Rooting Xperia Play 2.3.4 without unlocking bootloader

After reading many forums, just came across this site. I may sound outdated, but I want to root my Xperia play. After reading many forums. I am confused. I have an unlocked Xperia Play 2.3.4 build 4.0.2.A.0.42 (not locked to operator). Can I root it with SuperOneClick latest version 2.3.3 ?? I want to root Xperia Play for saving internal space. I don't want to unlock bootloader. Will I lose all my messages, contacts, settings, etc by rooting? Please guide me with links to the software for rooting if possible.