provision.py 文件源码

def __call__(self, cfg, *arg):
        if isinstance(cfg, compat.string_types):
            url = sa_url.make_url(cfg)
        elif isinstance(cfg, sa_url.URL):
            url = cfg
        else:
            url = cfg.db.url
        backend = url.get_backend_name()
        if backend in self.fns:
            return self.fns[backend](cfg, *arg)
        else:
            return self.fns['*'](cfg, *arg)