cchapman cchapman - 6 months ago 17
MySQL Question

Is it possible to reference a Foreign Key in a different database in Laravel?

I'm trying to create a model and a migration for that model in Laravel 4.2. All of my Laravel apps use the same MySQL database called

. However, we also have another database (on the same server), called
that contains a
table, which I would like to use for the source of a few foreign keys in my own
table in the

According to the Laravel documentation, I would designate a foreign key with this code:


But I believe this assumes that the
table exists within the same database.

Is it possible to do trans-database foreign keys in Laravel? Would I have to first create a model that uses the
table from
? And is it possible to set up two different database connections in the


Cross database foreign keys hasn't much to do with Laravel actually. The real question is if the database does support it. And MySQL (at least with InnoDB) does support foreign key constraints accross multiple databases. You just have to specify the database with the dot notation: db.table.

Regarding the Laravel schema builder, this should work:

//                                                ^^^^^^^