Gunakan DescribeTable dengan AWS SDK atau CLI - AWS SDKContoh Kode

Ada lebih banyak AWS SDK contoh yang tersedia di GitHub repo SDKContoh AWS Dokumen.

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Gunakan DescribeTable dengan AWS SDK atau CLI

Contoh kode berikut menunjukkan cara menggunakanDescribeTable.

Contoh tindakan adalah kutipan kode dari program yang lebih besar dan harus dijalankan dalam konteks. Anda dapat melihat tindakan ini dalam konteks dalam contoh kode berikut:

.NET
AWS SDK for .NET
catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS.

private static async Task GetTableInformation() { Console.WriteLine("\n*** Retrieving table information ***"); var response = await Client.DescribeTableAsync(new DescribeTableRequest { TableName = ExampleTableName }); var table = response.Table; Console.WriteLine($"Name: {table.TableName}"); Console.WriteLine($"# of items: {table.ItemCount}"); Console.WriteLine($"Provision Throughput (reads/sec): " + $"{table.ProvisionedThroughput.ReadCapacityUnits}"); Console.WriteLine($"Provision Throughput (writes/sec): " + $"{table.ProvisionedThroughput.WriteCapacityUnits}"); }
  • Untuk API detailnya, lihat DescribeTabledi AWS SDK for .NET APIReferensi.

Bash
AWS CLI dengan skrip Bash
catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS.

############################################################################### # function dynamodb_describe_table # # This function returns the status of a DynamoDB table. # # Parameters: # -n table_name -- The name of the table. # # Response: # - TableStatus: # And: # 0 - Table is active. # 1 - If it fails. ############################################################################### function dynamodb_describe_table { local table_name local option OPTARG # Required to use getopts command in a function. ####################################### # Function usage explanation ####################################### function usage() { echo "function dynamodb_describe_table" echo "Describe the status of a DynamoDB table." echo " -n table_name -- The name of the table." echo "" } # Retrieve the calling parameters. while getopts "n:h" option; do case "${option}" in n) table_name="${OPTARG}" ;; h) usage return 0 ;; \?) echo "Invalid parameter" usage return 1 ;; esac done export OPTIND=1 if [[ -z "$table_name" ]]; then errecho "ERROR: You must provide a table name with the -n parameter." usage return 1 fi local table_status table_status=$( aws dynamodb describe-table \ --table-name "$table_name" \ --output text \ --query 'Table.TableStatus' ) local error_code=${?} if [[ $error_code -ne 0 ]]; then aws_cli_error_log "$error_code" errecho "ERROR: AWS reports describe-table operation failed.$table_status" return 1 fi echo "$table_status" return 0 }

Fungsi utilitas yang digunakan dalam contoh ini.

############################################################################### # function errecho # # This function outputs everything sent to it to STDERR (standard error output). ############################################################################### function errecho() { printf "%s\n" "$*" 1>&2 } ############################################################################## # function aws_cli_error_log() # # This function is used to log the error messages from the AWS CLI. # # See https://docs.aws.amazon.com/cli/latest/topic/return-codes.html#cli-aws-help-return-codes. # # The function expects the following argument: # $1 - The error code returned by the AWS CLI. # # Returns: # 0: - Success. # ############################################################################## function aws_cli_error_log() { local err_code=$1 errecho "Error code : $err_code" if [ "$err_code" == 1 ]; then errecho " One or more S3 transfers failed." elif [ "$err_code" == 2 ]; then errecho " Command line failed to parse." elif [ "$err_code" == 130 ]; then errecho " Process received SIGINT." elif [ "$err_code" == 252 ]; then errecho " Command syntax invalid." elif [ "$err_code" == 253 ]; then errecho " The system environment or configuration was invalid." elif [ "$err_code" == 254 ]; then errecho " The service returned an error." elif [ "$err_code" == 255 ]; then errecho " 255 is a catch-all error." fi return 0 }
  • Untuk API detailnya, lihat DescribeTabledi Referensi AWS CLI Perintah.

C++
SDKuntuk C ++
catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS.

