Codeigniter如何连接3表并从用户ID显示

Question

Mydatabase image click to see

i want to display

group1

• shop1
• shop2
• shop3

group2

• shop1
• shop2
• shop3
• shop5

group2

• .....
• ....
• ....

---

function getGroups($user_id) {

    $this->db->select ( '*' ); 
    $this->db->from ( 'user' );
    $this->db->join ( 'groups', 'groups.user_id = user.id');
    $this->db->join ( 'shop', 'shop.group_id = groups.group_id');
    $this->db->where('user.id',$user_id);
    return $this->db->get()->result_array();
}

Answer 1

Thank you all for Answer. I may not be don't understand for the above Answer. I use this method instead. It may not be the correct way. work for me.

function getGroups($user_id) {
    $this->db->select('*');
    $this->db->from('groups');
    $this->db->where('user_id', $user_id);
    $this->db->order_by('group_id', 'ASC');
    $group_data = $this->db->get()->result_array();

    foreach($group_data as $key=>$value){

        $this->db->select('*');
        $this->db->from('shop');
        $this->db->where('group_id', $value['group_id']);
        $this->db->order_by('shop_id', 'ASC');
        $shop_data = $this->db->get()->result_array();

        $my_group[$key]['group_name'] = $value['group_name'];
        $my_group[$key]['group_id'] = $value['group_id'];
        $my_group[$key]['group_shop'] = $shop_data;


    }
    return $my_group;
}

Answer 2

Add group by groups.id,shop.id and order by groups.id .

function getGroups($user_id) {
    $this->db->select ( '*' ); 
    $this->db->from ( 'user' );
    $this->db->join ( 'groups', 'groups.user_id = user.id');
    $this->db->join ( 'shop', 'shop.group_id = groups.group_id');
    $this->db->where('user.id',$user_id);
    $this->db->group_by(array('groups.id','shop.id'));
    $this->db->order_by("groups.id", "desc");
    return $this->db->get()->result_array();
}

Answer 3

try this..

function getGroups($user_id)
 {
    $this->db->select ( '*' ); 
    $this->db->from ( 'user' );
    $this->db->join ( 'groups', 'groups.user_id = user.user_id');
    $this->db->join ( 'shop', 'shop.group_id = groups.group_id');
    $this->db->where('user.user_id',$user_id);
    $this->db->group_by(array('groups.id','shop.id'));
    $this->db->order_by("groups.id", "desc");
    return $this->db->get()->result_array();
}