codeigniter 模型错误:未定义的属性

问题描述

可能的重复:
错误:获取非对象的属性

我是 codeigniter 模型的新手，我尝试按照文档中的步骤加载在我的数据库中注册的所有用户.

这是我的模型:user.php

class 用户扩展模型 {函数用户(){父::模型();}函数所有用户(){$query = $this->db->query("select * from user limit 0,5");//第 30 行错误，如我的 IDE 位于此行中返回 $query->result();}}

这是我的控制器:home.php

class home extends Controller {函数索引(){父::控制器();}函数所有用户(){$this->load->model('User');$result = $this->User->showusers();如果 ($result->num_rows()>0) {foreach ($result as $row) {echo "ID:".$row->userid." ".$row->userpenname."<br/>";echo $row->userfirstname." ".$row->userlastname."<br/>";}}}}

显示错误:

遇到一个 PHP 错误严重性:注意消息:未定义的属性:User::$db文件名:models/user.php行号:30

致命错误:在
G:xampphtdocsfiksisystemapplicationmodelsuser.php 中第 30 行的非对象上调用成员函数 query()

第 30 行见上面的评论...

解决方案

您必须先加载 db 库.在 autoload.php 中添加:

$autoload['libraries'] = array('database');

另外，尝试将用户模型类重命名为User_model".

I am new to codeigniter model, i try to follow steps in docs to load all user registered in my db.

This is my model: user.php

class User extends Model {
     function user() {
         parent::Model();
     }
     function alluser() {
         $query = $this->db->query("select * from user limit 0,5"); //Line 30 error as in my IDE located in this line
         return $query->result();
     }
}

This is my controller: home.php

class home extends Controller {

function index() {

    parent::Controller();

}
function alluser() {
    $this->load->model('User');
    $result = $this->User->showusers();
    if ($result->num_rows()>0) {
        foreach ($result as $row) {
            echo "ID:".$row->userid." ".$row->userpenname."<br />";
            echo $row->userfirstname." ".$row->userlastname."<br />";
        }
      }
   }
}

it showing error:

A PHP Error was encountered

Severity: Notice

Message: Undefined property: User::$db

Filename: models/user.php

Line Number: 30

Line 30 see comment above...

解决方案

You have to load the db library first. In autoload.php add :

$autoload['libraries'] = array('database');

Also, try renaming User model class for "User_model".

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