Question

为想要在线销售杂货的客户创建电子商务项目

并且我有一个价格列，其中包含相应数量的产品的逗号分隔价格。问题是我如何按＆＃39;价格从高到低或＆＃39;价格从低到高功能进行排序。

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，如果我想将价格列从低到高或从高到低排序，查询会是什么样子

ORDER BY Price DESC或ORDER BY价格ASC在我的案例中不起作用

请指导我这个

通过爆炸逗号并将它们保存在这样的数组中，在select标签中填充每个产品的价格和数量

 <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>

结果如下所示

enter image description here

Answer 1

您可以通过几种方式安排数据库。一种方法是

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

然后在您的代码中，您可以输出到客户端以使用

选择值

<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>

然后您应该选择他们选择的ID并从您的数据库中查询价格。在您当前的代码中，我认为您直接从客户端获取价格。然而，客户可以操纵它并向您发送0的价格。

<强>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 } ?>

这要求您的名称一致，并且还假定数据库中的名称与文件系统中的图像名称相匹配。它用下划线替换名称中的空格和短划线。

Answer 2

尝试使用convert将字符串转换为数字，然后对其进行排序

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

查询以在mysql中对包含逗号分隔值的列进行排序

2 个答案: