upper limit for active records in codeigniter - php

Question

I have this function in my model the purpose of it is to get the stats of the past 30 days starting from the actual day, it was working fine before i reach 30th day then I found out it is counting from the oldest date, so I flipped the order_by from "ase" to "desc" but it seems still going back and counting before the oldest day and not giving me that data I want, so I'm wondering if there any way using codeigniter and give a starting point for the "limit" which should be the actual date.
function graph_data($id_person)
{
$this->db->limit(30); // get data for the last 30 days including the curent day
$this->db->where('personid',$id_person);
$this->db->order_by('date', 'ase');
$query = $this->db->get('stats');
foreach($query-> result_array() as $row)
{
$data[] = $row;
}
return $data;
}

Answer 1

limit returns in your case the last 30 rows. It has nothing to do with dates, unless you only add a row each day.
try using mysql Between
SELECT DATE_FORMAT(create_date, '%m/%d/%Y')
FROM mytable
WHERE create_date BETWEEN SYSDATE() - INTERVAL 30 DAY AND SYSDATE()
ORDER BY create_date ASC
Source -- https://stackoverflow.com/a/2041619/337055

Answer 2

I finally found the solution by giving a range or days, 29 days before the actual day without using BETWEEN and that works fine
<?php
function graph_data($id_person)
{
$today = date('Y-m-d');
$lastdate = date('Y-m-d', strtotime('-29 days', strtotime($today)));// 30 days ago
$this->db->where('personid',$id_person);
$this->db->where("date <= '$today'");
$this->db->where("date >= '$lastdate'");
$this->db->order_by('date', 'ase');
$query = $this->db->get('stats');
$data = array();
foreach($query-> result_array() as $row)
{
$data[] = $row;
}
return $data;
}