No, there aren't. Knives dull over time; even the most durable steel formulations need sharpening eventually. Those ceramic knives are pretty robust, but they too will dull. More importantly, they're extremely brittle; my experience with them is that they chip very quickly and are really unsuitable for anything other than very light use. For your use, they might be ok, but I think you'd end up being annoyed when they break sooner than you want.

I recommend something from the Victorinox Fibrox line to folks like you who just want to cut stuff and not think about knifes. They're very sharp out of the box, quite durable, and will last a long long time before going dull. When they do, they're so cheap (like $25) that you could just get a new one rather than messing around with sharpening.