{"id":125053,"date":"2024-10-25T19:25:29","date_gmt":"2024-10-25T11:25:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/125053\/"},"modified":"2024-10-25T19:25:30","modified_gmt":"2024-10-25T11:25:30","slug":"redis-%e8%85%b3%e6%9c%ac%e7%b7%a8%e5%af%ab%e5%af%a6%e8%b8%90%e4%b8%80%e5%80%8b%e5%ae%8c%e6%95%b4%e7%9a%84%e6%a1%88%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/125053\/","title":{"rendered":"Redis \u8173\u672c\u7de8\u5beb\u5be6\u8e10\u4e00\u500b\u5b8c\u6574\u7684\u6848\u4f8b"},"content":{"rendered":"<h1 id=\"redis-%e8%85%b3%e6%9c%ac%e7%b7%a8%e5%af%ab%e5%af%a6%e8%b8%90%ef%bc%9a%e4%b8%80%e5%80%8b%e5%ae%8c%e6%95%b4%e7%9a%84%e6%a1%88%e4%be%8b-wsLvwubmUh\">Redis \u8173\u672c\u7de8\u5beb\u5be6\u8e10\uff1a\u4e00\u500b\u5b8c\u6574\u7684\u6848\u4f8b<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cRedis \u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u8d8a\u4f86\u8d8a\u53d7\u5230\u958b\u767c\u8005\u7684\u9752\u775e\u3002\u5b83\u4e0d\u50c5\u652f\u6301\u591a\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u9084\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u8173\u672c\u7de8\u5beb\u529f\u80fd\uff0c\u8b93\u958b\u767c\u8005\u80fd\u5920\u5728\u4f3a\u670d\u5668\u7aef\u57f7\u884c\u8907\u96dc\u7684\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u901a\u904e\u4e00\u500b\u5b8c\u6574\u7684\u6848\u4f8b\uff0c\u4ecb\u7d39\u5982\u4f55\u5728 Redis \u4e2d\u7de8\u5beb\u548c\u904b\u884c\u8173\u672c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-redis-%e8%85%b3%e6%9c%ac%ef%bc%9f-wsLvwubmUh\">\u4ec0\u9ebc\u662f Redis \u8173\u672c\uff1f<\/h2>\n<p>Redis \u8173\u672c\u662f\u4f7f\u7528 Lua \u8a9e\u8a00\u7de8\u5beb\u7684\uff0c\u5141\u8a31\u7528\u6236\u5728 Redis \u4f3a\u670d\u5668\u4e0a\u57f7\u884c\u539f\u5b50\u64cd\u4f5c\u3002\u9019\u610f\u5473\u8457\u5728\u8173\u672c\u57f7\u884c\u671f\u9593\uff0c\u5176\u4ed6\u5ba2\u6236\u7aef\u7121\u6cd5\u5c0d\u6578\u64da\u9032\u884c\u4fee\u6539\uff0c\u5f9e\u800c\u4fdd\u8b49\u4e86\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n<h2 id=\"%e6%a1%88%e4%be%8b%e8%83%8c%e6%99%af-wsLvwubmUh\">\u6848\u4f8b\u80cc\u666f<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6b63\u5728\u958b\u767c\u4e00\u500b\u7c21\u55ae\u7684\u96fb\u5b50\u5546\u52d9\u61c9\u7528\uff0c\u4e26\u5e0c\u671b\u5be6\u73fe\u4e00\u500b\u529f\u80fd\uff1a\u7576\u7528\u6236\u8cfc\u8cb7\u5546\u54c1\u6642\uff0c\u6e1b\u5c11\u5eab\u5b58\u6578\u91cf\u4e26\u8a18\u9304\u4ea4\u6613\u3002\u9019\u500b\u904e\u7a0b\u9700\u8981\u78ba\u4fdd\u5eab\u5b58\u6578\u91cf\u4e0d\u6703\u51fa\u73fe\u8ca0\u503c\uff0c\u56e0\u6b64\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 Redis \u8173\u672c\u4f86\u5be6\u73fe\u9019\u4e00\u529f\u80fd\u3002<\/p>\n<h2 id=\"%e6%ad%a5%e9%a9%9f%e4%b8%80%ef%bc%9a%e8%a8%ad%e7%bd%ae-redis-%e7%92%b0%e5%a2%83-wsLvwubmUh\">\u6b65\u9a5f\u4e00\uff1a\u8a2d\u7f6e Redis \u74b0\u5883<\/h2>\n<p>\u9996\u5148\uff0c\u78ba\u4fdd\u4f60\u5df2\u7d93\u5b89\u88dd\u4e86 Redis\u3002\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u547d\u4ee4\u5728\u672c\u5730\u74b0\u5883\u4e2d\u555f\u52d5 Redis \u4f3a\u670d\u5668\uff1a<\/p>\n<pre><code>redis-server<\/code><\/pre>\n<h2 id=\"%e6%ad%a5%e9%a9%9f%e4%ba%8c%ef%bc%9a%e7%b7%a8%e5%af%ab-lua-%e8%85%b3%e6%9c%ac-wsLvwubmUh\">\u6b65\u9a5f\u4e8c\uff1a\u7de8\u5beb Lua \u8173\u672c<\/h2>\n<p>\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u9700\u8981\u7de8\u5beb\u4e00\u500b Lua \u8173\u672c\u4f86\u8655\u7406\u5eab\u5b58\u6e1b\u5c11\u548c\u4ea4\u6613\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u6211\u5011\u7684\u8173\u672c\uff1a<\/p>\n<pre><code>local stock_key = KEYS[1]\nlocal transaction_key = KEYS[2]\nlocal