title: JavaFx combobox from mysql
body: <p>Good Day I am completely new to coding. I am building an app which uses a combobox besides other library items. The problem I am facing is that while attempting to populate combobox items from a Mysql Db the item values get duplicated each time the drop down is clicked. </p>
  
  <p>How I can keep this from happening ? I do understand that my approach itself could be erroneous.</p>
  
  <pre><code>    @FXML
  public void getStation() {
      String sqlStationName = " select * from station ";
  
      try {
          conn = (Connection) DBConnection.connect();
          PreparedStatement pstStn = conn.prepareStatement(sqlStationName);
          ResultSet stnRS = pstStn.executeQuery(sqlStationName);
  
          while (stnRS.next()) {
  
          comboBoxStation.getItems().add(stnRS.getString("stationName"));
  
  
          }
  
          stnRS.close();
          pstStn.close();
          conn.close();
  
      } catch (SQLException ex) {
          System.err.println("ERR" + ex);
      }
  
  }
  </code></pre>