{"id":32508,"date":"2023-05-12T03:04:53","date_gmt":"2023-03-04T06:05:35","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8node-js-express-mongodb%e4%bb%8e%e5%a4%9a%e4%b8%aa%e9%9b%86%e5%90%88%e4%b8%ad%e8%8e%b7%e5%8f%96%e6%95%b0%e6%8d%ae-lookup-%e3%80%82\/"},"modified":"2024-04-30T03:44:03","modified_gmt":"2024-04-29T19:44:03","slug":"%e4%bd%bf%e7%94%a8node-js-express-mongodb%e4%bb%8e%e5%a4%9a%e4%b8%aa%e9%9b%86%e5%90%88%e4%b8%ad%e8%8e%b7%e5%8f%96%e6%95%b0%e6%8d%ae-lookup-%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8node-js-express-mongodb%e4%bb%8e%e5%a4%9a%e4%b8%aa%e9%9b%86%e5%90%88%e4%b8%ad%e8%8e%b7%e5%8f%96%e6%95%b0%e6%8d%ae-lookup-%e3%80%82\/","title":{"rendered":"\u4f7f\u7528Node.js + Express + MongoDB\u4ece\u591a\u4e2a\u96c6\u5408\u4e2d\u83b7\u53d6\u6570\u636e -lookup-"},"content":{"rendered":"

\u9996\u5148, \u6216\u8005 \u5148\u8bf4\u4e00\u4e0b<\/h1>\n

\u6211\u5011\u5e0c\u671b\u5f9eworks\u4e2d\u63d0\u53d6\u6578\u64da\uff0c\u4e26\u6839\u64dauser_id\u9084\u63d0\u53d6\u76f8\u61c9\u7684users\u6578\u64da\u3002\u4f46\u662f\uff0c\u7576\u6211\u5011\u4e00\u6b21\u63d0\u53d6\u591a\u500b\u6578\u64da\u4e26\u9032\u884c\u5408\u4f75\u6642\uff0c\u4f7f\u7528MongoDB\u76f8\u5c0d\u65bcMySQL\u4f86\u8aaa\u4f3c\u4e4e\u66f4\u96e3\u8655\u7406\u3002\u7d93\u904e\u4e00\u756a\u7814\u7a76\u5f8c\uff0c\u6211\u5011\u767c\u73feMongoDB\u4e5f\u6709\u985e\u4f3cMySQL\u4e2d\u7684\u5de6\u9023\u63a5\uff08left join\uff09\u7684\u7528\u6cd5\u3002<\/p>\n

\u6570\u636e<\/h1>\n
{\r\n  \"user_name\": \"king\",\r\n  \"age\": 20,\r\n  \"id\": \"admin\",\r\n  \"pw\": \"1234\",\r\n  \"role\": \"admin\",\r\n  \"department\": \"A\"\r\n}\r\n<\/span><\/code><\/pre>\n
{\r\n  \"title\": \"to be hero\",\r\n  \"due_date\": \"2022-12-15\",\r\n  \"create_datetime\": \"2022-12-03 19:59:39\",\r\n  \"user_id\": \"admin\"\r\n}\r\n<\/span><\/code><\/pre>\n
\u9996\u5148\u5c1d\u8bd5\u5728lookup\u4e2d\u63d0\u53d6\u3002<\/h1>\n
db<\/span>.<\/span>collection<\/span>(<\/span>\"<\/span>works<\/span>\"<\/span>).<\/span>aggregate<\/span>([<\/span>\r\n    {<\/span>\r\n        $lookup<\/span>:<\/span> {<\/span>\r\n            from<\/span>:<\/span> \"<\/span>users<\/span>\"<\/span>,<\/span>\r\n            localField<\/span>:<\/span> \"<\/span>user_id<\/span>\"<\/span>,<\/span>\r\n            foreignField<\/span>:<\/span> \"<\/span>id<\/span>\"<\/span>,<\/span>\r\n            as<\/span>:<\/span> \"<\/span>unserInfo<\/span>\"<\/span>\r\n        },<\/span>\r\n    },<\/span>\r\n]).<\/span>toArray<\/span>((<\/span>err<\/span>,<\/span> result<\/span>)<\/span> =><\/span> {<\/span>\r\n    console<\/span>.<\/span>log<\/span>(<\/span>result<\/span>)<\/span>\r\n    res<\/span>.<\/span>render<\/span>(<\/span>'<\/span>.\/works\/works.ejs<\/span>'<\/span>,<\/span> {<\/span> works<\/span>:<\/span> result<\/span> })<\/span>\r\n})<\/span>\r\n<\/code><\/pre>\n
from: \u5bfe\u8c61\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3
\nlocalField: \u7d50\u5408\u306b\u4f7f\u7528\u3055\u308c\u308b\u57fa\u6e96\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\uff08\u3053\u3053\u3067\u306fworks\uff09
\nforeignField: \u7d50\u5408\u306b\u4f7f\u7528\u3055\u308c\u308b\u5bfe\u8c61\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\uff08\u3053\u3053\u3067\u306fusers\uff09
\nas: \u5bfe\u8c61\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u4fdd\u5b58\u540d<\/p>\n