//! Describe an Amazon DynamoDB table. /*! \sa describeTable() \param tableName: The DynamoDB table name. \param clientConfiguration: AWS client configuration. \return bool: Function succeeded. */ bool AwsDoc::DynamoDB::describeTable(const Aws::String &tableName, const Aws::Client::ClientConfiguration &clientConfiguration) { Aws::DynamoDB::DynamoDBClient dynamoClient(clientConfiguration); Aws::DynamoDB::Model::DescribeTableRequest request; request.SetTableName(tableName); const Aws::DynamoDB::Model::DescribeTableOutcome &outcome = dynamoClient.DescribeTable( request); if (outcome.IsSuccess()) { const Aws::DynamoDB::Model::TableDescription &td = outcome.GetResult().GetTable(); std::cout << "Table name : " << td.GetTableName() << std::endl; std::cout << "Table ARN : " << td.GetTableArn() << std::endl; std::cout << "Status : " << Aws::DynamoDB::Model::TableStatusMapper::GetNameForTableStatus( td.GetTableStatus()) << std::endl; std::cout << "Item count : " << td.GetItemCount() << std::endl; std::cout << "Size (bytes): " << td.GetTableSizeBytes() << std::endl; const Aws::DynamoDB::Model::ProvisionedThroughputDescription &ptd = td.GetProvisionedThroughput(); std::cout << "Throughput" << std::endl; std::cout << " Read Capacity : " << ptd.GetReadCapacityUnits() << std::endl; std::cout << " Write Capacity: " << ptd.GetWriteCapacityUnits() << std::endl; const Aws::Vector<Aws::DynamoDB::Model::AttributeDefinition> &ad = td.GetAttributeDefinitions(); std::cout << "Attributes" << std::endl; for (const auto &a: ad) std::cout << " " << a.GetAttributeName() << " (" << Aws::DynamoDB::Model::ScalarAttributeTypeMapper::GetNameForScalarAttributeType( a.GetAttributeType()) << ")" << std::endl; } else { std::cerr << "Failed to describe table: " << outcome.GetError().GetMessage(); } return outcome.IsSuccess(); }
  • Untuk API detailnya, lihat DescribeTabledi AWS SDK for C++ APIReferensi.

CLI
AWS CLI

Untuk menggambarkan tabel

describe-tableContoh berikut menjelaskan MusicCollection tabel.

aws dynamodb describe-table \ --table-name MusicCollection

Output:

{ "Table": { "AttributeDefinitions": [ { "AttributeName": "Artist", "AttributeType": "S" }, { "AttributeName": "SongTitle", "AttributeType": "S" } ], "ProvisionedThroughput": { "NumberOfDecreasesToday": 0, "WriteCapacityUnits": 5, "ReadCapacityUnits": 5 }, "TableSizeBytes": 0, "TableName": "MusicCollection", "TableStatus": "ACTIVE", "KeySchema": [ { "KeyType": "HASH", "AttributeName": "Artist" }, { "KeyType": "RANGE", "AttributeName": "SongTitle" } ], "ItemCount": 0, "CreationDateTime": 1421866952.062 } }

Untuk informasi selengkapnya, lihat Menjelaskan Tabel di Panduan Pengembang Amazon DynamoDB.

  • Untuk API detailnya, lihat DescribeTabledi Referensi AWS CLI Perintah.

Go
SDKuntuk Go V2
catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS.

// TableBasics encapsulates the Amazon DynamoDB service actions used in the examples. // It contains a DynamoDB service client that is used to act on the specified table. type TableBasics struct { DynamoDbClient *dynamodb.Client TableName string } // TableExists determines whether a DynamoDB table exists. func (basics TableBasics) TableExists(ctx context.Context) (bool, error) { exists := true _, err := basics.DynamoDbClient.DescribeTable( ctx, &dynamodb.DescribeTableInput{TableName: aws.String(basics.TableName)}, ) if err != nil { var notFoundEx *types.ResourceNotFoundException if errors.As(err, &notFoundEx) { log.Printf("Table %v does not exist.\n", basics.TableName) err = nil } else { log.Printf("Couldn't determine existence of table %v. Here's why: %v\n", basics.TableName, err) } exists = false } return exists, err }
  • Untuk API detailnya, lihat DescribeTabledi AWS SDK for Go APIReferensi.

