{"id":21588,"date":"2024-01-02T11:58:26","date_gmt":"2024-01-02T11:58:26","guid":{"rendered":"https:\/\/server.hk\/blog\/21588\/"},"modified":"2024-11-14T10:30:14","modified_gmt":"2024-11-14T02:30:14","slug":"mongodb-glossary-stage","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/21588\/","title":{"rendered":"MongoDB \u8a5e\u5f59\u8868 – \u968e\u6bb5"},"content":{"rendered":"

MongoDB \u8a5e\u5f59\u8868 – \u968e\u6bb5<\/h1>\n

\u5728 MongoDB \u7684\u4e16\u754c\u88e1\uff0c\u300c\u968e\u6bb5\u300d\u9019\u500b\u8853\u8a9e\u6307\u7684\u662f\u805a\u5408\u6846\u67b6\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u6982\u5ff5\u3002\u805a\u5408\u6846\u67b6\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u5141\u8a31\u7528\u6236\u5728 MongoDB \u4e2d\u8655\u7406\u548c\u5206\u6790\u6578\u64da\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u7a2e\u9748\u6d3b\u4e14\u9ad8\u6548\u7684\u65b9\u5f0f\u4f86\u8f49\u63db\u548c\u64cd\u4f5c\u6578\u64da\uff0c\u9019\u5c0d\u65bc\u958b\u767c\u8005\u548c\u6578\u64da\u5206\u6790\u5e2b\u4f86\u8aaa\u662f\u4e00\u500b\u5fc5\u4e0d\u53ef\u5c11\u7684\u529f\u80fd\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u805a\u5408\u6846\u67b6\uff1f<\/h2>\n

MongoDB \u4e2d\u7684\u805a\u5408\u6846\u67b6\u662f\u4e00\u500b\u57fa\u65bc\u6d41\u6c34\u7dda\u7684\u6578\u64da\u8655\u7406\u7cfb\u7d71\u3002\u5b83\u5141\u8a31\u7528\u6236\u5728\u6587\u6a94\u96c6\u5408\u4e0a\u9032\u884c\u8907\u96dc\u7684\u6578\u64da\u8f49\u63db\u548c\u5206\u6790\u3002\u9019\u500b\u6846\u67b6\u7531\u4e00\u7cfb\u5217\u7684\u968e\u6bb5\u7d44\u6210\uff0c\u6bcf\u500b\u968e\u6bb5\u8ca0\u8cac\u5c0d\u6578\u64da\u57f7\u884c\u7279\u5b9a\u7684\u64cd\u4f5c\u3002\u9019\u4e9b\u968e\u6bb5\u6309\u9806\u5e8f\u57f7\u884c\uff0c\u4e00\u500b\u968e\u6bb5\u7684\u8f38\u51fa\u4f5c\u70ba\u4e0b\u4e00\u500b\u968e\u6bb5\u7684\u8f38\u5165\u3002<\/p>\n

\u4e86\u89e3\u968e\u6bb5<\/h2>\n

\u805a\u5408\u6846\u67b6\u4e2d\u7684\u968e\u6bb5\u662f\u6578\u64da\u8655\u7406\u7684\u57fa\u672c\u7d44\u4ef6\u3002\u6bcf\u500b\u968e\u6bb5\u5c0d\u6578\u64da\u57f7\u884c\u4e00\u500b\u7279\u5b9a\u7684\u64cd\u4f5c\uff0c\u4e26\u5c07\u7d50\u679c\u50b3\u905e\u5230\u4e0b\u4e00\u500b\u968e\u6bb5\u3002MongoDB \u63d0\u4f9b\u4e86\u591a\u7a2e\u4e0d\u540c\u7684\u968e\u6bb5\uff0c\u6bcf\u500b\u968e\u6bb5\u6709\u5176\u7279\u5b9a\u7684\u7528\u9014\u3002\u6211\u5011\u4f86\u63a2\u7d22\u4e00\u4e9b\u5e38\u7528\u7684\u968e\u6bb5\uff1a<\/p>\n

$match<\/h3>\n

$match \u968e\u6bb5\u7528\u65bc\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u7be9\u9078\u6587\u6a94\u3002\u5b83\u5141\u8a31\u7528\u6236\u53ea\u9078\u64c7\u7b26\u5408\u7d66\u5b9a\u689d\u4ef6\u7684\u6587\u6a94\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u60f3\u6aa2\u7d22\u6240\u6709\u300c\u72c0\u614b\u300d\u5b57\u6bb5\u70ba\u300cactive\u300d\u7684\u6587\u6a94\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 $match \u968e\u6bb5\u4f86\u7be9\u9078\u51fa\u6240\u9700\u7684\u6587\u6a94\u3002<\/p>\n

