function db_connect($config){
	mongo::$server = "mongodb://".$config['host'];
	mongo::$options = array('db'=>$config['db']);
	return new \tp\mongo\db(); //想法静态吧。演示就不写了。
}

function pager($tb,$par = []){
	$url = $par['url']?:'/posts';
	$size = $par['size']?:10;
	$condition = $par['condition']?:[];
	unset($par['url'],$par['size'],$par['condition']);

	$count = modb($tb)
	->count($condition);

	$pageArray =  \tp\helpers\paginate($url,$count,$size);
	$data['pager'] = $pageArray['link'];
	$mo = modb($tb)
	->find($condition);

	if($par){
		foreach ($par as $k=>$v){
			$mo = $mo->$k($v);
		}
	}
	$mo = $mo->skip($pageArray['offset']);
	$mo = $mo->limit($size);
	$data['datas'] = $mo;
	$data['count'] = $count;
	return $data;
}