{"id":134541,"date":"2024-10-31T01:01:20","date_gmt":"2024-10-30T17:01:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/134541\/"},"modified":"2024-10-31T01:01:21","modified_gmt":"2024-10-30T17:01:21","slug":"redis%e6%9c%89%e6%95%88%e8%a7%a3%e6%b1%ba%e5%95%86%e5%93%81%e8%b6%85%e8%b3%a3%e5%95%8f%e9%a1%8c%ef%bc%88redis%e8%a7%a3%e6%b1%ba%e5%95%86%e5%93%81%e8%b6%85%e8%b3%a3%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/134541\/","title":{"rendered":"Redis\u6709\u6548\u89e3\u6c7a\u5546\u54c1\u8d85\u8ce3\u554f\u984c\uff08redis\u89e3\u6c7a\u5546\u54c1\u8d85\u8ce3\uff09"},"content":{"rendered":"<h1 id=\"redis%e6%9c%89%e6%95%88%e8%a7%a3%e6%b1%ba%e5%95%86%e5%93%81%e8%b6%85%e8%b3%a3%e5%95%8f%e9%a1%8c-XjAzSIeIcf\">Redis\u6709\u6548\u89e3\u6c7a\u5546\u54c1\u8d85\u8ce3\u554f\u984c<\/h1>\n<p>\u5728\u96fb\u5b50\u5546\u52d9\u7684\u4e16\u754c\u4e2d\uff0c\u5546\u54c1\u8d85\u8ce3\u662f\u4e00\u500b\u5e38\u898b\u4e14\u68d8\u624b\u7684\u554f\u984c\u3002\u7576\u591a\u500b\u7528\u6236\u540c\u6642\u5617\u8a66\u8cfc\u8cb7\u540c\u4e00\u5546\u54c1\u6642\uff0c\u7cfb\u7d71\u53ef\u80fd\u7121\u6cd5\u6b63\u78ba\u8655\u7406\u5eab\u5b58\uff0c\u5c0e\u81f4\u8d85\u8ce3\u60c5\u6cc1\u7684\u767c\u751f\u3002\u9019\u4e0d\u50c5\u5f71\u97ff\u4e86\u9867\u5ba2\u7684\u8cfc\u7269\u9ad4\u9a57\uff0c\u9084\u53ef\u80fd\u5c0d\u5546\u5bb6\u7684\u4fe1\u8b7d\u9020\u6210\u640d\u5bb3\u3002\u70ba\u4e86\u89e3\u6c7a\u9019\u4e00\u554f\u984c\uff0cRedis\u4f5c\u70ba\u4e00\u7a2e\u9ad8\u6548\u7684\u6578\u64da\u7d50\u69cb\u5b58\u5132\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afredis%ef%bc%9f-XjAzSIeIcf\">\u4ec0\u9ebc\u662fRedis\uff1f<\/h2>\n<p>Redis\u662f\u4e00\u7a2e\u958b\u6e90\u7684\u5167\u5b58\u6578\u64da\u5eab\uff0c\u652f\u6301\u591a\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u5982\u5b57\u7b26\u4e32\u3001\u54c8\u5e0c\u3001\u5217\u8868\u3001\u96c6\u5408\u7b49\u3002\u7531\u65bc\u5176\u9ad8\u6548\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u6578\u64da\u7d50\u69cb\uff0cRedis\u88ab\u5ee3\u6cdb\u61c9\u7528\u65bc\u9700\u8981\u5feb\u901f\u8b80\u5beb\u7684\u5834\u666f\uff0c\u5982\u7de9\u5b58\u3001\u6d88\u606f\u968a\u5217\u548c\u5be6\u6642\u6578\u64da\u5206\u6790\u7b49\u3002<\/p>\n<h2 id=\"%e5%95%86%e5%93%81%e8%b6%85%e8%b3%a3%e7%9a%84%e6%88%90%e5%9b%a0-XjAzSIeIcf\">\u5546\u54c1\u8d85\u8ce3\u7684\u6210\u56e0<\/h2>\n<p>\u5546\u54c1\u8d85\u8ce3\u901a\u5e38\u767c\u751f\u5728\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u591a\u500b\u7528\u6236\u540c\u6642\u4e0b\u55ae\uff0c\u5c0e\u81f4\u5eab\u5b58\u6578\u91cf\u4e0d\u8db3\u3002<\/li>\n<li>\u7cfb\u7d71\u5ef6\u9072\u6216\u6545\u969c\uff0c\u7121\u6cd5\u53ca\u6642\u66f4\u65b0\u5eab\u5b58\u72c0\u614b\u3002<\/li>\n<li>\u7f3a\u4e4f\u6709\u6548\u7684\u9396\u5b9a\u6a5f\u5236\uff0c\u5c0e\u81f4\u6578\u64da\u7af6\u722d\u3002<\/li>\n<\/ul>\n<h2 id=\"redis%e8%a7%a3%e6%b1%ba%e5%95%86%e5%93%81%e8%b6%85%e8%b3%a3%e7%9a%84%e6%96%b9%e6%a1%88-XjAzSIeIcf\">Redis\u89e3\u6c7a\u5546\u54c1\u8d85\u8ce3\u7684\u65b9\u6848<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e5%88%86%e5%b8%83%e5%bc%8f%e9%8e%96-XjAzSIeIcf\">1. \u4f7f\u7528\u5206\u5e03\u5f0f\u9396<\/h3>\n<p>Redis\u63d0\u4f9b\u4e86\u7c21\u55ae\u800c\u6709\u6548\u7684\u5206\u5e03\u5f0f\u9396\u6a5f\u5236\uff0c\u53ef\u4ee5\u9632\u6b62\u591a\u500b\u8acb\u6c42\u540c\u6642\u4fee\u6539\u5eab\u5b58\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528Redis\u5be6\u73fe\u5206\u5e03\u5f0f\u9396\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nimport redis\nimport time\n\nr = redis.Redis(host='localhost', port=6379, db=0)\n\ndef purchase_item(item_id):\n    lock_key = f\"lock:{item_id}\"\n    lock_value = str(time.time() + 5)  # \u9396\u7684\u904e\u671f\u6642\u9593\n    if r.set(lock_key, lock_value, nx=True, ex=5):\n        try:\n            # \u6aa2\u67e5\u5eab\u5b58\n            stock = r.get(f\"stock:{item_id}\")\n            if stock and int(stock) &gt; 0:\n                # \u66f4\u65b0\u5eab\u5b58\n                r.decr(f\"stock:{item_id}\")\n                