Question

I’d like to know how to (if possible) associate tables from different databases using entity framework. I have one edmx for my “xyz” database and another for my “abc” I need to associate them using EF. I know how to fix this using FKs, but that’s not what I want, I’d like to be able to do that using the visual editor, not adding, by hand, a FK to my DB.

Here’s a pratical example of what I’d like to accomplish:

Table User – database: abc
Table Message – database: xyz

I’d like to associate User to Message and vice-versa.

Could anyone help me?

Thanks!

Answer 1

You can query them together with Linq-to-Objects, but not with L2S or L2E.

A context is wrapped around 1 Db-connection, you cannot track/update entites from multiple db’s.

A possible workaround is to ‘link’ to one of the Db’s from the other. MS-SQL can do this. To the EF it would appear 1 database.