php - 如何在每个类别的加载页面中仅获取 2 个产品

Question

我想在加载此页面时为每个类别显示两种产品，但如果我单击一个类别类型，那么它将显示所有产品。

这是我的代码:

<?php
   $resultspi= $con->query ("SELECT * FROM products WHERE ORDER BY id ASC"); 
   if ($resultspi->num_rows > 0) {
   while($rowpi = mysqli_fetch_array ($resultspi, MYSQL_ASSOC)) { 
         $id = $rowpi['id'];
         $types = $rowpi['type'];
         $image = $rowpi['images'];
         $names = $rowpi['name'];
 ?>
      <div class="item <?php echo $types;?>">
           <a href="uploads/products/<?php echo $image;?>" data-rel="gallery[prodcuts]" title="<?php echo $names;?>" class="">
              <img src="uploads/products/<?php echo $image;?>" alt="<?php echo $names;?>" class="thumb mCS_img_loaded" style="visibility: visible; opacity: 1;">
              <p class="info"> </p>
           <div class="overlay">
              <span></span>
           </div>
            </a>
       </div>
<?php 
      }
    }
 ?>

Answer 1

我使用这个查询。这段代码对我有用。

SELECT p1.id, p1.type,p1.name,p1.images FROM products p1 JOIN products p2 ON p1.type = p2.product_type AND p2.id >= p1.id GROUP BY p1.id, p1.type HAVING COUNT(*) <= 2 ORDER BY type, id