v1 更新主题架构(已废弃)
使用集合让一切井井有条
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[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],[],[],[],null,["# v1 Update the topic schema (DEPRECATED)\n\n(DEPRECATED) Update the topic schema\n\nCode sample\n-----------\n\n### Go\n\n\nBefore trying this sample, follow the Go setup instructions in the\n[Pub/Sub quickstart using\nclient libraries](/pubsub/docs/quickstart-client-libraries).\n\n\nFor more information, see the\n[Pub/Sub Go API\nreference documentation](https://godoc.org/cloud.google.com/go/pubsub).\n\n\nTo authenticate to Pub/Sub, 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 import (\n \t\"context\"\n \t\"fmt\"\n \t\"io\"\n\n \t\"cloud.google.com/go/pubsub\"\n )\n\n func updateTopicSchema(w io.Writer, projectID, topicID, firstRevisionID, lastRevisionID string) error {\n \t// projectID := \"my-project-id\"\n \t// topicID := \"my-topic\"\n \t// firstRevisionID := \"my-revision-id\"\n \t// lastRevisionID := \"my-revision-id\"\n \tctx := context.Background()\n \tclient, err := pubsub.https://cloud.google.com/go/docs/reference/cloud.google.com/go/pubsub/latest/index.html#cloud_google_com_go_pubsub_Client_NewClient(ctx, projectID)\n \tif err != nil {\n \t\treturn fmt.Errorf(\"pubsub.NewClient: %w\", err)\n \t}\n \tt := client.Topic(topicID)\n\n \t// This updates the first / last revision ID for the topic's schema.\n \t// To clear the schema entirely, use a zero valued (empty) SchemaSettings.\n \ttc := pubsub.TopicConfigToUpdate{\n \t\tSchemaSettings: &pubsub.SchemaSettings{\n \t\t\tFirstRevisionID: firstRevisionID,\n \t\t\tLastRevisionID: lastRevisionID,\n \t\t},\n \t}\n\n \tgotTopicCfg, err := t.Update(ctx, tc)\n \tif err != nil {\n \t\tfmt.Fprintf(w, \"topic.Update err: %v\\n\", gotTopicCfg)\n \t\treturn err\n \t}\n \tfmt.Fprintf(w, \"Updated topic with schema: %#v\\n\", gotTopicCfg)\n \treturn nil\n }\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=pubsub)."]]