{"id":128533,"date":"2024-10-26T14:51:17","date_gmt":"2024-10-26T06:51:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/128533\/"},"modified":"2024-10-26T14:51:17","modified_gmt":"2024-10-26T06:51:17","slug":"redis%e5%af%a6%e7%8f%be%e9%ab%98%e4%b8%a6%e7%99%bc%e8%87%aa%e6%b8%9b%e6%93%8d%e4%bd%9c%ef%bc%88redis%e8%87%aa%e6%b8%9b-%e9%ab%98%e4%b8%a6%e7%99%bc%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/128533\/","title":{"rendered":"Redis\u5be6\u73fe\u9ad8\u4e26\u767c\u81ea\u6e1b\u64cd\u4f5c\uff08redis\u81ea\u6e1b \u9ad8\u4e26\u767c\uff09"},"content":{"rendered":"

Redis\u5be6\u73fe\u9ad8\u4e26\u767c\u81ea\u6e1b\u64cd\u4f5c\uff08redis\u81ea\u6e1b \u9ad8\u4e26\u767c\uff09<\/h1>\n

\u5728\u7576\u4eca\u7684\u7db2\u7d61\u61c9\u7528\u4e2d\uff0c\u9ad8\u4e26\u767c\u7684\u9700\u6c42\u8d8a\u4f86\u8d8a\u666e\u904d\uff0c\u5c24\u5176\u662f\u5728\u96fb\u5b50\u5546\u52d9\u3001\u793e\u4ea4\u5a92\u9ad4\u548c\u5373\u6642\u901a\u8a0a\u7b49\u9818\u57df\u3002Redis\u4f5c\u70ba\u4e00\u7a2e\u9ad8\u6548\u7684\u5167\u5b58\u6578\u64da\u5eab\uff0c\u56e0\u5176\u5353\u8d8a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u6578\u64da\u7d50\u69cb\uff0c\u6210\u70ba\u4e86\u5be6\u73fe\u9ad8\u4e26\u767c\u64cd\u4f5c\u7684\u7406\u60f3\u9078\u64c7\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5229\u7528Redis\u5be6\u73fe\u9ad8\u4e26\u767c\u7684\u81ea\u6e1b\u64cd\u4f5c\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u81ea\u6e1b\u64cd\u4f5c\uff1f<\/h2>\n

\u81ea\u6e1b\u64cd\u4f5c\u662f\u6307\u5c0d\u67d0\u500b\u6578\u503c\u9032\u884c\u6e1b\u5c11\u7684\u64cd\u4f5c\uff0c\u901a\u5e38\u7528\u65bc\u8a08\u6578\u5668\u6216\u5eab\u5b58\u7ba1\u7406\u7b49\u5834\u666f\u3002\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\uff0c\u7576\u591a\u500b\u8acb\u6c42\u540c\u6642\u5c0d\u540c\u4e00\u6578\u64da\u9032\u884c\u81ea\u6e1b\u64cd\u4f5c\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u554f\u984c\u3002\u56e0\u6b64\uff0c\u5982\u4f55\u5b89\u5168\u5730\u5be6\u73fe\u81ea\u6e1b\u64cd\u4f5c\u662f\u958b\u767c\u8005\u9700\u8981\u9762\u5c0d\u7684\u4e00\u500b\u6311\u6230\u3002<\/p>\n

Redis\u7684\u539f\u5b50\u6027\u64cd\u4f5c<\/h2>\n

Redis\u63d0\u4f9b\u4e86\u591a\u7a2e\u539f\u5b50\u6027\u64cd\u4f5c\uff0c\u9019\u4f7f\u5f97\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\u9032\u884c\u81ea\u6e1b\u64cd\u4f5c\u8b8a\u5f97\u66f4\u52a0\u7c21\u55ae\u3002Redis\u7684\u547d\u4ee4\u5982DECR<\/code>\u548cDECRBY<\/code>\u53ef\u4ee5\u5b89\u5168\u5730\u5c0d\u6574\u6578\u9032\u884c\u81ea\u6e1b\uff0c\u9019\u4e9b\u64cd\u4f5c\u662f\u539f\u5b50\u6027\u7684\uff0c\u610f\u5473\u8457\u5728\u57f7\u884c\u9019\u4e9b\u547d\u4ee4\u6642\uff0c\u4e0d\u6703\u88ab\u5176\u4ed6\u64cd\u4f5c\u6253\u65b7\u3002<\/p>\n

\u4f7f\u7528DECR\u547d\u4ee4<\/h3>\n

\u4ee5\u4e0b\u662f\u4f7f\u7528DECR<\/code>\u547d\u4ee4\u7684\u793a\u4f8b\uff1a<\/p>\n

