应用程序开发时的数据库查询错误

Question

如上图所示，提示数据库出错，我查了代码半天也没找到错误，麻烦大家帮忙看下是什么原因，谢谢！
代码如下：

 public List queryBlank() throws Exception {
        int id = 1;
        List bs = new ArrayList();
        try {
            Connection conn=DBUtil.getConnection();
            String sql=" " +
                    "select (body,answer,exp,kwords,difficult,other,update_time) from blank ";
            PreparedStatement pstmt=conn.prepareStatement(sql);             
            ResultSet rs = pstmt.executeQuery(); //????出错行？？
            while (rs.next()) {
                Blank b = new Blank();
                b.setBody(rs.getString("body"));
                b.setAnswer(rs.getString("answer"));
                b.setExplain(rs.getString("exp"));
                b.setKey(rs.getString("kwords"));
                b.setDifficults(rs.getString("difficult"));
                b.setOther(rs.getString("other"));
                b.setUpdate_time(rs.getDate("update_time"));
                bs.add(b);
            }
            return bs;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

Answer 1

你的sql语句好奇怪，我没这么写过，好像不加括号吧？