While循环中有多个While循环？

Question

所有尝试学习的新手...感谢迄今为止的所有帮助！

更新 - 下面更新了代码 - 感谢 Phill

我现在正试图从表 horses 中获取相关的马信息，我可以使用 horse_name 字段将其加入 race_form。然后，我想在 while($racecard) 信息下方显示比赛中每匹马的信息。这是否使它更清晰一点？

我想我可以只做另一个查询，然后用 mysql_fetch_array 在我已经拥有的那个下面进行一个 while 循环，这将显示它然后进入下一场比赛，但这显然行不通......？！

我想知道您是否可以在一个while 循环中一个接一个地运行2 个while 循环？我正在制作赛马表格指南 - 我可以显示每场比赛列表，但在下面我想显示比赛中每匹马的个别马匹详细信息。无论如何，如果您查看此页面，您可以看到我正在尝试做的事情：

http://tasmanianracing.com/superform/formguide.php?meetingID=21042011LAUN&Submit=View+Form

问题是，只要我在比赛列表后面放第二个 while 循环，它就不会出现。我正在尝试运行查询以从我的马表中获取马的详细信息，然后为比赛中的每匹马运行一段时间，但没有任何显示。

我希望这已经足够清楚了......我的 sn-p 代码如下 - 如果我错过了重要的事情，请告诉我：

---

echo "<table width='990' border='1' cellspacing='2' cellpadding='2'>";

$racedetails = mysql_query("SELECT * 
    FROM race_info
    WHERE meetingID = ('" . $safemeetingID . "')");

while($row = mysql_fetch_array($racedetails))
{
    echo "<tr><td>Race " . $row['race_number'] . " at " . $row['start_time'] . " " . $row['class'] . " over " . $row['distance'] . "m</td></tr>";

    $racecard = mysql_query("SELECT *
        FROM race_form
        INNER JOIN race_info ON race_form.raceID = race_info.raceID
        WHERE race_form.raceID = ('" . $row['raceID'] . "')");

    while($row = mysql_fetch_array($racecard))
    {
        echo "<tr><td>" . $row['number'] . "</td><td>" . $row['past10'] . "</td><td>" . $row['horse_name'] . "</td></tr>";
    }

    echo "</table><br>";

    echo "<br>I wish I could put in some horse form here...<br>";

    echo "<table width='990' border='1' cellspacing='2' cellpadding='2'>";

}

echo "</table>";

Answer 1

您可能需要更改一些$row 变量的名称，它们可能会相互干扰。

例如：

while($row_races = mysql_fetch_array($totalraces)){
while($row_details = mysql_fetch_array($racedetails)){
while($row_card = mysql_fetch_array($racecard)){

Answer 2

我认为您可以摆脱您的一个查询：

第一个查询通过选择一个 COUNT 来获取比赛的数量，这将返回一条带有计数值的记录。

// This returns one record with the count
$total_races    = "SELECT COUNT(race_number) AS totalraces 
                   FROM race_info WHERE meetingID = ('".$safemeetingID."') ";

接下来，您将遍历相同的记录，因为为比赛详细信息返回的行与计数相同。

// This looks to return the record(s) with the race details
$race_details   = "SELECT * FROM race_info 
                    WHERE meetingID = ('" . $safemeetingID . "')";

我认为您可以使用它来获得所需的结果：（我同意将 $row 变量重命名为每个 while 循环的描述性）

$racedetails = mysql_query("SELECT *
FROM race_info
WHERE meetingID = ('" . $safemeetingID . "')");

while($details_row = mysql_fetch_array($racedetails))
{
    echo "<tr><td>Race " . $details_row['race_number'] . " at " . $details_row['start_time'] . " " . $details_row['class'] . " over " . $details_row['distance'] . "m</td></tr>";

    $racecard = mysql_query("SELECT *
    FROM race_form
    INNER JOIN race_info ON race_form.raceID = race_info.raceID
    WHERE race_form.raceID = ('" . $details_row['raceID'] . "')");

    while($rc_row = mysql_fetch_array($racecard))
    {
    echo "<tr><td>" . $rc_row['number'] . "</td><td>" . $rc_row['past10'] . "</td><td>" . $rc_row['horse_name'] . "</td></tr>";
    }

    echo "</table><br>";

    echo "Testing<br>Testing<br>I wish I could put in some horse form here...<br>";

    echo "<table width='990' border='1' cellspacing='2' cellpadding='2'>";

}

未经测试/伪代码

"SELECT * 
FROM horses AS h, 
INNER JOIN race_info  AS ri ON race_form.raceID = race_info.raceID
WHERE horse_name IN (
    SELECT horse_name
    FROM race_form AS srf
    WHERE h.horse_name = srf.horse_name
)
AND race_form.raceID = ('" . $details_row['raceID'] . "')"

这个想法是将两个查询合并为一个，我知道这不是正确的语法，但它可能会让你知道如何去做。

或者你可以在while循环中查询马的名字

$racedetails = mysql_query("SELECT *
FROM race_info
WHERE meetingID = ('" . $safemeetingID . "')");

while($details_row = mysql_fetch_array($racedetails))
{
    echo "<tr><td>Race " . $details_row['race_number'] . " at " . $details_row['start_time'] . " " . $details_row['class'] . " over " . $details_row['distance'] . "m</td></tr>";

    $racecard = mysql_query("SELECT *
    FROM race_form
    INNER JOIN race_info ON race_form.raceID = race_info.raceID
    WHERE race_form.raceID = ('" . $details_row['raceID'] . "')");

    while($rc_row = mysql_fetch_array($racecard))
    {
        echo "<tr><td>" . $rc_row['number'] . "</td><td>" . $rc_row['past10'] . "</td><td>" . $rc_row['horse_name'] . "</td></tr>";

        $horses = mysql_query("SELECT *
        FROM horses
        WHERE horse_name = ('" . $rc_row['horse_name'] . "')");

        while($horse_row = mysql_fetch_array($horses))
        {
            // echo horse details here
        }
    }

    echo "</table><br>";

    echo "Testing<br>Testing<br>I wish I could put in some horse form here...<br>";

    echo "<table width='990' border='1' cellspacing='2' cellpadding='2'>";

}

Answer 3

我理论你可以，实际上你可以，但是while 中的while 中的for 中的while 似乎有点在顶部...

如果您解释一下您要做什么，我相信我们可以帮助您提高效率。