db.collection.aggregate([\r\n  { $match: { status: \"active\" } }\r\n])\r\n<\/code><\/pre>\n
$group<\/h3>\n
$group \u968e\u6bb5\u7528\u65bc\u6839\u64da\u7279\u5b9a\u5b57\u6bb5\u6216\u5b57\u6bb5\u7d44\u5c0d\u6587\u6a94\u9032\u884c\u5206\u7d44\u3002\u5b83\u5141\u8a31\u7528\u6236\u57f7\u884c\u805a\u5408\u64cd\u4f5c\uff0c\u4f8b\u5982\u8a08\u7b97\u6bcf\u7d44\u4e2d\u7684\u5b57\u6bb5\u7e3d\u548c\u3001\u5e73\u5747\u503c\u6216\u8a08\u6578\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u60f3\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u985e\u5225\u7684\u7e3d\u92b7\u552e\u984d\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 $group \u968e\u6bb5\u6839\u64da\u300ccategory\u300d\u5b57\u6bb5\u5c0d\u6587\u6a94\u9032\u884c\u5206\u7d44\uff0c\u4e26\u8a08\u7b97\u6bcf\u7d44\u4e2d\u7684\u300csales\u300d\u5b57\u6bb5\u7e3d\u548c\u3002<\/p>\n
db.collection.aggregate([\r\n  { $group: { _id: \"$category\", totalSales: { $sum: \"$sales\" } } }\r\n])\r\n<\/code><\/pre>\n
$project<\/h3>\n
$project \u968e\u6bb5\u7528\u65bc\u91cd\u65b0\u5851\u9020\u6587\u6a94\uff0c\u901a\u904e\u5305\u542b\u6216\u6392\u9664\u7279\u5b9a\u5b57\u6bb5\u4f86\u5b9a\u7fa9\u8f38\u51fa\u6587\u6a94\u7684\u7d50\u69cb\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u53ea\u60f3\u6aa2\u7d22\u6bcf\u500b\u6587\u6a94\u4e2d\u7684\u300cname\u300d\u548c\u300cprice\u300d\u5b57\u6bb5\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 $project \u968e\u6bb5\u50c5\u5728\u8f38\u51fa\u4e2d\u5305\u542b\u9019\u4e9b\u5b57\u6bb5\u3002<\/p>\n
db.collection.aggregate([\r\n  { $project: { name: 1, price: 1 } }\r\n])\r\n<\/code><\/pre>\n
\u93c8\u63a5\u968e\u6bb5<\/h2>\n
\u805a\u5408\u6846\u67b6\u7684\u4e00\u500b\u5f37\u5927\u529f\u80fd\u662f\u80fd\u5920\u5c07\u591a\u500b\u968e\u6bb5\u93c8\u63a5\u5728\u4e00\u8d77\u3002\u9019\u5141\u8a31\u7528\u6236\u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u57f7\u884c\u8907\u96dc\u7684\u6578\u64da\u8f49\u63db\u548c\u5206\u6790\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 $match \u968e\u6bb5\u7be9\u9078\u6587\u6a94\uff0c\u4f7f\u7528 $group \u968e\u6bb5\u5c0d\u5176\u9032\u884c\u5206\u7d44\uff0c\u7136\u5f8c\u4f7f\u7528 $project \u968e\u6bb5\u91cd\u65b0\u5851\u9020\u8f38\u51fa\u3002<\/p>\n
db.collection.aggregate([\r\n  { $match: { status: \"active\" } },\r\n  { $group: { _id: \"$category\", totalSales: { $sum: \"$sales\" } } },\r\n  { $project: { category: \"$_id\", totalSales: 1, _id: 0 } }\r\n])\r\n<\/code><\/pre>\n
\u7d50\u8ad6<\/h2>\n
\u968e\u6bb5\u662f MongoDB \u805a\u5408\u6846\u67b6\u4e2d\u7684\u4e00\u500b\u57fa\u672c\u6982\u5ff5\u3002\u5b83\u5141\u8a31\u7528\u6236\u5c0d\u6578\u64da\u57f7\u884c\u5404\u7a2e\u64cd\u4f5c\uff0c\u4f8b\u5982\u7be9\u9078\u3001\u5206\u7d44\u548c\u91cd\u5851\u6578\u64da\u3002\u901a\u904e\u7406\u89e3\u53ef\u7528\u7684\u4e0d\u540c\u968e\u6bb5\u53ca\u5982\u4f55\u5c07\u5b83\u5011\u93c8\u63a5\u5728\u4e00\u8d77\uff0c\u7528\u6236\u53ef\u4ee5\u5229\u7528\u805a\u5408\u6846\u67b6\u7684\u5f37\u5927\u529f\u80fd\u4f86\u9ad8\u6548\u5730\u5206\u6790\u548c\u8655\u7406\u6578\u64da\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u7e3d\u4e4b\uff0c\u968e\u6bb5\u662f MongoDB \u805a\u5408\u6846\u67b6\u4e2d\u7684\u4e00\u500b\u95dc\u9375\u6982\u5ff5\u3002\u5b83\u5141\u8a31\u7528\u6236\u5c0d\u6578\u64da\u9032\u884c\u64cd\u4f5c\uff0c\u4e26\u5c07\u7d50\u679c\u50b3\u905e\u7d66\u4e0b\u4e00\u500b\u968e\u6bb5\u3002\u805a\u5408\u6846\u67b6\u70ba MongoDB \u4e2d\u7684\u6578\u64da\u8655\u7406\u548c\u5206\u6790\u63d0\u4f9b\u4e86\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\u3002\u8981\u4e86\u89e3\u66f4\u591a\u95dc\u65bc MongoDB \u53ca\u5176\u529f\u80fd\uff0c\u8acb\u8a2a\u554f Server.HK<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
MongoDB \u8a5e\u5f59\u8868 &#82...<\/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-21588","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21588","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=21588"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21588\/revisions"}],"predecessor-version":[{"id":23853,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21588\/revisions\/23853"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}