entity framework insert

This essay list:1. Foreign key Column name default convention2, one-to-many relationship3. One-to-one relationship4. Many-to-many relationships5. A one-to-many reflexive relationship6. Many-to-many reflexive relationshipsIn a relational database, it is not always the case that all the tables exist separately, but they are related to each other. There can be a foreign key dependency between two different tables, and a table can have a reflexive relationship (a field in the table refers to a prima

In this article, we'll go on to the previous article, "LINQ to SQL and Entity Framework (top)", and continue to use LINQ to SQL and the Entity Framework to practice "Interpreting queries" to learn the key features of these technologies. We are here to focus on the "LINQ" section in LINQ to SQL and the

Entity Framework 6 Recipes Chinese translation series (36), entityframeworkFor the original intention of translation and why I chose Entity Framework 6 Recipes, see section 6-12 TPC inheritance ing modeling at the beginning of this series. Problem 　　You have two or more tables with data similar architectures. You want

Entity Framework 6 Recipes translation Series 3, entityframeworkChapter 2 basis of Object Data Modeling It is very likely that you start to explore the Entity Framework. You may ask "How do we start ?", If this is the case, this chapter is a good start. If not, you have already modeled and feel good about

When we need to append data in large batches or query massive data at a time, we must note that the efficiency of the ado.net Entity Framework is almost intolerable. In a simple example, we insert about 5 million pieces of data into the database on the daily basis of the Chinese stock market over the years. It usually takes about 2 minutes to use ado.net, but EF,

ADO. NET Entity Framework is Microsoft with ADO. the object relationship correspondence (O/R Mapping) solution developed Based on. NET, known as objectspace, is now included in Visual Studio 2008 Service Pack 1 and.. NET Framework 3.5 Service Pack 1. Directory Introduction Entity

poet through the vwLibraties entity set, we only need one loop. The output is slightly different, because we repeat the poet's name in each poem. In this example, we do not insert poests, poems, and meters through the view vwLibrary. In most databases, views are read-only. In the object framework, we cannot insert (up

Reference page:Http://www.yuanjiaocheng.net/entity/entitytypes.htmlHttp://www.yuanjiaocheng.net/entity/entity-relations.htmlHttp://www.yuanjiaocheng.net/entity/entity-lifecycle.htmlHttp://www.yuanjiaocheng.net/entity/code-first.ht

other operations ). Next, we load the test data Associate and AssoicateSalareies. To execute asynchronous calls, we wrap the LoadData () operation in an Asynchronous Method and insert test data into the database using the newly added SaveChangesAsync () method. Next, we present three different model query methods, each of which relies on the LINQ extension in the object framework, and each of which is incl

What is the entity FrameworkThe Entity framework is an object-relational mapping O/RM framework.The Entity Framework allows developers to manipulate relational data (relational) as if they were the domain object (domain-specific objects). The

ADO. NET Entity Framework is the official ORM solution of Microsoft. Therefore, we can't help but remember the famous ORM solution in. NET Program Design-nhib.pdf from the open source. With the impressive appearance of VS2010, how will the new ADO. NET Entity Framework be presented to everyone? What problems does

1. Installing the Entity FrameworkUse NuGet to install the Entity Framework Package: tools, library Package Manager, and Package Manager console, execute the following statement:Pm> Install-package EntityFramework2. Entity Framework Database Connection ConfigurationAfter the

Entity Framework 4.1/4.3 One (concept) Preface: Hello everyone, I want to die for you. Because I want to write an article on the Entity Framework series, I wrote the preface here. On the one hand, I want to talk about the starting point of my article series, and on the other hand, I want to talk about the writing ideas

Label:There are 3 common actions for a single entity: adding new entities, modifying entities, and deleting entities. 　　1. Add a new entity 　　Entity Framework Code First adds a new entity by calling the Dbset.add () method. using (var ctx = new Portalcontext ()) { var p

. Rewrite the OnModelCreating method in the context object Recipe4Context to configure the HeroId foreign key and type hierarchy. See Code List 6-10; Code List 6-10.Override OnModelCreating Method 1 protected override void OnModelCreating(DbModelBuilder modelBuilder) 2 { 3 base.OnModelCreating(modelBuilder); 4 5 modelBuilder.Entity Principle Code List 6-11 demonstrates getting and inserting Person entities from our model. We create an instance for each derived

Original article name: Entity Framework 4.1: Optimistic Concurrency (6) Address: http://vincentlauzon.wordpress.com/2011/04/17/entity-framework-4-1-optimistic-concurrency-6/We can see the English tutorial recommended for Entity Framework