{"id":207369,"date":"2025-07-08T11:08:42","date_gmt":"2025-07-08T03:08:42","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207369\/"},"modified":"2025-07-08T11:08:42","modified_gmt":"2025-07-08T03:08:42","slug":"%e6%95%b4%e6%95%b0%e6%ba%a2%e5%87%ba-golang","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207369\/","title":{"rendered":"\u6574\u6570\u6ea2\u51fa-golang"},"content":{"rendered":"

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

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u6574\u6570\u6ea2\u51fa-golang<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-21 23:24:38<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u600e\u4e48\u5165\u95e8Golang\u7f16\u7a0b\uff1f\u9700\u8981\u5b66\u4e60\u54ea\u4e9b\u77e5\u8bc6\u70b9\uff1f\u8fd9\u662f\u65b0\u624b\u4eec\u521a\u63a5\u89e6\u7f16\u7a0b\u65f6\u5e38\u89c1\u7684\u95ee\u9898\uff1b\u4e0b\u9762\u5c31\u6765\u7ed9\u5927\u5bb6\u6574\u7406\u5206\u4eab\u4e00\u4e9b\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u591f\u7ed9\u521d\u5b66\u8005\u4e00\u4e9b\u5e2e\u52a9\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u4ecb\u7ecd\u300a\u6574\u6570\u6ea2\u51fa-golang\u300b\uff0c\u6d89\u53ca\u5230\uff0c\u6709\u9700\u8981\u7684\u53ef\u4ee5\u6536\u85cf\u4e00\u4e0b<\/p>\n

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

\u6211\u9047\u5230\u4e00\u4e9b\u6574\u6570\u6ea2\u51fa\u9519\u8bef\u3002 \u6211\u6709\u4e00\u4e2a\u4f7f\u7528 golang \u548c go-micro \u4f5c\u4e3a\u5fae\u670d\u52a1\u6846\u67b6\u6784\u5efa\u7684\u5fae\u670d\u52a1\u5e94\u7528\u7a0b\u5e8f\u3002 \u6211\u4f7f\u7528 nats \u4f5c\u4e3a\u6d88\u606f\u4ee3\u7406\u3002<\/p>\n

\u6211\u7684\u5fae\u670d\u52a1\u6709\u6548\u8d1f\u8f7d\u7684\u683c\u5f0f\u4e3a<\/p>\n

