{"id":207654,"date":"2025-07-08T11:55:10","date_gmt":"2025-07-08T03:55:10","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207654\/"},"modified":"2025-07-08T11:55:10","modified_gmt":"2025-07-08T03:55:10","slug":"golang%e5%92%8cmongodb%e6%9f%a5%e8%af%a2%e5%88%97%e4%b8%8d%e5%ad%98%e5%9c%a8%e6%88%96%e4%b8%ba%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207654\/","title":{"rendered":"Golang\u548cMongodb\u67e5\u8be2\u5217\u4e0d\u5b58\u5728\u6216\u4e3a\u7a7a"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> Golang\u548cMongodb\u67e5\u8be2\u5217\u4e0d\u5b58\u5728\u6216\u4e3a\u7a7a<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-24 12:09:36<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

Golang<\/span>\u4e0d\u77e5\u9053\u5927\u5bb6\u662f\u5426\u719f\u6089\uff1f\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u300aGolang\u548cMongodb\u67e5\u8be2\u5217\u4e0d\u5b58\u5728\u6216\u4e3a\u7a7a\u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u5728\u770b\u5b8c\u672c\u7bc7\u6587\u7ae0\u540e\uff0c\u6709\u66f4\u597d\u7684\u5efa\u8bae\u6216\u8005\u53d1\u73b0\u54ea\u91cc\u6709\u95ee\u9898\uff0c\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u79ef\u6781\u8bc4\u8bba\u6307\u51fa\uff0c\u8c22\u8c22\uff01\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u52a0\u6cb9\u8fdb\u6b65\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u5982\u679c\u67d0\u4e2a\u5217\u4e0d\u5b58\u5728\u6216\u8005\u5217\u503c\u4e3a\u7a7a\uff0c\u6211\u5c1d\u8bd5\u67e5\u8be2 mongodb \u6587\u6863\uff08\u6765\u81ea go\uff09\uff0c\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u901a\u8fc7\u67e5\u8be2\u6211\u53ea\u8fd4\u56de\u8be5\u5217\u4e0d\u5b58\u5728\u7684\u884c\uff0c\u5e76\u5ffd\u7565\u5176\u4e2d\u7684\u884c\u8be5\u503c\u4e3a\u7a7a\u3002\u8fd9\u662f\u6211\u7684\u8fc7\u6ee4\u5668\uff1a<\/p>\n<\/p>\n

bson.D{{\"$or\", []interface{}{\n        bson.D{{\"date\", bson.M{\"$eq\": bsontype.Null}}},\n        bson.D{{\"date\", bson.M{\"$exists\": false}}},\n    },<\/pre>\n
\u6b64\u67e5\u8be2\u4e0d\u4f1a\u7ed9\u51fa\u4efb\u4f55\u9519\u8bef\uff0c\u5b83\u53ea\u8fd4\u56de\u65e5\u671f\u5217\u4e0d\u5b58\u5728\u7684\u884c\uff0c\u5ffd\u7565\u65e5\u671f\u5217\u5b58\u5728\u4e14\u503c\u4e3a null \u7684\u884c\u3002 \u6709\u8c01\u77e5\u9053\u5982\u4f55\u5728 go \u4e2d\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff1f \u611f\u8c22\u6240\u6709\u56de\u5e94\u3002 \u8c22\u8c22…<\/p>\n
 <\/p>\n
\u6b63\u786e\u7b54\u6848<\/h2>\n
 <\/p>\n
\u4e0b\u9762\u662f\u4e00\u4e9b\u4ee3\u7801\uff0c\u7528\u4e8e\u6d4b\u8bd5 mongodb \u96c6\u5408\u6587\u6863\u4e2d\u5b57\u6bb5\u7684\u4e0d\u5b58\u5728<\/em>\u6216\u7a7a<\/em>\u503c\u3002<\/p>\n
\u8003\u8651\u4e00\u4e2a\u5305\u542b\u4e09\u4e2a\u6587\u6863\u7684\u96c6\u5408\uff1a<\/p>\n
{ \"_id\": 1, \"a\": \"str-1\", \"b\" : 12 }\n{ \"_id\": 2, \"b\" : 99 }\n{ \"_id\": 3, \"a\" : null, \"b\" : 25 }<\/pre>\n
\u76ee\u6807\u662f\u67e5\u627e\u5177\u6709 _id<\/code> \u503c 2<\/code> \u548c 3<\/code> \u7684\u6587\u6863\u3002\u4ee5\u4e0b\u67e5\u8be2\u6267\u884c\u6b64\u64cd\u4f5c\uff1a<\/p>\n
cursor, err := collection.find(context.todo(), bson.d{{ \"a\", nil }})<\/pre>\n
\u8fd8\u6709\u53e6\u4e00\u79cd\u65b9\u6cd5\u53ef\u4ee5\u6267\u884c\u76f8\u540c\u7684\u67e5\u8be2\uff0c\u5373\u540c\u65f6\u4f7f\u7528 $exists<\/code> \u548c $type<\/code> \u8fd0\u7b97\u7b26\uff1a<\/p>\n
cur, err := collection.find(context.todo(), bson.d{{ \"$or\", bson.a{ bson.d{{\"a\", bson.d{{\"$exists\",false}}}}, bson.d{{\"a\", bson.d{{\"$type\",\"null\"}}}}}}})<\/pre>\n
\u4ee5\u4e0a\u4e24\u4e2a\u67e5\u8be2\u5206\u522b\u76f8\u5f53\u4e8e mongo<\/code> shell \u67e5\u8be2\uff1a<\/p>\n
db.test.find({ a: null})\ndb.test.find({ $or: [{ a: { $exists: false }}, { a: { $type: \"null\" }}]})<\/pre>\n
\u8bf7\u6ce8\u610f\uff0c\u8fc7\u6ee4\u5668 { a: { $exists: false }}<\/code> \u4ec5\u8fd4\u56de\u4e00\u4e2a _id: 2<\/code> \u7684\u6587\u6863\u3002\u5e76\u4e14\uff0c\u8fc7\u6ee4\u5668 { a: {$type: \"null\" }}<\/code> \u8fd4\u56de\u4e00\u4e2a _id: 3<\/code> \u7684\u6587\u6863\u3002\u8bf7\u6ce8\u610f\uff0c\u5b57\u7b26\u4e32\u503c \"null\"<\/code> \u53ef\u4ee5\u66ff\u6362\u4e3a\u6570\u5b57 10<\/code> \uff0c\u5e76\u83b7\u5f97\u76f8\u540c\u7684\u7ed3\u679c\u3002\u8fd9\u662f\u56e0\u4e3a null<\/code> \u7684 \u8868\u793a\u4e3a \"null\"<\/code> \u6216 10<\/code>\u3002<\/p>\n
\u672c\u7bc7\u5173\u4e8e\u300aGolang\u548cMongodb\u67e5\u8be2\u5217\u4e0d\u5b58\u5728\u6216\u4e3a\u7a7a\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8eGolang\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207654","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207654","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=207654"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207654\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}