实体约束“检查”代码优先

Question

I made a table to associate a store with Table1 OR Table2 (and other infos)

Id
IdStore_FK
IdTable1_FK
IdTable2_FK
SomeOtherFieldsThatDoesntMatterRightNow

And I created a check constraint to make sure that it will NEVER have both FK's filled at the same time, and only one of them must be filled (XOR):

ALTER TABLE TABLE0 ADD CHECK ((IdTable1_FK IS NULL AND IdTable2_FK IS NOT NULL) OR (IdTable1_FK IS NOT NULL AND IdTable2_FK IS NULL))

But I ran that alter table manually after my add-migration and update-database . I need to develop those restrictions with code-only, to be able to send to my manager.

How can I tell entity framework to create that using only my code?
Is there any DataAnnotation to do that?

I tried to add modelBuilder.Sql("ALTER TABLE XXX....") inside the method Up of an specific migration. I can only add that line to the migration file after the add-migration , which creates the file.

A seed query after every startup checking if the constraint exists, and creating it if don't does not seems cool to me. Also it'll run only if I run the code, and not with the migration/update-database.

Answer 1

There is no way to do it using just code. However, you can leverage the EF migration process to run arbitrary SQL . You can also run sql during the database initialization in case you need to start with a fresh database.

That being said, a custom validation attribute might still be a good idea so that you can catch errors earlier.

Sorry for the meta answer, but these are resources that have helped me in the past.