CodeIgniter - 调用非对象上的成员函数select（） [英] CodeIgniter - Call to a member function select() on a non-object

问题描述

我是CodeIgniter的新手。这是我的代码：

I'm quite new to CodeIgniter. This is my code:

class User_model extends CI_Model {

    function validate_user() {

        $this->db->select('*');
        $this->db->from('user');
        $this->db->where('username', $this->input->post('username'));
        $this->db->where('password', md5($this->input->post('password')));
        $validate_user = $this->db->get();

        if($validate_user->num_rows == 1) {
            return TRUE;
        }
    }
}

错误在我的模型文件中：

I'm, receiving this error in my model file:

Call to a member function select() on a non-object

目前我使用的是CodeIgniter 2.1.0版。请帮助我！

Currently I'm using CodeIgniter version 2.1.0. Please help me!

推荐答案

我认为你必须加载数据库库。第一种方式是在应用程序中包含数据库/ config / autoload.php

I think that you have to load the "database" library. The first way is to include the "database" in your application/config/autoload.php

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

或在您的类构造函数中：

or in your class constructor:

class User_model extends CI_Model { 

     public function __construct() 
     {
           parent::__construct(); 
           $this->load->database();
     }
}

您可以在这里获得更多信息：http://ellislab.com/codeigniter/user_guide/database/connecting.html

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