What's on the Minecraft CD for PS3? Do I need to insert the CD every time before playing the game?

I just purchased a PS3 (Cause PS3's play PSone games and the PS4 doesn't) and I want to get the minecraft game for my PS3 but I'm not sure how that works. Back with PSone the entire game was on the disc, but with the PS3 hooking up to the internet I'm curious whether the minecraft disc has the entire game on it or just an unlock code? Do I need to insert the minecraft disc every time before playing the game? I'm also talking about the standard minecraft game not the new minecraft story.