. Speak to be understood. 4. The team you want to join is the one that's hard to get. 5. Follow great people. Work for great people. His original article is here. If you want
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