entity framework 6 0

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, we construct our inheritance from DataContext class of DbContext classpublic class datacontext:dbcontext{public DataContext () : Base ("DataContext") { } public

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 EDM, while T-SQL you must use joins to implement relationships. Relational databases do not even have the concept of inheritance; therefore, T-SQL does not support inheritance. Take a closer look at the SQL query string written in the previous section. You will notice that like LINQ to entities, it defines the variable C used for query. In LINQ, it is called a control variable, but in Entity SQL, it is only a variable. Figure 3-

the needs of the database, and data separation is difficult for applications to use. Designing an object model first is a top-down approach. The main advantage of top-down is that applications are almost independent from databases to shape their models. The disadvantage is that sometimes it may not be conducive to the organization of the database, and may also lose performance. Databases are an important part of applications. Therefore, model design and database design should be seamlessly c

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

or view name, stored procedure name, or the parameters they require. You do not need to create the objects used to connect to the database, do not care about the structure of the returned data, and then use the code to convert them into objects. You only need to work with the conceptual model and code model entity classes. When you do this in the scope of EF, when EF is running, it processes database connections, database command generation, query

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[] args) { //Create a gateway inter

Description of Entity notes corresponding to the automatic association query and automatic association update navigation properties of Entity Framework, entityframework I. First, I want to know about the automatic association query of Entity Framework: Automatic association

Http://www.cnblogs.com/sansi/archive/2012/10/18/2729337.htmlProgramming Entity Framework Second Edition translation indexYou can query the Entity Data model using various methods. You choose some methods because of your personal preferences, while others are because you can take advantage of special benefits. You've probably heard LINQ to Entities and

Entity Framework Quick Start -- ModelFirst, entity -- modelfirst Entity Framework not only facilitates operation, but also considers user friendly interaction. The perfect combination of EF4.0 and vs2010 is also a reason for us to choose it. Compared with Nhibernate Microsof

the object to the database and check it again. How does entity framework set a composite primary key? Multiple Primary keys are allowed, as shown below:Using System; using System. componentModel. dataAnnotations; using System. componentModel. dataAnnotations. schema; public class Entity {[Key, Column (Order = 0)] publ

. winGridViewPager1.ColumnNameAlias = CallerFactory The above is my interface operations on the mixed Entity Framework object Framework. I have summarized several analysis scenarios and hope to help you understand the methods of using the Entity Framework in the WCF mode. T

Entity SQL is the SQL class language provided by the Ado.net Entity Framework to support the Entity Data Model (EDM). Entity SQL can be used for object queries and queries executed using the EntityClient provider. L Key Words Value keyword ESQL provides a SELECT value cla

If lazy loading enable = true is not set in the Entity Framework, the handler must handle the loading of the metadata, for example, using load or include, however, because the include parameter number is string, it is very difficult for a person to find the parameter easily after tablename is changed with string, so I want to introduce an extension method. // Adventureworkslt2008r2entities context = new adv

Validate EntityYou can write the custom server side validation for any entity. To accomplish this, override validateentity method of DBContext as shown below.protected OverrideSystem.Data.Entity.Validation.DbEntityValidationResult validateentity (Dbentityentry entityentry, system.collections.generic.idictionaryObject,Object>items) { if(entityentry.entity isStudent) { if(entityentry.currentvalues.getvaluestring> ("Studentname") =="") {

ASP. NET MVC model (Create model class using Entity Framework)-Part.1The purpose of this tutorial is to explain how to use the Microsoft Entity Framework to create a data access class when you create an ASP. NET MVC application. This tutorial assumes that you have no prior knowledge of the Microsoft

The purpose of this tutorial is to explain how to use the Microsoft Entity Framework to create a data access class when you create an ASP. NET MVC application. This tutorial assumes that you have no prior knowledge of the Microsoft Entity Framework. After reading this tutorial, you will understand how to use the

entity by adding the Concurrencycheck property. This allows the Entity Framework to include all the columns in the WHERE clause of the UPDATE statement. Next you will add a rowversion tracking property in the Department entity and create a controller and a view, and finally validate them.to add optimistic concurr

As part of my thesis I measured the performance of some. net orm frameworks including NHibernate and Entity Framework. measuring was done by implementing two simple applications using the same table structure and doing the same operations on the same data. Note: before reading this article please see my views on comparing ORM tools. Also see the follow up post to this comparison for revised results. I measu

The purpose of this tutorial is to explain how to use the Microsoft Entity Framework to create a data access class when you create an ASP. NET MVC application. This tutorial assumes that you have no prior knowledge of the Microsoft Entity Framework. After reading this tutorial, you will understand how to use the