webman 怎么支持事务

DB::beginTransaction();
try{
    Db::table('xxx')->xxxx;
    Db::table('xxx')->xxxx;
    DB::commit();//提交至数据库
}catch(\Exception $exception){
    DB::rollback();//数据库回滚
}

Db::connection()->beginTransaction();
try{
    Db::table('xxx')->xxxx;
    Db::table('xxx')->xxxx;
    Db::connection()->commit();//提交至数据库
}catch(\Exception $exception){
    Db::connection()->rollback();//数据库回滚
}