使用EntityFramework，代码优先（CTP5），如何创建数据库？

Question

Background: I have LINQ-to-SQL code and all my objects are POCO (plain old CLR objects) that use attributes/data annotations. I have no mapping files. I am migrating to Entity Framework and would like to use "Code-First" to also generate my database from my domain model (in code). I have no .edmx, no .ssdl, etc. type meta files.

I'm looking for the LINQ-to-SQL equivalent of something like this:

DataContext context = new DataContext(connString)
context.GetTable<MyEntity>();
context.CreateDatabase();

Someone asked a similar question here Does the Entity Framework have an equivalent of DataContext.GetTable<TEntity> from Linq2Sql (ObjectContext.CreateQuery<T>?)

so my code now looks like this:

ObjectContext oContext = new ObjectContext(connectionString);
if (oContext.DatabaseExists()) oContext.DeleteDatabase();
oContext.CreateQuery<StockOrder>(typeof(StockOrder).Name);
oContext.CreateDatabase();

The problem I am facing now is -- my connection string has to be an "EntityConnectionString", which is different(!) than my current LINQ-2-SQL connection string I am using. I feel like I'm going down the wrong path.

Is this even the way to do it? Or maybe EF4 just doesn't support this yet? I hope I'm wrong, otherwise, I will be (like others) severely disappointed with EF4.

Thanks Ray

Answer 1

Use the EntityConnectionStringBuilder class to create a correct connection.
The code will look like the following:

EntityConnectionStringBuilder escb = new EntityConnectionStringBuilder();
escb.Provider = "System.Data.SqlClient";  
escb.ProviderConnectionString = connString;  
escb.Metadata = "Model1.csdl|Model1.ssdl|Model1.msl"; //set the correct metadata path here  
connString = escb.ToString(); //Here is the correct connection string

Here is a Code First sample:

  class Program {  
    static void Main(string[] args) {  

      DbDatabase.DefaultConnectionFactory = new System.Data.Entity.Database.SqlConnectionFactory("Data Source=.;Integrated Security=SSPI");  
      DbDatabase.SetInitializer<StockContext>(new DropCreateDatabaseIfModelChanges<StockContext>());  
      StockContext oContext = new StockContext();  
      oContext.StockOrders.Add(new StockOrder{ StockOrderID = 2, Name = "test"});  
      oContext.SaveChanges();  
    }  
  }  

  public class StockOrder {  

    public int StockOrderID { get; set; }  
    public string Name { get; set; }  
  }  

  public class StockContext : DbContext {  

    public DbSet<StockOrder> StockOrders { get; set; }  
  }