{"id":21688,"date":"2024-01-02T13:39:27","date_gmt":"2024-01-02T13:39:27","guid":{"rendered":"https:\/\/server.hk\/blog\/21688\/"},"modified":"2024-11-14T10:28:38","modified_gmt":"2024-11-14T02:28:38","slug":"how-to-fix-mongodb-error-code-97-noprojectionfound","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/21688\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 MongoDB \u932f\u8aa4\u4ee3\u78bc – 97 – NoProjectionFound"},"content":{"rendered":"

\u5982\u4f55\u4fee\u5fa9 MongoDB \u932f\u8aa4\u4ee3\u78bc – 97 – NoProjectionFound<\/h1>\n

MongoDB \u662f\u4e00\u6b3e\u5ee3\u53d7\u6b61\u8fce\u7684\u958b\u6e90 NoSQL \u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u9ad8\u6548\u80fd\u3001\u53ef\u64f4\u5c55\u6027\u53ca\u9748\u6d3b\u6027\u3002\u7136\u800c\uff0c\u8207\u4efb\u4f55\u8edf\u4ef6\u4e00\u6a23\uff0c\u5b83\u4e5f\u53ef\u80fd\u9047\u5230\u9700\u8981\u89e3\u6c7a\u7684\u932f\u8aa4\u3002\u5176\u4e2d\u4e00\u500b\u932f\u8aa4\u4fbf\u662f MongoDB \u932f\u8aa4\u4ee3\u78bc – 97 – NoProjectionFound\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u542b\u7fa9\u53ca\u5176\u89e3\u6c7a\u65b9\u6cd5\u3002<\/p>\n

\u7406\u89e3 MongoDB \u932f\u8aa4\u4ee3\u78bc – 97 – NoProjectionFound<\/h2>\n

\u7576\u4f7f\u7528 MongoDB \u6642\uff0c\u60a8\u53ef\u80fd\u6703\u9047\u5230 “NoProjectionFound” \u7684\u932f\u8aa4\u8a0a\u606f\uff0c\u9023\u540c\u932f\u8aa4\u4ee3\u78bc 97\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u60a8\u5c0d\u96c6\u5408\u9032\u884c\u67e5\u627e\u64cd\u4f5c\u4e26\u6307\u5b9a\u7684\u6295\u5f71\u8207\u6587\u4ef6\u4e2d\u7684\u4efb\u4f55\u5b57\u6bb5\u4e0d\u76f8\u7b26\u6642\u3002<\/p>\n

\u5728 MongoDB \u4e2d\uff0c\u6295\u5f71\u5141\u8a31\u60a8\u6307\u5b9a\u8981\u5728\u67e5\u8a62\u7d50\u679c\u4e2d\u5305\u542b\u6216\u6392\u9664\u54ea\u4e9b\u5b57\u6bb5\uff0c\u9019\u6709\u52a9\u65bc\u901a\u904e\u50c5\u6aa2\u7d22\u5fc5\u8981\u6578\u64da\u4f86\u512a\u5316\u6027\u80fd\u3002\u7136\u800c\uff0c\u5982\u679c\u60a8\u6307\u5b9a\u7684\u6295\u5f71\u5728\u6587\u4ef6\u4e2d\u4e0d\u5b58\u5728\uff0cMongoDB \u5c07\u6703\u62cb\u51fa NoProjectionFound \u932f\u8aa4\u3002<\/p>\n

\u4fee\u5fa9 MongoDB \u932f\u8aa4\u4ee3\u78bc – 97 – NoProjectionFound<\/h2>\n

\u8981\u4fee\u5fa9 NoProjectionFound \u932f\u8aa4\uff0c\u60a8\u9700\u8981\u78ba\u4fdd\u5728\u67e5\u8a62\u4e2d\u6307\u5b9a\u7684\u6295\u5f71\u8207\u6587\u4ef6\u4e2d\u5b58\u5728\u7684\u5b57\u6bb5\u76f8\u5339\u914d\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u9075\u5faa\u7684\u6b65\u9a5f\uff1a<\/p>\n

1. \u6aa2\u67e5\u5b57\u6bb5\u540d\u7a31<\/h3>\n

\u6aa2\u67e5\u60a8\u7684\u96c6\u5408\u4e2d\u7684\u5b57\u6bb5\u540d\u7a31\uff0c\u4e26\u78ba\u8a8d\u60a8\u5728\u67e5\u8a62\u4e2d\u6307\u5b9a\u7684\u6295\u5f71\u8207\u9019\u4e9b\u5b57\u6bb5\u540d\u7a31\u5b8c\u5168\u4e00\u81f4\u3002MongoDB \u662f\u5340\u5206\u5927\u5c0f\u5beb\u7684\uff0c\u56e0\u6b64\u8acb\u78ba\u4fdd\u6295\u5f71\u4e2d\u5b57\u6bb5\u540d\u7a31\u7684\u5927\u5c0f\u5beb\u8207\u6587\u4ef6\u4e2d\u7684\u4e00\u81f4\u3002<\/p>\n

