如果你还没有接触过或者根本不了解什么是Entity Framework,那么请看这里http://www.entityframeworktutorial.net/EntityFramework-Architecture.aspx,其中的一系列文章以非常简单易懂的形式一步步介绍了Entity Framework的一些基本概念和操作方法。一句话,Entity Framework是微软新的数据操作框架,在项目中引入Entity Framework可...
Here, you will learn how entity framework tracks changes on entities during its life time. Entity framework supports automatic change tracking of the loaded entities during the life time of the context. DbChangeTracker class gives you all the information about current entities being tracked by the ...
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After installation, make sure that the appropriate version of EntityFramework.dll is included in the project. Now, you are ready to use Entity Framework in your project. Setting up the database: This tutorial will use sample SchoolDB which has different tables, stored procedures and views. The...
Entities:i) Students ii) Subject ii) Marks Obtained iv) Teacher. Relationship:How the Students have performed on each Subject in terms of Marks allotted by the Teacher. Advantages Of ERD These are enlisted below: Offers a visual representation of the overall structure. ...
Install Entity Framework 点击“许可证接受”对话框中的“我接受”按钮。 这将开始安装。 Accept 安装完成后,请确保项目中包含相应版本的EntityFramework.dll。 Installation 现在,你可以在你的项目中使用Entity Framework。 创建数据库 本教程将使用具有不同表格,存储过程和视图的示例SchoolDB。数据库设计如下: ...
{ }publicvirtualDbSet<Course> Courses {get;set; }publicvirtualDbSet<Standard> Standards {get;set; }publicvirtualDbSet<Student> Students {get;set; }publicvirtualDbSet<StudentAddress> StudentAddresses {get;set; }publicvirtualDbSet<Teacher> Teachers {get;set; } ...
publicDbSet<Tutorial> Tutorials {get;set; } publicDbSet<School> Schools {get;set; } publicDbSet<Teacher> Teachers {get;set; } protectedoverridevoidOnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<User>().Property(u => u.DisplayName).HasColumnName("display_name"); ...
关于EntityFramework数据迁移原理 查询数据库的表"__MigrationHistory",遍历代码库的Migrations文件夹下的所有文件,如果文件不在__MigrationHistory表内,那么就执行迁移。 有了上面的原理之后,我们来看一下如果我们不小心手动删除了一个表,如何在不影响其它表的情况下来恢复你删除的表: ...
[TeacherName]AS[TeacherName],[Project1].[StandardId]AS[StandardId1],CASEWHEN([Project1].[TeacherId]ISNULL)THENCAST(NULLASint)ELSE1ENDAS[C1]FROM(SELECTTOP(1)[Extent1].[StudentID]AS[StudentID],[Extent1].[StudentName]AS[StudentName],[Extent1].[StandardId]AS[StandardId2],[Extent2].[...