Há mais exemplos do AWS SDK disponíveis no repositório do GitHub Documento de Exemplos do AWS SDK.
Exemplos de código para o Amazon Keyspaces usando SDKs da AWS
Os exemplos de código a seguir mostram como usar o Amazon Keyspaces (para Apache Cassandra) com um kit de desenvolvimento de software (SDK) da AWS.
As noções básicas são exemplos de código que mostram como realizar as operações essenciais em um serviço.
Ações são trechos de código de programas maiores e devem ser executadas em contexto. Embora as ações mostrem como chamar perfis de serviço individuais, você pode ver as ações no contexto em seus cenários relacionados.
Conceitos básicos
Os exemplos de código a seguir mostram como começar a usar o Amazon Keyspaces.
- .NET
-
- SDK para .NET
-
namespace KeyspacesActions;
public class HelloKeyspaces
{
private static ILogger logger = null!;
static async Task Main(string[] args)
{
// Set up dependency injection for Amazon Keyspaces (for Apache Cassandra).
using var host = Host.CreateDefaultBuilder(args)
.ConfigureLogging(logging =>
logging.AddFilter("System", LogLevel.Debug)
.AddFilter<DebugLoggerProvider>("Microsoft", LogLevel.Information)
.AddFilter<ConsoleLoggerProvider>("Microsoft", LogLevel.Trace))
.ConfigureServices((_, services) =>
services.AddAWSService<IAmazonKeyspaces>()
.AddTransient<KeyspacesWrapper>()
)
.Build();
logger = LoggerFactory.Create(builder => { builder.AddConsole(); })
.CreateLogger<HelloKeyspaces>();
var keyspacesClient = host.Services.GetRequiredService<IAmazonKeyspaces>();
var keyspacesWrapper = new KeyspacesWrapper(keyspacesClient);
Console.WriteLine("Hello, Amazon Keyspaces! Let's list your keyspaces:");
await keyspacesWrapper.ListKeyspaces();
}
}
- Java
-
- SDK para Java 2.x
-
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.keyspaces.KeyspacesClient;
import software.amazon.awssdk.services.keyspaces.model.KeyspaceSummary;
import software.amazon.awssdk.services.keyspaces.model.KeyspacesException;
import software.amazon.awssdk.services.keyspaces.model.ListKeyspacesRequest;
import software.amazon.awssdk.services.keyspaces.model.ListKeyspacesResponse;
import java.util.List;
/**
* Before running this Java (v2) code example, set up your development
* environment, including your credentials.
*
* For more information, see the following documentation topic:
*
* https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/get-started.html
*/
public class HelloKeyspaces {
public static void main(String[] args) {
Region region = Region.US_EAST_1;
KeyspacesClient keyClient = KeyspacesClient.builder()
.region(region)
.build();
listKeyspaces(keyClient);
}
public static void listKeyspaces(KeyspacesClient keyClient) {
try {
ListKeyspacesRequest keyspacesRequest = ListKeyspacesRequest.builder()
.maxResults(10)
.build();
ListKeyspacesResponse response = keyClient.listKeyspaces(keyspacesRequest);
List<KeyspaceSummary> keyspaces = response.keyspaces();
for (KeyspaceSummary keyspace : keyspaces) {
System.out.println("The name of the keyspace is " + keyspace.keyspaceName());
}
} catch (KeyspacesException e) {
System.err.println(e.awsErrorDetails().errorMessage());
System.exit(1);
}
}
}
- Kotlin
-
- SDK para Kotlin
-
/**
Before running this Kotlin code example, set up your development environment, including your credentials.
For more information, see the following documentation topic:
https://docs.aws.amazon.com/sdk-for-kotlin/latest/developer-guide/setup.html
*/
suspend fun main() {
listKeyspaces()
}
suspend fun listKeyspaces() {
val keyspacesRequest =
ListKeyspacesRequest {
maxResults = 10
}
KeyspacesClient.fromEnvironment { region = "us-east-1" }.use { keyClient ->
val response = keyClient.listKeyspaces(keyspacesRequest)
response.keyspaces?.forEach { keyspace ->
println("The name of the keyspace is ${keyspace.keyspaceName}")
}
}
}
- Python
-
- SDK para Python (Boto3).
-
import boto3
def hello_keyspaces(keyspaces_client):
"""
Use the AWS SDK for Python (Boto3) to create an Amazon Keyspaces (for Apache Cassandra)
client and list the keyspaces in your account.
This example uses the default settings specified in your shared credentials
and config files.
:param keyspaces_client: A Boto3 Amazon Keyspaces Client object. This object wraps
the low-level Amazon Keyspaces service API.
"""
print("Hello, Amazon Keyspaces! Let's list some of your keyspaces:\n")
for ks in keyspaces_client.list_keyspaces(maxResults=5).get("keyspaces", []):
print(ks["keyspaceName"])
print(f"\t{ks['resourceArn']}")
if __name__ == "__main__":
hello_keyspaces(boto3.client("keyspaces"))
