Codeigniter查询生成器连接3表

我需要你的帮助，我有一张这样的桌子

单击id为的按钮查看产品时，我想查看产品的详细信息。 这就是我所做的。。似乎我需要在id和产品之间进行单一报价。。或者codeigniter是否有一个查询生成器来实现这一点

function get_detail_product($id_product){
        $query = "SELECT 
        p.id_product, p.product_name, p.price, p.discount, c.category, b.brand_name, p.description, p.spesification, p.picture, p.begin_date, p.end_date, p.qty
        FROM tbl_product as p, tbl_category as c, tbl_brand as b 
        WHERE p.id_Category = c.id_Category and p.id_brand = b.id_brand
        and id_product = ".$id_product;
        return $this->db->query($query);
    }

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看起来您没有正确返回它。试试这个。（未测试）

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CodeIgniter确实有一个查询绑定器，可以实现类似的功能。我还没有彻底检查过您的SQL，不知道它是否有效，但类似这样的查询看起来像：

$this->db->select('p.id_product, p.product_name, p.price, p.discount, c.category, b.brand_name, p.description, p.spesification, p.picture, p.begin_date, p.end_date, p.qty')
      ->from('tbl_product as p, tbl_category as c, tbl_brand as b')
      ->where('p.id_Category = c.id_Category')
      ->where('p.id_brand = b.id_brand')
      ->where('id_product', $id_product);
      $query = $this->db->get();
      return $query;

$this->db->select('*');
    $this->db->from('tbl_product');
    $this->db->join('tbl_category', 'tbl_category.id_category = tbl_products.id_category');
    $this->db->join('tbl_brand', 'tbl_brand.id_brand = tbl_products.id_brand', 'inner');
    $this->db->where('id_product', $id_product);
    $query = $this->db->get();
    return $query;

我有点不清楚你想要实现什么，我没有完全理解这个问题。您只是想让查询正常工作，还是想寻求建议，以便将所有信息集中到一行中？如果要联接表，可以尝试以下操作：

$this->db->select('p.id_product, p.product_name, p.price, p.discount, c.category, b.brand_name, p.description, p.spesification, p.picture, p.begin_date, p.end_date, p.qty')
      ->from('tbl_product as p, tbl_category as c, tbl_brand as b')
      ->where('p.id_Category = c.id_Category')
      ->where('p.id_brand = b.id_brand')
      ->where('id_product', $id_product);
      $query = $this->db->get();
      return $query;

$this->db->select('*');
    $this->db->from('tbl_product');
    $this->db->join('tbl_category', 'tbl_category.id_category = tbl_products.id_category');
    $this->db->join('tbl_brand', 'tbl_brand.id_brand = tbl_products.id_brand', 'inner');
    $this->db->where('id_product', $id_product);
    $query = $this->db->get();
    return $query;