Question

我有点疑惑，有人可以查看这个查询并告诉我我做错了吗？

SELECT d.* FROM as_downloads d LEFT JOIN as_categories c ON (d.download_category_id = c.category_id) WHERE d.download_category_id != -1 LIMIT 30

从as_downloads表中获取行但不加入类别表..

Theres没有错误，我曾在PHPMyAdmin中测试过相同的结果，这是使用的PHP代码

class Model_Downloads extends ModelType_PDO
{
    public function fetchDownloads($limit)
    {
        $p = Registry::get('Config')->Database->prefix;

        $query = "SELECT d.* FROM ".$p."downloads d LEFT JOIN ".$p."categories c ON d.download_category_id = c.category_id WHERE d.download_category_id != -1 LIMIT :limit";
        $this->query = $this->prepare($query);
        $this->query->bindValue(':limit',$limit,PDO::PARAM_INT);

        if($this->query->execute())
        {
            return $this->query->fetchAll(PDO::FETCH_CLASS);
        }
        return false;
    }
}

Answer 1

您的查询仅选择下载表格中的列 - d.*。您只需要从类别中指定所需的列。

非常简单的MySQL Query无法正常工作

1 个答案: