1.利用dbms_lob.substr()方法可將對應欄位轉換成字串如下：

select dbms_lob.substr(content) from NEWS  

該方法有個缺點，當content欄位長度超過某個值時，會報錯。

2.獲取Clob物件，在Java中通過對流處理獲取欄位內容，該方式沒有長度限制

select content from NEWS

// 將字CLOB轉成STRING型別 
    public String ClobToString(Clob clob) throws SQLException, IOException { 
    	
        String reString = ""; 
        java.io.Reader is = clob.getCharacterStream();// 得到流 
        BufferedReader br = new BufferedReader(is); 
        String s = br.readLine(); 
        StringBuffer sb = new StringBuffer(); 
        while (s != null) {// 執行迴圈將字串全部取出付值給StringBuffer由StringBuffer轉成STRING 
            sb.append(s); 
            s = br.readLine(); 
        } 
        reString = sb.toString(); 
        return reString; 
    } 
 

String content = ClobToString((Clob)obj[1]);