java.sql.SQLException参数索引超出范围（2＆gt;参数个数，为1）

Question

private void jbx_ItemPopupMenuWillBecomeInvisible(javax.swing.event.PopupMenuEvent evt) {                                                      
       try{
          conn=ShopDb.database();
          con2=ShopDb.database();
        String cth_item=(String) jbx_Item.getSelectedItem();
       comboUpdate(cth_item);

      String quary2="select qunine from stock where itemID = ? ";

     stm2=con2.prepareStatement(quary2);
     stm2.setString(1,cth_item);
     res2=stm2.executeQuery(); 
    if(res2.next()){
  Double fil2= res.getDouble("quninew");

   String valu = Double.toString(fil2);
   txtBill_availailty.setText(valu);
    }


   }catch(SQLException e){
   JOptionPane.showMessageDialog(null,e);
   }



}                        

Answer 1

您正在获取奎宁并从结果集中检索奎宁。先修复它，然后检查问题是否存在，否则提供堆栈跟踪。

Answer 2

你能做到吗

Double fil2= res.getDouble("qunine");

而不是

Double fil2= res.getDouble("quninew");