{"id":247336,"date":"2024-01-02T20:38:19","date_gmt":"2024-01-02T12:38:19","guid":{"rendered":"https:\/\/www.idc.net\/help\/247336\/"},"modified":"2024-01-02T20:38:19","modified_gmt":"2024-01-02T12:38:19","slug":"mongodb-%e6%9c%af%e8%af%ad-%e7%ae%a1%e9%81%93","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/247336\/","title":{"rendered":"MongoDB \u672f\u8bed &#8211; \u7ba1\u9053"},"content":{"rendered":"<p><title>MongoDB \u672f\u8bed - \u7ba1\u9053<\/title><\/p>\n<h1 id=\"mongodb-%e6%9c%af%e8%af%ad-%e7%ae%a1%e9%81%93-xpmvVCNchf\"> MongoDB \u672f\u8bed - \u7ba1\u9053 <\/h1>\n<p>\u5728MongoDB\u4e2d\uff0c\u7ba1\u9053\uff08pipeline\uff09\u662f\u4e00\u79cd\u7528\u4e8e\u5904\u7406\u6570\u636e\u7684\u6982\u5ff5\u3002\u5b83\u5141\u8bb8\u7528\u6237\u5bf9\u6570\u636e\u8fdb\u884c\u591a\u4e2a\u9636\u6bb5\u7684\u8f6c\u6362\u548c\u64cd\u4f5c\uff0c\u4ee5\u4fbf\u6ee1\u8db3\u7279\u5b9a\u7684\u67e5\u8be2\u9700\u6c42\u3002<\/p>\n<h2 id=\"%e7%ae%a1%e9%81%93%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-xpmvVCNchf\">\u7ba1\u9053\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u7ba1\u9053\u662f\u7531\u4e00\u7cfb\u5217\u64cd\u4f5c\u7b26\u7ec4\u6210\u7684\uff0c\u6bcf\u4e2a\u64cd\u4f5c\u7b26\u90fd\u4f1a\u5bf9\u8f93\u5165\u6570\u636e\u8fdb\u884c\u5904\u7406\uff0c\u5e76\u5c06\u7ed3\u679c\u4f20\u9012\u7ed9\u4e0b\u4e00\u4e2a\u64cd\u4f5c\u7b26\u3002\u8fd9\u79cd\u65b9\u5f0f\u7c7b\u4f3c\u4e8eUNIX\u4e2d\u7684\u7ba1\u9053\u64cd\u4f5c\u7b26\uff08|\uff09\uff0c\u53ef\u4ee5\u5c06\u591a\u4e2a\u547d\u4ee4\u8fde\u63a5\u5728\u4e00\u8d77\uff0c\u4ee5\u4fbf\u5bf9\u6570\u636e\u8fdb\u884c\u8fde\u7eed\u5904\u7406\u3002<\/p>\n<p>\u5728MongoDB\u4e2d\uff0c\u7ba1\u9053\u64cd\u4f5c\u7b26\u53ef\u4ee5\u7528\u4e8e\u5bf9\u6587\u6863\u8fdb\u884c\u7b5b\u9009\u3001\u6392\u5e8f\u3001\u5206\u7ec4\u3001\u805a\u5408\u7b49\u64cd\u4f5c\u3002\u901a\u8fc7\u5c06\u591a\u4e2a\u64cd\u4f5c\u7b26\u7ec4\u5408\u5728\u4e00\u8d77\uff0c\u53ef\u4ee5\u6784\u5efa\u590d\u6742\u7684\u67e5\u8be2\u548c\u6570\u636e\u5904\u7406\u903b\u8f91\u3002<\/p>\n<h2 id=\"%e7%ae%a1%e9%81%93%e6%93%8d%e4%bd%9c%e7%ac%a6-xpmvVCNchf\">\u7ba1\u9053\u64cd\u4f5c\u7b26<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u7ba1\u9053\u64cd\u4f5c\u7b26\uff1a<\/p>\n<ul>\n<li><code>$match<\/code>\uff1a\u7528\u4e8e\u7b5b\u9009\u6587\u6863\uff0c\u53ea\u8f93\u51fa\u7b26\u5408\u6761\u4ef6\u7684\u6587\u6863\u3002<\/li>\n<li><code>$sort<\/code>\uff1a\u7528\u4e8e\u5bf9\u6587\u6863\u8fdb\u884c\u6392\u5e8f\u3002<\/li>\n<li><code>$group<\/code>\uff1a\u7528\u4e8e\u5bf9\u6587\u6863\u8fdb\u884c\u5206\u7ec4\u3002<\/li>\n<li><code>$project<\/code>\uff1a\u7528\u4e8e\u5bf9\u6587\u6863\u8fdb\u884c\u6295\u5f71\uff0c\u53ea\u8f93\u51fa\u6307\u5b9a\u7684\u5b57\u6bb5\u3002<\/li>\n<li><code>$limit<\/code>\uff1a\u7528\u4e8e\u9650\u5236\u8f93\u51fa\u6587\u6863\u7684\u6570\u91cf\u3002<\/li>\n<li><code>$skip<\/code>\uff1a\u7528\u4e8e\u8df3\u8fc7\u6307\