entity framework select

[Entity Framework series] Overview, entityoverview This article describes the history of the EF version, and describes the background and history of a technology. It helps us with the following: To put it bluntly, let's start with the question: EF (or EF 3.5) initial release . NET 3.5 SP1 Visual Studio 2008 SP1 Basic O/RM support using the Database First workflow

Entity Framework 6 Recipes Chinese translation series (11), entityframework For the original intention of translation and why I chose Entity Framework 6 Recipes, see the beginning of this series.Chapter 3 Query The previous chapter shows modeling methods for common database scenarios. This chapter shows you how to quer

Entity Framework 6 Recipes 2nd Edition (11-1), entityrecipes The11ChapterFunction Functions provide a powerful code reuse mechanism, and keep your code concise and easy to understand. They are also the database-Layer Code that EF can use when running. Functions include Rowset Functions, Aggregate Functions, Ranking Functions, and scalar Functions. The function is either determined or uncertain. When a funct

ReasonThe navigation properties of the entity are used in view, but the context of the entity is already disposed of by using the controller, but the entity has deferred Query evaluation nature, so The navigation Property object was not loaded, resulting in the above error.Solution Solution One:How to:explicitly Load related ObjectsDisable the deferred query Eval

The title may have to be criticized and pointed out: Code First advocates the use of object-oriented modeling and then the automatic generation of databases by EF (the advantages and disadvantages are not discussed First, I always look forward to this design method). If you first create a database model and then generate an entity model, you can use the EF template of VS2010 to select all the tables, which

Tags: Post enter menu data form data delete IMA ever arc1. Create an Existing Database CREATE TABLE [dbo].[Blogs] ( [BlogId] INT IDENTITY(1,1) not NULL, [Name] NVARCHAR( $)NULL, [URL] NVARCHAR( $)NULL, CONSTRAINT [pk_dbo. Blogs] PRIMARY KEY CLUSTERED([BlogId] ASC) ); CREATE TABLE [dbo].[Posts] ( [PostID] INT IDENTITY(1,1) not NULL, [Title] NVARCHAR( $)NULL, [Content] NTEXT NULL, [BlogId] INT not NULL, CONSTRAINT [pk_dbo. Posts] PRIMARY KEY CLUSTERE

honor. Just reinstall SQLServer again (fix and install it ), although it said that it cannot coexist with the old version of VS on the same machine, but I installed VS2013.2 again, everything works normally. (If there is any risk, do not follow suit. I am not responsible for all consequences) Sometimes you edit a project, and everything is calm, but when you save, close vs2014, and open vs2014 again to open the project, the "Reference List" in the project will remain in the loading state, after

Create an ASP. NET Core MVC application (3)-Create a MySQL database table based on entity Framework Core (Code first) create a data model class (Poco Class)Under the Models folder, add a user class:namespace myfirstapp.models{public class User {public int ID {get; set;} public string Name {get; set; } public string Email {get; set; } public string Bio {get; set; } }} 1 2 3 4 5

Introduction of Entity Framework learning 2--objectcontext, ObjectQuery, ObjectStateEntry and Objectstatemanager classes This section briefly introduces the more important classes of ObjectContext, ObjectQuery, ObjectStateEntry, and Objectstatemanager in the EF. They are all located under the System.Data.Objects namespace under System.Data.Entity.dll. In subsequent chapters, we often use some of their meth

address was addressed by Address,city,region, Country and PostalCode this several combinations. Below, describe the specific steps to be done: Step one: Generate the Entity model The production of the entity model can be generated directly by the VS visual designer (if not, refer to the basic overview of the Entity Framew