php - Codeigniter增量

Question

So I have this function that gets the total number of rows in a table.

This is my Code:

public function get_reservation()
    {
        $this->db->select('COUNT(*) as res_no ');
        $this->db->from('reservation_details');
        $query = $this->db->get()->result();
        echo json_encode($query);
    }

And it returns this JSON data

[{"res_no":"2"}]

What I want is to increment its value to 1 and return like this

[{"res_no":"3"}]

So far I have tried something like this

This is the my Code:

public function get_reservation()
    {
        $query = $this->db->select('COUNT(*) as res_no ')->from('reservation_details')->get();
        $price =  $query->row()->res_no;
        $price = $price + 1;
        echo json_encode($price);
    } 

But it only return 3

Answer 1

Hope this will help you :

Use CI query helper count_all to count all record of a table

public function get_reservation()
{
    $count = $this->db->count_all('reservation_details');
    $price = $count + 1;
    $data['res_no'] = $price;
    echo json_encode($data);
} 

For more : https://www.codeigniter.com/userguide3/database/helpers.html#information-about-your-database