數據庫異常捕獲的正確方式

以唯一約束爲例： 

    try {
           flag = operateMenuMapper.insert(po);
        } catch (Exception e) {
            Throwable cause = e.getCause();
            if(cause instanceof java.sql.SQLIntegrityConstraintViolationException){
                log.info("title 字段違反唯一約束條件");
                return new Result(1,0,"添加的菜單已存在，請勿重複添加！",null);
            }
            e.printStackTrace();
        }