Oracle存儲過程的調用以及返回結果集的提取

DEMO例子

/****
 * 查詢用戶所有持有的產品(DEMO)
 * @param session
 * @param clientNo
 * @param productCode
 * @return
 * @throws MallException
 */
public Map<String, Object> queryUserProduct(Session session, int clientNo, String productCode) throws MallException {

 Connection connection = null;
 CallableStatement callableStatement = null;
 ResultSet resultSet = null;
 String errorMsg = "";
 int errorcode = -1;
 List<Map> result = null;
 try {
 connection = session.connection();//按需替換成自己的connection
 connection.setAutoCommit(false);
 String callProcSql = "{ call QUERY_USER_PRODUCT (?,?,?,?) }";

 callableStatement = connection.prepareCall(callProcSql);
 //存儲過程入參
 callableStatement.setInt(1, clientNo);//客戶號
 callableStatement.setString(2, productCode);//產品代碼
 callableStatement.registerOutParameter(4, -10); //輸出的是結果集
 callableStatement.registerOutParameter(5, -10);
 callableStatement.execute();
 resultSet = (ResultSet) callableStatement.getObject(4);
 try {
 if (resultSet != null) {
 result = extractData(resultSet);//結果集抽取
 if (result != null && result.size() > 0) {
 try {
 errorcode = Integer.parseInt(result.get(0).get("error_code") + "");
 } catch (Exception e) {
 e.printStackTrace();
 }
 errorMsg = (String) result.get(0).get("error_msg");
 }
 }
 } finally {
 if (resultSet != null){
 resultSet.close();
 }
 }

 if (connection != null) {
 connection.commit();
 }

 } catch (Exception ex) {
 ex.printStackTrace();
 try {
 if (connection != null) {
 connection.rollback();
 }
 } catch (SQLException e) {
 e.printStackTrace();
 }
 errorMsg = ex.getMessage(); //返回的錯誤消息按需定義
 } finally {
 try {
 if (callableStatement != null) {
 callableStatement.close();
 callableStatement = null;
 }
 if (connection != null && !connection.isClosed()) {
 connection.close();
 }
 connection = null;
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 Map<String, Object> resultMap = new HashMap<String, Object>();
 resultMap.put("error_msg", errorMsg);
 resultMap.put("error_code", errorcode);
 return resultMap;
}

/**
 * 返回的結果集提取
 * 轉為List<Map>
 * @param resultSet
 * @return
 * @throws SQLException
 */
private List<Map> extractData(ResultSet resultSet) throws SQLException {
 if (resultSet == null) {
 return null;
 }
 ResultSetMetaData metaData = resultSet.getMetaData();
 List<Map> result = new ArrayList<Map>();
 while (resultSet.next()) {
 Map map = new LinkedHashMap();
 for (int i = 0; i < metaData.getColumnCount(); i++) {
 Object o = resultSet.getObject(metaData.getColumnName(i + 1));
 String key = ((String) metaData.getColumnName(i + 1)).toLowerCase();
 map.put(key, resultSet.getString(metaData.getColumnName(i + 1)));
 }
 result.add(map);
 }
 return result;
}