{"id":21616,"date":"2024-01-02T12:27:27","date_gmt":"2024-01-02T12:27:27","guid":{"rendered":"https:\/\/server.hk\/blog\/21616\/"},"modified":"2024-11-14T10:29:44","modified_gmt":"2024-11-14T02:29:44","slug":"how-to-fix-mongodb-error-code-21-emptyarrayoperation","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/21616\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 MongoDB \u932f\u8aa4\u4ee3\u78bc – 21 – EmptyArrayOperation"},"content":{"rendered":"

\u5982\u4f55\u4fee\u5fa9 MongoDB \u932f\u8aa4\u4ee3\u78bc – 21 – EmptyArrayOperation<\/h1>\n

MongoDB \u662f\u4e00\u500b\u53d7\u6b61\u8fce\u7684 NoSQL \u6578\u64da\u5eab\uff0c\u63d0\u4f9b\u9ad8\u6548\u80fd\u3001\u53ef\u64f4\u5c55\u6027\u53ca\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 – 21 – EmptyArrayOperation\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u6b64\u932f\u8aa4\u7684\u6210\u56e0\uff0c\u4e26\u63d0\u4f9b\u9010\u6b65\u89e3\u6c7a\u65b9\u6848\u4f86\u4fee\u5fa9\u5b83\u3002<\/p>\n

\u4e86\u89e3 MongoDB \u932f\u8aa4\u4ee3\u78bc – 21 – EmptyArrayOperation<\/h2>\n

\u7576\u4f60\u9047\u5230 MongoDB \u932f\u8aa4\u4ee3\u78bc – 21 – EmptyArrayOperation \u6642\uff0c\u9019\u610f\u5473\u8457\u4f60\u6b63\u5617\u8a66\u5c0d\u4e00\u500b\u7a7a\u6578\u7d44\u9032\u884c\u64cd\u4f5c\u3002\u6b64\u932f\u8aa4\u901a\u5e38\u5728\u4f7f\u7528 $push<\/code> \u6216 $addToSet<\/code> \u64cd\u4f5c\u7b26\u5411\u4e0d\u5b58\u5728\u6216\u70ba\u7a7a\u7684\u6578\u7d44\u5b57\u6bb5\u6dfb\u52a0\u5143\u7d20\u6642\u767c\u751f\u3002<\/p>\n

\u4ee5\u4e0b\u662f\u53ef\u80fd\u89f8\u767c\u6b64\u932f\u8aa4\u7684 MongoDB \u67e5\u8a62\u7bc4\u4f8b\uff1a<\/p>\n