127.0.0.1:6379> SET stock 10\nOK\n127.0.0.1:6379> DECR stock\n(integer) 9\n127.0.0.1:6379> DECR stock\n(integer) 8\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u9996\u5148\u8a2d\u7f6e\u4e86\u4e00\u500b\u540d\u70bastock<\/code>\u7684\u9375\uff0c\u5176\u503c\u70ba10\u3002\u7136\u5f8c\uff0c\u6211\u5011\u4f7f\u7528DECR<\/code>\u547d\u4ee4\u5c0d\u5176\u9032\u884c\u81ea\u6e1b\uff0c\u6bcf\u6b21\u8abf\u7528\u90fd\u6703\u5c07\u503c\u6e1b\u5c111\u3002<\/p>\n
\u4f7f\u7528DECRBY\u547d\u4ee4<\/h3>\n
\u5982\u679c\u9700\u8981\u4e00\u6b21\u6e1b\u5c11\u591a\u500b\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528DECRBY<\/code>\u547d\u4ee4\uff1a<\/p>\n
127.0.0.1:6379> SET stock 10\nOK\n127.0.0.1:6379> DECRBY stock 3\n(integer) 7\n<\/code><\/pre>\n
\u5728\u9019\u88e1\uff0c\u6211\u5011\u5c07stock<\/code>\u7684\u503c\u6e1b\u5c11\u4e863\uff0c\u6700\u7d42\u7d50\u679c\u70ba7\u3002<\/p>\n
\u9ad8\u4e26\u767c\u5834\u666f\u4e0b\u7684\u81ea\u6e1b\u64cd\u4f5c<\/h2>\n
\u5728\u9ad8\u4e26\u767c\u5834\u666f\u4e2d\uff0c\u53ef\u80fd\u6703\u6709\u591a\u500b\u5ba2\u6236\u7aef\u540c\u6642\u5c0d\u540c\u4e00\u500b\u9375\u9032\u884c\u81ea\u6e1b\u64cd\u4f5c\u3002\u70ba\u4e86\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0cRedis\u7684\u539f\u5b50\u6027\u64cd\u4f5c\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u7af6\u722d\u689d\u4ef6\u7684\u767c\u751f\u3002<\/p>\n
\u793a\u4f8b\uff1a\u9ad8\u4e26\u767c\u81ea\u6e1b\u64cd\u4f5c<\/h3>\n
\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u5eab\u5b58\u7cfb\u7d71\uff0c\u7576\u7528\u6236\u4e0b\u55ae\u6642\uff0c\u9700\u8981\u6e1b\u5c11\u5eab\u5b58\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\u5b89\u5168\u5730\u9032\u884c\u81ea\u6e1b\u64cd\u4f5c\uff1a<\/p>\n
import redis\nimport threading\n\n# \u9023\u63a5\u5230Redis\nr = redis.Redis(host='localhost', port=6379, db=0)\n\n# \u8a2d\u7f6e\u521d\u59cb\u5eab\u5b58\nr.set('stock', 100)\n\ndef place_order():\n    # \u5617\u8a66\u6e1b\u5c11\u5eab\u5b58\n    if r.decr('stock') >= 0:\n        print(\"\u8a02\u55ae\u6210\u529f\uff0c\u5eab\u5b58\u6e1b\u5c11\")\n    else:\n        print(\"\u5eab\u5b58\u4e0d\u8db3\uff0c\u8a02\u55ae\u5931\u6557\")\n\n# \u5275\u5efa\u591a\u500b\u7dda\u7a0b\u6a21\u64ec\u9ad8\u4e26\u767c\nthreads = []\nfor i in range(10):\n    t = threading.Thread(target=place_order)\n    threads.append(t)\n    t.start()\n\nfor t in threads:\n    t.join()\n<\/code><\/pre>\n
\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e8610\u500b\u7dda\u7a0b\uff0c\u6bcf\u500b\u7dda\u7a0b\u90fd\u5617\u8a66\u6e1b\u5c11\u5eab\u5b58\u3002\u7531\u65bcRedis\u7684\u539f\u5b50\u6027\u64cd\u4f5c\uff0c\u7121\u8ad6\u6709\u591a\u5c11\u500b\u7dda\u7a0b\u540c\u6642\u57f7\u884c\uff0c\u5eab\u5b58\u7684\u6578\u64da\u90fd\u80fd\u4fdd\u6301\u4e00\u81f4\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
Redis\u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u5167\u5b58\u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u4e86\u539f\u5b50\u6027\u64cd\u4f5c\u4f86\u652f\u6301\u9ad8\u4e26\u767c\u7684\u81ea\u6e1b\u64cd\u4f5c\u3002\u901a\u904e\u4f7f\u7528DECR<\/code>\u548cDECRBY<\/code>\u547d\u4ee4\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u5be6\u73fe\u5b89\u5168\u7684\u81ea\u6e1b\u64cd\u4f5c\uff0c\u5f9e\u800c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u5728\u9ad8\u4e26\u767c\u7684\u5834\u666f\u4e2d\uff0cRedis\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u4f7f\u5176\u6210\u70ba\u7406\u60f3\u7684\u9078\u64c7\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 \u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684Redis\u670d\u52d9\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u9ad8\u6027\u80fd\u7684 \u4e91\u4f3a\u670d\u5668<\/a> \u9084\u662f\u9748\u6d3b\u7684 \u9999\u6e2f\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u5982\u4f55\u5229\u7528Redis\u5be6\u73fe\u9ad8\u4e26\u767c\u81ea\u6e1b\u64cd\u4f5c\uff0c\u63d0\u5347\u7cfb\u7d71\u6027\u80fd\u8207\u6548\u7387\uff0c\u61c9\u5c0d\u5927\u91cf\u8acb\u6c42\u7684\u6311\u6230\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-128533","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/128533","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=128533"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/128533\/revisions"}],"predecessor-version":[{"id":128534,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/128533\/revisions\/128534"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=128533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=128533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=128533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}