php - Call to undefined method CI_DB_mysql_driver::get_compiled_select()? -


i've following sql active record query giving error. have inner select queries why tried use method found on google it's giving error get_complied_select not defined. how solve error or there other better way write following queries? thanks!

        $this->db->select('id_dem');     $this->db->from('dem_demos');     $this->db->where('id_dem in (".implode("," ,$id_v).") or maindemo_dem in (".implode(",",$id_v).")');     $innermost_query = $this->db->get_compiled_select();      $this->db->select('count(demo_vis) tot_visits');     $this->db->from('sta_views');     $this->db->where('countvisit_wis != "n" , demo_vis in $innermost_query , date_vis between      ".$date_s." , ".$date_e."');     $first_query = $this->db->get_compiled_select();      $this->db->select('count(demo_vis) tot_visits');     $this->db->from('sta_views');     $this->db->where('countvisit_wis != "n"                   , demo_vis in $innermost_query , date_vis between ".$date_s." , ".$date_e." ,                    invited_vis = 0');     $second_query = $this->db->get_compiled_select();      $this->db->select('count(demo_vis) tot_visits');     $this->db->from('sta_views');     $this->db->where('countvisit_wis != "n"                   , demo_vis in $innermost_query , date_vis between ".$date_s." , ".$date_e." ,                    invited_vis > 0');     $third_query = $this->db->get_compiled_select();      $this->db->select('count(conversion_vis)');     $this->db->from('sta_views');     $this->db->where('countvisit_wis != "n"                   , demo_vis in $innermost_query , date_vis between ".$date_s." , ".$date_e." ,                    invited_vis = 0 , conversion_vis = 1');     $fourth_query = $this->db->get_compiled_select();      $this->db->select('count(buy_vis)');     $this->db->from('sta_views');     $this->db->where('countvisit_wis != "n"                   , demo_vis in $innermost_query , date_vis between ".$date_s." , ".$date_e." ,                    buy_vis = 1');     $fifth_query = $this->db->get_compiled_select();      $this->db->select('count(distinct session_vis) unique_visits');     $this->db->from('sta_views');     $this->db->where('countvisit_wis != "n"                   , demo_vis in $innermost_query , date_vis between ".$date_s." , ".$date_e."');     $sixth_query = $this->db->get_compiled_select();      $query  = $this->db->select('$first_query total_views, $second_query website_views, $third_query demosent_views,     $fourth_query website_conversions, $fifth_query buy_now_clicks, $$sixth_query unique_views');     if ($query->num_rows() > 0){         return $query->row_array();     }else{         return false;     }


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