Question

因为我使用了两个表category(category_id, category_name) 第二个sub_category(sub_category_id, category_id, sub_category_title, sub_category_description, image, R_price, M_price, L_price, status)。我试图在category_id与sub_category表匹配时显示图像，价格和标题。但它无法正常执行

模型

function getid($id)
{
    $this->db->select('sub_category_id, category.category_name, sub_category_title, sub_category_description, image, R_price, M_price, L_price, status');
    $this->db->from('sub_category,category');
//  $this->db->join('category',' category.category_id = sub_category.category_id');
    $this->db->where('sub_category.category_id = category.category_id');
    $this->db->where('category.category_name = ',$id);
    $qry1 = $this->db->get();
    return $qry1->result_array();
}

控制器

public function product_grid()
    {
        $id= $this->input->post('dataid');
        echo 'Data-Id is form controller: '.$id ; 
        $data['rs'] = $this->PizzaUp_User_model->getid($id);
        $data['res'] = $this->PizzaUp_User_model->select('category');
        $this->load->view('product_grid',$data);
    }

Answer 1

显示图片，价格，标题格式sub_category table.so这里不需要加入类别表

使用类别ID
获取子类别详细信息

function getid($id)
{
    $this->db->select('sub_category_id,sub_category_title,sub_category_description, image, R_price, M_price, L_price, status');
        $this->db->from('sub_category');
        $this->db->where('sub_category.category_id',$id);
        $qry1 = $this->db->get();
        return $qry1->result_array();
}

Answer 2

@Vidhi Patel请尝试简单加入，如果你不想迷惑自己，请使用小别名

function getid($id)
{
    $this->db->select('sc.*, c.category_id');
    $this->db->from('sub_category as sc');
    $this->db->join('category as c','c.category_id = sc.category_id','LEFT');
    $this->db->where('sc.category_id',$id);
    $qry1 = $this->db->get();

    if ($qry1->num_rows() > 0)
    {
        return $qry1->result_array();
    }
    return false;
}

我正在尝试过滤数据类别

2 个答案: