php - CodeIgniter。允许的内存大小错误和分页

Question

我将从一开始就开始，我正在使用代码点火器创建小型CMS，但我遇到的问题很少。我是初级使用php框架，所以请不要生我的气。

现在，我有数据库中的车辆型号列表，而且列表很大。所以我从CodeIgniter得到了错误:

A PHP Error was encountered

Severity: Error

Message: Allowed memory size of

目前，我已经注释了代码点火器输出配置文件中的代码行，向我显示了此错误。我有一个明确的值(value)观 list ，我想拥有。但是它太多了。所以我想到了分页。

您的意见是什么，对我有帮助吗？也许您有更好的建议/建议？

因此，我试图降低该错误并创建分页，但失败了。

如果是“列表”，则这是我的 Controller :

     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);
        }

，这是模型文件中的代码:

<?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    ---------------------------------------*/
} 

这是我的 View 文件:

<?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>
                                <a href="#" id="<?php echo $model->id; ?>"><?php echo $model->v_model_name; ?></a> 
                            </td>
                            <?php foreach($brands as $brand) :?><?php if($model->vehicle_brand_id == $brand->id) :?>
                            <td>
                                <a href="<?php echo base_url(); ?>admin/brands/edit/<?php echo $brand->id; ?>"  id="<?php echo $brand->id; ?>"><?php echo $brand->v_brand_name; ?></a> 
                            </td>
                                <?php endif; ?>
                            <?php endforeach; ?>
                            <td>
                                <a href="#" id="<?php echo $model->vehicle_category_id; ?>"><?php echo $model->category_name; ?></a> 
                            </td>
                            <td>

                            </td>
                            <td>
                                <a href="<?php echo base_url(); ?>admin/models/edit/<?php echo $model->id; ?>" class="btn btn-primary">Edit</a> 
                                <a href="<?php echo base_url(); ?>admin/models/delete_row/<?php echo $model->id; ?>" class="btn btn-danger">Delete</a>
                            </td>
                        </tr>
                    <?php endif; ?>
                <?php endforeach; ?>
                </tbody>
            </table>
        </div>
        <!-- *************************            ****************************************-->
    <?php endif;?>
<?php endforeach; ?>

**更多问题**
因此，也许有人可以帮助我创建分页？

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);

分页会帮助我处理许多 list 项目吗？
也许有人可以帮助我编写代码？谢谢。

Answer 1

您的代码点火器代码首先将整个列表存储在数组中。之后，您尝试构建屏幕。也许您可以从SQL连接开始，并在该连接中使用limit来限制行数。另外，发送您的脚本页码以进行分页。

<?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();

这样，您将不会提取整个数据，这最终会导致内存耗尽错误。