Please drop the habit of using question and exclamation marks in triplets; it makes you seem like a very impatient person, which probably does little for people's willingness to help you.
What is the connection between JavaFX (a GUI framework) and the DB work? A properly structured app should separate both aspects so that GUI code and DB code are never intertwined - there should be at control layer in between. The
MVC pattern would apply to this.