{"id":247334,"date":"2024-01-02T20:36:18","date_gmt":"2024-01-02T12:36:18","guid":{"rendered":"https:\/\/www.idc.net\/help\/247334\/"},"modified":"2024-01-02T20:36:18","modified_gmt":"2024-01-02T12:36:18","slug":"mongodb-%e6%9c%af%e8%af%ad-%e6%8a%95%e5%bd%b1","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/247334\/","title":{"rendered":"MongoDB \u672f\u8bed &#8211; \u6295\u5f71"},"content":{"rendered":"<p><title id=\"mongodb-%e6%9c%af%e8%af%ad-%e6%8a%95%e5%bd%b1-ucBvPhKtsv\">MongoDB \u672f\u8bed - \u6295\u5f71<\/title><\/p>\n<h1 id=\"mongodb-%e6%9c%af%e8%af%ad-%e6%8a%95%e5%bd%b1-ucBvPhKtsv\">MongoDB \u672f\u8bed - \u6295\u5f71<\/h1>\n<p>\u5728MongoDB\u4e2d\uff0c\u6295\u5f71\u662f\u6307\u5728\u67e5\u8be2\u4e2d\u9009\u62e9\u8981\u8fd4\u56de\u7684\u5b57\u6bb5\u3002\u901a\u8fc7\u4f7f\u7528\u6295\u5f71\uff0c\u60a8\u53ef\u4ee5\u6307\u5b9a\u53ea\u8fd4\u56de\u6587\u6863\u4e2d\u7684\u7279\u5b9a\u5b57\u6bb5\uff0c\u800c\u4e0d\u662f\u8fd4\u56de\u6574\u4e2a\u6587\u6863\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e6%8a%95%e5%bd%b1-ucBvPhKtsv\">\u4f7f\u7528\u6295\u5f71<\/h2>\n<p>\u8981\u4f7f\u7528\u6295\u5f71\uff0c\u60a8\u9700\u8981\u5728\u67e5\u8be2\u64cd\u4f5c\u4e2d\u4f7f\u7528\u6295\u5f71\u64cd\u4f5c\u7b26\u3002\u6295\u5f71\u64cd\u4f5c\u7b26\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5176\u4e2d\u952e\u8868\u793a\u8981\u8fd4\u56de\u7684\u5b57\u6bb5\uff0c\u503c\u8868\u793a\u662f\u5426\u8fd4\u56de\u8be5\u5b57\u6bb5\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u67e5\u8be2\uff0c\u4f7f\u7528\u6295\u5f71\u64cd\u4f5c\u7b26\u6765\u9009\u62e9\u53ea\u8fd4\u56de\"name\"\u548c\"age\"\u5b57\u6bb5\uff1a<\/p>\n<pre>\ndb.collection.find({}, { name: 1, age: 1 })\n<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u67e5\u8be2\u6761\u4ef6\uff0c\u6211\u4eec\u4f7f\u7528\u7a7a\u5bf9\u8c61{}\u8868\u793a\u8fd4\u56de\u6240\u6709\u6587\u6863\u3002\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u6295\u5f71\u64cd\u4f5c\u7b26\uff0c\u6211\u4eec\u4f7f\u7528{ name: 1, age: 1 }\u8868\u793a\u53ea\u8fd4\u56de\"name\"\u548c\"age\"\u5b57\u6bb5\u3002<\/p>\n<h2 id=\"%e6%8e%92%e9%99%a4%e7%89%b9%e5%ae%9a%e5%ad%97%e6%ae%b5-ucBvPhKtsv\">\u6392\u9664\u7279\u5b9a\u5b57\u6bb5<\/h2>\n<p>\u9664\u4e86\u9009\u62e9\u8981\u8fd4\u56de\u7684\u5b57\u6bb5\u5916\uff0c\u60a8\u8fd8\u53ef\u4ee5\u9009\u62e9\u6392\u9664\u4e0d\u9700\u8981\u7684\u5b57\u6bb5\u3002\u8981\u6392\u9664\u5b57\u6bb5\uff0c\u60a8\u53ef\u4ee5\u5c06\u5b57\u6bb5\u7684\u503c\u8bbe\u7f6e\u4e3a0\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u67e5\u8be2\uff0c\u4f7f\u7528\u6295\u5f71\u64cd\u4f5c\u7b26\u6765\u9009\u62e9\u8fd4\u56de\u9664\u4e86\"_id\"\u5b57\u6bb5\u4e4b\u5916\u7684\u6240\u6709\u5b57\u6bb5\uff1a<\/p>\n<pre>\ndb.collection.find({}, { _id: 