Entity Framework is being developed as an Open Source product.This list is created based on the most notable features and also from frequently asked questions about Entity Framework. Featuresįollowing are the basic features of Entity Framework. So, you can query against your conceptual model objects and work directly with them. And then Entity Framework will comprehend the conceptual model.Įither way, Entity Framework works out how to move from your conceptual model to your database. You can just define your classes and use a feature of Entity Framework called Code First. You can use a Visual Designer to define your conceptual model, which can then generate the classes you will ultimately use in your application. Your conceptual model may happen to align with your database schema or it may be quite different. It's a model of the objects in your application, not a model of the database you use to persist your application data. ![]() With Entity Framework, the focal point is referred to as a conceptual model. What it is that you want your application to do without being limited by what the database is able to do? Microsoft recommends that you use Entity Framework over ADO.NET or LINQ to SQL for all new development.įor developers who are used to database focused development, the biggest shift with Entity Framework is that it lets you focus on your business domain. Most ORMs typically map domain types directly to the database schema.Įntity Framework has a more granular mapping layer so you can customize mappings, for example, by mapping the single entity to multiple database tables or even multiple entities to a single table.Įntity Framework is Microsoft's recommended data access technology for new applications.ĪDO.NET seems to refer directly to the technology for data sets and data tables.Įntity Framework is where all of the forward moving investment is being made, which has been the case for a number of years already. There are other ORMs in the marketplace such as NHibernate and LLBLGen Pro. If you're querying, you can express your queries against your domain objects using LINQ to entities.Įntity Framework will execute the relevant query in the database and then materialize results into instances of your domain objects for you to work within your app. ![]() NET Framework.Īn ORM takes care of creating database connections and executing commands, as well as taking query results and automatically materializing those results as your application objects.Īn ORM also helps to keep track of changes to those objects, and when instructed, it will also persist those changes back to the database for you.Įntity Framework is an ORM and ORMs are aimed to increase the developer’s productivity by reducing the redundant task of persisting the data used in the applications.Įntity Framework can generate the necessary database commands for reading or writing data in the database and execute them for you. Entity Framework is an Object Relational Mapper (ORM) which is a type of tool that simplifies mapping between objects in your software to the tables and columns of a relational database.Įntity Framework (EF) is an open source ORM framework for ADO.NET which is a part of. NET applications and relational databases. The composite key does not create an identity column for the integer property.Entity Framework - Overview What is Entity Framework?Įntity Framework was first released in 2008, Microsoft's primary means of interacting between. Note: In EF 6, the Key attribute creates a PK with an identity column when applied to a single integer type property. The above code creates composite primary key columns StudentKey and AdmissionNum in the Students table as shown below. You have to use the Fluent API HasKey() function in EF Core. In EF 6, the Key attribute along with the Column attribute can be applied to multiple properties of an entity class which will create composite primary key columns in the database.ĮF Core does not support creating a composite key using the Key attribute. ![]() The Key attribute can be applied to a property of any primitive data type except unsigned integers. This will override the default conventions and create a primary key column StudentKey in the Students table in the database as shown below. Using Īs you can see in the above example, the Key attribute is applied to the StudentKey property of the Student entity class. The Key attribute overrides this default convention. The default convention creates a primary key column for a property whose name is Id or Id. The Key attribute can be applied to a property in an entity class to make it a key property and the corresponding column to a PrimaryKey column in the database. Next Data Annotations - Key Attribute in EF 6 & EF Core
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