將SQL結果分類並顯示在表中PhP

Question

我想在PHP/HTML表中顯示像這樣的MySQL結果。也許爲每個工廠添加鼠標信息，如果這很容易的話。

 
+-----------------------------------------------------------+ 
|category1 ¦ category2 ¦ category3 ¦ category4 ¦ category5 ¦ 
+-----------+-----------+-----------+-----------+-----------+ 
| plantName ¦ plantName ¦ plantName ¦ plantName ¦ plantName ¦ 
| plantName ¦ plantName ¦ plantName ¦ plantName ¦ plantName ¦ 
| plantName ¦ plantName ¦   ¦   ¦   ¦ 
|   ¦ plantName ¦   ¦   ¦   ¦ 
|   ¦ plantName ¦   ¦   ¦   ¦ 
+-----------+-----------+-----------+-----------+-----------+ 

首先，我通過海拔和降雨值來選擇植物。

$sql = mysql_query("SELECT * FROM `plants_tb` 
WHERE $elevate>= elevationLOW && $elevate<= elevationHI && 
$rainfall>= rainfallLOW && $rainfall<= rainfallHI ORDER BY commonNames ASC"); 

$plant = 'commonNames'; 
$elevationH = 'elevationHI'; 
$elevationL ='elevationLOW'; 
$rainfallL ='rainfallLOW'; 
$rainfallH ='rainfallHI'; 
$species ='species'; 

echo "<table border='1'><tr><th>Name</th><th>Category</th></tr>"; 
while($row = mysql_fetch_array($sql)){ 
echo "<tr><td>" . $row[$plant] . "</td><td>" . $row['heightHI'] . "</td></tr>"; 
} 
echo "</table>"; 

現在我需要按高度類別在列中顯示它們。也許我應該創建一個選定植物的臨時表格，然後對它們進行分類，然後將它們顯示在列中？ 這是我的分類想法。我知道這段代碼之間的關係不正確，但它讓我明白了。

$sql="SELECT tree_height FROM $Elevation_Rainfall_list; 
WHERE tree_height 
BETWEEN 1 AND 7 = $Category1 
BETWEEN 7 AND 15 = $Category2 
BETWEEN 15 AND 30 = $Category3 
BETWEEN 30 AND 9999 = $Category4 
if not = $Category5 

mahalo的支持！

Answer 1

看起來像你想創建一個像直方圖一樣。

，而不是試圖分類的SQL查詢的數據，你應該是這樣做在PHP：

$histogram = array(); 
# classify the data into histogram bins 
while($row = mysql_fetch_array($sql)) { 
    $h = $row['tree_height']; 
    $cat = 3; 
    if ($h <= 7) { 
     $cat = 0; 
    } elseif ($h <= 15) { 
     $cat = 1; 
    } elseif ($h <= 30) { 
     $cat = 2; 
    } 
    $histogram[$cat][] = $row['commonNames']; 
} 

# determine the number of rows in the table 
$rows = 0; 
foreach ($histogram as $ar) { $rows = max($rows, count($ar)); } 

# write a table with the data 
echo "<table border='1'>\n" . 
    " <tr>\n <td>Category 1</td>\n <td>Category 2</td>\n" . 
    " <td>Category 3</td>\n <td>Category 4</td>\n</tr>\n"; 
for ($i = 0; $i < $rows; ++$i) { 
    echo " <tr>\n"; 
    for ($cat = 0; $cat <= 3; ++$cat) { 
     echo " <td>" . $histogram[$cat][$i] . "</td>\n"; 
    } 
    echo " </tr>\n"; 
} 
echo "</table>\n";