Question

我试图让一个while循环在另一个循环中工作，我之前已经让它工作但又无法再管理它。

我试图计算航班查询中的总记录数，然后在小时记录中尝试添加时间。我已将所有查询单独工作，但当我将它们组合在一起时，它无法正常工作。

这是我的代码，我可以更改哪些内容才能使其正常工作？

     <?php
        error_reporting (E_ALL ^ E_DEPRECATED);

            // get results from database
            $result = mysql_query("SELECT * FROM  `phpvms_pilots` WHERE  `confirmed` =  '1' AND  `retired` =  '0' ORDER BY pilotid ASC;") 
                or die(mysql_error());

            $resulttotalflights = mysql_query("SELECT COUNT(*) AS total_flights FROM `phpvms_pireps` WHERE `pilotid` = '$pid';") 
                or die(mysql_error());

            $resulttotalhours = mysql_query("SELECT SEC_TO_TIME( SUM(TIME_TO_SEC( `flighttime_stamp` ) ) ) AS total_hours FROM phpvms_pireps WHERE pilotid = '$pid'") 
                or die(mysqli_error());

            echo "<table width='100%' border='0' cellpadding='0' align='center'>";
            echo "<tr>
                    <th align='center'>Pilot ID</th>
                    <th align='center'>Name</th>
                    <th align='center'>Rank</th>
                    <th align='center'>Total Flights</th>
                    <th align='center'>Total Hours</th>
                    <th align='center'>Vatsim ID</th>
                  <tr>";

            // loop through results of database query, displaying them in the table
            while($row = mysql_fetch_array( $result )) {



            //$pid = 'RFR' . $row['pilotid'];
            $pid = $row['pilotid'];
            $first = $row['firstname'];
            $last = $row['lastname'];
            $vid = $row['vatsimid'];
            $rank = $row['rank'];

            while($row_flights = mysql_fetch_array( $resulttotalflights )) {$flights = $row_flights['total_flights'];}

            while($row_hours = mysql_fetch_array( $resulttotalhours )) {$hours = $row_hours['total_hours'];}

                // echo out the contents of each row into a table
                echo "<tr>";
                //echo '<td>' . $pid . '</td>';
                echo '<td><a href="' . $vaptams_profile . $pid . '">' . 'RFR' . $pid . '</a></td>';
                echo '<td>' . $first . ' ' . $last . '</td>';
                echo '<td>' . $rank . '</td>';
                echo '<td>' . $flights . '</td>';
                echo '<td>' . $hours . '</td>';
                echo '<td><a href="' . $vatawere . $vid . '">' . $vid . '</a></td>';
                echo "</tr>"; 
            } 

            // close table>
            echo "</table>";
        ?>

由于斯科特

Answer 1

不是使用3个while循环，每个循环都会出现一个会触发数据库的查询，为什么不只使用一个且只有这样的SQL查询：

SELECT
    `phpvms_pilots`.*,
    COUNT(`phpvms_pireps`.*) AS total_flights,
    SEC_TO_TIME( SUM(TIME_TO_SEC( `flighttime_stamp` ) ) ) AS total_hours
FROM `phpvms_pilots`
LEFT JOIN `phpvms_pireps` ON `phpvms_pireps`.`pilotid` = `phpvms_pilots`.`pilotid`
WHERE
    `phpvms_pilots`.`confirmed` = '1'
    AND `phpvms_pilots`.`retired` = '0'
ORDER BY pilotid ASC;

尝试在while循环中使用

1 个答案: