{"id":98660,"date":"2024-10-21T04:28:17","date_gmt":"2024-10-20T20:28:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/98660\/"},"modified":"2024-10-21T04:28:17","modified_gmt":"2024-10-20T20:28:17","slug":"redis-%e7%9a%84%e5%8f%af%e9%87%8d%e5%85%a5%e7%89%b9%e6%80%a7%e5%8f%8a%e5%85%b6%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/98660\/","title":{"rendered":"Redis \u7684\u53ef\u91cd\u5165\u7279\u6027\u53ca\u5176\u89e3\u6c7a\u65b9\u6848"},"content":{"rendered":"<h1 id=\"redis-%e7%9a%84%e5%8f%af%e9%87%8d%e5%85%a5%e7%89%b9%e6%80%a7%e5%8f%8a%e5%85%b6%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-NINEaesvgC\">Redis \u7684\u53ef\u91cd\u5165\u7279\u6027\u53ca\u5176\u89e3\u6c7a\u65b9\u6848<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0cRedis \u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u7de9\u5b58\u3001\u6d88\u606f\u968a\u5217\u548c\u6578\u64da\u6301\u4e45\u5316\u7b49\u5834\u666f\u3002\u5176\u6027\u80fd\u512a\u8d8a\u7684\u7279\u6027\u4f7f\u5f97\u958b\u767c\u8005\u5728\u8a2d\u8a08\u61c9\u7528\u6642\u7d93\u5e38\u9078\u64c7\u4f7f\u7528 Redis\u3002\u7136\u800c\uff0c\u7576\u6d89\u53ca\u5230\u591a\u7dda\u7a0b\u6216\u591a\u9032\u7a0b\u7684\u74b0\u5883\u6642\uff0cRedis \u7684\u53ef\u91cd\u5165\u7279\u6027\u4fbf\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\u56e0\u7d20\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%8f%af%e9%87%8d%e5%85%a5%e7%89%b9%e6%80%a7%ef%bc%9f-NINEaesvgC\">\u4ec0\u9ebc\u662f\u53ef\u91cd\u5165\u7279\u6027\uff1f<\/h2>\n<p>\u53ef\u91cd\u5165\u7279\u6027\uff08Reentrancy\uff09\u662f\u6307\u4e00\u6bb5\u7a0b\u5f0f\u78bc\u5728\u57f7\u884c\u904e\u7a0b\u4e2d\u53ef\u4ee5\u88ab\u4e2d\u65b7\uff0c\u4e26\u4e14\u5728\u4e2d\u65b7\u5f8c\u53ef\u4ee5\u5b89\u5168\u5730\u518d\u6b21\u57f7\u884c\u800c\u4e0d\u6703\u5f71\u97ff\u5230\u539f\u6709\u7684\u57f7\u884c\u72c0\u614b\u3002\u9019\u5728\u591a\u7dda\u7a0b\u74b0\u5883\u4e2d\u7279\u5225\u91cd\u8981\uff0c\u56e0\u70ba\u591a\u500b\u7dda\u7a0b\u53ef\u80fd\u540c\u6642\u8a2a\u554f\u540c\u4e00\u6bb5\u7a0b\u5f0f\u78bc\u3002\u5982\u679c\u9019\u6bb5\u7a0b\u5f0f\u78bc\u4e0d\u662f\u53ef\u91cd\u5165\u7684\uff0c\u5247\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6216\u7cfb\u7d71\u5d29\u6f70\u3002<\/p>\n<h2 id=\"redis-%e7%9a%84%e5%8f%af%e9%87%8d%e5%85%a5%e7%89%b9%e6%80%a7-NINEaesvgC\">Redis \u7684\u53ef\u91cd\u5165\u7279\u6027<\/h2>\n<p>Redis \u672c\u8eab\u662f\u55ae\u7dda\u7a0b\u7684\uff0c\u9019\u610f\u5473\u8457\u5728\u4efb\u4f55\u6642\u523b\u53ea\u6709\u4e00\u500b\u547d\u4ee4\u5728\u57f7\u884c\u3002\u9019\u7a2e\u8a2d\u8a08\u4f7f\u5f97 Redis \u5728\u8655\u7406\u8acb\u6c42\u6642\u5929\u7136\u5177\u5099\u4e86\u53ef\u91cd\u5165\u6027\uff0c\u56e0\u70ba\u4e0d\u6703\u6709\u591a\u500b\u7dda\u7a0b\u540c\u6642\u4fee\u6539\u540c\u4e00\u500b\u6578\u64da\u7d50\u69cb\u3002\u7136\u800c\uff0c\u7576 Redis \u88ab\u7528\u4f5c\u4e00\u500b\u5f8c\u7aef\u670d\u52d9\uff0c\u4e26\u4e14\u8207\u5176\u4ed6\u591a\u7dda\u7a0b\u61c9\u7528\u7a0b\u5e8f\u4ea4\u4e92\u6642\uff0c\u958b\u767c\u8005\u9700\u8981\u8003\u616e\u5230\u53ef\u91cd\u5165\u6027\u554f\u984c\u3002<\/p>\n<h3 id=\"%e5%8f%af%e9%87%8d%e5%85%a5%e6%80%a7%e5%95%8f%e9%a1%8c%e7%9a%84%e7%a4%ba%e4%be%8b-NINEaesvgC\">\u53ef\u91cd\u5165\u6027\u554f\u984c\u7684\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6709\u4e00\u500b\u61c9\u7528\u7a0b\u5e8f\u9700\u8981\u5f9e Redis \u4e2d\u7372\u53d6\u67d0\u500b\u9375\u7684\u503c\uff0c\u7136\u5f8c\u9032\u884c\u8a08\u7b97\uff0c\u6700\u5f8c\u5c07\u7d50\u679c\u5beb\u56de Redis\u3002\u5982\u679c\u9019\u500b\u904e\u7a0b\u4e2d\u6709\u5176\u4ed6\u7dda\u7a0b\u4e5f\u5728\u540c\u6642\u8a2a\u554f\u8a72\u9375\uff0c\u5247\u53ef\u80fd\u6703\u51fa\u73fe\u6578\u64da\u7af6\u722d\u7684\u60c5\u6cc1\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>1. \u7dda\u7a0b A \u7372\u53d6\u9375 \"counter\" \u7684\u503c\u70ba 