查询排序包含在MySQL逗号分隔值

Question

正在创建谁想要在网上卖杂货

客户端的电子商务项目，我有一个价格栏，将包含产品的逗号分隔价格为各自的列数量。问题是我可以通过'价格从高到低'或'价格从低到高'功能。

这是示例表

**id** **Price**   **Quantity**   Name 
     1   20,30,50   250mlgm,500ml,1lt  Coca-Cola 
     2   40,60,70   250mlgm,500ml,1lt  Pepsi 

现在的问题是查询会是什么样子，如果我想从低的价格列进行排序，以高或低

按价格排序DESC或ORDER BY ASC价格不会在我的情况下工作

请指导我这个

一米乘爆炸逗号填充在选择标签中的每个产品的价格和数量，并将其保存在一个数组这样

<select ><option style='font-size:1vw;' value="Select Unit" >Select Unit</option> 

    <?php 
$drq=$rows['Quantity']; 
$drp=$rows['Price']; 
    $degh=explode(',',$drp); 
$tryGH=explode(',',$drq); 
    for($ij=0;$ij<count($tryGH);$ij++){ 
echo "<option style='font-size:1vw;' value=$degh[$ij] >$tryGH[$ij]&nbsp;-&nbsp;$degh[$ij]</option>"; 
    } 
    ?> </select> 

的结果看起来是这样的

Answer 1

您可以安排您的数据库的几种方法。一种方法是

**id** **Price**   **Quantity**   Name 
     1   20   250mlgm   Coca-Cola 
     2   30   500ml    Coca-Cola 
     3   50   1lt    Coca-Cola 

然后在你的代码，你可以输出到客户端与

<select name="unit" > 
    <option style='font-size:1vw;' value="Select Unit" >Select Unit</option> 
<?php 
$query = 'select Quantity, Price, Id, Name from Products ORDER BY name asc, Price DESC'; 
//execute the query, I don't know your driver 
while($row = FETCH_FROM_YOUR_DRIVER) { 
    $quantitY = $row['Quantity']; 
    $price = $row['Price']; 
    $id = $row['Id']; 
    $company = $row['Name']; 
    echo "<option style='font-size:1vw;' value='$id'>$quantity&nbsp;-&nbsp;$price&nbsp;$company</option>"; 
}?> 
</select> 

选择值那么你应该把它们选择ID并从数据库查询价格。在你现在的代码中，我认为你直接从客户那里获得价格。然而，客户端可以操作该送你的价格0

更新：

<style type="text/css"> 
.container { 
    display:block; 
    float:left; 
    margin:15px; 
} 
</style> 
<?php 
$query = 'select Quantity, Price, Id, Name from Products ORDER BY name asc, Price DESC'; 
//execute the query, I don't know your driver 
$count = 0; 
while($row = FETCH_FROM_YOUR_DRIVER /*again not sure of your driver*/) { 
    $products[$count]['id'] = $row['Id']; 
    $products[$count]['price'] = $row['Price']; 
    $products[$count]['quantity'] = $row['Quantity']; 
    $products[$count]['name'] = $row['Name']; 
    $count++; 
} 
/* Can be removed, I haven't set up a DB so this is how I test 
$products = array(array('id' => 2, 'price' => 30, 'quantity' => '500ml', 'name' => 'Coca-Cola'), 
      array('id' => 3, 'price' => 50, 'quantity' => '1lt', 'name' => 'Coca-Cola'), 
      array('id' => 4, 'price' => 20, 'quantity' => '25mlgm', 'name' => 'Pepsi'), 
      array('id' => 5, 'price' => 30, 'quantity' => '500ml', 'name' => 'Pepsi'), 
      array('id' => 6, 'price' => 50, 'quantity' => '1lt', 'name' => 'Pepsi')); 
*/ 
$sameproduct = false; 
foreach($products as $key => $product) { 
    if ($key == 0 || $products[($key - 1)]['name'] != $product['name']) { 
     if ($key != 0) { ?> 
      </select> 
      </div> 
     <?php } ?> 
    <div class="container"> 
     <h4><?php echo $product['name'];?></h4> 
     <img src="/images/LOCATION/<?php echo strtolower(str_replace(array(' ', '-'), '_', $product['name']));?>.jpg" /> <br /> 
    <select name="unit" > 
    <?php } ?> 
     <option style='font-size:1vw;' value='<?php echo $product['id'];?>'><?php echo $product['quantity'];?> - <?php echo $product['price'];?></option> 
<?php } ?> 

这需要你的名字是一致的，还假定在数据库名称图像中的名称相匹配你的文件系统。它用下划线替换名称中的空格和破折号。

Answer 2

尝试使用转换来转换字符串编号，然后对其进行分类

SELECT id, Price, Quantity FROM Products ORDER BY CONVERT(Price, UNSIGNED INTEGER) ASC