form validation as well as db error - php

Question

I'm getting an error on form validation as well as db error. When I remove form validation the db query works perfectly fine. I have no idea what the error is and how to solve it.
A PHP Error was encountered
Severity: Notice
Message: Undefined offset: 1
Filename: libraries/Form_validation.php
Line Number: 953
A Database Error Occurred
Error Number: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE ` = 'admin' LIMIT 1' at line 2
SELECT * WHERE ` = 'admin' LIMIT 1
Filename: C:\wamp\www\myblog.com\system\database\DB_driver.php
Line Number: 330
[Controller: myblog]
class Myblog extends CI_Controller {
public function __construct()
{
parent::__construct();
$this->load->model('blogmodel');
}
public function login()
{
$this->load->view('header');
$this->load->view('login');
$this->load->view('footer');
}
public function login_check()
{
$user=$this->input->post("username");
$pass=$this->input->post("password");
$this->form_validation->set_rules('username', 'Username', 'trim|required|is_unique');
$this->form_validation->set_rules('password', 'Password', 'trim|required|min_length[4]|max_length[32]');
if($this->form_validation->run()==true)
{
$this->blogmodel->checklogin($user,$pass);
$this->load->view('header');
$this->load->view('logsuccess');
$this->load->view('footer');
}
else
{
$this->load->view('header');
$this->load->view('login');
$this->load->view('footer');
}
}
public function reg()
{
$this->form_validation->set_rules('username', 'Username', 'trim|required|is_unique');
$this->form_validation->set_rules('password', 'Password', 'trim|required|min_length[4]|max_length[32]');
if($this->form_validation->run()==true)
{
$user=$this->input->post("username");
$pass=$this->input->post("password");
$this->blogmodel->register($user,$pass);
$this->load->view('header');
$this->load->view('regsuccess');
$this->load->view('footer');
}
else
{
redirect('myblog/login');
}
}
[Model: blogmodel]
class Blogmodel extends CI_Model {
function __construct() {
parent::__construct();
}
function checklogin($user,$pass)
{
$this->db->select('username, password');
$this->db->from('user');
$this->db->where('username', $user);
$this->db->where('password', MD5($pass));
$this->db->limit(1);
$query = $this->db->get();
if($query->num_rows() == 1) {
return $query->result();
} else {
redirect('myblog/login');
}
}
function register($user,$pass)
{
$new_member=array(
'username' => $user,
'password' => md5($pass),
'status' =>1
);
$insert = $this->db->insert('user', $new_member);
return $insert;
}
[View:login]
echo "<h2>Register</h2>";
echo validation_errors();
echo form_open('myblog/reg');
echo form_label("Username: ");
echo form_input("username");
?><br/>
<?php
echo form_label("Password: ");
echo form_password("password");
?><br/>
<?php
echo form_label("Confirm Password: ");
echo form_password("password2");
?><br/>
<?php
echo form_submit("","Register");
echo form_close();
echo "<h2>Login</h2>";
echo validation_errors();
echo form_open('myblog/login_check');
echo form_label("Username: ");
echo form_input("username");
?><br/>
<?php
echo form_label("Password: ");
echo form_password("password");
?><br/>
<?php
echo form_submit("","Login");
echo form_close();

Answer 1

My guess is because you haven't set a table or row in your form validation.
Change this line, in your Controller;
$this->form_validation->set_rules('username', 'Username', 'trim|required|is_unique');
to this;
$this->form_validation->set_rules('username', 'Username', 'trim|required|is_unique[users.username]');
As you'll see, I've added [users.username] to the is_inque rule. Without it, CI doesn't know what to compare it to.

Answer 2

The SQL Statement is missing the table and column to check
SELECT * FROM table WHERE column = 'admin' LIMIT 1

Answer 3

SQL syntax incorrect.
Your incomplete sql statement indicates that you want to fetch a COLUMN VALUE from a TABLE that contains the values of your Username.
So.include an appropriate Column name and table name,
Syntax:
Select * from table_name where column_name='admin' Limit 1;