MongoDB \u662f\u4e00\u500b\u53d7\u6b61\u8fce\u7684\u958b\u6e90 NoSQL \u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u9ad8\u6548\u80fd\u3001\u53ef\u64f4\u5c55\u6027\u548c\u9748\u6d3b\u6027\u3002\u7136\u800c\uff0c\u8207\u5176\u4ed6\u8edf\u4ef6\u4e00\u6a23\uff0c\u5b83\u53ef\u80fd\u6703\u9047\u5230\u9700\u8981\u89e3\u6c7a\u7684\u932f\u8aa4\u3002\u5176\u4e2d\u4e00\u500b\u932f\u8aa4\u662f MongoDB \u932f\u8aa4\u4ee3\u78bc – 29 – NonExistentPath\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u6b64\u932f\u8aa4\u7684\u542b\u7fa9\u53ca\u5176\u4fee\u5fa9\u65b9\u6cd5\u3002<\/p>\n
\u7576\u4f60\u9047\u5230 MongoDB \u932f\u8aa4\u4ee3\u78bc – 29 – NonExistentPath \u6642\uff0c\u9019\u610f\u5473\u8457\u5728\u547d\u4ee4\u6216\u67e5\u8a62\u4e2d\u6307\u5b9a\u7684\u8def\u5f91\u4e0d\u5b58\u5728\u3002\u6b64\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u4f60\u5617\u8a66\u8a2a\u554f\u6587\u6a94\u4e2d\u4e0d\u5b58\u5728\u7684\u5b57\u6bb5\u6216\u5143\u7d20\u6642\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5047\u8a2d\u4f60\u6709\u4e00\u500b\u540d\u70ba “users” \u7684\u96c6\u5408\uff0c\u5176\u6587\u6a94\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n
{\r\n \"_id\": ObjectId(\"5f7e8d9a0a3e4b2c6d8e9f0a\"),\r\n \"name\": \"John Doe\",\r\n \"email\": \"john.doe@example.com\"\r\n}\r\n<\/code><\/pre>\n\u5982\u679c\u4f60\u5617\u8a66\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u8a2a\u554f\u4e00\u500b\u4e0d\u5b58\u5728\u7684\u5b57\u6bb5 “age”\uff1a<\/p>\n
db.users.find({ \"age\": 30 })\r\n<\/code><\/pre>\n\u4f60\u5c07\u6703\u9047\u5230 MongoDB \u932f\u8aa4\u4ee3\u78bc – 29 – NonExistentPath\u3002<\/p>\n
\u4fee\u5fa9 MongoDB \u932f\u8aa4\u4ee3\u78bc – 29 – NonExistentPath<\/h2>\n
\u8981\u4fee\u5fa9 MongoDB \u932f\u8aa4\u4ee3\u78bc – 29 – NonExistentPath\uff0c\u4f60\u9700\u8981\u78ba\u4fdd\u4f60\u5617\u8a66\u8a2a\u554f\u7684\u8def\u5f91\u78ba\u5be6\u5b58\u5728\u65bc\u6587\u6a94\u4e2d\u3002\u4ee5\u4e0b\u662f\u5e7e\u500b\u89e3\u6c7a\u6b65\u9a5f\uff1a<\/p>\n
1. \u6aa2\u67e5\u6587\u6a94\u7d50\u69cb<\/h3>\n
\u9996\u5148\uff0c\u9a57\u8b49\u4f60\u6b63\u5728\u64cd\u4f5c\u7684\u6587\u6a94\u7d50\u69cb\u3002\u78ba\u4fdd\u4f60\u5617\u8a66\u8a2a\u554f\u7684\u5b57\u6bb5\u6216\u5143\u7d20\u5b58\u5728\u65bc\u6587\u6a94\u4e2d\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 db.collection.findOne()<\/code> \u547d\u4ee4\u4f86\u6aa2\u7d22\u4e00\u500b\u6587\u6a94\u4e26\u6aa2\u67e5\u5176\u7d50\u69cb\u3002<\/p>\n2. \u4f7f\u7528\u9ede\u8868\u793a\u6cd5<\/h3>\n
\u5728\u8a2a\u554f\u6587\u6a94\u4e2d\u7684\u5d4c\u5957\u5b57\u6bb5\u6216\u5143\u7d20\u6642\uff0c\u8acb\u4f7f\u7528\u9ede\u8868\u793a\u6cd5\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6709\u4e00\u500b\u5305\u542b\u5d4c\u5957\u5b57\u6bb5 “address” \u7684\u6587\u6a94\uff0c\u4e14\u4f60\u60f3\u8a2a\u554f\u5176\u4e2d\u7684 “city” \u5b57\u6bb5\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n
db.collection.find({ \"address.city\": \"New York\" })\r\n<\/code><\/pre>\n\u4f7f\u7528\u9ede\u8868\u793a\u6cd5\u53ef\u4ee5\u78ba\u4fdd\u4f60\u6b63\u5728\u8a2a\u554f\u6587\u6a94\u4e2d\u7684\u6709\u6548\u8def\u5f91\u3002<\/p>\n