quantity = tonumber(ARGV[1])\n\n-- \u6aa2\u67e5\u5eab\u5b58\nlocal stock = tonumber(redis.call('GET', stock_key))\nif stock == nil then\n    return '\u5eab\u5b58\u4e0d\u5b58\u5728'\nend\n\nif stock &lt; quantity then\n    return &#039;\u5eab\u5b58\u4e0d\u8db3&#039;\nend\n\n-- \u6e1b\u5c11\u5eab\u5b58\nredis.call(&#039;DECRBY&#039;, stock_key, quantity)\n\n-- \u8a18\u9304\u4ea4\u6613\nredis.call(&#039;LPUSH&#039;, transaction_key, quantity)\n\nreturn &#039;\u4ea4\u6613\u6210\u529f\uff0c\u5269\u9918\u5eab\u5b58\uff1a&#039; .. (stock - quantity)<\/code><\/pre>\n<h2 id=\"%e6%ad%a5%e9%a9%9f%e4%b8%89%ef%bc%9a%e5%9c%a8-redis-%e4%b8%ad%e5%9f%b7%e8%a1%8c%e8%85%b3%e6%9c%ac-wsLvwubmUh\">\u6b65\u9a5f\u4e09\uff1a\u5728 Redis \u4e2d\u57f7\u884c\u8173\u672c<\/h2>\n<p>\u5c07\u4e0a\u8ff0\u8173\u672c\u4fdd\u5b58\u70ba <code>reduce_stock.lua<\/code>\uff0c\u7136\u5f8c\u4f7f\u7528 Redis \u7684 <code>EVAL<\/code> \u547d\u4ee4\u4f86\u57f7\u884c\u5b83\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u5728 Redis CLI \u4e2d\u57f7\u884c\u9019\u500b\u8173\u672c\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>EVAL \"$(cat reduce_stock.lua)\" 2 stock_key transaction_key 5<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5047\u8a2d\u8981\u6e1b\u5c11\u5eab\u5b58\u7684\u6578\u91cf\u70ba 5\uff0c\u4e26\u4e14 <code>stock_key<\/code> \u548c <code>transaction_key<\/code> \u5206\u5225\u662f\u5eab\u5b58\u548c\u4ea4\u6613\u8a18\u9304\u7684\u9375\u3002<\/p>\n<h2 id=\"%e6%ad%a5%e9%a9%9f%e5%9b%9b%ef%bc%9a%e6%b8%ac%e8%a9%a6%e8%85%b3%e6%9c%ac-wsLvwubmUh\">\u6b65\u9a5f\u56db\uff1a\u6e2c\u8a66\u8173\u672c<\/h2>\n<p>\u5728\u57f7\u884c\u8173\u672c\u4e4b\u524d\uff0c\u78ba\u4fdd\u5df2\u7d93\u5728 Redis \u4e2d\u8a2d\u7f6e\u4e86\u5eab\u5b58\u7684\u521d\u59cb\u503c\uff1a<\/p>\n<pre><code>SET stock_key 10<\/code><\/pre>\n<p>\u7136\u5f8c\u518d\u6b21\u57f7\u884c <code>EVAL<\/code> \u547d\u4ee4\uff0c\u6aa2\u67e5\u8fd4\u56de\u7684\u7d50\u679c\u548c\u5eab\u5b58\u7684\u8b8a\u5316\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-wsLvwubmUh\">\u7d50\u8ad6<\/h2>\n<p>\u901a\u904e\u9019\u500b\u6848\u4f8b\uff0c\u6211\u5011\u5c55\u793a\u4e86\u5982\u4f55\u5728 Redis \u4e2d\u7de8\u5beb\u548c\u57f7\u884c Lua \u8173\u672c\uff0c\u4ee5\u5be6\u73fe\u5eab\u5b58\u7ba1\u7406\u7684\u529f\u80fd\u3002\u9019\u7a2e\u65b9\u6cd5\u4e0d\u50c5\u63d0\u9ad8\u4e86\u64cd\u4f5c\u7684\u6548\u7387\uff0c\u9084\u78ba\u4fdd\u4e86\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u96a8\u8457\u61c9\u7528\u9700\u6c42\u7684\u589e\u9577\uff0cRedis \u8173\u672c\u7684\u9748\u6d3b\u6027\u548c\u5f37\u5927\u529f\u80fd\u5c07\u6210\u70ba\u958b\u767c\u8005\u7684\u91cd\u8981\u5de5\u5177\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u4f86\u904b\u884c Redis \u6709\u8208\u8da3\uff0c\u8acb\u96a8\u6642\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Redis\u8173\u672c\u7de8\u5beb\u7684\u5be6\u8e10\u6848\u4f8b\uff0c\u6df1\u5165\u4e86\u89e3\u5982\u4f55\u9ad8\u6548\u5229\u7528Lua\u8173\u672c\u63d0\u5347\u6578\u64da\u8655\u7406\u6027\u80fd\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-125053","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/125053","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=125053"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/125053\/revisions"}],"predecessor-version":[{"id":125054,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/125053\/revisions\/125054"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=125053"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=125053"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=125053"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}