public function db()
{
$this->_clear_runtime();
if (strtolower(C("DB_TYPE")) == 'mysql') {
//$this->mysql();
echo 'ShowDoc does not support mysql any more . http://www.showdoc.cc/help?page_id=31990 ';
} elseif (strtolower(C("DB_TYPE")) == 'sqlite') {
$this->sqlite();
}
$this->_clear_runtime();
}