來自mysql數據庫的回聲數據

Question

嗨，大家有美好的一天。 我有一個問題關於回聲值形式MySQL數據庫 現在我有一個表名--->materialachievement 表裏面我有3個柱（章，子章節和部分）

的數據是象下面這樣：

chapter  subchapter   part 
------------------------------------- 
2    2.1    1 
2    2.1    2 
2    2.1    3 
2    2.2    1 
2    2.2    2 
3    3.1    1 
3    3.1    1 
------------------------------------- 

現在我想執行表呼應章2和3 和內側第2章有子章節2.1和子章節2.2 內部子章節2.1具有部分1，2，3和內部子章節2.2具有第1部分，2

結構是這樣的：

2 
2.1 
    1 
    2 
    3 
2.2 
    1 
    2 

所以我的問題是我如何才能呼應第2章一次，然後小節2.1次，然後去部分1，2，3？與sunchapter 2.2相同。

$query="SELECT * FROM materialachievement WHERE sID=$id GROUP BY (chapter and subchapter) ORDER BY chapter ASC , subchapter ASC "; 

$result=mysql_query($query,$conn); 

if($result === FALSE) 
{ 
die(mysql_error()); // TODO: better error handling 
} 

while($row=mysql_fetch_array($result)) 
{ 
    $chapter = $row['chapter']; 
    $subchapter = $row['subchapter']; 

    echo "<br>Chapter :".$chapter."<br>"; 
    echo "<br>Subchapter :".$subchapter."<br>"; 
} 

現在的結果假設爲：第2章，子章節2.1，子章節2.2，子章節2.3 和第3章，子章節3.1，子章節3.2

Answer 1

$query="SELECT * FROM materialachievement WHERE sID=$id ORDER BY chapter ASC, subchapter ASC, part ASC "; 

$result=mysql_query($query,$conn); 

if($result === FALSE) 
{ 
die(mysql_error()); // TODO: better error handling 
} 

$last_chapter = null; 
while($row=mysql_fetch_array($result)) 
{ 
    $chapter = $row['chapter']; 
    $subchapter = $row['subchapter']; 
    $part = $row['part']; 
    if ($last_chapter !=== $chapter) { 
     echo "Chapter: $chapter<br>"; 
     $last_chapter = $chapter; 
     $last_subchapter = null; 
    } 
    if ($subchapter !== $last_subchapter) { 
     echo "Subchapter: $subchapter<br>"; 
     $last_subchapter = $subchapter; 
    } 
    echo "Part: $part<br>"; 
} 

Answer 2

希望此幫助

$data=array(); 
$data[] = array("chapter" => "2",    "subchapter" => "2.1",    "part" => "1"    ); 
$data[] = array("chapter" => "2",    "subchapter" => "2.1",    "part" => "2"    ); 
$data[] = array("chapter" => "2",    "subchapter" => "2.1",    "part" => "3"    ); 

$data[] = array("chapter" => "2",    "subchapter" => "2.2",    "part" => "1"    ); 
$data[] = array("chapter" => "2",    "subchapter" => "2.2",    "part" => "2"    ); 

$data[] = array("chapter" => "3",    "subchapter" => "3.1",    "part" => "1"    ); 
$data[] = array("chapter" => "3",    "subchapter" => "3.1",    "part" => "1"    ); 

$new_array=array(); 

foreach($data AS $v){ 

    if(!array_key_exists($v['chapter'],$new_array)){ 
     $new_array[$v['chapter']]=array(); 
    } 
    if(!array_key_exists($v['subchapter'],$new_array[$v['chapter']])){ 
     $new_array[$v['chapter']][$v['subchapter']]=array(); 
    } 
    $new_array[$v['chapter']][$v['subchapter']]=$v['part']; 

} 

print_r($new_array); 

輸出

Array 
(
    [2] => Array 
     (
      [2.1] => 3 
      [2.2] => 2 
     ) 

    [3] => Array 
     (
      [3.1] => 1 
     ) 

)