How do I update data in indexedDB?

Question

I have tried to get some information from W3C regarding the update of an objectStore item in a indexedDB database, but with not so much susccess. I found here a way to do it, bu

Answer 1

A bit late for an answer, but possible it helps others. I still stumbled -as i guess- over the same problem, but it's very simple:

If you want to INSERT or UPDATE records you use objectStore.put(object) (help)
If you only want to INSERT records you use objectStore.add(object) (help)

So if you use add(object), and a record key still exists in DB, it will not overwritten and fires error 0 "ConstraintError: Key already exists in the object store".

If you use put(object), it will be overwritten.