Java jdbc programming

Hi, I start some seriolsy programming with jdbc in java. Platform si eclipse in Kubuntu. It's very exciting this jdbc and not so hard than many years before.
I wrote seminar for school. It's was much harder what I expected. I hope that asistent will accept it. Otherwise I learning RK and Economics. Economics is bullshit really, because professor writes too many things in just one book.
It' s not good explain too. Too many things are all the same. I have to be patience.