print(\"\u8cfc\u8cb7\u6210\u529f\")\n            else:\n                print(\"\u5eab\u5b58\u4e0d\u8db3\")\n        finally:\n            # \u91cb\u653e\u9396\n            r.delete(lock_key)\n    else:\n        print(\"\u8acb\u6c42\u904e\u65bc\u983b\u7e41\uff0c\u8acb\u7a0d\u5f8c\u518d\u8a66\")\n<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e4%ba%8b%e5%8b%99%e8%99%95%e7%90%86-XjAzSIeIcf\">2. \u4f7f\u7528\u4e8b\u52d9\u8655\u7406<\/h3>\n<p>Redis\u7684\u4e8b\u52d9\u8655\u7406\u529f\u80fd\u53ef\u4ee5\u78ba\u4fdd\u4e00\u7d44\u64cd\u4f5c\u8981\u9ebc\u5168\u90e8\u6210\u529f\uff0c\u8981\u9ebc\u5168\u90e8\u5931\u6557\u3002\u9019\u5c0d\u65bc\u5eab\u5b58\u66f4\u65b0\u975e\u5e38\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528Redis\u4e8b\u52d9\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>\ndef purchase_item_with_transaction(item_id):\n    with r.pipeline() as pipe:\n        while True:\n            try:\n                pipe.watch(f\"stock:{item_id}\")\n                stock = pipe.get(f\"stock:{item_id}\")\n                if stock and int(stock) &gt; 0:\n                    pipe.multi()\n                    pipe.decr(f\"stock:{item_id}\")\n                    pipe.execute()\n                    print(\"\u8cfc\u8cb7\u6210\u529f\")\n                else:\n                    print(\"\u5eab\u5b58\u4e0d\u8db3\")\n                break\n            except redis.WatchError:\n                continue\n<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e6%b6%88%e6%81%af%e9%9a%8a%e5%88%97-XjAzSIeIcf\">3. \u4f7f\u7528\u6d88\u606f\u968a\u5217<\/h3>\n<p>\u5728\u9ad8\u6d41\u91cf\u7684\u60c5\u6cc1\u4e0b\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u6d88\u606f\u968a\u5217\u4f86\u8655\u7406\u8cfc\u8cb7\u8acb\u6c42\u3002\u9019\u6a23\u53ef\u4ee5\u5c07\u8acb\u6c42\u6392\u968a\uff0c\u9010\u4e00\u8655\u7406\uff0c\u5f9e\u800c\u6e1b\u5c11\u8d85\u8ce3\u7684\u98a8\u96aa\u3002Redis\u7684\u5217\u8868\u7d50\u69cb\u53ef\u4ee5\u7528\u4f5c\u7c21\u55ae\u7684\u6d88\u606f\u968a\u5217\u3002<\/p>\n<pre><code>\ndef enqueue_purchase_request(item_id):\n    r.lpush(\"purchase_queue\", item_id)\n\ndef process_purchase_requests():\n    while True:\n        item_id = r.rpop(\"purchase_queue\")\n        if item_id:\n            purchase_item(item_id)\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-XjAzSIeIcf\">\u7e3d\u7d50<\/h2>\n<p>\u5546\u54c1\u8d85\u8ce3\u554f\u984c\u5728\u96fb\u5b50\u5546\u52d9\u4e2d\u662f\u4e00\u500b\u91cd\u8981\u7684\u6311\u6230\uff0c\u800cRedis\u63d0\u4f9b\u4e86\u591a\u7a2e\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u5305\u62ec\u5206\u5e03\u5f0f\u9396\u3001\u4e8b\u52d9\u8655\u7406\u548c\u6d88\u606f\u968a\u5217\u7b49\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u80fd\u63d0\u9ad8\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\uff0c\u9084\u80fd\u6539\u5584\u9867\u5ba2\u7684\u8cfc\u7269\u9ad4\u9a57\u3002\u5c0d\u65bc\u5e0c\u671b\u63d0\u5347\u696d\u52d9\u904b\u71df\u6548\u7387\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6280\u8853\u67b6\u69cb\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Redis\u6709\u6548\u89e3\u6c7a\u5546\u54c1\u8d85\u8ce3\u554f\u984c\uff0c\u901a\u904e\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u548c\u9396\u6a5f\u5236\uff0c\u78ba\u4fdd\u5eab\u5b58\u6e96\u78ba\uff0c\u63d0\u5347\u8cfc\u7269\u9ad4\u9a57\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-134541","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/134541","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=134541"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/134541\/revisions"}],"predecessor-version":[{"id":134542,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/134541\/revisions\/134542"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=134541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=134541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=134541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}