{"id":152335,"date":"2024-11-01T22:07:25","date_gmt":"2024-11-01T14:07:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152335\/"},"modified":"2024-11-01T22:07:26","modified_gmt":"2024-11-01T14:07:26","slug":"%e6%93%8d%e4%bd%9credis%e7%9b%a3%e8%81%bd%e6%94%af%e6%8c%81%e5%a4%9a%e6%ac%a1%e6%93%8d%e4%bd%9c%ef%bc%88redis%e7%9b%a3%e8%81%bd%e5%9f%b7%e8%a1%8c%e5%a4%9a%e6%ac%a1%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152335\/","title":{"rendered":"\u64cd\u4f5cRedis\u76e3\u807d\u652f\u6301\u591a\u6b21\u64cd\u4f5c\uff08redis\u76e3\u807d\u57f7\u884c\u591a\u6b21\uff09"},"content":{"rendered":"

\u64cd\u4f5cRedis\u76e3\u807d\u652f\u6301\u591a\u6b21\u64cd\u4f5c\uff08redis\u76e3\u807d\u57f7\u884c\u591a\u6b21\uff09<\/h1>\n

Redis\u662f\u4e00\u500b\u9ad8\u6548\u80fd\u7684\u9375\u503c\u6578\u64da\u5eab\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u5834\u666f\u4e2d\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u5feb\u901f\u8b80\u53d6\u548c\u5beb\u5165\u6578\u64da\u7684\u61c9\u7528\u4e2d\u3002Redis\u7684\u76e3\u807d\u529f\u80fd\u5141\u8a31\u7528\u6236\u76e3\u63a7\u7279\u5b9a\u9375\u7684\u8b8a\u5316\uff0c\u9019\u5c0d\u65bc\u5be6\u6642\u6578\u64da\u8655\u7406\u548c\u4e8b\u4ef6\u9a45\u52d5\u7684\u61c9\u7528\u975e\u5e38\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728Redis\u4e2d\u5be6\u73fe\u76e3\u807d\u652f\u6301\u591a\u6b21\u64cd\u4f5c\u7684\u529f\u80fd\u3002<\/p>\n

Redis\u7684\u76e3\u807d\u6a5f\u5236<\/h2>\n

Redis\u63d0\u4f9b\u4e86\u4e00\u500b\u540d\u70baMONITOR<\/code>\u7684\u547d\u4ee4\uff0c\u8a72\u547d\u4ee4\u53ef\u4ee5\u7528\u4f86\u76e3\u807d\u6240\u6709\u7684\u8acb\u6c42\u3002\u7576\u57f7\u884cMONITOR<\/code>\u547d\u4ee4\u5f8c\uff0cRedis\u6703\u5c07\u6240\u6709\u7684\u547d\u4ee4\u53ca\u5176\u53c3\u6578\u767c\u9001\u5230\u5ba2\u6236\u7aef\uff0c\u9019\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u5be6\u6642\u67e5\u770b\u6578\u64da\u5eab\u7684\u64cd\u4f5c\u60c5\u6cc1\u3002<\/p>\n

\u7136\u800c\uff0cMONITOR<\/code>\u547d\u4ee4\u7684\u4f7f\u7528\u6709\u5176\u5c40\u9650\u6027\uff0c\u56e0\u70ba\u5b83\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u4e26\u4e14\u4e0d\u652f\u6301\u904e\u6ffe\u7279\u5b9a\u7684\u9375\u3002\u70ba\u4e86\u66f4\u6709\u6548\u5730\u76e3\u807d\u7279\u5b9a\u9375\u7684\u8b8a\u5316\uff0cRedis\u63d0\u4f9b\u4e86WATCH<\/code>\u547d\u4ee4\uff0c\u9019\u662f\u4e00\u500b\u66f4\u70ba\u7cbe\u7d30\u7684\u76e3\u807d\u6a5f\u5236\u3002<\/p>\n

\u4f7f\u7528WATCH\u547d\u4ee4\u9032\u884c\u591a\u6b21\u64cd\u4f5c<\/h2>\n

WATCH<\/code>\u547d\u4ee4\u5141\u8a31\u7528\u6236\u5728\u57f7\u884cMULTI<\/code>\u547d\u4ee4\u4e4b\u524d\u76e3\u807d\u4e00\u500b\u6216\u591a\u500b\u9375\u3002\u7576\u76e3\u807d\u7684\u9375\u5728MULTI<\/code>\u548cEXEC<\/code>\u4e4b\u9593\u88ab\u4fee\u6539\u6642\uff0cEXEC<\/code>\u547d\u4ee4\u5c07\u6703\u5931\u6557\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u5728\u591a\u6b21\u64cd\u4f5c\u4e2d\u51fa\u73fe\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u3002<\/p>\n

