Resultset result;
PreparedStatement prep;
String query = "INSERT INTO myRel (data) VALUES (?)";
prep = db.prepareStatement(query ,Statement.RETURN_GENERATED_KEYS);
result = prep.getGeneratedKeys();
if(result.next() && result != null){
System.out.println("Key: " + result.getInt(1));
} else {
System.out.println("No, Nop nada");
}