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What is the entity FrameworkWriting and managing ADO is a tedious and boring task. Microsoft provides an ORM framework called "Entity Framework" for your app to automate the management of your database.Microsoft has given the following definition to the Entity Framework:EF i
This article describes how to use entiity framework to add, delete, modify, and query data in SQL Server. The database used in this article is the previous one.ArticleCreated in model-first development mode. Of course, you also need to download Visual Studio 2010 to open the project file of the previous article. Download link of the project file: Click to download.
Step 1: Modify the database in the first article
In the first article, we used E
add such code in the User entityPublic virtual icollectionin the add such code in the User's constructorThis. Roles = new hashsetSimilarly, the role also contains multiple users, then the add such code to the Role entityPublic virtual icollectionin the add such code to the Role constructorThis. Users = new hashsetNext
Entity Framework mappings to relational Relation Mapping (Entity Framework multi-to-Multi-link ing), entitymapping
Generally, when we design a database, there will be two tables with many-to-many relationships. When the database has many-to-many relationships, we usually process them through intermediate join tables, s
In the RAFY domain Entity Framework, the self-associated entity structure has been specially processed, and this function is explained below. Scene
When you develop a database application, you often encounter scenarios in which you have self-correlating tables. For example, classification information, organizational structure of the Department, folder
that determines the name of the generated object, including the foreign key column in the Model check box When you click Finish, the wizard generates a model with three tables and a view. The wizard reads the FOREIGN KEY constraint from the database and deduces a one-to-many relationship between poet and poem (s), as well as a a-to-many relationship between meter and poem (s). Figure 2-9 Conceptual model Figure 2-9 shows a model that contains table poet,poem and meter, view vwlibrary. Now you
Preface
Before going into the details of the object framework, we will first discuss the convenience of data access from the traditional dataset Method to the object-based method, and how these two methods work differently to lead to the use of O/RM tools like Entity Framework.
Use dataset and datareader as data containers
Let's first look at an example. Su
the name of the generated object, including the foreign key column in the Model check boxWhen you click Finish, the wizard generates a model with three tables and a view. The wizard reads the FOREIGN KEY constraint from the database and deduces a one-to-many relationship between poet and poem (s), as well as a a-to-many relationship between meter and poem (s).Figure 2-9 Conceptual modelFigure 2-9 shows a model that contains table poet,poem and meter, view vwlibrary.Now you have a model that you
(stu );
// Persists to the hard disk
SchoolEntities. SaveChanges ();
}
Console. WriteLine ("OK ");
}
}
The program runs successfully. View the database:
The result is correctly executed.
To sum up, I will first add an entity model, then add an entity class above, and generate a database directly based on the SQL generated by the model, then, you can directly use the ObjectContext generated by ef and the d
Entity Framework learning notes-EF introduction (an article tells you what EF is), entity learning notes
Entity Framework is a data-oriented "Entity Framework" based on ADO. NET ". EF.
In the previous chapters, we have designed a simple domain model, and then we want to be able to implement the domain model persistence and query. In Apworks, a warehousing infrastructure for the entity Framework, NHibernate, and MongoDB is implemented. In this section, I'll show you how to use the Entity Framework-bas
Small instance of the entity Framework: Adding an entity class to the project and inserting1>. Create a console program2>. Add an ADO. NET Entity Data model, select the corresponding database and table (STUDENTMODEL.EDMX)3>. Control Table Code Static voidMain (string[
Apworks Framework practice (6): using the Entity Framework-based warehouse infrastructure, apworksentity
In the previous chapter, we have designed a simple domain model. Next we hope to realize the persistence and query of the domain model. Apworks provides the warehousing infrastructure for Entity
The original purpose of the translation and why choose the Entity Framework 6 Recipes to learn, please see the beginning of this series2-10 Table per Hierarchy inheritance modelingProblemYou have a database table that has a type or identification column. It can tell what the data in the row represents in your application. You want to model using table per hierarchy (TPH) inheritance mapping.Solution Solutio
From the blog Park development team to develop frontline news:In the Entity Framework, if entity A is associated with entity B, you want to load entity B while loading entity a. It is common practice to use include () in LINQ quer
This article is
ADO. NET Entity Framework
Series of articlesArticle 3: continue to demonstrate how to use the entity of ADO. NET Entity Framework as the data source of the data control to easily display data records in the Data Control. ADO. the first two articles of NET
Familiarity with the Entity Framework should be not unfamiliar to the film, he is the ADO Entity Data Model Wizard: You can automatically generate a model class for a database table, or create a model file for code first.However, this Model wizard only displays Microsoft's own SQL Server data source by default, and if
Http://www.cnblogs.com/dudu/archive/2012/04/13/entity_framework_include_where.htmlIn the Entity Framework, if entity A is associated with entity B, you want to load entity B while loading entity a. It is common practice to use inc
Ado. netEntity Framework Overview
The new version of ADO. NET features the New Entity Framework. It allows developers to focus on data through the Object Model (instead of the logical/Relational Data Model. The Entity Framework helps to abstract the logical data architectu
Entity Framework 6.0 supports enumeration/the primary key is reversed after the Entity is added. entityframeworkLab
Go directly to the code and view the result
Entity class
[Flags] public enum FlagsEnum { Day = 1, Night = 2 } public class EntityWi
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