0 })\n<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528{ _id: 0 }\u8868\u793a\u6392\u9664\"_id\"\u5b57\u6bb5\u3002<\/p>\n<h2 id=\"%e5%b5%8c%e5%a5%97%e5%ad%97%e6%ae%b5%e7%9a%84%e6%8a%95%e5%bd%b1-ucBvPhKtsv\">\u5d4c\u5957\u5b57\u6bb5\u7684\u6295\u5f71<\/h2>\n<p>\u5982\u679c\u60a8\u7684\u6587\u6863\u5305\u542b\u5d4c\u5957\u5b57\u6bb5\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u70b9\u7b26\u53f7\u6765\u6307\u5b9a\u5d4c\u5957\u5b57\u6bb5\u7684\u6295\u5f71\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u67e5\u8be2\uff0c\u4f7f\u7528\u6295\u5f71\u64cd\u4f5c\u7b26\u6765\u9009\u62e9\u8fd4\u56de\u5d4c\u5957\u5b57\u6bb5\"address.city\"\uff1a<\/p>\n<pre>\ndb.collection.find({}, { \"address.city\": 1 })\n<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528{ \"address.city\": 1 }\u8868\u793a\u8fd4\u56de\u5d4c\u5957\u5b57\u6bb5\"address.city\"\u3002<\/p>\n<h2 id=\"%e6%80%bb%e7%bb%93-ucBvPhKtsv\">\u603b\u7ed3<\/h2>\n<p>\u901a\u8fc7\u4f7f\u7528MongoDB\u7684\u6295\u5f71\u529f\u80fd\uff0c\u60a8\u53ef\u4ee5\u9009\u62e9\u6027\u5730\u8fd4\u56de\u6587\u6863\u4e2d\u7684\u7279\u5b9a\u5b57\u6bb5\uff0c\u800c\u4e0d\u662f\u8fd4\u56de\u6574\u4e2a\u6587\u6863\u3002\u8fd9\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u5e76\u51cf\u5c11\u7f51\u7edc\u4f20\u8f93\u7684\u6570\u636e\u91cf\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5bfb\u627e\u4e00\u4e2a\u53ef\u9760\u7684MongoDB\u6258\u7ba1\u89e3\u51b3\u65b9\u6848\uff0c\u540e\u6d6a\u4e91\u63d0\u4f9b\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u548c\u4e91\u670d\u52a1\u5668\u3002\u6211\u4eec\u7684\u9999\u6e2f\u670d\u52a1\u5668\u662f\u9996\u9009\u4e4b\u4e00\uff0c\u6211\u4eec\u8fd8\u63d0\u4f9b10\u5143\u9999\u6e2f\u670d\u52a1\u5668\u548c\u9999\u6e2f\u670d\u52a1\u5668\u514d\u8d39\u8bd5\u7528\u3002\u8bf7\u8bbf\u95ee\u6211\u4eec\u7684\u5b98\u7f51\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\uff1a<a href=\"https:\/\/idc.net\">https:\/\/idc.net<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MongoDB \u672f\u8bed - \u6295\u5f71 MongoDB \u672f\u8bed - \u6295\u5f71 \u5728MongoDB\u4e2d\uff0c\u6295\u5f71\u662f\u6307\u5728\u67e5\u8be2\u4e2d\u9009\u62e9\u8981\u8fd4\u56de [&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-247334","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/247334","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=247334"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/247334\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=247334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=247334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=247334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}