如何在While语句内部运行While语句以从数据库中获取值？

Question

这里是我的功能：

 $result_display = mysql_query("SELECT * FROM Events ORDER BY TimeStamp DESC LIMIT $y, 20"); 
     $result_comment = mysql_query("SELECT * FROM Comments"); 


while($row_display = mysql_fetch_array($result_display)){ 
    echo "<div id='id'" . $row_display['ID'] . " class='eventdiv' data-sort='".$row_display['TimeStamp']."'>".$row_display['Title']." TIME: ".$row_display['TimeStamp']."</div>"; 

    while($row_comment = mysql_fetch_array($result_comment)){ 
     echo $row_comment['com_details']; 
    } 

} 

的HTML输出与此类似：

<div id='id12' class='eventdiv' data-sort='238781>Time: 238781</div> 
<div id='id13' class='eventdiv' data-sort='238784>Time: 238784</div> 
<div id='id14' class='eventdiv' data-sort='238785>Time: 238785</div> 
<div id='id15' class='eventdiv' data-sort='238789>Time: 238789</div> 
<div id='id16' class='eventdiv' data-sort='238791>Time: 238791</div> 
<div id='id17' class='eventdiv' data-sort='238795>Time: 238795</div> 

These are the comment details... 

但我想输出是这样的：

<div id='id12' class='eventdiv' data-sort='238781>Time: 238781</div> 

These are the comment details... 

<div id='id13' class='eventdiv' data-sort='238784>Time: 238784</div> 

These are the comment details... 

<div id='id14' class='eventdiv' data-sort='238785>Time: 238785</div> 

These are the comment details... 

<div id='id15' class='eventdiv' data-sort='238789>Time: 238789</div> 

These are the comment details... 

<div id='id16' class='eventdiv' data-sort='238791>Time: 238791</div> 

These are the comment details... 

<div id='id17' class='eventdiv' data-sort='238795>Time: 238795</div> 

These are the comment details... 

我认为我在while语句中使用while语句的方式，它会像上面的HTML一样显示它，但它不会。

Answer 1

第一次运行$ result_comment结果后，必须用mysql_data_seek($result_comment)重置它。所以：

while($row_display = mysql_fetch_array($result_display)){ 
    echo "<div id='id'" . $row_display['ID'] . " class='eventdiv' data-sort='".$row_display['TimeStamp']."'>".$row_display['Title']." TIME: ".$row_display['TimeStamp']."</div>"; 

    while($row_comment = mysql_fetch_array($result_comment)){ 
     echo $row_comment['com_details']; 
    } 

    mysql_data_seek($result_comment); 

} 

Answer 2

你需要在第一while循环运行的每个要素的查询。目前，有没有什么关联与每个事件的评论：

$result_comment = mysql_query("SELECT * FROM Comments WHERE [id]=$id");

Answer 3

@DemianBrecht，我将两个表我只是还没有那么做关联。这里并不需要是一个协会得到什么我需要 - @Jed，我不知道为什么，但你提出的解决方案是产生这个错误：

'Wrong parameter count for mysql_data_seek()' 

我发现它为什么不工作，第二个提取函数需要放在第一个while语句中。否则，它将在它完成后执行：

$result_display = mysql_query("SELECT * FROM Events ORDER BY TimeStamp DESC LIMIT $y, 20"); 

while($row_display = mysql_fetch_array($result_display)){ 
    echo "<div id='id'" . $row_display['ID'] . " class='eventdiv' data-sort='".$row_display['TimeStamp']."'>".$row_display['Title']." TIME: ".$row_display['TimeStamp']."</div>"; 

    while($row_comment = mysql_fetch_array($result_comment)){ 

     $result_comment = mysql_query("SELECT * FROM Comments"); 
     echo $row_comment['com_details']; 

    } 

} 

够简单。