foreach($this->extensions as $ext) {
$scls = ucfirst($dbtype). $ext;
$cls = __CLASS__ . '_'. $scls;
$fn = implode('/',explode('_', $cls)).'.php';
foreach($this->extensions as $ext) {
$scls = ucfirst($dbtype). $ext;
$cls = __CLASS__ . '_'. $scls;
$fn = implode('/',explode('_', $cls)).'.php';