A database containing four names:
String names = {"Alice", "Bob", "Dean", "Elvis"};
... but that's probably not what you meant. How about giving a full explanation of what you want and why - then you might get a meaningful answer :)
It's possible. You need to include the mysql JDBC connector jar file as a library - (Preferences, Libraries). For best results re-start Greenfoot. Then just follow an example on the web (Google is your friend).