3. \u8655\u7406\u7f3a\u5931\u5b57\u6bb5<\/h3>\n
\u5982\u679c\u4f60\u9810\u671f\u67d0\u4e9b\u6587\u6a94\u4e2d\u7f3a\u5c11\u7279\u5b9a\u5b57\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528 $exists<\/code> \u904b\u7b97\u7b26\u4f86\u512a\u96c5\u5730\u8655\u7406\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u60f3\u67e5\u627e\u6240\u6709\u5b58\u5728 “age” \u5b57\u6bb5\u7684\u6587\u6a94\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\ndb.collection.find({ \"age\": { \"$exists\": true } })\r\n<\/code><\/pre>\n\u6b64\u67e5\u8a62\u5c07\u50c5\u8fd4\u56de\u90a3\u4e9b\u5b58\u5728 “age” \u5b57\u6bb5\u7684\u6587\u6a94\u3002<\/p>\n
4. \u66f4\u65b0\u6587\u6a94<\/h3>\n
\u5982\u679c\u4f60\u9700\u8981\u66f4\u65b0\u6587\u6a94\u4ee5\u4fee\u5fa9 NonExistentPath \u932f\u8aa4\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 $set<\/code> \u904b\u7b97\u7b26\u4f86\u6dfb\u52a0\u6216\u4fee\u6539\u5b57\u6bb5\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u60f3\u70ba\u6240\u6709\u6c92\u6709 “age” \u5b57\u6bb5\u7684\u6587\u6a94\u6dfb\u52a0\u8a72\u5b57\u6bb5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u66f4\u65b0\u547d\u4ee4\uff1a<\/p>\ndb.collection.updateMany({ \"age\": { \"$exists\": false } }, { \"$set\": { \"age\": 30 } })\r\n<\/code><\/pre>\n\u6b64\u547d\u4ee4\u5c07\u70ba\u6240\u6709\u7f3a\u5c11 “age” \u5b57\u6bb5\u7684\u6587\u6a94\u6dfb\u52a0 “age” \u5b57\u6bb5\uff0c\u4e26\u8a2d\u7f6e\u5176\u503c\u70ba 30\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
MongoDB \u932f\u8aa4\u4ee3\u78bc – 29 – NonExistentPath \u767c\u751f\u5728\u4f60\u5617\u8a66\u8a2a\u554f\u6587\u6a94\u4e2d\u4e0d\u5b58\u5728\u7684\u8def\u5f91\u6642\u3002\u8981\u4fee\u5fa9\u6b64\u932f\u8aa4\uff0c\u9700\u6aa2\u67e5\u6587\u6a94\u7d50\u69cb\uff0c\u4f7f\u7528\u9ede\u8868\u793a\u6cd5\u4f86\u8a2a\u554f\u5d4c\u5957\u5b57\u6bb5\uff0c\u901a\u904e $exists<\/code> \u904b\u7b97\u7b26\u8655\u7406\u7f3a\u5931\u5b57\u6bb5\uff0c\u4e26\u5728\u5fc5\u8981\u6642\u66f4\u65b0\u6587\u6a94\u3002\u5982\u679c\u4f60\u9700\u8981\u70ba MongoDB \u61c9\u7528\u7a0b\u5f0f\u63d0\u4f9b\u53ef\u9760\u4e14\u9ad8\u6548\u80fd\u7684 VPS \u8a17\u7ba1\uff0c\u8acb\u8003\u616e Server.HK<\/a>\u3002\u4ed6\u5011\u7684\u512a\u8cea VPS \u89e3\u6c7a\u65b9\u6848\u53ef\u78ba\u4fdd\u4f60\u7684 MongoDB \u6578\u64da\u5eab\u9806\u5229\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5982\u4f55\u4fee\u5fa9 MongoDB \u932f\u8aa4\u4ee3...<\/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-21624","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21624","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=21624"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21624\/revisions"}],"predecessor-version":[{"id":23803,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21624\/revisions\/23803"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21624"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21624"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21624"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}