{"id":207396,"date":"2025-07-08T12:28:39","date_gmt":"2025-07-08T04:28:39","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207396\/"},"modified":"2025-07-08T12:28:39","modified_gmt":"2025-07-08T04:28:39","slug":"%e4%bd%bf%e7%94%a8-go-%e4%bb%8e-firestore-%e8%8e%b7%e5%8f%96%e5%8d%95%e4%b8%aa%e6%96%87%e6%a1%a3%e7%9a%84%e6%83%af%e7%94%a8%e6%96%b9%e6%b3%95%e6%98%af%e4%bb%80%e4%b9%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207396\/","title":{"rendered":"\u4f7f\u7528 Go \u4ece Firestore \u83b7\u53d6\u5355\u4e2a\u6587\u6863\u7684\u60ef\u7528\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f"},"content":{"rendered":"

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

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u4f7f\u7528 Go \u4ece Firestore \u83b7\u53d6\u5355\u4e2a\u6587\u6863\u7684\u60ef\u7528\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-22 10:54:39<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898\u662f<\/span>\u300a\u4f7f\u7528 Go \u4ece Firestore \u83b7\u53d6\u5355\u4e2a\u6587\u6863\u7684\u60ef\u7528\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f\u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8eGolang<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span><\/p>\n

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

\u6211\u6b63\u5728\u7f16\u5199\u4e00\u4e2a go \u670d\u52a1\uff0c\u7528\u4e8e\u68c0\u7d22\u5177\u6709\u7ed9\u5b9a id \u7684\u5355\u4e2a firestore \u6587\u6863\u3002\u5b9e\u65bd\u8349\u6848\u5982\u4e0b\u3002\u8be5\u4ee3\u7801\u4f3c\u4e4e\u53ef\u4ee5\u5de5\u4f5c\u3002 getaccount<\/code> \u8fd4\u56de map[string] \u63a5\u53e3{}<\/code>\uff0c\u5b83\u53ef\u4ee5\u662f nil<\/code> \u6216\u8bbe\u7f6e\u4e3a\u6587\u6863\u6570\u636e\u7684\u8868\u793a\u5f62\u5f0f\u3002<\/p>\n

go doc firestore.documentref.get<\/code> \u663e\u793a\uff1a<\/p>\n

func (d *documentref) get(ctx context.context) (_ *documentsnapshot, err \u9519\u8bef) get \u68c0\u7d22\u6587\u6863\u3002\u5982\u679c\u6587\u6863\u4e0d\u5b58\u5728\uff0cget \u8fd4\u56de\u4e00\u4e2a notfound \u9519\u8bef\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u68c0\u67e5 status.code(err) ==codes.notfound \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cget \u8fd4\u56de\u4e00\u4e2a\u975e\u96f6 documentsnapshot\uff0c\u5176 exists \u65b9\u6cd5 \u8fd4\u56de false\uff0c\u5176 readtime \u4e3a\u8bfb\u64cd\u4f5c\u5931\u8d25\u7684\u65f6\u95f4\u3002 <\/p>\n

\u5982\u679c status.code(err) ==codes.notfound<\/code> \u5df2\u7ecf\u6307\u793a\u5176\u5b58\u5728\uff0c\u4e3a\u4ec0\u4e48 documentsnapshot<\/code> \u8fd8\u5305\u542b exists()<\/code> \u65b9\u6cd5\uff1f<\/p>\n

go doc firestore.documentsnapshot.datato<\/code> \u8fd8\u8bf4\uff1a<\/p>\n

\u5982\u679c\u6587\u6863\u4e0d\u5b58\u5728\uff0cdatato \u5c06\u8fd4\u56de notfound \u9519\u8bef\u3002 <\/p>\n

\u6211\u662f\u5426\u8fd8\u5e94\u8be5\u68c0\u67e5\u4ee3\u7801\u8def\u5f84\u4e2d b \u70b9\u7684 status.code(err) ==codes.notfound<\/code> \uff1f<\/p>\n

type srv struct {\n    fs *firestore.client\n}\n\n\/\/ ...\n\nm, err := srv.getaccount(ctx, \"81199475\")\nif err != nil {\n    log.fatal(err)\n}\nif m == nil {\n    fmt.println(\"not found\")\n    os.exit(0)\n}\nfmt.printf(\"%#v\\n\", m)\n\nfunc (s *srv) getaccount(ctx context.context, id string) (map[string]interface{}, error) {\n    docsnap, err := s.fs.doc(\"accounts\/\" + id).get(ctx)\n    if status.code(err) == codes.notfound {\n        return nil, nil\n    }\n    if err != nil {\n        return nil, err\n    }\n\n    var m map[string]interface{}\n    if err := docsnap.datato(&m); err != nil {\n        \/\/ point b\n        return nil, err\n    }\n    return m, nil\n}\n<\/pre>\n
\u66f4\u65b0\uff1a<\/strong>\u6709\u4eba\u6307\u51fa\uff0c\u4e0e\u5176\u8fd4\u56de nil<\/code> \u6765\u6307\u793a\u672a\u627e\u5230\u6587\u6863\uff0c\u4e0d\u5982\u5c06\u5e95\u5c42 firestore \u9519\u8bef\u4f20\u64ad\u5230\u8c03\u7528\u5806\u6808\uff0c\u6216\u8005\u63d0\u4f9b\u81ea\u5b9a\u4e49\u9519\u8bef\u3002<\/p>\n
var ErrAccountNotFound = errors.New(\"account\/account-not-found\")\n\n\/\/ ...\n\nif status.Code(err) == codes.NotFound {\n    return nil, ErrAccountNotFound\n}\n<\/pre>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u60a8\u53ea\u9700\u68c0\u67e5 get<\/code> \u8fd4\u56de\u7684\u9519\u8bef\u662f\u5426\u672a\u627e\u5230\u3002<\/p>\n
documentsnapshot.exists()<\/code> \u65b9\u6cd5\u5bf9\u4e8e\u8fd4\u56de\u591a\u4e2a\u5feb\u7167\u7684 getall<\/code> \u7b49\u65b9\u6cd5\u5f88\u6709\u7528\u3002\u5f53\u627e\u4e0d\u5230\u5355\u4e2a\u6587\u6863\u65f6\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u4e0d\u4f1a\u8fd4\u56de\u9519\u8bef\u3002<\/p>\n
\u4f7f\u7528 documentsnapshot.data()<\/code> \u7b80\u5316\u4ee3\u7801\uff1a<\/p>\n
func (s *srv) GetAccount(ctx context.Context, id string) (map[string]interface{}, error) {\n    docSnap, err := s.fs.Doc(\"accounts\/\" + id).Get(ctx)\n    if err != nil {\n        \/\/ Translate firestorm not found to application specific not found.\n        if status.Code(err) == codes.NotFound {\n            err = ErrAccountNotFound\n        }\n        return nil, err\n    }\n    return docSnap.Data(), nil\n}<\/pre>\n
\u4eca\u5929\u5173\u4e8e\u300a\u4f7f\u7528 Go \u4ece Firestore \u83b7\u53d6\u5355\u4e2a\u6587\u6863\u7684\u60ef\u7528\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\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-207396","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207396","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=207396"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207396\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207396"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207396"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}