关于JDBC异常

try{
  stat.setString(1,TitleText.getText());
  stat.setString(2,new String(UserPassword.getPassword()));
  pid=stat.executeQuery();

  if(pid.next()){  JOptionPane.showMessageDialog(Employee_Login,"登录成功");
  }else{  JOptionPane.showMessageDialog(Employee_Login,"登录失败");
  System.out.println(e);
  } 这段代码引发异常  但是我不知道是什么意思  看不懂哦。异常太多了  赋值不下来  请帮我看看啊