laravel记录

1.使用数据库事务的时候需要传递参数，使用了use关键字，否则的话传递不进去，代码如下：

    public function postVote(Request $request){
        $data = $request->all();
        $count = DB::table("vote")->where("workdid",$data[‘id‘])->where("ip", $data[‘ip‘])->count();

        if(DB::table("vote")->where("workdid",$data[‘id‘])->where("ip", $data[‘ip‘])->count()>0){
            $ret = [‘state‘ => ‘fail‘, ‘message‘ => ‘您已经给这个作品投过一票！‘];
        }else{
            DB::transaction(function () use($data){
                DB::table("work")->where("id", $data["id"])->increment("vote");
                DB::table("vote")->insert(["workdid"=>$data["id"], "ip"=>$data[‘ip‘]]);
            });
            $ret = [‘state‘ => ‘success‘, ‘message‘ => ‘投票成功‘];
        }
        return response()->json($ret);
    }