db.collection.update(\r\n   { _id: ObjectId(\"1234567890\") },\r\n   { $push: { arrayField: { $each: [1, 2, 3] } } }\r\n)\r\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5982\u679c arrayField<\/code> \u4e0d\u5b58\u5728\u6216\u70ba\u7a7a\uff0cMongoDB \u6703\u62cb\u51fa\u932f\u8aa4\u4ee3\u78bc – 21\u3002<\/p>\n
\u4fee\u5fa9 MongoDB \u932f\u8aa4\u4ee3\u78bc – 21 – EmptyArrayOperation<\/h2>\n
\u8981\u4fee\u5fa9 MongoDB \u932f\u8aa4\u4ee3\u78bc – 21 – EmptyArrayOperation\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u6b65\u9a5f\u9032\u884c\uff1a<\/p>\n
\u6b65\u9a5f 1\uff1a\u6aa2\u67e5\u6578\u7d44\u5b57\u6bb5\u662f\u5426\u5b58\u5728<\/h3>\n
\u5728\u5c0d\u6578\u7d44\u5b57\u6bb5\u57f7\u884c\u4efb\u4f55\u64cd\u4f5c\u4e4b\u524d\uff0c\u78ba\u8a8d\u8a72\u5b57\u6bb5\u662f\u5426\u5b58\u5728\u975e\u5e38\u91cd\u8981\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 $exists<\/code> \u64cd\u4f5c\u7b26\u4f86\u6aa2\u67e5\u8a72\u5b57\u6bb5\u662f\u5426\u5b58\u5728\u65bc\u6587\u6a94\u4e2d\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b\uff1a<\/p>\n
db.collection.find({ _id: ObjectId(\"1234567890\"), arrayField: { $exists: true } })\r\n<\/code><\/pre>\n
\u5982\u679c\u67e5\u8a62\u8fd4\u56de\u6587\u6a94\uff0c\u8868\u793a\u6578\u7d44\u5b57\u6bb5\u5b58\u5728\uff0c\u4f60\u53ef\u4ee5\u7e7c\u7e8c\u9032\u884c\u64cd\u4f5c\u3002\u5426\u5247\uff0c\u4f60\u9700\u8981\u8655\u7406\u6578\u7d44\u5b57\u6bb5\u4e1f\u5931\u6216\u70ba\u7a7a\u7684\u60c5\u6cc1\u3002<\/p>\n
\u6b65\u9a5f 2\uff1a\u8655\u7406\u4e1f\u5931\u6216\u70ba\u7a7a\u7684\u6578\u7d44\u5b57\u6bb5<\/h3>\n
\u5982\u679c\u6578\u7d44\u5b57\u6bb5\u4e1f\u5931\u6216\u70ba\u7a7a\uff0c\u4f60\u6709\u5e7e\u500b\u9078\u9805\u4f86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff1a<\/p>\n
\u5275\u5efa\u6578\u7d44\u5b57\u6bb5<\/h4>\n
\u5982\u679c\u6578\u7d44\u5b57\u6bb5\u4e1f\u5931\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 $set<\/code> \u64cd\u4f5c\u7b26\u4f86\u5275\u5efa\u5b83\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b\uff1a<\/p>\n
db.collection.update(\r\n   { _id: ObjectId(\"1234567890\") },\r\n   { $set: { arrayField: [] } }\r\n)\r\n<\/code><\/pre>\n
\u9019\u500b\u67e5\u8a62\u5c07\u5275\u5efa\u4e00\u500b\u7a7a\u6578\u7d44\u5b57\u6bb5\uff08\u5982\u679c\u5b83\u4e0d\u5b58\u5728\uff09\u3002<\/p>\n
\u4f7f\u7528 $addToSet \u4ee3\u66ff $push<\/h4>\n
\u5982\u679c\u6578\u7d44\u5b57\u6bb5\u5b58\u5728\u4f46\u70ba\u7a7a\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 $addToSet<\/code> \u64cd\u4f5c\u7b26\u4ee3\u66ff $push<\/code>\u3002$addToSet<\/code> \u64cd\u4f5c\u7b26\u53ea\u5728\u5143\u7d20\u4e0d\u5b58\u5728\u65bc\u6578\u7d44\u4e2d\u6642\u624d\u6dfb\u52a0\u5b83\u5011\u3002\u4ee5\u4e0b\u662f\u7bc4\u4f8b\uff1a<\/p>\n
db.collection.update(\r\n   { _id: ObjectId(\"1234567890\") },\r\n   { $addToSet: { arrayField: { $each: [1, 2, 3] } } }\r\n)\r\n<\/code><\/pre>\n
\u9019\u500b\u67e5\u8a62\u5c07\u53ea\u5728\u5143\u7d20\u4e0d\u5df2\u5b58\u5728\u65bc\u6578\u7d44\u4e2d\u6642\u6dfb\u52a0\u5b83\u5011\u3002<\/p>\n
\u6b65\u9a5f 3\uff1a\u91cd\u8a66\u64cd\u4f5c<\/h3>\n
\u8655\u7406\u5b8c\u4e1f\u5931\u6216\u70ba\u7a7a\u7684\u6578\u7d44\u5b57\u6bb5\u5f8c\uff0c\u4f60\u53ef\u4ee5\u91cd\u8a66\u5f15\u767c\u932f\u8aa4\u7684\u64cd\u4f5c\u3002\u5982\u679c\u6578\u7d44\u5b57\u6bb5\u5b58\u5728\u4e14\u4e0d\u70ba\u7a7a\uff0c\u8a72\u932f\u8aa4\u61c9\u4e0d\u518d\u767c\u751f\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u672c\u6587\u8a0e\u8ad6\u4e86 MongoDB \u932f\u8aa4\u4ee3\u78bc – 21 – EmptyArrayOperation\uff0c\u4e26\u63d0\u4f9b\u4e86\u9010\u6b65\u89e3\u6c7a\u65b9\u6848\u4f86\u4fee\u5fa9\u5b83\u3002\u8a18\u5f97\u5728\u5c0d\u6578\u7d44\u5b57\u6bb5\u9032\u884c\u4efb\u4f55\u64cd\u4f5c\u4e4b\u524d\u6aa2\u67e5\u5b83\u662f\u5426\u5b58\u5728\u3002\u5982\u679c\u6578\u7d44\u5b57\u6bb5\u4e1f\u5931\u6216\u70ba\u7a7a\uff0c\u4f60\u53ef\u4ee5\u5275\u5efa\u5b83\uff0c\u6216\u4f7f\u7528 $addToSet<\/code> \u64cd\u4f5c\u7b26\u4ee3\u66ff $push<\/code>\u3002\u901a\u904e\u9075\u5faa\u9019\u4e9b\u6b65\u9a5f\uff0c\u4f60\u53ef\u4ee5\u89e3\u6c7a EmptyArrayOperation \u932f\u8aa4\uff0c\u4e26\u7e7c\u7e8c\u7121\u7e2b\u5730\u4f7f\u7528 MongoDB\u3002<\/p>\n
\u6b32\u4e86\u89e3\u6709\u95dc VPS \u8a17\u7ba1\u65b9\u6848\u7684\u66f4\u591a\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f Server.HK<\/a>\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-21616","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21616","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=21616"}],"version-history":[{"count":2,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21616\/revisions"}],"predecessor-version":[{"id":23815,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21616\/revisions\/23815"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}