10\n2. \u7dda\u7a0b B \u7372\u53d6\u9375 \"counter\" \u7684\u503c\u70ba 10\n3. \u7dda\u7a0b A \u5c07 \"counter\" \u7684\u503c\u52a0 1\uff0c\u5beb\u56de Redis\n4. \u7dda\u7a0b B \u5c07 \"counter\" \u7684\u503c\u52a0 1\uff0c\u5beb\u56de Redis\n<\/code><\/pre>\n<p>\u6700\u7d42\uff0c&#8221;counter&#8221; \u7684\u503c\u61c9\u8a72\u662f 12\uff0c\u4f46\u5be6\u969b\u4e0a\u537b\u662f 11\uff0c\u9019\u5c31\u662f\u53ef\u91cd\u5165\u6027\u554f\u984c\u7684\u5178\u578b\u4f8b\u5b50\u3002<\/p>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-NINEaesvgC\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u70ba\u4e86\u89e3\u6c7a Redis \u4e2d\u7684\u53ef\u91cd\u5165\u6027\u554f\u984c\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u7a2e\u7b56\u7565\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u4e8b\u52d9<\/strong>\uff1aRedis \u63d0\u4f9b\u4e86 MULTI \u548c EXEC \u547d\u4ee4\uff0c\u53ef\u4ee5\u5c07\u591a\u500b\u547d\u4ee4\u6253\u5305\u6210\u4e00\u500b\u4e8b\u52d9\u4f86\u57f7\u884c\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u4e8b\u52d9\u57f7\u884c\u671f\u9593\uff0c\u5176\u4ed6\u547d\u4ee4\u4e0d\u6703\u5e72\u64fe\u3002<\/li>\n<li><strong>\u4f7f\u7528\u9396<\/strong>\uff1a\u53ef\u4ee5\u4f7f\u7528 Redis \u7684 SETNX \u547d\u4ee4\u4f86\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\uff0c\u78ba\u4fdd\u5728\u67d0\u4e00\u6642\u523b\u53ea\u6709\u4e00\u500b\u7dda\u7a0b\u53ef\u4ee5\u8a2a\u554f\u7279\u5b9a\u7684\u8cc7\u6e90\u3002<\/li>\n<li><strong>\u4f7f\u7528 Lua \u8173\u672c<\/strong>\uff1aRedis \u652f\u6301 Lua \u8173\u672c\uff0c\u53ef\u4ee5\u5c07\u591a\u500b\u64cd\u4f5c\u5c01\u88dd\u5728\u4e00\u500b\u539f\u5b50\u64cd\u4f5c\u4e2d\u57f7\u884c\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u4e2d\u9593\u72c0\u614b\u88ab\u5176\u4ed6\u64cd\u4f5c\u5e72\u64fe\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-NINEaesvgC\">\u793a\u4f8b\u4ee3\u78bc<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 Lua \u8173\u672c\u4f86\u5be6\u73fe\u539f\u5b50\u64cd\u4f5c\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>local current = redis.call(\"GET\", KEYS[1])\nif current then\n    local new_value = tonumber(current) + 1\n    redis.call(\"SET\", KEYS[1], new_value)\nend\n<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u78ba\u4fdd\u4e86\u5728\u7372\u53d6\u548c\u8a2d\u7f6e\u503c\u7684\u904e\u7a0b\u4e2d\u4e0d\u6703\u88ab\u5176\u4ed6\u64cd\u4f5c\u6253\u65b7\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-NINEaesvgC\">\u7e3d\u7d50<\/h2>\n<p>Redis \u7684\u53ef\u91cd\u5165\u7279\u6027\u4f7f\u5176\u5728\u55ae\u7dda\u7a0b\u74b0\u5883\u4e2d\u8868\u73fe\u51fa\u8272\uff0c\u4f46\u5728\u591a\u7dda\u7a0b\u6216\u591a\u9032\u7a0b\u7684\u61c9\u7528\u4e2d\uff0c\u958b\u767c\u8005\u9700\u8981\u7279\u5225\u6ce8\u610f\u53ef\u91cd\u5165\u6027\u554f\u984c\u3002\u901a\u904e\u4f7f\u7528\u4e8b\u52d9\u3001\u9396\u548c Lua \u8173\u672c\u7b49\u6280\u8853\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u548c\u7a69\u5b9a\u6027\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u5c07\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 Redis \u7684\u53ef\u91cd\u5165\u7279\u6027\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u7ba1\u7406\u9396\u5b9a\u548c\u63d0\u9ad8\u7cfb\u7d71\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-98660","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/98660","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=98660"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/98660\/revisions"}],"predecessor-version":[{"id":98661,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/98660\/revisions\/98661"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=98660"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=98660"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=98660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}