数据编号+1 并发问题解决

        //正常写法,获取最后一条数据，新的单据编号+1，有并发问题
        $last = Article::orderByDesc('id')->first();
        $data = [
            'code'    => $last->code + 1,
        ];
        $article = Article::create($data);

        //---------------------------------------------------------------------------------//
        //解决并发问题  测试ab -t 6 -c 20 http://study.local/xxx
        DB::beginTransaction();
        $last = Article::lockForUpdate()->orderByDesc('id')->first();
        $data = [
            'code'    => $last->code + 1,
        ];
        $article = Article::create($data);
        DB::commit();

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