2. \u4f7f\u7528 $project \u64cd\u4f5c\u7b26<\/h3>\n

\u5982\u679c\u60a8\u5e0c\u671b\u5728\u67e5\u8a62\u7d50\u679c\u4e2d\u5305\u542b\u6216\u6392\u9664\u7279\u5b9a\u5b57\u6bb5\uff0c\u53ef\u4ee5\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528 $project \u64cd\u4f5c\u7b26\u3002$project \u64cd\u4f5c\u7b26\u5141\u8a31\u60a8\u91cd\u65b0\u5851\u9020\u6587\u6a94\u4e26\u6307\u5b9a\u8981\u5305\u542b\u6216\u6392\u9664\u7684\u5b57\u6bb5\u3002<\/p>\n

\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n

\r\ndb.collection.aggregate([\r\n  {\r\n    $project: {\r\n      field1: 1, \/\/ \u5305\u542b field1\r\n      field2: 1, \/\/ \u5305\u542b field2\r\n      _id: 0 \/\/ \u6392\u9664 _id\r\n    }\r\n  }\r\n])\r\n<\/pre>\n
\u5728\u6b64\u793a\u4f8b\u4e2d\uff0c$project \u64cd\u4f5c\u7b26\u5305\u62ec field1 \u548c field2\uff0c\u540c\u6642\u6392\u9664\u4e86\u67e5\u8a62\u7d50\u679c\u4e2d\u7684 _id \u5b57\u6bb5\u3002<\/p>\n
3. \u522a\u9664\u6295\u5f71<\/h3>\n
\u5982\u679c\u60a8\u4e0d\u9700\u8981\u6307\u5b9a\u6295\u5f71\u4e26\u5e0c\u671b\u5f9e\u6587\u6a94\u4e2d\u6aa2\u7d22\u6240\u6709\u5b57\u6bb5\uff0c\u60a8\u53ef\u4ee5\u7c21\u55ae\u5730\u5f9e\u67e5\u8a62\u4e2d\u522a\u9664\u6295\u5f71\u3002MongoDB \u9810\u8a2d\u6703\u8fd4\u56de\u6240\u6709\u5b57\u6bb5\u3002<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n
\r\ndb.collection.find({})\r\n<\/pre>\n
\u6b64\u67e5\u8a62\u5c07\u8fd4\u56de\u6587\u6a94\u4e2d\u7684\u6240\u6709\u5b57\u6bb5\uff0c\u800c\u4e0d\u5305\u542b\u4efb\u4f55\u6295\u5f71\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u7576\u60a8\u5728\u67e5\u8a62\u4e2d\u6307\u5b9a\u7684\u6295\u5f71\u8207\u6587\u6a94\u4e2d\u7684\u4efb\u4f55\u5b57\u6bb5\u4e0d\u5339\u914d\u6642\uff0c\u6703\u767c\u751f MongoDB \u932f\u8aa4\u4ee3\u78bc – 97 – NoProjectionFound\u3002\u8981\u4fee\u5fa9\u6b64\u932f\u8aa4\uff0c\u8acb\u78ba\u4fdd\u60a8\u7684\u6295\u5f71\u4e2d\u7684\u5b57\u6bb5\u540d\u7a31\u8207\u96c6\u5408\u4e2d\u7684\u5b57\u6bb5\u540d\u7a31\u4e00\u81f4\u3002\u60a8\u9084\u53ef\u4ee5\u4f7f\u7528 $project \u64cd\u4f5c\u7b26\u4f86\u5305\u542b\u6216\u6392\u9664\u7279\u5b9a\u5b57\u6bb5\u3002\u5982\u679c\u60a8\u4e0d\u9700\u8981\u6295\u5f71\uff0c\u53ef\u4ee5\u5c07\u5176\u5f9e\u67e5\u8a62\u4e2d\u522a\u9664\u4ee5\u6aa2\u7d22\u6240\u6709\u5b57\u6bb5\u3002<\/p>\n
\u82e5\u5c0b\u627e\u53ef\u9760\u4e14\u9ad8\u6548\u80fd\u7684 VPS \u4e3b\u6a5f\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e Server.HK<\/a>\u3002\u4f7f\u7528 Server.HK\uff0c\u60a8\u5c07\u9ad4\u9a57\u5230\u6839\u64da\u60a8\u7684\u9700\u6c42\u91cf\u8eab\u5b9a\u5236\u7684\u9802\u7d1a VPS \u4e3b\u6a5f\u670d\u52d9\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-21688","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21688","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=21688"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21688\/revisions"}],"predecessor-version":[{"id":23716,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21688\/revisions\/23716"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21688"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21688"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21688"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}