$sql1 = "select * from a"; $result1 = mysql_query($sql1); while ($row1 = mysql_fetch_array($result1)) { $sql2 = "select * from b where a_id = '$row[a_id]'"; $result2 = mysql_query($sql2); while ($row2 = mysql_fetch_array($result2)) { echo $row["b_name"]."
"; } } 请问要用到PHPLIP的数据库类的时候，应该如何写呢？？