{"id":63734,"date":"2024-10-14T02:02:15","date_gmt":"2024-10-13T18:02:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/63734\/"},"modified":"2024-10-14T02:02:15","modified_gmt":"2024-10-13T18:02:15","slug":"mongodb%e8%a1%93%e8%aa%9e-%e9%81%8e%e6%bf%be%e5%99%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/63734\/","title":{"rendered":"MongoDB\u8853\u8a9e – \u904e\u6ffe\u5668"},"content":{"rendered":"

MongoDB\u8853\u8a9e – \u904e\u6ffe\u5668<\/h1>\n

\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cMongoDB\u4f5c\u70ba\u4e00\u7a2e\u6d41\u884c\u7684NoSQL\u6578\u64da\u5eab\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u5176\u9748\u6d3b\u7684\u6578\u64da\u6a21\u578b\u548c\u5f37\u5927\u7684\u67e5\u8a62\u80fd\u529b\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u9ad8\u6548\u5730\u8655\u7406\u548c\u5206\u6790\u6578\u64da\u3002\u5728MongoDB\u4e2d\uff0c\u904e\u6ffe\u5668\u662f\u67e5\u8a62\u64cd\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMongoDB\u4e2d\u7684\u904e\u6ffe\u5668\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u904e\u6ffe\u5668\uff1f<\/h2>\n

\u904e\u6ffe\u5668\u662f\u7528\u65bc\u67e5\u8a62\u6578\u64da\u7684\u689d\u4ef6\uff0c\u5e6b\u52a9\u7528\u6236\u5f9e\u6578\u64da\u96c6\u4e2d\u7be9\u9078\u51fa\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\u3002MongoDB\u4f7f\u7528BSON\u683c\u5f0f\u4f86\u8868\u793a\u6578\u64da\uff0c\u904e\u6ffe\u5668\u901a\u5e38\u4ee5JSON\u683c\u5f0f\u4f86\u7de8\u5beb\u3002\u9019\u4f7f\u5f97\u67e5\u8a62\u8a9e\u53e5\u65e2\u76f4\u89c0\u53c8\u6613\u65bc\u7406\u89e3\u3002<\/p>\n

\u904e\u6ffe\u5668\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n

\u5728MongoDB\u4e2d\uff0c\u904e\u6ffe\u5668\u901a\u5e38\u8207\u67e5\u8a62\u64cd\u4f5c\u4e00\u8d77\u4f7f\u7528\uff0c\u4f8b\u5982\u5728find()\u65b9\u6cd5\u4e2d\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n

db.collection.find({ filter })<\/code><\/pre>\n
\u5176\u4e2d\uff0ccollection<\/code>\u662f\u8981\u67e5\u8a62\u7684\u96c6\u5408\uff0cfilter<\/code>\u662f\u904e\u6ffe\u5668\u689d\u4ef6\u3002<\/p>\n
\u904e\u6ffe\u5668\u7684\u4f7f\u7528\u793a\u4f8b<\/h2>\n
\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u904e\u6ffe\u5668\u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n
1. \u7cbe\u78ba\u5339\u914d<\/h3>\n
\u5982\u679c\u6211\u5011\u60f3\u67e5\u8a62\u540d\u70ba\u201cJohn\u201d\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u904e\u6ffe\u5668\uff1a<\/p>\n
db.users.find({ name: \"John\" })<\/code><\/pre>\n
2. \u5927\u65bc\u6216\u5c0f\u65bc<\/h3>\n
\u5982\u679c\u6211\u5011\u60f3\u67e5\u8a62\u5e74\u9f61\u5927\u65bc25\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u904e\u6ffe\u5668\uff1a<\/p>\n
db.users.find({ age: { $gt: 25 } })<\/code><\/pre>\n
3. \u908f\u8f2f\u904b\u7b97\u7b26<\/h3>\n
MongoDB\u652f\u6301\u591a\u7a2e\u908f\u8f2f\u904b\u7b97\u7b26\uff0c\u4f8b\u5982$and\u3001$or\u548c$not\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528$or\u904b\u7b97\u7b26\u7684\u793a\u4f8b\uff1a<\/p>\n
db.users.find({ $or: [ { age: { $lt: 20 } }, { age: { $gt: 60 } } ] })<\/code><\/pre>\n
4. \u6b63\u5247\u8868\u9054\u5f0f<\/h3>\n
\u5982\u679c\u6211\u5011\u60f3\u67e5\u8a62\u540d\u5b57\u4ee5\u201cJ\u201d\u958b\u982d\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\u6b63\u5247\u8868\u9054\u5f0f\uff1a<\/p>\n
db.users.find({ name: { $regex: \/^J\/ } })<\/code><\/pre>\n
\u904e\u6ffe\u5668\u7684\u6027\u80fd\u8003\u91cf<\/h2>\n
\u5728\u4f7f\u7528\u904e\u6ffe\u5668\u6642\uff0c\u6027\u80fd\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\u56e0\u7d20\u3002\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u5efa\u8b70\u5c0d\u7d93\u5e38\u67e5\u8a62\u7684\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\u3002\u9019\u6a23\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6642\u9593\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u904e\u6ffe\u5668\u5728MongoDB\u4e2d\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u9ad8\u6548\u5730\u67e5\u8a62\u548c\u7be9\u9078\u6578\u64da\u3002\u901a\u904e\u9748\u6d3b\u904b\u7528\u5404\u7a2e\u904e\u6ffe\u5668\u689d\u4ef6\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u7cbe\u78ba\u5730\u7372\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u5408\u7406\u4f7f\u7528\u904e\u6ffe\u5668\u548c\u7d22\u5f15\u5c07\u6210\u70ba\u63d0\u5347\u61c9\u7528\u6027\u80fd\u7684\u95dc\u9375\u3002<\/p>\n
\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dcVPS\u548c\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 \u9999\u6e2fVPS<\/a> \u63d0\u4f9b\u7684\u8cc7\u6e90\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3MongoDB\u4e2d\u7684\u904e\u6ffe\u5668\u8853\u8a9e\uff0c\u638c\u63e1\u5982\u4f55\u6709\u6548\u67e5\u8a62\u548c\u7be9\u9078\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-63734","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/63734","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=63734"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/63734\/revisions"}],"predecessor-version":[{"id":63735,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/63734\/revisions\/63735"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=63734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=63734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=63734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}