嵌套循環PHP MySQL結果

Question

我從我的查詢中得到結果，但我似乎沒有得到嵌套的循環工作。這是可能有助於解釋我正在嘗試做什麼的圖像。

從本質上講，這是我想要完成的。

以下是我在哪裏有困難

<?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 
    } 
    ?> 

你可能有一個簡單的解決方案，我很欣賞你的時間和幫助。 我正致力於將代碼更改爲PDO，並且我意識到SQL注入相關的風險。

Answer 1

如果您查詢的是RaceName，則應該這樣做。

<?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 
} 
?> 

如果你要查詢MainRaceName，你需要在主競賽打印出所有的比賽，我會組比賽名稱與候選人一起，並獲得特定種族的名字像這樣總的候選人表決。

<?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'];; 
} 

從你的照片$grouped_result會給你一個這樣的嵌套數組。

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 
    ) 
) 

現在你可以去打印出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; 
?> 

現在你可以樣式一切，投入到表中，無論...