$userid=trim($_POST['userid']);
$pay = M('businessinfo','ws_','DB_app');
$sc = M('businesses',"jy_",'DB_shdl');
$business = M('businesses',"jy_",'DB_dl');
$userInfo=$pay->where("userid=".$userid)->select();
for($i=0;$i<count($userInfo);$i++){
$businessInfo=$business->getByBusinessnum($userInfo[$i]['businessid']);
$userInfo[$i]['businessNane']=$businessInfo['businessname'];
}

同时操作多个数据库就无法切换，倒是获取到的模型不正确