u5b9a\u6570\u91cf\u7684\u6587\u6863\u3002<\/li>\n<li><code>$unwind<\/code>\uff1a\u7528\u4e8e\u5c55\u5f00\u6570\u7ec4\u5b57\u6bb5\u3002<\/li>\n<li><code>$lookup<\/code>\uff1a\u7528\u4e8e\u5728\u4e0d\u540c\u7684\u96c6\u5408\u4e4b\u95f4\u8fdb\u884c\u5173\u8054\u67e5\u8be2\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%a4%ba%e4%be%8b-xpmvVCNchf\">\u793a\u4f8b<\/h2>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528\u7ba1\u9053\u64cd\u4f5c\u7b26\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>\ndb.orders.aggregate([\n  { $match: { status: \"completed\" } },\n  { $group: { _id: \"$customer\", total: { $sum: \"$amount\" } } },\n  { $sort: { total: -1 } },\n  { $limit: 10 }\n])\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u9996\u5148\u4f7f\u7528<code>$match<\/code>\u64cd\u4f5c\u7b26\u7b5b\u9009\u51fa\u72b6\u6001\u4e3a\"completed\"\u7684\u8ba2\u5355\uff0c\u7136\u540e\u4f7f\u7528<code>$group<\/code>\u64cd\u4f5c\u7b26\u6309\u5ba2\u6237\u8fdb\u884c\u5206\u7ec4\uff0c\u5e76\u8ba1\u7b97\u6bcf\u4e2a\u5ba2\u6237\u7684\u8ba2\u5355\u603b\u91d1\u989d\u3002\u63a5\u7740\u4f7f\u7528<code>$sort<\/code>\u64cd\u4f5c\u7b26\u5bf9\u7ed3\u679c\u6309\u603b\u91d1\u989d\u8fdb\u884c\u964d\u5e8f\u6392\u5e8f\uff0c\u6700\u540e\u4f7f\u7528<code>$limit<\/code>\u64cd\u4f5c\u7b26\u9650\u5236\u8f93\u51fa\u7ed3\u679c\u7684\u6570\u91cf\u4e3a10\u3002<\/p>\n<h2 id=\"%e6%80%bb%e7%bb%93-xpmvVCNchf\">\u603b\u7ed3<\/h2>\n<p>\u7ba1\u9053\u662fMongoDB\u4e2d\u7528\u4e8e\u5904\u7406\u6570\u636e\u7684\u91cd\u8981\u6982\u5ff5\u3002\u901a\u8fc7\u4f7f\u7528\u7ba1\u9053\u64cd\u4f5c\u7b26\uff0c\u7528\u6237\u53ef\u4ee5\u5bf9\u6570\u636e\u8fdb\u884c\u591a\u4e2a\u9636\u6bb5\u7684\u8f6c\u6362\u548c\u64cd\u4f5c\uff0c\u4ee5\u6ee1\u8db3\u7279\u5b9a\u7684\u67e5\u8be2\u9700\u6c42\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5408\u7406\u4f7f\u7528\u7ba1\u9053\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u548c\u7075\u6d3b\u6027\u3002<\/p>\n<p>\u9999\u6e2f\u670d\u52a1\u5668\u9996\u9009\u540e\u6d6a\u4e91\uff0c\u6b22\u8fce\u8bbf\u95ee\u6211\u4eec\u7684\u5b98\u7f51\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff1a<a href=\"https:\/\/idc.net\">https:\/\/idc.net<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>MongoDB \u672f\u8bed - \u7ba1\u9053 MongoDB \u672f\u8bed - \u7ba1\u9053 \u5728MongoDB\u4e2d\uff0c\u7ba1\u9053\uff08pipeline\uff09\u662f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7038],"tags":[],"class_list":["post-247336","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/247336","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=247336"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/247336\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=247336"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=247336"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=247336"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}