Entity Framework. Entity Framework and LINQ to SQL. I’ve always found that developers are very interested in contributing their skills and their time to help others. I’m excited to be part of a Read more >> Write Some Code, Change the World Interested in learning more about Scala? Please join us on Wednesday night at 6 pm. We’ll have an introduction to Scala, demonstrate how sanity can Read more >> Ann Arbor Scala Enthusiasts March 20 — Scala 101: Come for the Collections, Stay for the Functions The Ann Arbor Scala Enthusiasts are on meetup and that allows me to post a poll regarding what folks would like for the March 20 Read more >> Ann Arbor Scala Enthusiasts March 20 meeting Hat tip to Stephen Toub for discussing this with me and helping to describe the solution. At my CodeMash precompiler, I mentioned how the C# Read more >> Async, Exceptions and Library Design I’m here in Crested Butte, Colorado, for the annual Java Posse Roundup.
Why use the Entity Framework? Yeah, why exactly? Danny Simmons wrote a marketing piece about the project he's been working on for so long: "Why use the Entity Framework?
". I don't expect Danny to be unbiased towards his own work, so at first I just ignored it: Microsoft produces these kind of 'use our stuff, it's better than sliced bread'-articles a dozen times a day. However, this particular article seems to be a discussion subject and is supported by non-Microsoft people on other blogs, so it's time to stop ignoring it and start to refute the contents of the article, despite it being marketing. After all, it doesn't look like it's marketing. I've spend the entire last 6 years of my life on something called Object-Relational Mapping, so I think I can comment on Danny's claims a bit. When you're creating a system for a client, that system has to represent functionality which are usable in the reality the client lives in. However, looking at the data tuple's contents, they're just a bunch of strings and other constants. . Getting Started (Entity Framework) Entity Framework Documentation Samples for Visual Studio 2008 -
Quickstart (Entity Framework) [This topic is pre-release documentation and is subject to change in future releases.
Blank topics are included as placeholders.] What You Will Learn The first task in this quickstart shows you how to create the School database, and then use Visual Studio tools to generate model and mapping information based on a 1:1 mapping to tables in the database. In subsequent tasks, you will create a Windows Forms application in Visual Studio, create queries that access data in the School model, bind the query results to display controls to show the results of the queries, and then make updates to objects and persist the changes to the database. You can download the completed Course Manager as both a Visual Basic project and a C# project from the MSDN Code Gallery Web site.
Requirements This quickstart is intended for users who are familiar with Visual Studio development and the .NET Framework, but who are new to the Entity Framework. Microsoft Visual Studio 2010. Data Points: ADO.NET Entity Framework Overview. New information has been added to this article since publication.
Refer to the Editor's Update below. Data Points ADO.NET Entity Framework Overview John Papa Code download available at:DataPoints2007_07.exe(1590 KB) Why use the Entity Framework? There are a number of places where you can read an introduction to the Entity Framework, listen to a podcast about it, or watch a screen cast or video of an interview.
Even with these various resources, though, there are so many different data access technologies out there that it's not uncommon for me to get the question: Why should I use the Entity Framework? Or what differentiates it from other options like just using ADO.Net SqlClient and friends, LINQ to SQL or something like nHibernate? I like the second question better, because the truth is that different problems merit different solutions. So here's just a quick take on my perspective about these: Entity Framework vs. traditional ADO.NetAll of the standard ORM arguments apply here. Entity Framework vs. Next there is the fact that LINQ to SQL provides very limited mapping capabilities. You can apply a variety of inheritance strategies: Assume you have an inheritance model with animal, dog:animal & cat:animal. Entity Framework: The Cribsheet.
For things you need to know rather than the things you want to know Prasanna Amirthalingam provides an overview of Entity Framework and how it can be used.
He shows that it can provide an excellent interface between the Object-oriented model and the relational. The Entity Framework allows developers to work with data in the form of objects and properties without having to concern themselves directly with either the stored procedures or functions of the defined interface, or the underlying database tables and columns where this data is stored. Contents Introduction Database developers and application developers need to model business processes and data differently. Entity Framework POCO (EF4): A Simple Mapping.
The latest EF4 CTP released on November 12th includes updated support for POCO’s (Plain Ol’ CLR Objects).
Although we could use POCO’s in the previous CTP, we still had to create an EDMX artifact to model our entities, thus leading to a bit of duplication. In this post I want to take a look a simple mapping scenario, and how that looks using the new ‘Code Only’ API. By using the code only API I can have complete control over my entities, giving me the most flexibility in my mapping strategies, better testability and extensibility, and ultimately greater maintainability. No generated code. No XML files. Since I am a sports fanatic I am going to use one of my favorite models, the sports team. The Database Table I will start by defining a simple table with 2 columns, Name and ID: CREATE TABLE [dbo].
[ID] [bigint] IDENTITY(1,1) NOT NULL, [Name] [nvarchar](50) NULL, CONSTRAINT [PK_Team] PRIMARY KEY CLUSTERED ([Id] ASC)