急!!怎么把是string 类型转换为clob...先谢谢各位大侠.....

                pstmt = conn.prepareStatement(sql2);
     rs = pstmt.executeQuery();
     CLOB clob = null;
     if(rs.next()){
      clob = (CLOB)rs.getClob(1);
      System.out.println(nl.getNewsContent()+"----dao-崩溃.");
     } 
     Writer wr = clob.getCharacterOutputStream();
     wr.write(nl.getNewsContent());
     wr.flush();
     wr.close();
     rs.close();
     conn.commit();
这样好像没反应啊...nl.getNewsContent()..有值..但就是存不进数据库(oracle)..麻烦各位帮帮忙..