CodeIgniter. Allowed memory size error and pagination - php

Question

I will start from very beginning, I am creating small CMS with code igniter and I faced with few problems. I am junior in working with php frameworks, so please do not be angry at me.
Right now I have vehicles models lists from database and that one is large. So I got Error from CodeIgniter:
A PHP Error was encountered
Severity: Error
Message: Allowed memory size of
At this moment I'm already commented the line of code from code igniter output configuration file, which shows me this error. And I have a clear list of values, that I want to have. But its too many. So I thought about PAGINATION.
What its your opinion, can it help me? maybe you have some better advice/suggestion?
So I tried to turn that error down and create a pagination, but I failed.
This is my controller if "lists":
public function lists(){
//get models
$data['models'] = $this->Model_model->get_models('id', 'DESC');
//get brands
$data['brands'] = $this->Model_model->get_brands('id', 'DESC');
//get brands
$data['brand'] = $this->Model_model->get_brands('id', 'DESC');
//get categories
$data['categories'] = $this->Model_model->get_categories('id', 'DESC');
//get Users
//$data['users'] = $this->User_model->get_users('id', 'DESC', 5);
//View
$data['main_content'] = 'admin/models/lists';
$this->load->view('admin/layouts/main', $data);
}
This is code from model file:
<?php
class Model_model extends CI_Model
{
/*
* Get vehicle models
*
* #param - $order_by (string)
* #param - $sort (string)
* #param - $limit (int)
* #param - $offset (int)
*
* */
public function get_models($order_by = null, $sort = 'DESC', $limit = null, $offset = 0)
{
$this->db->select('vm.*, vb.v_brand_name as v_brand_name, vc.category_name as category_name, u.first_name, u.last_name');
$this->db->from('vehicle_models as vm');
$this->db->join('vehicle_brands as vb', 'vb.id = vm.vehicle_brand_id');
$this->db->join('vehicle_category as vc', 'vc.id = vb.vehicle_category_id', 'vb.vehicle_category_id = vm.vehicle_category_id', 'left');
$this->db->join('users as u', 'u.id = vb.user_id', 'left');
if ($limit != null) {
$this->db->limit($limit, $offset);
}
if ($order_by != null) {
$this->db->order_by($order_by, $sort);
}
$query = $this->db->get();
return $query->result();
}
/*
*
*Get Menu Items
*
* */
/* public function get_models(){
$this->db->where('id', 1);
$this->db->order_by('id');
$query = $this->db->get('vehicle_models');
return $query->result;
}*/
/*
*GET SINGLE ARTICLE
* */
public function get_model($id)
{
$this->db->where('id', $id);
$query = $this->db->get('vehicle_models');
return $query->row();
}
/*
* Get vehicle Categories
*
* #param - $order_by (string)
* #param - $sort (string)
* #param - $limit (int)
* #param - $offset (int)
*
* */
public function get_categories($order_by = null, $sort = 'DESC', $limit = null, $offset = 0)
{
$this->db->select('*');
$this->db->from('vehicle_category');
if ($limit != null) {
$this->db->limit($limit, $offset);
}
if ($order_by != null) {
$this->db->order_by($order_by, $sort);
}
$query = $this->db->get();
return $query->result();
}
/*
* Get vehicle Brands
*
* #param - $order_by (string)
* #param - $sort (string)
* #param - $limit (int)
* #param - $offset (int)
*
* */
public function get_brands($order_by = null, $sort = 'DESC', $limit = null, $offset = 0)
{
$this->db->select('*');
$this->db->from('vehicle_brands');
if ($limit != null) {
$this->db->limit($limit, $offset);
}
if ($order_by != null) {
$this->db->order_by($order_by, $sort);
}
$query = $this->db->get();
return $query->result();
}
/*
*
*Insert Model
*
* */
public function insert($data){
$this->db->insert('vehicle_models', $data);
return true;
}
/*public function insert_models($data){
$models = implode(',',$_POST['v_model_name']);
$this->db->insert('vehicle_models', $data);
$this->db->into('vehicle_models', $data);
$this->db->values($model);
}*/
public function update($data, $id){
$this->db->where('id', $id);
$this->db->update('vehicle_models', $data);
return true;
}
public function did_delete_row($id){
$this -> db -> where('id', $id);
$this -> db -> delete('vehicle_models');
return true;
}
/* --------------------------- PAGINATION ---------------------------------*/
public function __construct() {
parent::__construct();
}
public function record_count() {
return $this->db->count_all("vehicle_models");
}
public function fetch_countries($limit, $start) {
$this->db->limit($limit, $start);
$query = $this->db->get("vehicle_models");
if ($query->num_rows() > 0) {
foreach ($query->result() as $row) {
$data[] = $row;
}
return $data;
}
return false;
}
/*-------------------------- AND OF PAGINATION ---------------------------------------*/
}
And this is my view file:
<?php foreach($categories as $category) :?>
<?php
$this->load->helper("url"); /
$postid = $this->uri->segment(4);
if ($category->id == $postid):
?>
<!-- ************************* ****************************************-->
<div class="table-responsive col-md-12">
<h2><?php echo $category->category_name; ?></h2>
<table class="table table-striped">
<thead>
<tr>
<th>Model (+View)</th>
<th>Brand</th>
<th>Category</th>
<th></th>
<th>Moves</th>
</tr>
</thead>
<tbody>
<?php foreach ($models as $model) : ?>
<?php if($model->vehicle_category_id == $postid) :?> <!-
<tr>
<td>
<?php echo $model->v_model_name; ?>
</td>
<?php foreach($brands as $brand) :?><?php if($model->vehicle_brand_id == $brand->id) :?>
<td>
<?php echo $brand->v_brand_name; ?>
</td>
<?php endif; ?>
<?php endforeach; ?>
<td>
<?php echo $model->category_name; ?>
</td>
<td>
</td>
<td>
Edit
Delete
</td>
</tr>
<?php endif; ?>
<?php endforeach; ?>
</tbody>
</table>
</div>
<!-- ************************* ****************************************-->
<?php endif;?>
<?php endforeach; ?>
** MORE QUESTIONS**
So maybe somebody can help me to create PAGINATION?
I tried to put this code to "list" controller function but its didnt
work:
public function lists1(){
$this->load->library('pagination');
$config['base_url'] = 'http://localhost/test/admin/Models/lists/';
$config['per_page'] = 5;
$config['num_links'] = 5;
$config['total_rows'] = $this->db->get('vehicle_models')->num_rows();
/*$config['total_rows'] = $this->db->get_models('v_model_name');*/
$this->pagination->initialize($config);
$data['query'] = $this->db->get('vehicle_models', $config['per_page'],$this->uri->segment(4)); /*segment*/
$this->load->view('admin/models/lists', $data); /*nuoroda*/
echo $this->pagination->create_links();
$data['main_content'] = 'admin/models/lists';
$this->load->view('admin/layouts/main', $data);
Will pagination will help me to deal with to many list items?
Maybe somebody can help me with code? Thanks.

Answer 1

Your codeigniter code is storing the entire list in array first. After that you are trying to build the screen. Perhaps you can start with a SQL join and use limit in that join to restrict the number of rows. Also, send your script page number for pagination.
<?php
$current = $_GET['page'];
$rowCount = $_GET['length'];
$sql = "select * from model m
inner join brand b
on m.vehicle_brand_id = b.id
limit ".($current - 1)*($rowCount).",".$rowCount;
$query = $this->db->query($sql);
$content['tableList'] = $query->result();
In this way, you will not pull entire data, which eventually causes memory exhaustion error.