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

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