[bmelton]

To an extent, but I don't know of too much development happening these days that aren't done with some sort of framework (at least for web apps), and I don't know of any frameworks that aren't built to at least support an SQL abstraction layer.

The one big app I have on EC2 isn't 'locked in' to Oracle because we're using Django + Oracle, though in testing it out, there is a non-zero effort to migrate to another database.

That said, you're not entirely wrong either, which is why such abstraction layers exist, and even despite how good many of them are, migrations are still non-trivial.