嵌套循环PHP MySQL结果

Question

我从我的查询中得到结果，但我似乎没有得到嵌套的循环工作。这是可能有助于解释我正在尝试做什么的图像。

从本质上讲，这是我想要完成的。

以下是我在哪里有困难

<?php 
$query = "SELECT CandidateName, CandidateVotes, Party, MainRaceName, RaceName, win 
FROM candidates 
WHERE RaceID = $RaceID"; 

    $result = mysql_query($query) or die(mysql_error()); 
    for($i=0; $row = mysql_fetch_array($result); $i++){ 
    ?> 
     <!-- FOR LOOP 1 SHOW MainRaceName --> 
     { 
     <h1><?php echo $row['MainRaceName']; ?></h1> 


        <!-- FOR LOOP 2 SHOW RaceName --> 
       { 
       <h1><?php echo $row['RaceName']; ?></h1> 


        { 

        <h1><?php echo $row['CandidateName']; ?></h1> 
        <h1><?php echo $row['CandidateVote']; ?></h1> 
        . 
        . 

        } 

       } 
    }  



    <?php 
    } 
    ?> 

你可能有一个简单的解决方案，我很欣赏你的时间和帮助。 我正致力于将代码更改为PDO，并且我意识到SQL注入相关的风险。

Answer 1

如果您查询的是RaceName，则应该这样做。

<?php 
$query = "SELECT CandidateName, CandidateVotes, Party, MainRaceName, RaceName, win 
FROM candidates 
WHERE RaceID = $RaceID"; 

$result = mysql_query($query) or die(mysql_error()); 
for ($i = 0; $row = mysql_fetch_array($result), $i++) { 
    // Print out main race name and race name on first iteration only 
    if ($i === 0) { 
?> 
     <h1><?php echo $row['MainRaceName'] ?></h1> 
     <h1><?php echo $row['RaceName'] ?></h1> 
<?php 
    } 
?> 
    <p><?php echo $row['CandidateName'] ?></p> 
    <p><?php echo $row['CandidateVotes'] ?></p> 
<?php 
} 
?> 

如果你要查询MainRaceName，你需要在主竞赛打印出所有的比赛，我会组比赛名称与候选人一起，并获得特定种族的名字像这样总的候选人表决。

<?php 
$query = "SELECT CandidateName, CandidateVotes, Party, MainRaceName, RaceName, win 
FROM candidates 
WHERE RaceID = $RaceID"; 

$result = mysql_query($query) or die(mysql_error()); 

$grouped_result = array(); 
$total_votes = 0; 
$main_race = ''; 

for ($i = 0; $row = mysql_fetch_array($result), $i++) { 
    // If it is first iteration, set the current race name to race name in row 
    // and save main race name 
    if ($i === 0) { 
     $main_race = $row['MainRaceName']; 
     $cur_race = $row['RaceName']; 
    } 
    // If current race name is different than race name in row we reset 
    // total count of votes, since we need to have sum of votes grouped by race name 
    if ($cur_race != $row['RaceName']) { 
     $total_votes = 0; 
    }  
    // Populate grouped array 
    $grouped_result[$row['RaceName']]['candidates'][] = array(
     'name' => $row['CandidateName'], 
     'votes' => $row['CandidateVote'] 
    ); 
    $grouped_result[$row['RaceName']]['total_votes'] = $total_votes + $row['CandidateVotes'];; 
} 

从你的照片$grouped_result会给你一个这样的嵌套数组。

array(
    'President' => array(
     'candidates' => array(
      0 => array(
       'name' => 'Mr. X', 
       'votes' => 429 
      ), 
      1 => array(
       'name' => 'Ms. Y', 
       'votes' => 43 
      ), 
        . 
        . 
        . 
     ), 
     'total_votes' => 5247 
    ), 
    'US House of ...' => array(
     'candidates' => array(
      0 => array(
       'name' => 'whatever_his_name_is', 
       'votes' => 3693 
      )   
     ) 
     'total_votes' => 3693 
    ) 
) 

现在你可以去打印出html了。

<h1><?php echo $main_race ?></h1> 
<?php 
    // loop through all races 
    foreach ($grouped_result as $racename => $data): 
?> 
     <h1><?php echo $racename ?></h1> 
    <?php 
     // loop through all candidates in this race 
     foreach ($data['candidates'] as $candidate): 
    ?> 
      <p><?php echo $candidate['name'] ?></p> 
      <p><?php echo $candidate['votes'] ?></p> 
      <!-- Calculate vote percentages --> 
      <p><?php echo ($candidate['votes']/$data['total_votes']) * 100 ?> %</p> 
    <?php 
     endforeach; 
    ?> 
     <h1>Total votes: <?php echo $data['total_votes'] ?></h1> 
<?php 
    endforeach; 
?> 

现在你可以样式一切，投入到表中，无论...