[bccdee]

Dependency injection frameworks can be a pain, but basic dependency injection (e.g. pass a DB handle to anything that needs the DB) is a must. What's the alternative? Having everyone independently create their own DB connections?

[wry_discontent]

It's my preference to a point. I think you can over-do it. I've worked in systems that didn't use it and worked just fine. I would bet most folks err on the side of too little, unless they have some kind of framework doing the heavy lifting.