public int getSizeByNumAndLength(int num, int length) {
		String sql = "select count(id) from " + TABLE + " where length=? and num=?";
		Object[] args = new Object[] { length, num };
		int[] argTypes = new int[] { Types.INTEGER, Types.INTEGER };
		int n = 0;
		try {
			n = this.getJdbcTemplate().queryForInt(sql, args, argTypes);
		} catch (Exception e) {
			n = 0;
		}
		return n;
	}