Question

class Registration_model extends CI_Model {

    function __construct() {
        parent::__construct();
    }   

    function check_email_availability($email)
    {
        $sql = "CALL proc_1301('$email');"; 
        $query = $this->db->query($sql) or die(mysql_error()); 
        return $query->row_array();
    }

    function check_username_availability($username)
    {
        $sqlt = "CALL proc_1303('$username');"; 
        $query = $this->db->query($sqlt) or die(mysql_error()); 
        return $query->row_array();
    }

    function process_registration($username, $email, $password)
    { 
        $sql = "CALL `proc_1302`('$username', '$email', '$password');"; 
        $query = $this->db->query($sql) or die(mysql_error()); 
        return $query->result_array();   
    }

this is my controller code which calls three functions from model one by one:

$emailCheckRes = $this->Registration_model->check_email_availability($email); 
$usernameCheckRes = $this->Registration_model->check_username_availability($username); 
$this->data['regRes'] = $this->Registration_model->process_registration($username, $email, $password);

my problem is when i run only one function it runs successfully but when i run two of them or all three it shows blank page… any idea why ???

SOLUTION

So finally the only solution we got for my own problem is :

/* ADD THIS FUNCTION IN SYSTEM/DATABASE/DB_ACTIVE_REC */
/* USAGE $this->db->freeDBResource($this->db->conn_id); */
function freeDBResource($dbh){
    while(mysqli_next_result($dbh)){
            if($l_result = mysqli_store_result($dbh)){
              mysqli_free_result($l_result);
            }
        }
}

Answer 1

The problem is related to CodeIgniter’s active recors and multiple database stored procedure calling.

First of all check that dbdriver parameter (application/config/database.php) is set to mysqli.
Then, as described in “Calling a stored procedure from CodeIgniter’s Active Record class” question on StackOverflow, adding to system/database/DB_active_rec.php the following function:

function freeDBResource($dbh){
    while(mysqli_next_result($dbh)){
            if($l_result = mysqli_store_result($dbh)){
              mysqli_free_result($l_result);
            }
        }
}

..And in your controller use:

$this->db->freeDBResource($this->db->conn_id);

after any stored procedure calling.