data (table name)
dataid PK,
value1,
value2,
value3
data_address (table name)
dataaddressid PK,
dataid - id to errenddataid,
addressid1 - id to en addressid,
addressid2 - id to en addressid,
type
address (table namne)
addressid PK - id to addressid1 or addressid2,
address1,
address2,
name,
zipcode,
city
I have a really hard time trying to map this relations using Entity Framework 5, if some one have an idea or good links I would much appreciate that!
If you are certain that the database's integrity is sound you could just map the tables and create the associations manually in the EF model.
In a database-first mode I fiddled a bit with a simple data model: Parent + Child without FK. The tables were of course imported without association between them. Then I did "Add Association..." on the Parent, like so:
Note: no foreign key property yet. I added it manually in the properties of the association:
And I could run a linq query on Parent.Children.
I think this is the easiest way for you. The edmx design surface gives you some guidance to see which associations you created. You can always add a code generation item to generate a DbContext which is easiser to work with than the default ObjectContext.
来源：https://stackoverflow.com/questions/12581835/map-tables-relationship-from-legacy-database-w-entity-framework-with-only-prima