Learning php - How to query the database from logged_in.php? - php

Question

Im trying to learn php and have set up a login system using php-login.net (advanced script). The script uses an index.php file to check if the user is logged in (via login.php)
Within login.php, the script uses a function "databaseConnection" to connect to the database as
$this->db_connection = new PDO('mysql:host='. DB_HOST .';dbname='. DB_NAME . ';charset=utf8', DB_USER, DB_PASS);
An example query is executed as:
$query = $this->db_connection->prepare('UPDATE users SET username = :user_name WHERE user_id = 1');
$query ->bindValue(':user_name ', $user_name , PDO::PARAM_STR);
$query ->execute();
if ($query_update->rowCount() == 0) {
// Something here
} else {
// Something else here
}
index.php checks if the user is logged in and if logged in, loads logged_in.php
My question is: How do I select something from the database within logged_in.php. Should i create a new db connection? If so how. I cannot reference $this->db_connection->prepare within logged_in.php
Also, what's a good source to learn step by step. I tried http://php.net/manual/ but that isnt making sense to me.
Thank you!

Answer 1

use php frameworks. so that it is fast and easy. Here login controller ive used in codeigniter framework
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Login extends CI_Controller {
public function __construct(){
parent::__construct();
$this->load->model('login_model', 'lm');
$this->load->model('posts_model', 'pm');
date_default_timezone_set('Asia/Hong_Kong');
}
//check password in the database
public function check_database($password){
$username = $this->input->post('username');
$result = $this->lm->login($username, $password);
if($result){
$sess_array = array();
foreach($result as $row){
$sess_array = array(
'id'=>$row->user_id,
'username'=>$row->username,
);
$this->session->set_userdata('loggedIn', $sess_array);
}
return true;
}else{
$this->form_validation->set_message('check_database', 'Invalid Username or Password.');
return false;
}
}
public function auth(){
$this->form_validation->set_rules('username', 'Username', 'trim|required|xss_clean');
$this->form_validation->set_rules('password', 'Password', 'trim|required|xss_clean|callback_check_database');
if($this->form_validation->run() == FALSE){
$this->index();
}else{
redirect('post');
}
}
public function index(){
$data['title'] = "Login here | OkDito.ph Cebu's # 1 Buy and Sell Website";
$data['great_deals'] = $this->pm->greatdeals();//get all items
$data['getAllPendingPosts'] = $this->pm->getAllPendingPosts();
$tmp_pending = array();
$tmp_pending = $data['getAllPendingPosts'];
if(!empty($tmp_pending )){
$pending = 1;
}
else{
$pending = 0;
}
$data['pending'] = $pending;
if($this->session->userdata('loggedIn')){
$login = $this->session->userdata('loggedIn');
if(!empty($login)){
redirect('post');
}
}
else{
$this->template_lib->set_view('index_view', 'login_view', $data,'',$data);
}
}
}
model
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/*
* User library for the Model..all commonly used functions should be placed here
* #author: team gabayan
* #created: 7/1/11
*/
class Login_model extends CI_Model{
//check if email exist in the database
public function email($email){
$this->db->select(
'tbl_users.email'
)
->from('tbl_users')
->where('email', $email);
$q = $this->db->get();
if($q->num_rows() == 1){
return $q->result();
}else{
return false;
}
}
Here. Hope this helps
public function login($username, $password){
$sha_password = sha1($password);
$this->db->select(
'tbl_users.user_id,
tbl_users.username,
tbl_users.password,
tbl_users.status
'
)
->from('tbl_users')
->where('tbl_users.username', $username)
->where('tbl_users.password', $sha_password);
$query = $this->db->get();
if($query->num_rows() == 1){
return $query->result();
}else{
return false;
}
}
}//endclass
/End of File Login_model.php/
/File Location: ./application/models/login_model.php/