Entity Framework Code First to an Existing Database

1. Create an Existing Database

CREATE TABLE [dbo].[Blogs] (
    [BlogId] INT IDENTITY (1, 1) NOT NULL,
    [Name] NVARCHAR (200) NULL,
    [Url]  NVARCHAR (200) NULL,
    CONSTRAINT [PK_dbo.Blogs] PRIMARY KEY CLUSTERED ([BlogId] ASC)
); 

CREATE TABLE [dbo].[Posts] (
    [PostId] INT IDENTITY (1, 1) NOT NULL,
    [Title] NVARCHAR (200) NULL,
    [Content] NTEXT NULL,
    [BlogId] INT NOT NULL,
    CONSTRAINT [PK_dbo.Posts] PRIMARY KEY CLUSTERED ([PostId] ASC),
    CONSTRAINT [FK_dbo.Posts_dbo.Blogs_BlogId] FOREIGN KEY ([BlogId]) REFERENCES [dbo].[Blogs] ([BlogId]) ON DELETE CASCADE
); 

INSERT INTO [dbo].[Blogs] ([Name],[Url])
VALUES (‘The Visual Studio Blog‘, ‘http://blogs.msdn.com/visualstudio/‘) 

INSERT INTO [dbo].[Blogs] ([Name],[Url])
VALUES (‘.NET Framework Blog‘, ‘http://blogs.msdn.com/dotnet/‘)

2. Create the Application

To keep things simple we’re going to build a basic console application that uses Code First to perform data access:

• Open Visual Studio
• File -> New -> Project…
• Select Windows from the left menu and Console Application
• Enter CodeFirstExistingDatabaseSample as the name
• Select OK

3. Reverse Engineer Model

• Project -> Add New Item…
• Select Data from the left menu and then ADO.NET Entity Data Model
• Enter BloggingContext as the name and click OK
• This launches the Entity Data Model Wizard
• Select Code First from Database and click Next
•