\u57fa\u672c\u7528\u6cd5\u793a\u4f8b<\/h3>\n
127.0.0.1:6379> WATCH key1\n127.0.0.1:6379> MULTI\n127.0.0.1:6379> SET key1 \"value1\"\n127.0.0.1:6379> SET key2 \"value2\"\n127.0.0.1:6379> EXEC\n<\/code><\/pre>\n
\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u4f7f\u7528WATCH<\/code>\u547d\u4ee4\u76e3\u807dkey1<\/code>\u3002\u63a5\u8457\uff0c\u6211\u5011\u958b\u59cb\u4e00\u500b\u4e8b\u52d9\uff08MULTI<\/code>\uff09\uff0c\u4e26\u5728\u4e8b\u52d9\u4e2d\u57f7\u884c\u591a\u500b\u64cd\u4f5c\u3002\u6700\u5f8c\uff0c\u4f7f\u7528EXEC<\/code>\u4f86\u63d0\u4ea4\u9019\u4e9b\u64cd\u4f5c\u3002\u5982\u679c\u5728MULTI<\/code>\u548cEXEC<\/code>\u4e4b\u9593key1<\/code>\u88ab\u4fee\u6539\uff0c\u5247EXEC<\/code>\u5c07\u6703\u5931\u6557\uff0c\u9019\u6a23\u53ef\u4ee5\u4fdd\u8b49\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/p>\n
\u76e3\u807d\u591a\u6b21\u64cd\u4f5c\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n
\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u76e3\u807d\u591a\u6b21\u64cd\u4f5c\u7684\u5834\u666f\u975e\u5e38\u5e38\u898b\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u4e2d\uff0c\u7576\u7528\u6236\u6dfb\u52a0\u5546\u54c1\u5230\u8cfc\u7269\u8eca\u6642\uff0c\u7cfb\u7d71\u9700\u8981\u78ba\u4fdd\u8a72\u5546\u54c1\u7684\u5eab\u5b58\u6578\u91cf\u4e0d\u6703\u5728\u64cd\u4f5c\u904e\u7a0b\u4e2d\u88ab\u5176\u4ed6\u7528\u6236\u4fee\u6539\u3002\u901a\u904e\u4f7f\u7528WATCH<\/code>\u547d\u4ee4\uff0c\u7cfb\u7d71\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62\u5eab\u5b58\u6578\u91cf\u7684\u7af6\u722d\u689d\u4ef6\u3002<\/p>\n
\u4ee3\u78bc\u793a\u4f8b<\/h3>\n
def add_to_cart(redis_client, user_id, product_id):\n    redis_client.WATCH(f\"product:{product_id}:stock\")\n    stock = redis_client.GET(f\"product:{product_id}:stock\")\n    \n    if int(stock) > 0:\n        redis_client.MULTI()\n        redis_client.DECR(f\"product:{product_id}:stock\")\n        redis_client.SADD(f\"user:{user_id}:cart\", product_id)\n        redis_client.EXEC()\n    else:\n        print(\"\u5eab\u5b58\u4e0d\u8db3\uff0c\u7121\u6cd5\u6dfb\u52a0\u5230\u8cfc\u7269\u8eca\")\n<\/code><\/pre>\n
\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u51fd\u6578add_to_cart<\/code>\uff0c\u8a72\u51fd\u6578\u9996\u5148\u76e3\u807d\u7522\u54c1\u7684\u5eab\u5b58\u9375\u3002\u5982\u679c\u5eab\u5b58\u5927\u65bc0\uff0c\u5247\u958b\u59cb\u4e00\u500b\u4e8b\u52d9\uff0c\u6e1b\u5c11\u5eab\u5b58\u4e26\u5c07\u7522\u54c1\u6dfb\u52a0\u5230\u7528\u6236\u7684\u8cfc\u7269\u8eca\u4e2d\u3002\u5982\u679c\u5eab\u5b58\u4e0d\u8db3\uff0c\u5247\u63d0\u793a\u7528\u6236\u7121\u6cd5\u6dfb\u52a0\u5546\u54c1\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
Redis\u7684\u76e3\u807d\u529f\u80fd\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u5de5\u5177\u4f86\u7ba1\u7406\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u901a\u904e\u4f7f\u7528WATCH<\/code>\u547d\u4ee4\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u591a\u6b21\u64cd\u4f5c\u4e2d\u6709\u6548\u5730\u76e3\u63a7\u7279\u5b9a\u9375\u7684\u8b8a\u5316\uff0c\u5f9e\u800c\u907f\u514d\u6578\u64da\u7af6\u722d\u689d\u4ef6\u7684\u767c\u751f\u3002\u9019\u5c0d\u65bc\u9700\u8981\u9ad8\u53ef\u9760\u6027\u548c\u5be6\u6642\u6027\u7684\u61c9\u7528\u5834\u666f\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u9999\u6e2fVPS<\/a><\/em>\u89e3\u6c7a\u65b9\u6848\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u9805\u76ee\u9084\u662f\u5927\u578b\u4f01\u696d\uff0c\u6211\u5011\u7684\u4e91\u4f3a\u670d\u5668<\/a><\/em>\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Redis\u76e3\u807d\u529f\u80fd\uff0c\u652f\u6301\u591a\u6b21\u64cd\u4f5c\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u5be6\u73fe\u9ad8\u6548\u7684\u5be6\u6642\u6578\u64da\u76e3\u63a7\u8207\u7ba1\u7406\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-152335","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152335","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=152335"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152335\/revisions"}],"predecessor-version":[{"id":152336,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152335\/revisions\/152336"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152335"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152335"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}