- require $this->app_file("data/impl/mw_".$this->bdd("sgbd").".php");
- if(class_exists($sgbd_impl = "mw_".$this->bdd("sgbd"))){
+ $sgbd_impl = "mw_".$this->bdd("sgbd");
+ if(!class_exists($sgbd_impl)) require_once $this->app_file("data/impl/".$sgbd_impl.".php");
+ if(class_exists($sgbd_impl)){