{"id":63756,"date":"2024-10-14T02:13:14","date_gmt":"2024-10-13T18:13:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/63756\/"},"modified":"2024-10-14T02:13:14","modified_gmt":"2024-10-13T18:13:14","slug":"mongodb%e8%a1%93%e8%aa%9e-%e7%b4%af%e5%8a%a0%e5%99%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/63756\/","title":{"rendered":"MongoDB\u8853\u8a9e &#8211; \u7d2f\u52a0\u5668"},"content":{"rendered":"<h1 id=\"mongodb%e8%a1%93%e8%aa%9e-%e7%b4%af%e5%8a%a0%e5%99%a8-zXLxOCoMsj\">MongoDB\u8853\u8a9e &#8211; \u7d2f\u52a0\u5668<\/h1>\n<p>\u5728MongoDB\u4e2d\uff0c\u7d2f\u52a0\u5668\uff08Accumulator\uff09\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u904b\u7b97\u7b26\uff0c\u7528\u65bc\u5728\u805a\u5408\u7ba1\u9053\u4e2d\u9032\u884c\u6578\u64da\u7684\u8a08\u7b97\u548c\u5f59\u7e3d\u3002\u7d2f\u52a0\u5668\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5c0d\u6578\u64da\u9032\u884c\u805a\u5408\u64cd\u4f5c\uff0c\u9019\u4e9b\u64cd\u4f5c\u53ef\u4ee5\u5305\u62ec\u8a08\u7b97\u7e3d\u548c\u3001\u8a08\u6578\u3001\u5e73\u5747\u503c\u7b49\u3002\u9019\u4e9b\u529f\u80fd\u4f7f\u5f97MongoDB\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u80fd\u5920\u9ad8\u6548\u5730\u9032\u884c\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u751f\u6210\u3002<\/p>\n<h2 id=\"%e7%b4%af%e5%8a%a0%e5%99%a8%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-zXLxOCoMsj\">\u7d2f\u52a0\u5668\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u7d2f\u52a0\u5668\u901a\u5e38\u7528\u65bcMongoDB\u7684\u805a\u5408\u6846\u67b6\u4e2d\uff0c\u9019\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u5141\u8a31\u7528\u6236\u5c0d\u6578\u64da\u9032\u884c\u8907\u96dc\u7684\u67e5\u8a62\u548c\u8f49\u63db\u3002\u7d2f\u52a0\u5668\u7684\u4f7f\u7528\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5f9e\u539f\u59cb\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u7528\u7684\u4fe1\u606f\uff0c\u4e26\u9032\u884c\u9032\u4e00\u6b65\u7684\u5206\u6790\u3002<\/p>\n<h3 id=\"%e5%b8%b8%e8%a6%8b%e7%9a%84%e7%b4%af%e5%8a%a0%e5%99%a8%e9%a1%9e%e5%9e%8b-zXLxOCoMsj\">\u5e38\u898b\u7684\u7d2f\u52a0\u5668\u985e\u578b<\/h3>\n<ul>\n<li><code>$sum<\/code>\uff1a\u8a08\u7b97\u6578\u5b57\u5b57\u6bb5\u7684\u7e3d\u548c\u3002<\/li>\n<li><code>$avg<\/code>\uff1a\u8a08\u7b97\u6578\u5b57\u5b57\u6bb5\u7684\u5e73\u5747\u503c\u3002<\/li>\n<li><code>$min<\/code>\uff1a\u627e\u51fa\u6578\u5b57\u5b57\u6bb5\u7684\u6700\u5c0f\u503c\u3002<\/li>\n<li><code>$max<\/code>\uff1a\u627e\u51fa\u6578\u5b57\u5b57\u6bb5\u7684\u6700\u5927\u503c\u3002<\/li>\n<li><code>$push<\/code>\uff1a\u5c07\u503c\u6dfb\u52a0\u5230\u6578\u7d44\u4e2d\u3002<\/li>\n<li><code>$addToSet<\/code>\uff1a\u5c07\u552f\u4e00\u503c\u6dfb\u52a0\u5230\u6578\u7d44\u4e2d\u3002<\/li>\n<li><code>$first<\/code>\uff1a\u8fd4\u56de\u5206\u7d44\u4e2d\u7684\u7b2c\u4e00\u500b\u503c\u3002<\/li>\n<li><code>$last<\/code>\uff1a\u8fd4\u56de\u5206\u7d44\u4e2d\u7684\u6700\u5f8c\u4e00\u500b\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b4%af%e5%8a%a0%e5%99%a8%e7%9a%84%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-zXLxOCoMsj\">\u7d2f\u52a0\u5668\u7684\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u7d2f\u52a0\u5668\u7684\u7c21\u55ae\u7bc4\u4f8b\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>sales<\/code>\u7684\u96c6\u5408\uff0c\u8a72\u96c6\u5408\u5305\u542b\u4e86\u6bcf\u7b46\u92b7\u552e\u7684\u91d1\u984d\u548c\u65e5\u671f\u3002<\/p>\n<pre><code>{\n    \"_id\": 1,\n    \"amount\": 100,\n    \"date\": \"2023-01-01\"\n},\n{\n    \"_id\": 2,\n    \"amount\": 200,\n    \"date\": \"2023-01-02\"\n},\n{\n    \"_id\": 3,\n    \"amount\": 150,\n    \"date\": \"2023-01-01\"\n}\n<\/code><\/pre>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u805a\u5408\u7ba1\u9053\u4f86\u8a08\u7b97\u6bcf\u5929\u7684\u7e3d\u92b7\u552e\u984d\uff1a<\/p>\n<pre><code>db.sales.aggregate([\n    {\n        $group: {\n            _id: \"$date\",\n            totalSales: { $sum: \"$amount\" }\n        }\n    }\n])\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86<code>$group<\/code>\u64cd\u4f5c\u7b26\u4f86\u6839\u64da\u65e5\u671f\u9032\u884c\u5206\u7d44\uff0c\u4e26\u4f7f\u7528<code>$sum<\/code>\u7d2f\u52a0\u5668\u4f86\u8a08\u7b97\u6bcf\u4e00\u5929\u7684\u7e3d\u92b7\u552e\u984d\u3002\u7d50\u679c\u5c07\u6703\u662f\u6bcf\u4e00\u5929\u7684\u65e5\u671f\u53ca\u5176\u5c0d\u61c9\u7684\u7e3d\u92b7\u552e\u984d\u3002<\/p>\n<h2 id=\"%e7%b4%af%e5%8a%a0%e5%99%a8%e7%9a%84%e5%84%aa%e5%8b%a2-zXLxOCoMsj\">\u7d2f\u52a0\u5668\u7684\u512a\u52e2<\/h2>\n<p>\u4f7f\u7528\u7d2f\u52a0\u5668\u7684\u4e3b\u8981\u512a\u52e2\u5728\u65bc\u5176\u9ad8\u6548\u6027\u548c\u9748\u6d3b\u6027\u3002MongoDB\u7684\u805a\u5408\u6846\u67b6\u80fd\u5920\u5728\u6578\u64da\u5eab\u5c64\u9762\u9032\u884c\u8a08\u7b97\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u61c9\u7528\u5c64\u7684\u8ca0\u64d4\uff0c\u4e26\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u6b64\u5916\uff0c\u7d2f\u52a0\u5668\u652f\u6301\u591a\u7a2e\u6578\u64da\u985e\u578b\u548c\u64cd\u4f5c\uff0c\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u6839\u64da\u9700\u6c42\u9032\u884c\u81ea\u5b9a\u7fa9\u7684\u6578\u64da\u8655\u7406\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-zXLxOCoMsj\">\u7e3d\u7d50<\/h2>\n<p>\u7d2f\u52a0\u5668\u5728MongoDB\u7684\u805a\u5408\u6846\u67b6\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u9ad8\u6548\u5730\u9032\u884c\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u751f\u6210\u3002\u901a\u904e\u4f7f\u7528\u5404\u7a2e\u7d2f\u52a0\u5668\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u5f9e\u5927\u91cf\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u7528\u7684\u4fe1\u606f\uff0c\u4e26\u9032\u884c\u9032\u4e00\u6b65\u7684\u5206\u6790\u3002\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u61c9\u7528\u4e2d\u4f7f\u7528MongoDB\u7684\u7d2f\u52a0\u5668\u6709\u8208\u8da3\uff0c\u6216\u662f\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u4f86\u63d0\u5347\u60a8\u7684\u6578\u64da\u5eab\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MongoDB\u4e2d\u7684\u7d2f\u52a0\u5668\u8853\u8a9e\uff0c\u63a2\u7d22\u5176\u5728\u6578\u64da\u805a\u5408\u4e2d\u7684\u61c9\u7528\u8207\u529f\u80fd\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\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-63756","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/63756","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=63756"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/63756\/revisions"}],"predecessor-version":[{"id":63757,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/63756\/revisions\/63757"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=63756"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=63756"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=63756"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}