该怎么解决该问题

Question

try{
      while(rs.next()){
         System.out.println(rs.getString("title"));
         System.out.println(rs.getString("author"));
         System.out.println(rs.getString("content"));
        }
    }catch(SQLException e){e.printStackTrace();    }
    catch(NullPointerException e){e.printStackTrace();    }要打印出错误信息，才能查原因。

Answer 1

表里有数据吗？
while(rs.next()){
         System.out.println(rs.getString("title"));
         System.out.println(rs.getString("author"));
         System.out.println(rs.getString("content"));
 }－－》while(rs.next()){
         System.out.println(“next”);  
         System.out.println(rs.getString(1));
         System.out.println(rs.getString(2));
         System.out.println(rs.getString(3));
 }

Answer 2

没有catch(NullPointerException e){e.printStackTrace();    }
出现NullPointerException 在      while(rs.next())这一行

Answer 3

try{
      rs=dbQuery.executeQuery(sql);
    }catch(SQLException e){    }
这一段呢，把exception print出来看看

Answer 4

看看这一段执行完了 rs是否还是null
    try{
      rs=dbQuery.executeQuery(sql);
    }catch(SQLException e){    }