Messages

Ok. Actually my objective is to allow SQL injection to take place. Any idea how i can write the methods out?
Is there like parameterized queries somewhere in the jar files that i can edit the SQL statement or something?
Been asking my friends about this but all to no valid.

Is there a way for users to just enter a username instead of using email to register?
If the username were to be in some special characters, such as korean or chinese characters, possible?