从SQL Server CE切换到SQL Server Express实体问题

Question

My application uses SQL Server Ce for the database and Entity Framework as the ORM. Now I'm trying to switch to SQL Server Express but I'm having trouble doing so.

UPDATE

So after banging my head for 3 hours I finally figured out that you cannot use an Entity model generated from a SQL Server CE database against a SQL Server (in my case Express version).

I used a Diff program to view the generated files (Designer.cs) for both databases and I noticed these differences in the file:

SQL Server CE                          SQL Server 
FK__Download__000000000000003F         FK__Download__PlaneI__0519C6AF 

So I have to create two entity models, but how can I interchange between the two in my program?

If I create two entity models, I'll have two classes with the same object names.

Thanks in advance

Answer 1

The EDMX file actually consists out of three parts.

• CSDL, your conceptual model
• SSDL, the storage model
• MSL, the mapping between those two.

Normally these three parts are embedded in as a resource in your assembly and the connection string that you use tells the runtime to look for them in that assembly.

You can however use physical files and deploy them with your application. In such a way you can use the same CSDL but a different set of SSDL/MSL for the specific database. In that way you can reuse your entity model against both your SqlCE database and a SQL Server database.

Here you can find a blog post about swapping EF metadata