[\r\n  {\r\n    _id: new ObjectId(\"638b2c1b6c66bbaeee6c0aa6\"),\r\n    title: 'to be hero',\r\n    due_date: '2022-12-15',\r\n    create_datetime: '2022-12-03 19:59:39',\r\n    user_id: 'admin',\r\n    unserInfo: [ \r\n     {\r\n      _id: new ObjectId(\"6388ca58dbdf448d85e9e159\"),\r\n      user_name: 'king',\r\n      age: 20,\r\n      id: 'admin',\r\n      pw: '1234',\r\n      role: 'admin',\r\n      department: 'A'\r\n    } \r\n    ]\r\n  }\r\n]\r\n\r\n<\/span><\/code><\/pre>\n
\u5728\u83b7\u53d6\u5de5\u4f5c\u6570\u636e\u7684\u540c\u65f6\uff0c\u8fd8\u4ee5\u7528\u6237\u4fe1\u606f\u7684\u5f62\u5f0f\u63d0\u53d6\u4e86userInfo\u3002\u7136\u800c\uff0cuserInfo\u4e2d\u5305\u542b\u4e86\u7528\u6237\u5bf9\u8c61\u6570\u636e\u7684\u5217\u8868\u7c7b\u578b\u3002
\n\u7531\u4e8e\u8fd9\u6837\u4e0d\u65b9\u4fbf\u4f7f\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e0b\u4e00\u4e2a$unwind\u64cd\u4f5c\uff0c\u5c06\u5bf9\u8c61\u4ece\u5217\u8868\u4e2d\u63d0\u53d6\u51fa\u6765\u3002<\/p>\n
\u4ece\u5217\u8868\u4e2d\u63d0\u53d6<\/h1>\n
db<\/span>.<\/span>collection<\/span>(<\/span>\"<\/span>works<\/span>\"<\/span>).<\/span>aggregate<\/span>([<\/span>\r\n    {<\/span>\r\n        $lookup<\/span>:<\/span> {<\/span>\r\n            from<\/span>:<\/span> \"<\/span>users<\/span>\"<\/span>,<\/span>\r\n            localField<\/span>:<\/span> \"<\/span>user_id<\/span>\"<\/span>,<\/span>\r\n            foreignField<\/span>:<\/span> \"<\/span>id<\/span>\"<\/span>,<\/span>\r\n            as<\/span>:<\/span> \"<\/span>unserInfo<\/span>\"<\/span>\r\n        },<\/span>\r\n    },<\/span>\r\n    \/\/\u8ffd\u52a0<\/span>\r\n    {<\/span> $unwind<\/span>:<\/span> \"<\/span>$unserInfo<\/span>\"<\/span> },<\/span>\r\n]).<\/span>toArray<\/span>((<\/span>err<\/span>,<\/span> result<\/span>)<\/span> =><\/span> {<\/span>\r\n    res<\/span>.<\/span>render<\/span>(<\/span>'<\/span>.\/works\/works.ejs<\/span>'<\/span>,<\/span> {<\/span> works<\/span>:<\/span> result<\/span> })<\/span>\r\n})<\/span>\r\n<\/code><\/pre>\n
[\r\n  {\r\n    _id: new ObjectId(\"638b2c1b6c66bbaeee6c0aa6\"),\r\n    title: 'to be hero',\r\n    due_date: '2022-12-15',\r\n    create_datetime: '2022-12-03 19:59:39',\r\n    user_id: 'admin',\r\n    unserInfo: {\r\n      _id: new ObjectId(\"6388ca58dbdf448d85e9e159\"),\r\n      user_name: 'king',\r\n      age: 20,\r\n      id: 'admin',\r\n      pw: '1234',\r\n      role: 'admin',\r\n      department: 'A'\r\n    }\r\n  }\r\n]\r\n<\/span><\/code><\/pre>\n
\u901a\u8fc7\u4f7f\u7528 $unwind\uff0c\u4ece\u5217\u8868\u4e2d\u63d0\u53d6\u51fa\u6765\u3002
\n\u5982\u679c\u8d2a\u5fc3\u4e00\u70b9\uff0c\u8fd8\u60f3\u4ece\u5bf9\u8c61\u4e2d\u63d0\u53d6\u51fa\u6765\u3002
\n\u4ece\u5bf9\u8c61\u4e2d\u63d0\u53d6\u51fa\u6765\u4f7f\u7528 $project\u3002<\/p>\n
\u5408\u5e76\u5fc5\u9700\u7684\u5b57\u6bb5<\/h1>\n
db<\/span>.<\/span>collection<\/span>(<\/span>\"<\/span>works<\/span>\"<\/span>).