Question: Javafx eventhandler button (onAction) code that sort and displays sorted records in a tableview from database. Javafx code that check if a record (firstname or

Javafx eventhandler button (onAction) code that sort and displays sorted records in a tableview from database.

Javafx code that check if a record (firstname or lastname) already exists in a database table. If yes, displays "This record already exists" if not, insert the record in the database table.

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