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샤드 사용 중 Firestore 문서 가져오기
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코드 샘플
C#
Firestore에 인증하려면 애플리케이션 기본 사용자 인증 정보를 설정합니다.
자세한 내용은 로컬 개발 환경의 인증 설정을 참조하세요.
Go
Firestore에 인증하려면 애플리케이션 기본 사용자 인증 정보를 설정합니다.
자세한 내용은 로컬 개발 환경의 인증 설정을 참조하세요.
Node.js
Firestore에 인증하려면 애플리케이션 기본 사용자 인증 정보를 설정합니다.
자세한 내용은 로컬 개발 환경의 인증 설정을 참조하세요.
PHP
Firestore에 인증하려면 애플리케이션 기본 사용자 인증 정보를 설정합니다.
자세한 내용은 로컬 개발 환경의 인증 설정을 참조하세요.
Python
Firestore에 인증하려면 애플리케이션 기본 사용자 인증 정보를 설정합니다.
자세한 내용은 로컬 개발 환경의 인증 설정을 참조하세요.
Ruby
Firestore에 인증하려면 애플리케이션 기본 사용자 인증 정보를 설정합니다.
자세한 내용은 로컬 개발 환경의 인증 설정을 참조하세요.
달리 명시되지 않는 한 이 페이지의 콘텐츠에는 Creative Commons Attribution 4.0 라이선스에 따라 라이선스가 부여되며, 코드 샘플에는 Apache 2.0 라이선스에 따라 라이선스가 부여됩니다. 자세한 내용은 Google Developers 사이트 정책을 참조하세요. 자바는 Oracle 및/또는 Oracle 계열사의 등록 상표입니다.
[[["이해하기 쉬움","easyToUnderstand","thumb-up"],["문제가 해결됨","solvedMyProblem","thumb-up"],["기타","otherUp","thumb-up"]],[["이해하기 어려움","hardToUnderstand","thumb-down"],["잘못된 정보 또는 샘플 코드","incorrectInformationOrSampleCode","thumb-down"],["필요한 정보/샘플이 없음","missingTheInformationSamplesINeed","thumb-down"],["번역 문제","translationIssue","thumb-down"],["기타","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis document provides code samples in multiple languages (C#, Go, Node.js, PHP, Python, Ruby) for retrieving a total count from a Firestore document that uses sharding.\u003c/p\u003e\n"],["\u003cp\u003eThe core functionality involves iterating through a collection of "shards" within a document and summing up the "count" value from each shard to obtain the total.\u003c/p\u003e\n"],["\u003cp\u003eEach code sample requires the user to set up Application Default Credentials for Firestore authentication in their local development environment, which is further explained in the link provided.\u003c/p\u003e\n"],["\u003cp\u003eThe document also contains links to more detailed documentation on the topic of distributed counters to enhance the user's understanding of the use-case.\u003c/p\u003e\n"]]],[],null,["# Getting a Firestore document while using shards\n\nExplore further\n---------------\n\n\nFor detailed documentation that includes this code sample, see the following:\n\n- [Distributed counters](https://firebase.google.com/docs/firestore/solutions/counters)\n- [Support frequent and distributed counters](/firestore/native/docs/solutions/counters)\n\nCode sample\n-----------\n\n### C#\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n /// \u003csummary\u003e\n /// Get total count across all shards.\n /// \u003c/summary\u003e\n /// \u003cparam name=\"docRef\"\u003eThe document reference \u003csee cref=\"DocumentReference\"/\u003e\u003c/param\u003e\n /// \u003creturns\u003eThe \u003csee cref=\"int\"/\u003e\u003c/returns\u003e\n private static async Task\u003cint\u003e GetCountAsync(DocumentReference docRef)\n {\n var snapshotList = await docRef.Collection(\"shards\").GetSnapshotAsync();\n return snapshotList.Sum(shard =\u003e shard.GetValue\u003cint\u003e(\"count\"));\n }\n\n### Go\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n\n // getCount returns a total count across all shards.\n func (c *Counter) getCount(ctx context.Context, docRef *firestore.DocumentRef) (int64, error) {\n \tvar total int64\n \tshards := docRef.Collection(\"shards\").Documents(ctx)\n \tfor {\n \t\tdoc, err := shards.Next()\n \t\tif err == iterator.Done {\n \t\t\tbreak\n \t\t}\n \t\tif err != nil {\n \t\t\treturn 0, fmt.Errorf(\"Next: %w\", err)\n \t\t}\n\n \t\tvTotal := doc.Data()[\"Count\"]\n \t\tshardCount, ok := vTotal.(int64)\n \t\tif !ok {\n \t\t\treturn 0, fmt.Errorf(\"firestore: invalid dataType %T, want int64\", vTotal)\n \t\t}\n \t\ttotal += shardCount\n \t}\n \treturn total, nil\n }\n\n### Node.js\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n async function getCount(docRef) {\n const querySnapshot = await docRef.collection('shards').get();\n const documents = querySnapshot.docs;\n\n let count = 0;\n for (const doc of documents) {\n count += doc.get('count');\n }\n return count;\n }\n\n### PHP\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n $result = 0;\n $docCollection = $db-\u003ecollection('samples/php/distributedCounters')-\u003edocuments();\n foreach ($docCollection as $doc) {\n $result += $doc-\u003edata()['Cnt'];\n }\n\n### Python\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n def get_count(self, doc_ref):\n \"\"\"Return a total count across all shards.\"\"\"\n total = 0\n shards = doc_ref.collection(\"shards\").list_documents()\n for shard in shards:\n total += shard.get().to_dict().get(\"count\", 0)\n return total\n\n### Ruby\n\n\nTo authenticate to Firestore, set up Application Default Credentials.\nFor more information, see\n\n[Set up authentication for a local development environment](/docs/authentication/set-up-adc-local-dev-environment).\n\n # project_id = \"Your Google Cloud Project ID\"\n # collection_path = \"shards\"\n\n require \"google/cloud/firestore\"\n\n firestore = Google::Cloud::https://cloud.google.com/ruby/docs/reference/google-cloud-firestore/latest/Google-Cloud-Firestore.html.https://cloud.google.com/ruby/docs/reference/google-cloud-firestore/latest/Google-Cloud-Firestore.html project_id: project_id\n\n shards_ref = firestore.https://cloud.google.com/ruby/docs/reference/google-cloud-firestore/latest/Google-Cloud-Firestore-Client.html collection_path\n\n count = 0\n shards_ref.get do |doc_ref|\n count += doc_ref[:count]\n end\n\n puts \"Count value is #{count}.\"\n\nWhat's next\n-----------\n\n\nTo search and filter code samples for other Google Cloud products, see the\n[Google Cloud sample browser](/docs/samples?product=firestore)."]]