Question

我想获取三个表的数据“类别，子类别，产品” ，但我必须得到一些错误

警告：mysqli_fetch_array（）期望参数1为mysqli_result，布尔值为in 第157行上的D：\ xammp \ htdocs \ tam \ admin \ edit-products.php

PHP SQL

<?php   
    $query=mysqli_query($conn,"select * from  products.*,

                       category.categoryName as catname,

                       subcategory.subcategory as categoryName

                       from products join category on 

                       category.cid=products.cid 

                       join subcategory on subcategory.sid=products.sid

                       where products.id='$id'");

       while($row=mysqli_fetch_array($query))// line 157
        { ?> 

           }?>

Answer 1

您选择错误，应该像下面这样

select products.*,
       category.categoryName as catname,
       subcategory.subcategory as categoryName
  from products 
  join category 
    on category.cid=products.cid 
  join subcategory 
    on subcategory.sid=products.sid
 where products.id=?

加入三张表遇到一些问题对我有帮助吗？

1 个答案: