select 
(select to_char(wm_concat(a.description)) from project_report_detail a 
 where project_report_id = t.id) as description2 ,
 t.* 
 from project_report t  
 where 1=1  order by t.dept_id 

 select 
(select wm_concat(a.description) from project_report_detail a 
 where project_report_id = t.id) as description2 ,
 t.* 
 from project_report t  
 where 1=1  order by t.dept_id 

private String ClobtoString(Clob clob){
        String reString = "";
        Reader is = null;
        try {
            is = clob.getCharacterStream();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 得到流
        BufferedReader br = new BufferedReader(is);
        String s = null;
        try {
            s = br.readLine();
        } catch (Exception e) {
            e.printStackTrace();
        }
        StringBuffer sb = new StringBuffer();
        while (s != null) {
            // 执行循环将字符串全部取出付值给StringBuffer由StringBuffer转成STRING
            sb.append(s);
            try {
                s = br.readLine();
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        reString = sb.toString();
        return reString;
    }