execute mysql stored procedure

hallo..

i've a stored procedure. when i run it in my admin page, it gave me a results. But when i executed it from my Model, it gave me an empty result.

Here is my code to execute it :

public function get_data($id, $id_sub){

$sql_query=$this->db->query("call sp_get_deep('".$id."','".$id_sub."')");     //--> Give me an empty result.
    mysqli_next_result( $this->db->conn_id);
            if($sql_query->num_rows()==1){
                return $sql_query->row_array();
            }
}

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