{"id":175843,"date":"2024-11-08T09:27:17","date_gmt":"2024-11-08T01:27:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175843\/"},"modified":"2024-11-08T09:27:18","modified_gmt":"2024-11-08T01:27:18","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mongodb%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc-21-%e7%a9%ba%e6%95%b8%e7%b5%84%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175843\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9MongoDB\u932f\u8aa4\u4ee3\u78bc &#8211; 21 &#8211; \u7a7a\u6578\u7d44\u64cd\u4f5c"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9mongodb%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc-21-%e7%a9%ba%e6%95%b8%e7%b5%84%e6%93%8d%e4%bd%9c-gjaPNrjRiC\">\u5982\u4f55\u4fee\u5fa9MongoDB\u932f\u8aa4\u4ee3\u78bc &#8211; 21 &#8211; \u7a7a\u6578\u7d44\u64cd\u4f5c<\/h1>\n<p>\u5728\u4f7f\u7528MongoDB\u7684\u904e\u7a0b\u4e2d\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u4ee3\u78bc\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa4\u4ee3\u78bc21\uff0c\u9019\u901a\u5e38\u8868\u793a\u7a7a\u6578\u7d44\u64cd\u4f5c\u3002\u9019\u500b\u932f\u8aa4\u53ef\u80fd\u6703\u5c0e\u81f4\u61c9\u7528\u7a0b\u5e8f\u7121\u6cd5\u6b63\u5e38\u904b\u884c\uff0c\u56e0\u6b64\u4e86\u89e3\u5982\u4f55\u4fee\u5fa9\u9019\u500b\u554f\u984c\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc21%e7%9a%84%e5%8e%9f%e5%9b%a0-gjaPNrjRiC\">\u932f\u8aa4\u4ee3\u78bc21\u7684\u539f\u56e0<\/h2>\n<p>\u932f\u8aa4\u4ee3\u78bc21\u901a\u5e38\u51fa\u73fe\u5728\u5617\u8a66\u5c0d\u4e00\u500b\u7a7a\u6578\u7d44\u9032\u884c\u64cd\u4f5c\u6642\u3002\u9019\u53ef\u80fd\u662f\u56e0\u70ba\u5728\u67e5\u8a62\u6216\u66f4\u65b0\u6578\u64da\u6642\uff0c\u6578\u7d44\u7684\u5167\u5bb9\u70ba\u7a7a\uff0c\u6216\u8005\u5728\u9032\u884c\u805a\u5408\u64cd\u4f5c\u6642\u6c92\u6709\u63d0\u4f9b\u6709\u6548\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u5728\u63d2\u5165\u6216\u66f4\u65b0\u6587\u6a94\u6642\uff0c\u6578\u7d44\u5b57\u6bb5\u672a\u6b63\u78ba\u521d\u59cb\u5316\u3002<\/li>\n<li>\u5728\u67e5\u8a62\u6642\uff0c\u4f7f\u7528\u4e86\u4e0d\u6b63\u78ba\u7684\u904e\u6ffe\u689d\u4ef6\uff0c\u5c0e\u81f4\u8fd4\u56de\u7684\u6578\u7d44\u70ba\u7a7a\u3002<\/li>\n<li>\u5728\u805a\u5408\u7ba1\u9053\u4e2d\uff0c\u67d0\u4e9b\u64cd\u4f5c\u672a\u80fd\u6b63\u78ba\u8655\u7406\u6578\u7d44\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc21-gjaPNrjRiC\">\u5982\u4f55\u4fee\u5fa9\u932f\u8aa4\u4ee3\u78bc21<\/h2>\n<p>\u4fee\u5fa9\u932f\u8aa4\u4ee3\u78bc21\u7684\u7b2c\u4e00\u6b65\u662f\u78ba\u5b9a\u554f\u984c\u7684\u6839\u6e90\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5177\u9ad4\u7684\u6b65\u9a5f\u548c\u5efa\u8b70\uff1a<\/p>\n<h3 id=\"1-%e6%aa%a2%e6%9f%a5%e6%95%b8%e6%93%9a%e7%b5%90%e6%a7%8b-gjaPNrjRiC\">1. \u6aa2\u67e5\u6578\u64da\u7d50\u69cb<\/h3>\n<p>\u9996\u5148\uff0c\u6aa2\u67e5MongoDB\u4e2d\u7684\u6578\u64da\u7d50\u69cb\uff0c\u78ba\u4fdd\u6578\u7d44\u5b57\u6bb5\u5df2\u6b63\u78ba\u521d\u59cb\u5316\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6709\u4e00\u500b\u7528\u6236\u6587\u6a94\uff0c\u4e26\u4e14\u8a72\u6587\u6a94\u5305\u542b\u4e00\u500b\u540d\u70ba\u201ctags\u201d\u7684\u6578\u7d44\uff0c\u8acb\u78ba\u4fdd\u5728\u63d2\u5165\u6587\u6a94\u6642\uff0c\u8a72\u6578\u7d44\u4e0d\u662f\u7a7a\u7684\uff1a<\/p>\n<pre><code>{\n    \"username\": \"exampleUser\",\n    \"tags\": []  \/\/ \u78ba\u4fdd\u9019\u88e1\u4e0d\u662f\u7a7a\u6578\u7d44\n}\n<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e6%9c%89%e6%95%88%e7%9a%84%e6%9f%a5%e8%a9%a2%e6%a2%9d%e4%bb%b6-gjaPNrjRiC\">2. \u4f7f\u7528\u6709\u6548\u7684\u67e5\u8a62\u689d\u4ef6<\/h3>\n<p>\u5728\u67e5\u8a62\u6578\u64da\u6642\uff0c\u78ba\u4fdd\u4f7f\u7528\u7684\u904e\u6ffe\u689d\u4ef6\u662f\u6b63\u78ba\u7684\u3002\u5982\u679c\u67e5\u8a62\u8fd4\u56de\u7684\u6578\u7d44\u70ba\u7a7a\uff0c\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u932f\u8aa4\u4ee3\u78bc21\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<pre><code>db.users.find({ \"tags\": { $exists: true, $ne: [] } })<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5305\u542b\u975e\u7a7a\u201ctags\u201d\u6578\u7d44\u7684\u7528\u6236\u3002<\/p>\n<h3 id=\"3-%e6%aa%a2%e6%9f%a5%e8%81%9a%e5%90%88%e6%93%8d%e4%bd%9c-gjaPNrjRiC\">3. \u6aa2\u67e5\u805a\u5408\u64cd\u4f5c<\/h3>\n<p>\u5982\u679c\u4f60\u5728\u4f7f\u7528\u805a\u5408\u7ba1\u9053\u6642\u9047\u5230\u6b64\u932f\u8aa4\uff0c\u8acb\u6aa2\u67e5\u6bcf\u500b\u968e\u6bb5\u7684\u8f38\u5165\u548c\u8f38\u51fa\u3002\u78ba\u4fdd\u5728\u9032\u884c\u64cd\u4f5c\u4e4b\u524d\uff0c\u6578\u7d44\u5b57\u6bb5\u5df2\u6b63\u78ba\u586b\u5145\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>db.users.aggregate([\n    { $match: { \"tags\": { $exists: true, $ne: [] } } },\n    { $unwind: \"$tags\" },\n    { $group: { _id: \"$tags\", count: { $sum: 1 } } }\n])<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c$unwind\u64cd\u4f5c\u5c07\u6578\u7d44\u5c55\u958b\uff0c\u4e26\u4e14\u53ea\u6709\u5728\u201ctags\u201d\u6578\u7d44\u4e0d\u70ba\u7a7a\u7684\u60c5\u6cc1\u4e0b\u624d\u6703\u9032\u884c\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-gjaPNrjRiC\">\u7e3d\u7d50<\/h2>\n<p>\u4fee\u5fa9MongoDB\u932f\u8aa4\u4ee3\u78bc21 &#8211; \u7a7a\u6578\u7d44\u64cd\u4f5c\u7684\u95dc\u9375\u5728\u65bc\u78ba\u4fdd\u6578\u64da\u7d50\u69cb\u7684\u6b63\u78ba\u6027\u3001\u4f7f\u7528\u6709\u6548\u7684\u67e5\u8a62\u689d\u4ef6\u4ee5\u53ca\u6aa2\u67e5\u805a\u5408\u64cd\u4f5c\u7684\u6bcf\u500b\u968e\u6bb5\u3002\u901a\u904e\u9019\u4e9b\u6b65\u9a5f\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u6b64\u554f\u984c\uff0c\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u66f4\u591a\u6709\u95dc<em><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/em>\u548c<em><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/em>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8a73\u7d30\u8cc7\u6599\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u5fa9MongoDB\u932f\u8aa4\u4ee3\u78bc21\uff0c\u89e3\u6c7a\u7a7a\u6578\u7d44\u64cd\u4f5c\u554f\u984c\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u7a69\u5b9a\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-175843","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175843","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=175843"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175843\/revisions"}],"predecessor-version":[{"id":175844,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175843\/revisions\/175844"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=175843"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=175843"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=175843"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}