我想在java中添加库存到我的数量

Question

代码：

try {

        Con = DriverManager.getConnection("jdbc:derby://localhost:1527/Productsdb", "user1", "password");
        DefaultTableModel models = (DefaultTableModel)beveragetable.getModel();
        int rows = beveragetable.getSelectedRow();
        int s = Integer.parseInt(beveragetable.getValueAt(rows, 5).toString());
        int q = Integer.parseInt(addstock.getText());
        beveragetable.setValueAt(s + q, rows, 5);
        {
        JOptionPane.showMessageDialog(null, "Updated");   
        }
       
        JOptionPane.showMessageDialog(this, "Stock Added");
        Con.close();
        Selectbeveragegoods();
    } catch (SQLException e) {
        e.printStackTrace();
    }

我正在尝试更新我的数据库连接，但我不知道如何做