我想连接数据并显示一个表中的所有记录和另一个表中的一个记录

Question

I am a Codeigniter developer. I am working on an e-commerce site. I face one issue in the admin panel. I have two tables table_1= tbl_category table_2= tbl_products

I want to update a product. I fetch all data of product from tbl_products using this:

$this->db->select('*')
         ->from('tbl_products')
         ->where('cat_id,$id)
         ->get();

It is working perfect but I want to display a dropdown of all categories in the update product page. The problem is I can't find a solution how I can do it. I have to fetch one product by its id from tbl product but how to fetch all categories. I want a solution in Codeigniter. I will wait for your answers Please help me, friends.

Answer 1

you better remove the where clause or remove cat_id from where clause like:

$this->db->select('*')
         ->from('tbl_products')
         ->where('cat_id,$id) //remove where clause or remove cat_id
         ->get();

so that you will get all the categories selected

if u want to display data from other table having a foreign key then use left join on the keys

Answer 2

$this->db->select('*')
         ->from('tbl_products')
        ->join('tbl_category','tbl_category.id = tbl_products.id')
         ->get();