thinkphp 多表事务处理

try{
    $this->user = D('User');
    $this->user->startTrans(); //开始事务
	$res = $this->user->Saveuser($where,$data);
	$res1 = $this->user->Saveuser($where,$data);
	if(!$res||!$res1){
		throw new \Exception('数据实例化失败'); 
	}
	$this->user->commit(); //确认事务
}catch(\Exception $e){
	$this->user->rollback(); //回滚

}
try{
    $this->user = D('User');
    $this