https://blog.youkuaiyun.com/koastalzh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/koastal/article/details/112850316https://blog.youkuaiyun.com/koastal/article/details/112850316koastalTue, 19 Jan 2021 19:27:21 +0800https://blog.youkuaiyun.com/koastal/article/details/83116404https://blog.youkuaiyun.com/koastal/article/details/83116404koastalWed, 17 Oct 2018 19:39:30 +0800https://blog.youkuaiyun.com/koastal/article/details/80668260https://blog.youkuaiyun.com/koastal/article/details/80668260koastalTue, 12 Jun 2018 17:15:13 +0800https://blog.youkuaiyun.com/koastal/article/details/79166351https://blog.youkuaiyun.com/koastal/article/details/79166351koastalThu, 25 Jan 2018 20:34:30 +0800https://blog.youkuaiyun.com/koastal/article/details/78995885https://blog.youkuaiyun.com/koastal/article/details/78995885koastalSun, 07 Jan 2018 21:59:11 +0800 0){ //用户抢购成功，记录用户信息 $num--; } 假设在一个并发量较高的场景，数据库中num的值为1时，可能同时会有多个进程读取到num为1，程序判断符合条件，抢购成功，num减一。这样会导致商品超发的情况，本来只有10件可以抢购的商品，可能会有超过10个人抢到，此时num]]>https://blog.youkuaiyun.com/koastal/article/details/78984569https://blog.youkuaiyun.com/koastal/article/details/78984569koastalFri, 05 Jan 2018 19:36:47 +0800 head> meta charset="utf-8"> meta http-equiv="X-UA-Compatible" content="IE=edge"> meta name="viewport" content="width=device-wid]]>https://blog.youkuaiyun.com/koastal/article/details/78794275https://blog.youkuaiyun.com/koastal/article/details/78794275koastalWed, 13 Dec 2017 17:22:13 +0800https://blog.youkuaiyun.com/koastal/article/details/78789943https://blog.youkuaiyun.com/koastal/article/details/78789943koastalWed, 13 Dec 2017 12:25:55 +0800https://blog.youkuaiyun.com/koastal/article/details/78771932https://blog.youkuaiyun.com/koastal/article/details/78771932koastalMon, 11 Dec 2017 13:52:19 +0800https://blog.youkuaiyun.com/koastal/article/details/78767484https://blog.youkuaiyun.com/koastal/article/details/78767484koastalSun, 10 Dec 2017 21:04:50 +0800https://blog.youkuaiyun.com/koastal/article/details/78765101https://blog.youkuaiyun.com/koastal/article/details/78765101koastalSun, 10 Dec 2017 15:35:08 +0800https://blog.youkuaiyun.com/koastal/article/details/78749211https://blog.youkuaiyun.com/koastal/article/details/78749211koastalFri, 08 Dec 2017 10:51:32 +0800https://blog.youkuaiyun.com/koastal/article/details/78737543https://blog.youkuaiyun.com/koastal/article/details/78737543koastalThu, 07 Dec 2017 20:56:51 +0800https://blog.youkuaiyun.com/koastal/article/details/78692445https://blog.youkuaiyun.com/koastal/article/details/78692445koastalSat, 02 Dec 2017 01:36:32 +0800 单位： {{i]]>https://blog.youkuaiyun.com/koastal/article/details/78660677https://blog.youkuaiyun.com/koastal/article/details/78660677koastalTue, 28 Nov 2017 23:57:21 +0800 https://blog.youkuaiyun.com/koastal/article/details/78575116https://blog.youkuaiyun.com/koastal/article/details/78575116koastalSun, 19 Nov 2017 16:30:20 +0800https://blog.youkuaiyun.com/koastal/article/details/78512670https://blog.youkuaiyun.com/koastal/article/details/78512670koastalSun, 12 Nov 2017 16:32:06 +0800https://blog.youkuaiyun.com/koastal/article/details/77852482https://blog.youkuaiyun.com/koastal/article/details/77852482koastalTue, 05 Sep 2017 15:54:02 +0800https://blog.youkuaiyun.com/koastal/article/details/77836230https://blog.youkuaiyun.com/koastal/article/details/77836230koastalMon, 04 Sep 2017 12:39:16 +0800https://blog.youkuaiyun.com/koastal/article/details/77750905https://blog.youkuaiyun.com/koastal/article/details/77750905koastalThu, 31 Aug 2017 23:56:59 +0800