This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Word of advice: Use an existing library instead of trying to create your own. There are a number of issue that can introduce hard-to-find bugs that you need to deal with, like synchronization of threads and proper handling of transactions, that it'd save you time to go with a ready-made solution.