DecryptDataIntf: java實體類，對應於資料庫表字段

1.java存入Oracle大資料clob型別

public void addData(DecryptDataIntf decryptData) throws SQLException, IOException{
        Writer outStream = null;
        //1.插入語句中新增empty_clob()
        String insertSQL="insert into Decrypt_data_intf (Trans_Id,Request_Content,Invoke_Resule) values(?,empty_clob(),?)"
 
;
        if(insertPstm==null)
            insertPstm=conn.prepareStatement(insertSQL);
        insertPstm.setString(1,decryptData.getTransId());
        insertPstm.setLong(2, decryptData.getInvokeResule());
        insertPstm.executeUpdate();
        String queryToUpdateSql="select Request_Content from Decrypt_data_intf where Trans_Id=? for update"
 
;
        if (updatePstm==null) 
            updatePstm=conn.prepareStatement(queryToUpdateSql);
        updatePstm.setString(1, decryptData.getTransId());
        //必加語句，重要
        conn.setAutoCommit(false);
        ResultSet rs = updatePstm.executeQuery();
        if (rs.next()){
              //得到java.sql
 
.Clob物件後強制轉換為oracle.sql.CLOB
              oracle.sql.CLOB clob = (oracle.sql.CLOB) rs.getClob("Request_Content");
              outStream = clob.getCharacterOutputStream();
              //decryptData.getRequestContent()是傳入的字串
              char[] c = decryptData.getRequestContent().toCharArray();
              outStream.write(c, 0, c.length);
          }
        rs.close();
        outStream.flush();
        conn.commit();  
        outStream.close();

    }

2.clob型別轉字串

public String ClobToString(Clob clob) throws SQLException, IOException {

        String reString = "";
        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();
        is.close();
        br.close();
        return reString;
    }