<\/span>aggregate<\/span>([<\/span>\r\n    {<\/span>\r\n        $lookup<\/span>:<\/span> {<\/span>\r\n            from<\/span>:<\/span> \"<\/span>users<\/span>\"<\/span>,<\/span>\r\n            localField<\/span>:<\/span> \"<\/span>user_id<\/span>\"<\/span>,<\/span>\r\n            foreignField<\/span>:<\/span> \"<\/span>id<\/span>\"<\/span>,<\/span>\r\n            as<\/span>:<\/span> \"<\/span>unserInfo<\/span>\"<\/span>\r\n        },<\/span>\r\n    },<\/span>\r\n    {<\/span> $unwind<\/span>:<\/span> \"<\/span>$unserInfo<\/span>\"<\/span> },<\/span>\r\n    {<\/span>\r\n        \/\/\u8ffd\u52a0<\/span>\r\n        $project<\/span>:<\/span> {<\/span>\r\n            _id<\/span>:<\/span> 1<\/span>,<\/span>\r\n            create_datetime<\/span>:<\/span> 1<\/span>,<\/span>\r\n            user_id<\/span>:<\/span> 1<\/span>,<\/span>\r\n            user_name<\/span>:<\/span> \"<\/span>$unserInfo.user_name<\/span>\"<\/span>,<\/span>\r\n            role<\/span>:<\/span> \"<\/span>$unserInfo.role<\/span>\"<\/span>,<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n]).<\/span>toArray<\/span>((<\/span>err<\/span>,<\/span> result<\/span>)<\/span> =><\/span> {<\/span>\r\n    res<\/span>.<\/span>render<\/span>(<\/span>'<\/span>.\/works\/works.ejs<\/span>'<\/span>,<\/span> {<\/span> works<\/span>:<\/span> result<\/span> })<\/span>\r\n})<\/span>\r\n<\/code><\/pre>\n
[\r\n  {\r\n    _id: new ObjectId(\"638b2c1b6c66bbaeee6c0aa6\"),\r\n    create_datetime: '2022-12-03 19:59:39',\r\n    user_id: 'admin',\r\n    user_name: 'king',\r\n    role: 'admin'\r\n  }\r\n]\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u539f\u59cb\u5b57\u6bb5\u7684\u57fa\u51c6\u503c\u4e3a1\u6765\u663e\u793a\u3002
\n\u5728\u5408\u5e76\u6570\u636e\u65f6\uff0c\u9700\u8981\u6307\u5b9a\u65b0\u65e7\u5b57\u6bb5\u3002
\n\u7136\u800c\uff0c\u4f3c\u4e4e\u8fd8\u6ca1\u6709\u4e00\u79cd\u65e0\u9700\u6307\u5b9a\u5373\u53ef\u5217\u51fa\u6240\u6709\u5b57\u6bb5\u7684\u65b9\u6cd5\u3002<\/p>\n
\u6700\u540e<\/h1>\n
\u5f88\u907a\u61be\uff0c\u76ee\u524d\u597d\u50cf\u9084\u6c92\u6709\u50cfMySQL\u90a3\u6a23\u5b8c\u7f8e\u7684left join\u3002
\n\u6211\u89ba\u5f97\u7121\u6cd5\u76f4\u63a5\u4f7f\u7528SQL\u8a9e\u53e5\u662fMongoDB\u7684\u7f3a\u9ede\u3002
\n\u4f46\u662f\u5982\u679c\u80fd\u5920\u50cf\u4f7f\u7528inner join\u90a3\u6a23\u7684\u65b9\u5f0f\uff0c\u6211\u89ba\u5f97\u958b\u767c\u901f\u5ea6\u6703\u52a0\u5feb\u3002<\/p>\n
\u76f8\u5173<\/h1>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
\u9996\u5148, \u6216\u8005 \u5148\u8bf4\u4e00\u4e0b \u6211\u5011\u5e0c\u671b\u5f9eworks\u4e2d\u63d0\u53d6\u6578\u64da\uff0c\u4e26\u6839\u64dauser_id\u9084\u63d0\u53d6\u76f8\u61c9\u7684users\u6578\u64da\u3002\u4f46\u662f\uff0c […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-32508","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u4f7f\u7528Node.js + Express + MongoDB\u4ece\u591a\u4e2a\u96c6\u5408\u4e2d\u83b7\u53d6\u6570\u636e -lookup- Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528node-js-express-mongodb\u4ece\u591a\u4e2a\u96c6\u5408\u4e2d\u83b7\u53d6\u6570\u636e-lookup-\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4f7f\u7528Node.js + Express + MongoDB\u4ece\u591a\u4e2a\u96c6\u5408\u4e2d\u83b7\u53d6\u6570\u636e -lookup-\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148, \u6216\u8005 \u5148\u8bf4\u4e00\u4e0b \u6211\u5011\u5e0c\u671b\u5f9eworks\u4e2d\u63d0\u53d6\u6578\u64da\uff0c\u4e26\u6839\u64dauser_id\u9084\u63d0\u53d6\u76f8\u61c9\u7684users\u6578\u64da\u3002\u4f46\u662f\uff0c […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528node-js-express-mongodb\u4ece\u591a\u4e2a\u96c6\u5408\u4e2d\u83b7\u53d6\u6570\u636e-lookup-\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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