{"id":4126,"date":"2019-04-18T19:02:00","date_gmt":"2019-04-18T11:02:00","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4126"},"modified":"2019-04-18T19:02:00","modified_gmt":"2019-04-18T11:02:00","slug":"%e9%9d%a2%e8%af%95%e5%bf%85%e9%97%ae%e7%9a%84%e5%85%b3%e4%ba%8e%e5%95%86%e5%93%81%e8%b6%85%e4%b9%b0%e9%97%ae%e9%a2%98%e7%9a%84%e8%a7%a3%e5%86%b3%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4126","title":{"rendered":"\u9762\u8bd5\u5fc5\u95ee\u7684\u5173\u4e8e\u5546\u54c1\u8d85\u4e70\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u524d\u4e24\u5929\u5199\u7684\u6587\u7ae0\uff0c\u5728\u7fa4\u91cc\u88ab\u5e7f\u6cdb\u8ba8\u8bba\u3002\u6709\u4eba\u63d0\u51fa\u4e86\u8ba9\u6211\u5199\u4e00\u5199\u5982\u4f55\u89e3\u51b3\u5546\u54c1\u8d85\u5356\u95ee\u9898\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u95ee\u9898\u771f\u662f\u8001\u751f\u5e38\u8c08\uff0c\u4e0d\u6b62\u662f\u79d2\u6740\uff0c\u62a2\u8d2d\u4e2d\u624d\u6709\u8d85\u5356\u95ee\u9898\uff0c\u5c31\u662f\u4e00\u4e2a\u666e\u901a\u7684\u5546\u54c1\uff0c\u5728\u5e76\u53d1\u65f6\u4e5f\u6709\u53ef\u80fd\u53d1\u751f\u8d85\u5356\u3002\u90a3\u4e48\u8be5\u5982\u4f55\u89e3\u51b3\u5462\uff1f\u529e\u6cd5\u5f88\u7b80\u5355\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u8bf4\u6211\u7684\u7b2c\u4e00\u4e2a\u89e3\u51b3\u529e\u6cd5\uff0c\u7ed9\u5e93\u5b58\u5b57\u6bb5\u6dfb\u52a0 unsigned \u5b57\u6bb5\uff0c\u8ba9\u5e93\u5b58\u975e\u8d1f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u6211\u6267\u884c\u4e0b\u9762\u7684 SQL \u65f6\uff0c\u6211\u5c31\u662f\u8ba9\u4f60\u7a0b\u5e8f\u4ee3\u7801\u51fa\u73b0\u5f02\u5e38\uff0c\u4e5f\u4e0d\u8ba9\u4f60\u53d1\u751f\u8d85\u5356\u95ee\u9898\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>update xttblog set sku_quantity = sku_quantity - 10 where id = 888;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f\u4e00\u79cd\u6700\u6709\u6548\uff0c\u4e5f\u662f\u6700\u7b28\u7684\u529e\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u662f\uff0c\u73b0\u5b9e\u662f\uff0c\u6211\u4eec\u7684\u5546\u54c1\uff0c\u81f3\u5c11\u662f\u70ed\u95e8\u5546\u54c1\uff0c\u4e00\u822c\u90fd\u653e\u5728 Redis \u4e2d\u3002\u5982\u679c\u76f4\u63a5\u64cd\u4f5c\u6570\u636e\u5e93\uff0c\u90a3\u4e48 DB \u7684\u5199\u538b\u529b\u4f1a\u975e\u5e38\u7684\u5927\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\uff0c\u6211\u4eec\u8fd9\u4e2a\u65f6\u5019\uff0c\u53ef\u4ee5\u501f\u52a9 Redis \u7684\u52a0\u9501\u65b9\u5f0f\u89e3\u51b3\u8d85\u5356\u95ee\u9898\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@RequestMapping(value = \"\/seckill\", method = RequestMethod.GET)\npublic String seckill() {\n    RLock rLock = redissonClient.getLock(\"product_sku\");\n    try {\n        rLock.lock();\n        Integer sku = Integer.parseInt(\n            stringRedisTemplate.opsForValue().get(\"product_sku\")\n        );\n        sku = sku - 1;\n        if (sku &lt; 0) {\n            return \"\u5e93\u5b58\u4e0d\u8db3\";\n        }\n        stringRedisTemplate.opsForValue().set(\"product_sku\", sku.toString());\n        return \"\u51cf\u5c11\u5e93\u5b58\u6210\u529f,\u5171\u51cf\u5c11\" + successNum.incrementAndGet();\n    } finally {\n        rLock.unlock();\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9664\u6b64\u4e4b\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u89e3\u51b3\u961f\u5217\u3001\u9650\u6d41\u7b49\u6280\u672f\u6765\u4e00\u8d77\u914d\u5408\u4f7f\u7528\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/qiurunze123\/imageall\/master\/miaosha.png\" alt=\"\" \/><figcaption>\u5546\u54c1\u8d85\u5356\u95ee\u9898<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u77e5\u9053\u8fd9\u4e2a\u56fe\u5927\u5bb6\u8fd8\u8bb0\u5f97\u4e0d\u3002\u597d\u719f\u6089\u5427\uff0c\u4ee5\u524d\u5206\u4eab\u8fc7\u7684\u3002\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u5927\u5bb6\u53ef\u4ee5\u81ea\u5df1\u8bd5\u4e00\u8bd5\uff0c\u4f7f\u7528 Jemter \u538b\u6d4b\u4e00\u4e0b\u3002\u5982\u679c\u540e\u9762\u6709\u65f6\u95f4\uff0c\u6211\u4e5f\u53ef\u4ee5\u7ed9\u5927\u5bb6\u76f4\u64ad\uff0c\u6d4b\u8bd5\u6d4b\u8bd5\u4e0a\u9762\u7684\u4ee3\u7801\u662f\u5426\u771f\u7684\u89e3\u51b3\u4e86\u8d85\u5356\u95ee\u9898\u3002<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=4126\">\u9762\u8bd5\u5fc5\u95ee\u7684\u5173\u4e8e\u5546\u54c1\u8d85\u4e70\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u524d\u4e24\u5929\u5199\u7684\u6587\u7ae0\uff0c\u5728\u7fa4\u91cc\u88ab\u5e7f\u6cdb\u8ba8\u8bba\u3002\u6709\u4eba\u63d0\u51fa\u4e86\u8ba9\u6211\u5199\u4e00\u5199\u5982\u4f55\u89e3\u51b3\u5546\u54c1\u8d85\u5356\u95ee\u9898\uff1f \u8fd9\u4e2a\u95ee\u9898\u771f\u662f\u8001\u751f\u5e38\u8c08\uff0c\u4e0d\u6b62\u662f\u79d2\u6740 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[83,669,1752,1694,502],"class_list":["post-4126","post","type-post","status-publish","format-standard","hentry","category-java","tag-mysql","tag-redis","tag-1752","tag-1694","tag-502"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4126","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4126"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4126\/revisions"}],"predecessor-version":[{"id":4127,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4126\/revisions\/4127"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4126"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}