public void queryStudent(String sql, String[] params) {
		columnNames = new Vector();				//
		columnNames.add("ѧ");
		columnNames.add("");
		columnNames.add("Ա");
		columnNames.add("");
		columnNames.add("༶");
		columnNames.add("סַ");
		rowDatas = new Vector();
		try {
			sqlHelper = new SqlHelper();//ݿĶ
			rs = sqlHelper.queryResult(sql, params);//òѯ
			//ѭȡѯÿΪһVectorӵrowDatasȥ
			while (rs.next()) {
				Vector row = new Vector();
				row.add(rs.getString(1));
				row.add(rs.getString(2));
				row.add(rs.getString(3));
				row.add(rs.getInt(4));
				row.add(rs.getString(5));
				row.add(rs.getString(6));
				rowDatas.add(row);
			}
		} catch (SQLException e) {
			// TODO: handle exception
			e.printStackTrace();
		} finally {
			sqlHelper.close();
		}
	}