[英]Codeigniter error select query fails to check user input
我是Codeigniter的新手,正在使用3.1.5版本。 以下是我的用戶登錄功能。
class Auth extends CI_Controller
{
public function login()
{
// Load Login View
$this->load->view('login');
// validate form
$this->form_validation->set_rules('username','Username','required');
$this->form_validation->set_rules('password','Password','required|min_length[5]');
if($this->form_validation->run()== true){
$username = $_POST['username'];
$password = $_POST['password'];
// check user in database
$this->db->select("*");
$this->db->from("users");
$this->db->where(array("username"=>$username,"password"=>$password));
$query = $this->db->get();
$user_data = $query->row();
// check if user exists or not
if($user_data->username){
// show temporary success message
$this->session->set_flashdata("success","User successfully logged in");
// set temporary sesstion variables
$_SESSION['user_logged'] = TRUE;
$_SESSION['username'] = $user_data->username;
}else{
$this->session->set_flashdata("error","Invalid username, user not exist");
}
}
}
當我提供用戶名(如用戶名和密碼)時,出現以下錯誤,無法解決。
Severity: Notice
Message: Trying to get property of non-object
Filename: controllers/Auth.php
Line Number: 29
Backtrace:
File: D:\xampp\htdocs\ci315\application\controllers\Auth.php
Line: 29
Function: _error_handler
File: D:\xampp\htdocs\ci315\index.php
Line: 315
Function: require_once
行號29正是從這里開始
if($user_data->username){
// show temporary success message
$this->session->set_flashdata("success","User successfully logged in");
// set temporary sesstion variables
$_SESSION['user_logged'] = TRUE;
$_SESSION['username'] = $user_data->username;
}else{
$this->session->set_flashdata("error","Invalid username, user not exist");
}
如果我評論以上部分,則沒有錯誤。 請建議我在哪里做錯了。 任何幫助將不勝感激,在此先感謝。
在下面的代碼中使用可以正常工作。 使用if($ query-> num_rows()> 0)代替if($ user_data-> username)和$ query-> row()-> username代替$ user_data-> username
class Auth extends CI_Controller
{
public function login()
{
// Load Login View
$this->load->view('login');
// validate form
$this->form_validation->set_rules('username','Username','required');
$this->form_validation->set_rules('password','Password','required|min_length[5]');
if($this->form_validation->run()== true){
$username = $_POST['username'];
$password = $_POST['password'];
// check user in database
$this->db->select("*");
$this->db->from("users");
$this->db->where(array("username"=>$username,"password"=>$password));
$query = $this->db->get();
if($query->num_rows() > 0){
// show temporary success message
$this->session->set_flashdata("success","User successfully logged in");
// set temporary sesstion variables
$_SESSION['user_logged'] = TRUE;
$_SESSION['username'] = $query->row()->username;
}else{
$this->session->set_flashdata("error","Invalid username, user not exist");
}
}
}
}
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