map[string]interface{}<\/pre>\n
\u5f53\u6211\u53d1\u5e03\u5305\u542b uint64 \u7684\u6709\u6548\u8d1f\u8f7d\u65f6\uff0c\u4f1a\u51fa\u73b0\u95ee\u9898\uff0c\u4f8b\u5982<\/p>\n
var id uint64 = 512281913614499841\n\n message := map[string]inteface{}\n message[\"id\"] = id<\/pre>\n
\uff08\u8fd9\u662f\u7531 cockroachdb \u751f\u6210\u7684\u552f\u4e00 id\uff09\uff0c\u5f53\u8ba2\u9605\u8005\u4ee5\u5b57\u8282\u5f62\u5f0f\u63a5\u6536\u6b64\u6d88\u606f\u5e76\u5c06\u5176\u89e3\u7ec4\u4e3a uint64 \u65f6\uff0c\u6211\u610f\u8bc6\u5230\u53d1\u751f\u4e86\u6ea2\u51fa\uff0c\u5e76\u4e14\u8be5\u503c\u53d8\u4e3a<\/p>\n
512281913614499840 \/\/this should be 512281913614499841<\/pre>\n
\u6ce8\u610f\u672b\u5c3e\u7684 0 \u800c\u4e0d\u662f 1<\/p>\n
\u6211\u521b\u5efa\u4e86 2 \u4e2a\u51fd\u6570\uff08overflowerror \u548c nooverflow\uff09 – \u89c1\u4e0b\u6587\u3002<\/p>\n
\u51fd\u6570overflowerror\u6a21\u62df\u5bfc\u81f4\u6ea2\u51fa\u7684\u4ee3\u7801<\/p>\n
\u5e76\u4e14 nooverflow \u6253\u5370\u6b63\u786e\u7684\u7ed3\u679c\uff0c\u56e0\u4e3a\u6211\u4f7f\u7528\u8fd9\u79cd\u683c\u5f0f\u7684\u6709\u6548\u8d1f\u8f7dmap[string][struct]\u800c\u4e0d\u662fmap[string]interface<\/p>\n
type usertype struct {\n    email string `json:\"email\"`\n    id    int64  `json:\"id\"`\n}\nfunc overflowerror() {\n\n        var id int64 = 512281913614499841\n\n        user := usertype{\n            email: \"example\",\n            id:    id,\n        }\n\n        message := map[string]interface{}{\n            \"data\": user,\n        }\n\n        \/\/mashal to byte to simulate service payload\n        servicepayload, err := json.marshal(message)\n\n        if err != nil {\n            log.println(err)\n        }\n\n        var receivedmessage map[string]interface{}\n\n        json.unmarshal(servicepayload, &receivedmessage)\n\n        var myuser usertype\n\n        mapstructure.decode(receivedmessage[\"data\"], &myuser)\n\n        log.println(\"---receivedmessage:\", myuser.id) \/\/prints 512281913614499840 - incorrect\n    }<\/pre>\n
\u65e0\u6ea2\u51fa<\/p>\n
type UserType struct {\n    Email string `json:\"email\"`\n    ID    int64  `json:\"id\"`\n}\nfunc noOverflow() {\n\n        var id int64 = 512281913614499841\n\n        message := map[string]UserType{}\n\n        message[\"data\"] = UserType{\n            Email: \"example\",\n            ID:    id,\n        }\n\n        byteMessage, err := json.Marshal(message)\n\n        if err != nil {\n            log.Println(err)\n        }\n\n        var msgMap map[string]UserType\n\n        json.Unmarshal(byteMessage, &msgMap)\n\n        log.Println(\"---myUser:\", msgMap[\"data\"].ID) \/\/ prints 512281913614499841 - correct\n    }<\/pre>\n
\u4e3a\u4e86\u907f\u514d\u5927\u91cf\u4ee3\u7801\u91cd\u5199\uff0c\u6211\u7559\u4e0b\u4e86\u7b2c\u4e00\u4e2a\u9009\u9879\uff0c\u6211\u5728 overflowerror \u51fd\u6570\u4e2d\u6a21\u62df\u4e86\u8be5\u9009\u9879\uff0c\u5e76\u5728\u4e0a\u9762\u8fdb\u884c\u4e86\u89e3\u91ca<\/p>\n
\u8fd9\u4e2a\u95ee\u9898\u6709\u89e3\u51b3\u529e\u6cd5\u5417\uff1f<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u8fd9\u4e0d\u662f\u6574\u6570\u6ea2\u51fa\u3002\u5982 \uff0c\u95ee\u9898\u5b9e\u9645\u4e0a\u662f JSON \u6570\u5b57\u503e\u5411\u4e8e\u8868\u793a\u4e3a\u6d6e\u70b9\u6570\uff0c\u800c float32<\/code> \u7684\u4f4d\u6570\u592a\u5c11\uff0c\u65e0\u6cd5\u4fdd\u5b58\u6b63\u786e\u7684\u503c\u3002\u5373\u4f7f Go \u9ed8\u8ba4\u4f7f\u7528\u7684 float64<\/code> \u4e5f\u8fd8\u4e0d\u591f\u3002<\/p>\n
\u67e5\u770b \uff08\u4e0d\u4ec5\u4ec5\u662f\u5df2\u63a5\u53d7\u7684\u7b54\u6848\uff09\u548c \u7684\u6240\u6709<\/em>\u7b54\u6848\u3002\u6216\u8005\uff0c\u67e5\u770b\u65e7\u95ee\u9898 \u53ca\u5176\u5df2\u63a5\u53d7\u7684\u7b54\u6848\u3002<\/p>\n
\u6839\u636e\u60a8\u9700\u8981\u54ea\u79cd\u4e92\u64cd\u4f5c\u6027\uff0c\u60a8\u53ef\u4ee5\u7ee7\u7eed\u5c06\u5b83\u4eec\u89e3\u7801\u4e3a\u6570\u5b57\uff0c\u4f46\u4f7f\u7528\u66f4\u590d\u6742\u7684\u89e3\u7801\u5668\u548c\/\u6216\u81ea\u5b9a\u4e49\u89e3\u7ec4\u5668\uff0c\u6216\u8005\u53ea\u662f\u5c06\u5176\u7f16\u7801\u4e3a JSON \u5b57\u7b26\u4e32\u3002\u5b9e\u9645\u4e0a\uff0c\u5f53\u8de8 Go + Python + TypeScript + \u5404\u79cd C++ \u5e93\u4f7f\u7528 JSON \u65f6\uff0c\u6211\u4eec1<\/sup>\u8bc9\u8bf8\u4e8e\u5b57\u7b26\u4e32\u7f16\u7801\u3002\u6211\u4eec\u6700\u7ec8\u53d1\u73b0\u8fd9\u8981\u53ef\u9760\u5f97\u591a\u3002 \uff08\u6211\u4eec\u4e0d\u5fc5\u5bf9 32 \u4f4d\u6574\u6570\u6267\u884c\u6b64\u64cd\u4f5c\uff0c\u53ea\u9700\u5bf9 64 \u4f4d\u6574\u6570\u6267\u884c\u6b64\u64cd\u4f5c\u3002\uff09<\/p>\n
\u8981\u4f7f\u7528\u975e\u9ed8\u8ba4\u89e3\u7801\u5668\uff0c\u8bf7\u7279\u522b\u53c2\u9605 \u53ca\u5176 \u9009\u9879\u3002<\/p>\n
1<\/sup>\u8fd9\u91cc\u7684\u201c\u6211\u4eec\u201d\u4e0d\u662f\u7687\u5bb6\u7684\u201c\u6211\u4eec\u201d\uff0c\u800c\u662f $job\uff0c\u9664\u4e86 TypeScript \u4e4b\u5916\uff0c\u6211\u63a5\u89e6\u8fc7\u6240\u6709\u8fd9\u4e9b\u3002<\/p>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a\u6574\u6570\u6ea2\u51fa-golang\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591aGolang\u77e5\u8bc6\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-207369","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207369","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=207369"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207369\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207369"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207369"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}