Question

我在CodeIgniter框架中创建了一个函数，所以我可以在侧面菜单栏上看到我的数据库中的所有类别的产品，但是当我试图回显所有类别时我收到错误..我使用了db_helper.php文件来做它。

一些数据库信息：

db category table name: categories
I have 2 rows in the categories table:

Row 1 name of categories table: id
Row 2 name of categories table: name

这是我的db_helper.php文件：

<?php

function get_categories_h(){
    $CI = get_instance();
    $categories = $CI->Product_model->get_categories();
    return $categories;
}

这是我的Product_model.php文件：

<?php
defined('BASEPATH') OR exit ('No direct script access allowed');

class Product_model extends CI_model {

    public function saveProduct($data)
    {
        {
            $this->db->insert('products', $data);
            $product_id = $this->db->insert_id();
        }

        return $product_id;
    }



public function get_product_details($product_id) { 
$arrReturn = array(); 
$this->db->select('*'); 
$this->db->from('products'); 
$this->db->where('product_id', $product_id); 
$query = $this->db->get(); 
$result = $query->result_array(); 
if(!empty($result)){ 
$arrReturn = $result[0]; 
} 
return $arrReturn; 
}



/*
Get categories
*/

 function get_categories(){
        $ci =& get_instance();
        $ci->db->select('*');
        $ci->db->from('categories');
        $ci->db->get()->result_array();
        return $q;
    }


}

?>

    public function get_categories(){
        $this->db->select('*'); 
    $this->db->from('categories'); 
    $query = $this->db->get(); 
    $result = $query->result_array();
    }

这是视图文件中的侧边栏，我正在尝试回显我的数据库的所有类别（allecadeaus.php）：

<div class="container-fluid">
<div class="row">
    <div class="col-lg-3">
<div id="categorymenu">
  <center>  <h3>Categorieën</h3> </center>
        <ul class="list-group">
            <?php foreach(get_categories_h() as $category) : ?>
            <li class="list-group-item"><a href="#"><?php echo $category->name; ?> </a> </li>
            <?php endforeach; ?>
        </ul>
            </div>
            </div>

当我尝试加载视图文件时，我在侧栏而不是类别中看到此错误：

A PHP Error was encountered

Severity: Warning

Message: Invalid argument supplied for foreach()

Filename: views/allecadeaus.php

Line Number: 25

Backtrace:

File: /home/ubuntu/workspace/application/views/allecadeaus.php
Line: 25
Function: _error_handler

File: /home/ubuntu/workspace/application/controllers/AlleCadeausController.php
Line: 12
Function: view

File: /home/ubuntu/workspace/index.php
Line: 315
Function: require_once

当我打印获取类别的输出时：

A PHP Error was encountered



Severity: Notice


Message:  Undefined variable: q


Filename: models/Product_model.php


Line Number: 42





Backtrace:










            File: /home/ubuntu/workspace/application/models/Product_model.php

            Line: 42

            Function: _error_handler            








            File: /home/ubuntu/workspace/application/helpers/db_helper.php

            Line: 6

            Function: get_categories            








            File: /home/ubuntu/workspace/application/views/allecadeaus.php

            Line: 38

            Function: get_categories_h          












            File: /home/ubuntu/workspace/application/controllers/AlleCadeausController.php

            Line: 12

            Function: view          












            File: /home/ubuntu/workspace/index.php

            Line: 315

            Function: require_once

Answer 1

您可以将代码更改为以下解决方案。

请在autoload.php文件中添加帮助：

文件路径：application / config / autoload.php

spyOn(o, "foo")

请更改db_helper.php文件：

文件路径：application / helpers / db_helper.php

<?php 
/*
  | -------------------------------------------------------------------
  |  Auto-load Helper Files
  | -------------------------------------------------------------------
  | Prototype:
  |
  |   $autoload['helper'] = array('url', 'file');
 */

$autoload['helper'] = array('db_helper');

?>

您可以查看模态文件：

文件路径：application / modal / Product_model.php

<?php if (!function_exists('get_categories_h')) {
    function get_categories_h(){
        $CI = get_instance();
        $categories = $CI->Product_model->get_categories();
        return $categories;
    } } ?>

您可以更改视图文件。

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Product_model extends CI_model {

    public function saveProduct($data) { 
        $this->db->insert('products', $data);
        $product_id = $this->db->insert_id();
        return $product_id;
    }
    public function get_product_details($product_id) {
        $arrReturn = array();
        $this->db->select('*');
        $this->db->from('products');
        $this->db->where('product_id', $product_id);
        $query = $this->db->get();
        $result = $query->result_array();
        if (!empty($result)) {
            $arrReturn = $result[0];
        }
        return $arrReturn;
    }
    /*
      Get categories
     */
    public function get_categories(){
        $this->db->select('*'); 
        $this->db->from('categories'); 
        $query = $this->db->get(); 
        $result = $query->result_array();
        return $result;
    }
}
?>

我希望这会对你有所帮助。谢谢！

Answer 2

您可以在帮助程序itsef中的函数中编写代码，而不是从帮助程序调用模型，并将结果返回到视图文件。另外，您需要在cofig目录的autoupload.php文件中添加帮助程序。

 function get_categories(){
        $ci =& get_instance();
        $ci->db->select('*');
        $ci->db->from('categories');
        $q= $ci->db->get()->result();
        return $q;
    }

在CodeIgniter中获取函数中的类别不起作用

2 个答案: