Unique field in codeigniter - php

Question

I need to make Unique Serial number SN in my form. I've tried to do it, but I can't understand how this function works. Please explain clearly as I'm new to programming with codeigniter
view:my view (form)
Branch: <input type="text" name="branch" /><br/>
Business Unit: <input type="text" name="buinessUnit" /><br/>
Device Type: <input type="text" name="deviceType" /><br/>
Brand: <input type="text" name="brand" /><br/>
Device Model: <input type="text" name="deviceModel" /><br/>
SN: <input type="text" name="SN" /><br/> //that i need unique
status: <input type="text" name="status" /><br/>
department: <input type="text" name="department" /><br/>
username: <input type="text" name="username" /><br/>
notes: <input type="textarea" name="notes" /><br/>
computername: <input type="text" name="computerName" /><br/>
Save:<input type="submit" name="save" />
</form>
</body>
</html>
model:to insert data into database
<?php
class add_model extends CI_Model {
public function insert_into_db(){
$post=$this->input->post();
//insert data with query builder
$data=array('Branch'=>$post['branch'],'BusinessUnit'=>$post['buinessUnit'],'DeviceType'=>$post['deviceType'],'Brand'=>$post['brand'],'DeviceModel'=>$post['deviceModel'],'SN'=>$post['SN'],'Status'=>$post['status'],'Departmant'=>$post['department'],'UserName'=>$post['username'],'Notes'=>$post['notes'],'ComputerName'=>$post['computerName']);
$this->db->insert('hardware_assets', $data);
return $this->db->insert_id(); // if using mysql
}
}
controller:to handle model and view
<?php
class Speed extends CI_Controller {
function insert_to_db()
{
$this->load->helper(array('form', 'url'));
$this->load->library('form_validation');
$this->form_validation->set_rules('branch', 'Branch', 'trim|required|xss_clean');
$this->form_validation->set_rules('buinessUnit', 'BuinessUnit', 'trim|required|xss_clean');
$this->form_validation->set_rules('deviceType', 'DeviceType', 'trim|required|xss_clean');
$this->form_validation->set_rules('brand', 'Brand', 'trim|required|xss_clean');
$this->form_validation->set_rules('deviceModel', 'DeviceModel', 'trim|required|xss_clean');
$this->form_validation->set_rules('SN', 'SN', 'trim|required|xss_clean');
$this->form_validation->set_rules('status', 'Status', 'trim|required|xss_clean');
$this->form_validation->set_rules('department', 'Department', 'trim|required|xss_clean');
$this->form_validation->set_rules('username', 'Username', 'trim|required|xss_clean|callback_username_check');
$this->form_validation->set_rules('notes', 'Notes', 'trim|required|xss_clean');
$this->form_validation->set_rules('computerName', 'ComputerName', 'trim|required|xss_clean');
/*
*/
if ($this->form_validation->run() == FALSE)
{
$this->load->view('pages/home');
}
else
{
$this->load->model('add_model');
$this->add_model->insert_into_db();
$this->load->view('pages/home');//loading success view
//$this->load->view('pages/formsuccess');
}
}
// public function username_check($str)
// {
// if ($str == 'test')
// {
// $this->form_validation->set_message('username_check', 'The %s field can not be the word "test"');
// return FALSE;
// }
// else
// {
// return TRUE;
// }
// }
}

Answer 1

check the link.
instead of user_name use serial no. it will work for both insert and update.

Answer 2

Replace Your this line,
$this->form_validation->set_rules('SN', 'SN', 'trim|required|xss_clean');
With,
$this->form_validation->set_rules('SN', 'SN', 'trim|required|xss_clean|is_unique[hardware_assets.SN]');

Answer 3

If you create your Own Function for UNIQUE SN then Used three Thing
$date = date("ymdhis");
$SD = rand(10,2000);
$ID =$this->db->insert_id();
$SN = $ID.SD.$date;

Answer 4

For Making Your Custom validation please add a file in your library folder my_form_validation.php as you can modify this function or create new one as per your requirement,
<?php
class MY_Form_validation extends CI_Form_validation {
//used to check unique value at update record
function unique($value, $params) {
$CI = & get_instance();
$CI->load->database();
$CI->form_validation->set_message('unique', 'The %s is already taken.');
list($table, $field, $id_field, $id) = explode(".", $params, 4);
$data = $CI->db->select($field)->from($table)
->where($field, $value)
->where($id_field . " != ", $id)
->get()->num_rows();
if ($data) {
return FALSE;
} else {
return TRUE;
}
}
}
?>