列出架构的修订版本

列出架构的修订版本

深入探索

如需查看包含此代码示例的详细文档，请参阅以下内容：

• 创建和管理架构

代码示例

Go

在尝试此示例之前，请按照使用客户端库的 Pub/Sub 快速入门中的 Go 设置说明进行操作。如需了解详情，请参阅 Pub/Sub Go API 参考文档。

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import (
	"context"
	"fmt"
	"io"

	"cloud.google.com/go/pubsub"
	"google.golang.org/api/iterator"
)

func listSchemaRevisions(w io.Writer, projectID, schemaID string) ([]*pubsub.SchemaConfig, error) {
	// projectID := "my-project-id"
	// schemaID := "my-schema-id"
	ctx := context.Background()
	client, err := pubsub.NewSchemaClient(ctx, projectID)
	if err != nil {
		return nil, fmt.Errorf("pubsub.NewSchemaClient: %v", err)
	}
	defer client.Close()

	var schemas []*pubsub.SchemaConfig

	schemaIter := client.ListSchemaRevisions(ctx, schemaID, pubsub.SchemaViewFull)
	for {
		sc, err := schemaIter.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return nil, fmt.Errorf("schemaIter.Next: %v", err)
		}
		fmt.Fprintf(w, "Got schema revision: %#v\n", sc)
		schemas = append(schemas, sc)
	}

	fmt.Fprintf(w, "Got %d schema revisions", len(schemas))
	return schemas, nil
}

Java

在尝试此示例之前，请按照使用客户端库的 Pub/Sub 快速入门中的 Java 设置说明进行操作。如需了解详情，请参阅 Pub/Sub Java API 参考文档。

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import com.google.cloud.pubsub.v1.SchemaServiceClient;
import com.google.pubsub.v1.Schema;
import com.google.pubsub.v1.SchemaName;
import java.io.IOException;

public class ListSchemaRevisionsExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String schemaId = "your-schema-id";

    listSchemaRevisionsExample(projectId, schemaId);
  }

  public static void listSchemaRevisionsExample(String projectId, String schemaId)
      throws IOException {
    SchemaName schemaName = SchemaName.of(projectId, schemaId);

    try (SchemaServiceClient schemaServiceClient = SchemaServiceClient.create()) {
      for (Schema schema : schemaServiceClient.listSchemaRevisions(schemaName).iterateAll()) {
        System.out.println(schema);
      }
      System.out.println("Listed schema revisions.");
    }
  }
}

Python

在尝试此示例之前，请按照使用客户端库的 Pub/Sub 快速入门中的 Python 设置说明进行操作。如需了解详情，请参阅 Pub/Sub Python API 参考文档。

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from google.cloud.pubsub import SchemaServiceClient

# TODO(developer): Replace these variables before running the sample.
# project_id = "your-project-id"
# schema_id = "your-schema-id"

schema_client = SchemaServiceClient()
schema_path = schema_client.schema_path(project_id, schema_id)

for schema in schema_client.list_schema_revisions(request={"name": schema_path}):
    print(schema)

print("Listed schema revisions.")

后续步骤

如需搜索和过滤其他 Google Cloud 产品的代码示例，请参阅 Google Cloud 示例浏览器。