How can I implement this SQL query using CodeIgniter Query Builder? - php

Question

I am a beginner using codeigniter query builder class. How can I do this SQL in Query builder Codeigniter..?
Any help is appreciated. Thanks!
SET #interval = 15;
SET #store = 1;
SET #id = 0;
SET #start_dt = '2022-10-12 13:30:00';
SET #end_dt = '2022-10-12 22:30:00';
SELECT
mrt.shoptype_code,
DATE_ADD(#start_dt, INTERVAL vt1.num MINUTE) AS v_dt,
(
SELECT count(*)
FROM s_reservation
WHERE store_code = #store AND id <> #id AND shop_type = mrt.shoptype_code AND status=1 AND start_time <= v_dt AND v_dt < end_time
) AS reservations
FROM
(
SELECT #num := 0 AS num UNION
SELECT #num := #num + #interval FROM information_schema.COLUMNS
) AS vt1
CROSS JOIN
m_shoptype AS mrt
WHERE mrt.store_code = #store
HAVING v_dt BETWEEN #start_dt AND #end_dt
Here I'm trying...
$this->db->SELECT('mrt.shoptype_code AS reservations');
$this->db->DATE_ADD('#start_dt', 'INTERVAL vt1.num MINUTE');
$this->db->SELECT('count(*)');
$this->db->where('store_code = #store AND id <> #id AND shop_type = mrt.shoptype_code AND status=1 AND start_time <= v_dt AND v_dt < end_time');
$this->db->join('m_shoptype as mrt','true');
$result = $this->db->get('s_reservation as reservations')->result();
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
echo "Status " . $row["reservations"]. "<br>";
}
}
else {
echo "Na data found..! ";
}