用的是sqlserver数据库，在Db::startTrans(); 就直接报错，导致catch的时候DB:rollback报错：There is no active transaction。
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try{
//Db::startTrans();
Db::table($this->tableName)->insert($postData);
$this->addTravelDetails($postData);
//Db::commit();
return $this->responseSuccess($postData);
}catch (\Exception $exception){
//Db::rollback();
return $this->responseFail('保存失败，请重试！', $exception);
}