{"id":124669,"date":"2024-10-25T16:09:25","date_gmt":"2024-10-25T08:09:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/124669\/"},"modified":"2024-10-25T16:09:26","modified_gmt":"2024-10-25T08:09:26","slug":"redis-%e9%9b%86%e7%be%a4%e4%b8%ad%e7%94%a8-setnx-%e5%af%a6%e7%8f%be%e9%ab%98%e6%95%88%e5%90%8c%e6%ad%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/124669\/","title":{"rendered":"Redis \u96c6\u7fa4\u4e2d\u7528 SetNX \u5be6\u73fe\u9ad8\u6548\u540c\u6b65"},"content":{"rendered":"<h1 id=\"redis-%e9%9b%86%e7%be%a4%e4%b8%ad%e7%94%a8-setnx-%e5%af%a6%e7%8f%be%e9%ab%98%e6%95%88%e5%90%8c%e6%ad%a5-lJpYiSCLii\">Redis \u96c6\u7fa4\u4e2d\u7528 SetNX \u5be6\u73fe\u9ad8\u6548\u540c\u6b65<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u540c\u6b65\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002Redis \u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u4f86\u5e6b\u52a9\u958b\u767c\u8005\u5be6\u73fe\u9019\u4e9b\u9700\u6c42\u3002\u5176\u4e2d\uff0cSetNX \u547d\u4ee4\uff08SET if Not eXists\uff09\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u529f\u80fd\uff0c\u7279\u5225\u662f\u5728 Redis \u96c6\u7fa4\u4e2d\u9032\u884c\u9ad8\u6548\u540c\u6b65\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SetNX \u7684\u5de5\u4f5c\u539f\u7406\u53ca\u5176\u5728 Redis \u96c6\u7fa4\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"setnx-%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-lJpYiSCLii\">SetNX \u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>SetNX \u547d\u4ee4\u7684\u4e3b\u8981\u529f\u80fd\u662f\u8a2d\u7f6e\u4e00\u500b\u9375\u7684\u503c\uff0c\u53ea\u6709\u5728\u8a72\u9375\u4e0d\u5b58\u5728\u7684\u60c5\u6cc1\u4e0b\u624d\u6703\u9032\u884c\u8a2d\u7f6e\u3002\u9019\u4f7f\u5f97 SetNX \u6210\u70ba\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u7684\u4e00\u500b\u7406\u60f3\u9078\u64c7\u3002\u7576\u591a\u500b\u5ba2\u6236\u7aef\u540c\u6642\u5617\u8a66\u8a2d\u7f6e\u540c\u4e00\u500b\u9375\u6642\uff0c\u53ea\u6709\u7b2c\u4e00\u500b\u6210\u529f\u7684\u5ba2\u6236\u7aef\u80fd\u5920\u8a2d\u7f6e\u8a72\u9375\uff0c\u5176\u4ed6\u5ba2\u6236\u7aef\u5247\u6703\u6536\u5230\u4e00\u500b\u932f\u8aa4\u97ff\u61c9\u3002<\/p>\n<pre><code>SETNX mylock \"locked\"<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u53ea\u6709\u7576\u9375 &#8220;mylock&#8221; \u4e0d\u5b58\u5728\u6642\uff0c\u624d\u6703\u5c07\u5176\u8a2d\u7f6e\u70ba &#8220;locked&#8221;\u3002\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62\u591a\u500b\u9032\u7a0b\u540c\u6642\u8a2a\u554f\u5171\u4eab\u8cc7\u6e90\uff0c\u5f9e\u800c\u907f\u514d\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u554f\u984c\u3002<\/p>\n<h2 id=\"redis-%e9%9b%86%e7%be%a4%e4%b8%ad%e7%9a%84-setnx-%e6%87%89%e7%94%a8-lJpYiSCLii\">Redis \u96c6\u7fa4\u4e2d\u7684 SetNX \u61c9\u7528<\/h2>\n<p>\u5728 Redis \u96c6\u7fa4\u4e2d\uff0c\u6578\u64da\u88ab\u5206\u6563\u5b58\u5132\u5728\u591a\u500b\u7bc0\u9ede\u4e0a\u3002\u9019\u7a2e\u67b6\u69cb\u96d6\u7136\u63d0\u9ad8\u4e86\u53ef\u64f4\u5c55\u6027\u548c\u53ef\u7528\u6027\uff0c\u4f46\u4e5f\u5e36\u4f86\u4e86\u6578\u64da\u4e00\u81f4\u6027\u548c\u540c\u6b65\u7684\u6311\u6230\u3002\u4f7f\u7528 SetNX \u53ef\u4ee5\u5e6b\u52a9\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u9032\u884c\u5206\u4f48\u5f0f\u9396\u7684\u5834\u666f\u4e2d\u3002<\/p>\n<h3 id=\"%e5%af%a6%e7%8f%be%e5%88%86%e4%bd%88%e5%bc%8f%e9%8e%96-lJpYiSCLii\">\u5be6\u73fe\u5206\u4f48\u5f0f\u9396<\/h3>\n<p>\u5728 Redis \u96c6\u7fa4\u4e2d\u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u7684\u57fa\u672c\u6b65\u9a5f\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u5ba2\u6236\u7aef\u4f7f\u7528 SetNX \u5617\u8a66\u7372\u53d6\u9396\u3002<\/li>\n<li>\u5982\u679c\u6210\u529f\u7372\u53d6\u9396\uff0c\u5247\u57f7\u884c\u9700\u8981\u4fdd\u8b77\u7684\u64cd\u4f5c\u3002<\/li>\n<li>\u64cd\u4f5c\u5b8c\u6210\u5f8c\uff0c\u5ba2\u6236\u7aef\u91cb\u653e\u9396\uff08\u522a\u9664\u9375\uff09\u3002<\/li>\n<li>\u5982\u679c\u672a\u80fd\u7372\u53d6\u9396\uff0c\u5247\u53ef\u4ee5\u9078\u64c7\u91cd\u8a66\u6216\u7b49\u5f85\u4e00\u6bb5\u6642\u9593\u5f8c\u518d\u8a66\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code>\nfunction acquireLock(redis, lockKey, lockValue, timeout) {\n    const result = redis.set(lockKey, lockValue, 'NX', 'EX', timeout);\n    return result === 'OK';\n}\n\nfunction releaseLock(redis, lockKey) {\n    redis.del(lockKey);\n}\n<\/code><\/pre>\n<h3 id=\"%e9%81%bf%e5%85%8d%e6%ad%bb%e9%8e%96-lJpYiSCLii\">\u907f\u514d\u6b7b\u9396<\/h3>\n<p>\u5728\u4f7f\u7528 SetNX \u5be6\u73fe\u5206\u4f48\u5f0f\u9396\u6642\uff0c\u5fc5\u9808\u5c0f\u5fc3\u907f\u514d\u6b7b\u9396\u7684\u60c5\u6cc1\u3002\u53ef\u4ee5\u901a\u904e\u8a2d\u7f6e\u9396\u7684\u904e\u671f\u6642\u9593\u4f86\u6e1b\u5c11\u9019\u7a2e\u98a8\u96aa\u3002\u9019\u6a23\uff0c\u5373\u4f7f\u67d0\u500b\u5ba2\u6236\u7aef\u5728\u64cd\u4f5c\u904e\u7a0b\u4e2d\u5d29\u6f70\uff0c\u9396\u4e5f\u6703\u5728\u4e00\u5b9a\u6642\u9593\u5f8c\u81ea\u52d5\u91cb\u653e\u3002<\/p>\n<h2 id=\"%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-lJpYiSCLii\">\u6027\u80fd\u8003\u91cf<\/h2>\n<p>\u5728\u9ad8\u4e26\u767c\u7684\u74b0\u5883\u4e2d\uff0c\u4f7f\u7528 SetNX \u4f86\u5be6\u73fe\u9396\u7684\u6027\u80fd\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002Redis \u7684\u55ae\u7dda\u7a0b\u67b6\u69cb\u4f7f\u5f97\u5b83\u5728\u8655\u7406\u5927\u91cf\u8acb\u6c42\u6642\u4ecd\u7136\u80fd\u4fdd\u6301\u9ad8\u6548\u3002\u4f7f\u7528 SetNX \u6642\uff0c\u61c9\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u6e1b\u5c11\u9396\u7684\u6301\u6709\u6642\u9593\uff1a\u78ba\u4fdd\u9396\u7684\u64cd\u4f5c\u76e1\u53ef\u80fd\u5feb\uff0c\u4ee5\u6e1b\u5c11\u5176\u4ed6\u8acb\u6c42\u7684\u7b49\u5f85\u6642\u9593\u3002<\/li>\n<li>\u5408\u7406\u8a2d\u7f6e\u904e\u671f\u6642\u9593\uff1a\u6839\u64da\u696d\u52d9\u9700\u6c42\u8a2d\u7f6e\u5408\u9069\u7684\u9396\u904e\u671f\u6642\u9593\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u9396\u6301\u6709\u3002<\/li>\n<li>\u76e3\u63a7\u9396\u7684\u4f7f\u7528\u60c5\u6cc1\uff1a\u5b9a\u671f\u6aa2\u67e5\u9396\u7684\u4f7f\u7528\u60c5\u6cc1\uff0c\u53ca\u6642\u8abf\u6574\u7b56\u7565\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-lJpYiSCLii\">\u7d50\u8ad6<\/h2>\n<p>SetNX \u662f Redis \u4e2d\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5728\u96c6\u7fa4\u74b0\u5883\u4e2d\u5be6\u73fe\u9ad8\u6548\u7684\u6578\u64da\u540c\u6b65\u548c\u4e00\u81f4\u6027\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528 SetNX\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u5206\u4f48\u5f0f\u9396\uff0c\u907f\u514d\u6578\u64da\u4e0d\u4e00\u81f4\u548c\u6b7b\u9396\u7684\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u53ef\u7528\u6027\u548c\u53ef\u64f4\u5c55\u6027\u7684\u61c9\u7528\uff0cRedis \u96c6\u7fa4\u63d0\u4f9b\u4e86\u4e00\u500b\u7406\u60f3\u7684\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u548c <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u5728 Redis \u96c6\u7fa4\u4e2d\u5229\u7528 SetNX \u5be6\u73fe\u9ad8\u6548\u540c\u6b65\uff0c\u63d0\u5347\u6578\u64da\u4e00\u81f4\u6027\u8207\u6027\u80fd\uff0c\u78ba\u4fdd\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u8207\u53ef\u9760\u6027\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-124669","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/124669","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=124669"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/124669\/revisions"}],"predecessor-version":[{"id":124670,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/124669\/revisions\/124670"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=124669"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=124669"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=124669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}