{"id":21554,"date":"2024-01-02T11:24:27","date_gmt":"2024-01-02T11:24:27","guid":{"rendered":"https:\/\/server.hk\/blog\/21554\/"},"modified":"2024-11-14T10:30:50","modified_gmt":"2024-11-14T02:30:50","slug":"mongodb-glossary-view","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/21554\/","title":{"rendered":"MongoDB\u8a5e\u5f59\u8868 &#8211; \u8996\u5716"},"content":{"rendered":"<h1 id=\"mongodb-glossary-view-amckuBvXjw\">MongoDB\u8a5e\u5f59\u8868 &#8211; \u8996\u5716<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7684\u4e16\u754c\u4e2d\uff0cMongoDB\u56e0\u5176\u9748\u6d3b\u6027\u3001\u53ef\u64f4\u5c55\u6027\u548c\u6613\u7528\u6027\u800c\u5ee3\u53d7\u9752\u775e\u3002\u8207\u4efb\u4f55\u6578\u64da\u5eab\u7cfb\u7d71\u4e00\u6a23\uff0cMongoDB\u64c1\u6709\u4e00\u5957\u7368\u7279\u7684\u8853\u8a9e\uff0c\u4f7f\u7528\u8005\u61c9\u7576\u719f\u6089\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0eMongoDB\u4e2d\u7684\u300c\u8996\u5716\u300d\u6982\u5ff5\uff0c\u4e26\u4e86\u89e3\u5176\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"what-is-a-view-amckuBvXjw\">\u4ec0\u9ebc\u662f\u8996\u5716\uff1f<\/h2>\n<p>\u5728MongoDB\u4e2d\uff0c\u8996\u5716\u662f\u4e00\u7a2e\u865b\u64ec\u6587\u6a94\u96c6\u5408\uff0c\u6e90\u81ea\u65bc\u73fe\u6709\u7684\u96c6\u5408\u6216\u591a\u500b\u96c6\u5408\u3002\u5b83\u985e\u4f3c\u65bc\u50b3\u7d71\u95dc\u806f\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u5eab\u8996\u5716\uff0c\u63d0\u4f9b\u4e86\u4e00\u5c64\u5c0d\u5e95\u5c64\u6578\u64da\u7684\u62bd\u8c61\u3002\u8996\u5716\u5141\u8a31\u4f7f\u7528\u8005\u5b9a\u7fa9\u6578\u64da\u7684\u81ea\u5b9a\u7fa9\u8996\u89d2\uff0c\u800c\u7121\u9700\u4fee\u6539\u539f\u59cb\u96c6\u5408\u3002<\/p>\n<p>\u8996\u5716\u70ba\u53ea\u8b80\uff0c\u9019\u610f\u5473\u8457\u5c0d\u8996\u5716\u6240\u505a\u7684\u4efb\u4f55\u4fee\u6539\u4e0d\u6703\u5f71\u97ff\u539f\u59cb\u6578\u64da\u3002\u5b83\u5011\u4e3b\u8981\u7528\u65bc\u7c21\u5316\u8907\u96dc\u67e5\u8a62\u3001\u589e\u5f37\u6578\u64da\u5b89\u5168\u6027\uff0c\u4ee5\u53ca\u901a\u904e\u9810\u5148\u8a08\u7b97\u7d93\u5e38\u8a2a\u554f\u7684\u6578\u64da\u4f86\u6539\u5584\u6027\u80fd\u3002<\/p>\n<h2 id=\"creating-a-view-amckuBvXjw\">\u5275\u5efa\u8996\u5716<\/h2>\n<p>\u8981\u5728MongoDB\u4e2d\u5275\u5efa\u8996\u5716\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528<code>$merge<\/code>\u805a\u5408\u968e\u6bb5\u6216<code>createView()<\/code>\u65b9\u6cd5\u3002\u8b93\u6211\u5011\u4f86\u770b\u770b\u9019\u5169\u7a2e\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"using-merge-aggregation-stage-amckuBvXjw\">\u4f7f\u7528$merge\u805a\u5408\u968e\u6bb5<\/h3>\n<pre><code>db.createView(\"viewName\", \"sourceCollection\", [\r\n  { $match: { status: \"active\" } },\r\n  { $project: { _id: 0, name: 1, age: 1 } },\r\n  { $sort: { age: -1 } }\r\n])\r\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u6839\u64da\u300csourceCollection\u300d\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba\u300cviewName\u300d\u7684\u8996\u5716\u3002<code>$match<\/code>\u968e\u6bb5\u904e\u6ffe\u4e86\u300cstatus\u300d\u5b57\u6bb5\u8a2d\u70ba\u300cactive\u300d\u7684\u6587\u6a94\u3002<code>$project<\/code>\u968e\u6bb5\u6307\u5b9a\u4e86\u5728\u8996\u5716\u4e2d\u5305\u62ec\u6216\u6392\u9664\u7684\u5b57\u6bb5\uff0c\u800c<code>$sort<\/code>\u968e\u6bb5\u5247\u6839\u64da\u300cage\u300d\u5b57\u6bb5\u6309\u964d\u5e8f\u6392\u5e8f\u6587\u6a94\u3002<\/p>\n<h3 id=\"using-createview-method-amckuBvXjw\">\u4f7f\u7528createView()\u65b9\u6cd5<\/h3>\n<pre><code>db.runCommand({\r\n  create: \"viewName\",\r\n  viewOn: \"sourceCollection\",\r\n  pipeline: [\r\n    { $match: { status: \"active\" } },\r\n    { $project: { _id: 0, name: 1, age: 1 } },\r\n    { $sort: { age: -1 } }\r\n  ]\r\n})\r\n<\/code><\/pre>\n<p><code>createView()<\/code>\u65b9\u6cd5\u9075\u5faa\u985e\u4f3c\u7684\u65b9\u5f0f\uff0c\u60a8\u53ea\u9700\u6307\u5b9a\u8996\u5716\u540d\u7a31\u3001\u6e90\u96c6\u5408\u4ee5\u53ca\u805a\u5408\u7ba1\u9053\u968e\u6bb5\u4f86\u5b9a\u7fa9\u8996\u5716\u7684\u7d50\u69cb\u3002<\/p>\n<h2 id=\"using-views-amckuBvXjw\">\u4f7f\u7528\u8996\u5716<\/h2>\n<p>\u5275\u5efa\u8996\u5716\u5f8c\uff0c\u60a8\u53ef\u4ee5\u50cf\u67e5\u8a62MongoDB\u4e2d\u7684\u5176\u4ed6\u96c6\u5408\u4e00\u6a23\u67e5\u8a62\u5b83\u3002\u8996\u5716\u652f\u6301\u6240\u6709\u8b80\u53d6\u64cd\u4f5c\uff0c\u5305\u62ec\u67e5\u627e\u3001\u805a\u5408\u548cMap-Reduce\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>db.viewName.find({ age: { $gt: 30 } })\r\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u6aa2\u7d22\u6240\u6709\u300cviewName\u300d\u8996\u5716\u4e2d\u7684\u6587\u6a94\uff0c\u5176\u300cage\u300d\u5b57\u6bb5\u5927\u65bc30\u3002<\/p>\n<h2 id=\"benefits-of-using-views-amckuBvXjw\">\u4f7f\u7528\u8996\u5716\u7684\u597d\u8655<\/h2>\n<p>\u8996\u5716\u5728MongoDB\u4e2d\u63d0\u4f9b\u4e86\u5e7e\u500b\u512a\u52e2\uff1a<\/p>\n<ul>\n<li><strong>\u7c21\u5316\u67e5\u8a62\uff1a<\/strong>\u8996\u5716\u5141\u8a31\u60a8\u5b9a\u7fa9\u8907\u96dc\u7684\u67e5\u8a62\u4e00\u6b21\uff0c\u4e26\u5728\u591a\u500b\u61c9\u7528\u6216\u67e5\u8a62\u4e2d\u91cd\u7528\u5b83\u5011\u3002<\/li>\n<li><strong>\u6578\u64da\u5b89\u5168\uff1a<\/strong>\u901a\u904e\u5275\u5efa\u9650\u5236\u5b57\u6bb5\u7684\u8996\u5716\uff0c\u60a8\u53ef\u4ee5\u63a7\u5236\u4e0d\u540c\u4f7f\u7528\u8005\u6216\u61c9\u7528\u6240\u66b4\u9732\u7684\u6578\u64da\uff0c\u589e\u5f37\u5b89\u5168\u6027\u3002<\/li>\n<li><strong>\u6027\u80fd\u512a\u5316\uff1a<\/strong>\u8996\u5716\u53ef\u4ee5\u7528\u65bc\u9810\u8a08\u7b97\u7d93\u5e38\u8a2a\u554f\u7684\u6578\u64da\uff0c\u901a\u904e\u6e1b\u5c11\u8907\u96dc\u8a08\u7b97\u7684\u9700\u8981\u4f86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"conclusion-amckuBvXjw\">\u7d50\u8ad6<\/h2>\n<p>MongoDB\u4e2d\u7684\u8996\u5716\u63d0\u4f9b\u4e86\u4e00\u7a2e\u5f37\u6709\u529b\u7684\u6a5f\u5236\uff0c\u4f7f\u4f7f\u7528\u8005\u80fd\u5920\u5728\u4e0d\u4fee\u6539\u539f\u59cb\u96c6\u5408\u7684\u60c5\u6cc1\u4e0b\u5275\u5efa\u6578\u64da\u7684\u81ea\u5b9a\u7fa9\u8996\u89d2\u3002\u5b83\u5011\u7c21\u5316\u4e86\u67e5\u8a62\uff0c\u589e\u5f37\u4e86\u6578\u64da\u5b89\u5168\u6027\uff0c\u4e26\u6539\u5584\u4e86\u6027\u80fd\u3002\u901a\u904e\u5229\u7528\u8996\u5716\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u548c\u5206\u6790MongoDB\u4e2d\u7684\u6578\u64da\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u6709\u95dcMongoDB\u53ca\u5176\u529f\u80fd\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u63a2\u7d22<a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u9019\u662f\u4e00\u5bb6\u9818\u5148\u7684VPS\u4e3b\u6a5f\u516c\u53f8\uff0c\u63d0\u4f9b\u53ef\u9760\u548c\u53ef\u64f4\u5c55\u7684\u4e3b\u6a5f\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MongoDB\u8a5e\u5f59\u8868 &#038;#821&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-21554","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21554","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=21554"}],"version-history":[{"count":2,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21554\/revisions"}],"predecessor-version":[{"id":23895,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21554\/revisions\/23895"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21554"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21554"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}