{"id":183802,"date":"2024-11-10T07:51:17","date_gmt":"2024-11-09T23:51:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183802\/"},"modified":"2024-11-10T07:51:18","modified_gmt":"2024-11-09T23:51:18","slug":"%e4%bd%bf%e7%94%a8mongodb%e9%80%b2%e8%a1%8c%e5%ad%97%e6%ae%b5%e7%9b%b8%e6%b8%9b%e6%93%8d%e4%bd%9c%ef%bc%88mongodb%e5%ad%97%e6%ae%b5%e7%9b%b8%e6%b8%9b%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183802\/","title":{"rendered":"\u4f7f\u7528MongoDB\u9032\u884c\u5b57\u6bb5\u76f8\u6e1b\u64cd\u4f5c\uff08mongodb\u5b57\u6bb5\u76f8\u6e1b\uff09"},"content":{"rendered":"<h1 id=\"%e4%bd%bf%e7%94%a8mongodb%e9%80%b2%e8%a1%8c%e5%ad%97%e6%ae%b5%e7%9b%b8%e6%b8%9b%e6%93%8d%e4%bd%9c%ef%bc%88mongodb%e5%ad%97%e6%ae%b5%e7%9b%b8%e6%b8%9b%ef%bc%89-BcNrEWmqRu\">\u4f7f\u7528MongoDB\u9032\u884c\u5b57\u6bb5\u76f8\u6e1b\u64cd\u4f5c\uff08mongodb\u5b57\u6bb5\u76f8\u6e1b\uff09<\/h1>\n<p>\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5e8f\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u9078\u64c7\u5c0d\u65bc\u6027\u80fd\u548c\u53ef\u64f4\u5c55\u6027\u81f3\u95dc\u91cd\u8981\u3002MongoDB\u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684NoSQL\u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u6578\u64da\u6a21\u578b\u548c\u5f37\u5927\u7684\u67e5\u8a62\u529f\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728MongoDB\u4e2d\u9032\u884c\u5b57\u6bb5\u76f8\u6e1b\u64cd\u4f5c\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"mongodb%e7%b0%a1%e4%bb%8b-BcNrEWmqRu\">MongoDB\u7c21\u4ecb<\/h2>\n<p>MongoDB\u662f\u4e00\u7a2e\u6587\u6a94\u5c0e\u5411\u7684\u6578\u64da\u5eab\uff0c\u4f7f\u7528BSON\uff08\u985e\u4f3cJSON\u7684\u683c\u5f0f\uff09\u4f86\u5b58\u5132\u6578\u64da\u3002\u5b83\u7684\u9748\u6d3b\u6027\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u8f15\u9b06\u5730\u8655\u7406\u7d50\u69cb\u5316\u548c\u975e\u7d50\u69cb\u5316\u6578\u64da\u3002MongoDB\u652f\u6301\u8907\u96dc\u7684\u67e5\u8a62\u64cd\u4f5c\uff0c\u5305\u62ec\u5b57\u6bb5\u7684\u76f8\u6e1b\uff0c\u9019\u5728\u8a31\u591a\u61c9\u7528\u5834\u666f\u4e2d\u90fd\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2 id=\"%e5%ad%97%e6%ae%b5%e7%9b%b8%e6%b8%9b%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-BcNrEWmqRu\">\u5b57\u6bb5\u76f8\u6e1b\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u5b57\u6bb5\u76f8\u6e1b\u64cd\u4f5c\u901a\u5e38\u7528\u65bc\u8a08\u7b97\u5169\u500b\u5b57\u6bb5\u4e4b\u9593\u7684\u5dee\u7570\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u96fb\u5b50\u5546\u52d9\u61c9\u7528\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u8a08\u7b97\u5546\u54c1\u7684\u5eab\u5b58\u8b8a\u5316\uff0c\u6216\u8005\u5728\u8ca1\u52d9\u61c9\u7528\u4e2d\u8a08\u7b97\u6536\u5165\u548c\u652f\u51fa\u7684\u5dee\u984d\u3002\u9019\u4e9b\u64cd\u4f5c\u53ef\u4ee5\u5e6b\u52a9\u4f01\u696d\u505a\u51fa\u66f4\u660e\u667a\u7684\u6c7a\u7b56\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8mongodb%e9%80%b2%e8%a1%8c%e5%ad%97%e6%ae%b5%e7%9b%b8%e6%b8%9b-BcNrEWmqRu\">\u4f7f\u7528MongoDB\u9032\u884c\u5b57\u6bb5\u76f8\u6e1b<\/h2>\n<p>\u5728MongoDB\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u805a\u5408\u7ba1\u9053\u4f86\u5be6\u73fe\u5b57\u6bb5\u76f8\u6e1b\u64cd\u4f5c\u3002\u805a\u5408\u7ba1\u9053\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u5141\u8a31\u7528\u6236\u5c0d\u6578\u64da\u9032\u884c\u8f49\u63db\u548c\u8a08\u7b97\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528MongoDB\u9032\u884c\u5b57\u6bb5\u76f8\u6e1b\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e6%ba%96%e5%82%99%e6%95%b8%e6%93%9a-BcNrEWmqRu\">1. \u6e96\u5099\u6578\u64da<\/h3>\n<p>\u9996\u5148\uff0c\u6211\u5011\u9700\u8981\u4e00\u500b\u793a\u4f8b\u96c6\u5408\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>products<\/code>\u7684\u96c6\u5408\uff0c\u5305\u542b\u4ee5\u4e0b\u6587\u6a94\uff1a<\/p>\n<pre><code>{\n    \"_id\": 1,\n    \"name\": \"\u5546\u54c1A\",\n    \"initial_stock\": 100,\n    \"sold\": 30\n},\n{\n    \"_id\": 2,\n    \"name\": \"\u5546\u54c1B\",\n    \"initial_stock\": 200,\n    \"sold\": 50\n}<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e8%81%9a%e5%90%88%e7%ae%a1%e9%81%93%e9%80%b2%e8%a1%8c%e5%ad%97%e6%ae%b5%e7%9b%b8%e6%b8%9b-BcNrEWmqRu\">2. \u4f7f\u7528\u805a\u5408\u7ba1\u9053\u9032\u884c\u5b57\u6bb5\u76f8\u6e1b<\/h3>\n<p>\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u805a\u5408\u7ba1\u9053\u4f86\u8a08\u7b97\u6bcf\u500b\u5546\u54c1\u7684\u5269\u9918\u5eab\u5b58\u3002\u4ee5\u4e0b\u662f\u76f8\u61c9\u7684\u67e5\u8a62\uff1a<\/p>\n<pre><code>db.products.aggregate([\n    {\n        $project: {\n            name: 1,\n            remaining_stock: {\n                $subtract: [\"$initial_stock\", \"$sold\"]\n            }\n        }\n    }\n])<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c<code>$project<\/code>\u64cd\u4f5c\u7b26\u7528\u65bc\u9078\u64c7\u8981\u8fd4\u56de\u7684\u5b57\u6bb5\uff0c\u800c<code>$subtract<\/code>\u64cd\u4f5c\u7b26\u5247\u7528\u65bc\u8a08\u7b97<code>initial_stock<\/code>\u548c<code>sold<\/code>\u4e4b\u9593\u7684\u5dee\u503c\u3002\u57f7\u884c\u9019\u500b\u67e5\u8a62\u5f8c\uff0c\u6211\u5011\u5c07\u5f97\u5230\u4ee5\u4e0b\u7d50\u679c\uff1a<\/p>\n<pre><code>{\n    \"_id\": 1,\n    \"name\": \"\u5546\u54c1A\",\n    \"remaining_stock\": 70\n},\n{\n    \"_id\": 2,\n    \"name\": \"\u5546\u54c1B\",\n    \"remaining_stock\": 150\n}<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-BcNrEWmqRu\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u5b57\u6bb5\u76f8\u6e1b\u64cd\u4f5c\u6642\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u53c3\u8207\u8a08\u7b97\u7684\u5b57\u6bb5\u90fd\u662f\u6578\u5b57\u985e\u578b\uff0c\u5426\u5247\u6703\u5c0e\u81f4\u932f\u8aa4\u3002<\/li>\n<li>\u5728\u9032\u884c\u5927\u898f\u6a21\u6578\u64da\u8655\u7406\u6642\uff0c\u8003\u616e\u6027\u80fd\u5f71\u97ff\uff0c\u9069\u7576\u4f7f\u7528\u7d22\u5f15\u3002<\/li>\n<li>\u5c0d\u65bc\u8907\u96dc\u7684\u8a08\u7b97\uff0c\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u591a\u500b\u805a\u5408\u64cd\u4f5c\u7b26\u4f86\u9054\u6210\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-BcNrEWmqRu\">\u7e3d\u7d50<\/h2>\n<p>MongoDB\u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u5b57\u6bb5\u76f8\u6e1b\u64cd\u4f5c\u6642\uff0c\u805a\u5408\u7ba1\u9053\u4f7f\u5f97\u9019\u4e00\u904e\u7a0b\u8b8a\u5f97\u7c21\u55ae\u800c\u9ad8\u6548\u3002\u901a\u904e\u672c\u6587\u7684\u4ecb\u7d39\uff0c\u60a8\u61c9\u8a72\u80fd\u5920\u5728\u81ea\u5df1\u7684\u61c9\u7528\u4e2d\u5be6\u73fe\u985e\u4f3c\u7684\u529f\u80fd\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u90e8\u7f72\u60a8\u7684MongoDB\u5be6\u4f8b\uff0c\u4ee5\u7372\u5f97\u66f4\u597d\u7684\u6027\u80fd\u548c\u53ef\u64f4\u5c55\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728MongoDB\u4e2d\u9032\u884c\u5b57\u6bb5\u76f8\u6e1b\u64cd\u4f5c\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u67e5\u8a62\u548c\u5206\u6790\u904e\u7a0b\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-183802","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183802","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=183802"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183802\/revisions"}],"predecessor-version":[{"id":183803,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183802\/revisions\/183803"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=183802"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=183802"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=183802"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}