Java
SDKuntuk Java 2.x
catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS.

import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.dynamodb.model.DynamoDbException; import software.amazon.awssdk.services.dynamodb.DynamoDbClient; import software.amazon.awssdk.services.dynamodb.model.AttributeDefinition; import software.amazon.awssdk.services.dynamodb.model.DescribeTableRequest; import software.amazon.awssdk.services.dynamodb.model.ProvisionedThroughputDescription; import software.amazon.awssdk.services.dynamodb.model.TableDescription; 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 DescribeTable { public static void main(String[] args) { final String usage = """ Usage: <tableName> Where: tableName - The Amazon DynamoDB table to get information about (for example, Music3). """; if (args.length != 1) { System.out.println(usage); System.exit(1); } String tableName = args[0]; System.out.format("Getting description for %s\n\n", tableName); Region region = Region.US_EAST_1; DynamoDbClient ddb = DynamoDbClient.builder() .region(region) .build(); describeDymamoDBTable(ddb, tableName); ddb.close(); } public static void describeDymamoDBTable(DynamoDbClient ddb, String tableName) { DescribeTableRequest request = DescribeTableRequest.builder() .tableName(tableName) .build(); try { TableDescription tableInfo = ddb.describeTable(request).table(); if (tableInfo != null) { System.out.format("Table name : %s\n", tableInfo.tableName()); System.out.format("Table ARN : %s\n", tableInfo.tableArn()); System.out.format("Status : %s\n", tableInfo.tableStatus()); System.out.format("Item count : %d\n", tableInfo.itemCount()); System.out.format("Size (bytes): %d\n", tableInfo.tableSizeBytes()); ProvisionedThroughputDescription throughputInfo = tableInfo.provisionedThroughput(); System.out.println("Throughput"); System.out.format(" Read Capacity : %d\n", throughputInfo.readCapacityUnits()); System.out.format(" Write Capacity: %d\n", throughputInfo.writeCapacityUnits()); List<AttributeDefinition> attributes = tableInfo.attributeDefinitions(); System.out.println("Attributes"); for (AttributeDefinition a : attributes) { System.out.format(" %s (%s)\n", a.attributeName(), a.attributeType()); } } } catch (DynamoDbException e) { System.err.println(e.getMessage()); System.exit(1); } System.out.println("\nDone!"); } }
  • Untuk API detailnya, lihat DescribeTabledi AWS SDK for Java 2.x APIReferensi.

JavaScript
SDKuntuk JavaScript (v3)
catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS.

import { DescribeTableCommand, DynamoDBClient } from "@aws-sdk/client-dynamodb"; const client = new DynamoDBClient({}); export const main = async () => { const command = new DescribeTableCommand({ TableName: "Pastries", }); const response = await client.send(command); console.log(`TABLE NAME: ${response.Table.TableName}`); console.log(`TABLE ITEM COUNT: ${response.Table.ItemCount}`); return response; };
SDKuntuk JavaScript (v2)
catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS.

// Load the AWS SDK for Node.js var AWS = require("aws-sdk"); // Set the region AWS.config.update({ region: "REGION" }); // Create the DynamoDB service object var ddb = new AWS.DynamoDB({ apiVersion: "2012-08-10" }); var params = { TableName: process.argv[2], }; // Call DynamoDB to retrieve the selected table descriptions ddb.describeTable(params, function (err, data) { if (err) { console.log("Error", err); } else { console.log("Success", data.Table.KeySchema); } });
PowerShell
Alat untuk PowerShell

Contoh 1: Mengembalikan rincian tabel yang ditentukan.

Get-DDBTable -TableName "myTable"
  • Untuk API detailnya, lihat DescribeTabledi AWS Tools for PowerShell Referensi Cmdlet.

Python
SDKuntuk Python (Boto3)
catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS.

class Movies: """Encapsulates an Amazon DynamoDB table of movie data. Example data structure for a movie record in this table: { "year": 1999, "title": "For Love of the Game", "info": { "directors": ["Sam Raimi"], "release_date": "1999-09-15T00:00:00Z", "rating": 6.3, "plot": "A washed up pitcher flashes through his career.", "rank": 4987, "running_time_secs": 8220, "actors": [ "Kevin Costner", "Kelly Preston", "John C. Reilly" ] } } """ def __init__(self, dyn_resource): """ :param dyn_resource: A Boto3 DynamoDB resource. """ self.dyn_resource = dyn_resource # The table variable is set during the scenario in the call to # 'exists' if the table exists. Otherwise, it is set by 'create_table'. self.table = None def exists(self, table_name): """ Determines whether a table exists. As a side effect, stores the table in a member variable. :param table_name: The name of the table to check. :return: True when the table exists; otherwise, False. """ try: table = self.dyn_resource.Table(table_name) table.load() exists = True except ClientError as err: if err.response["Error"]["Code"] == "ResourceNotFoundException": exists = False else: logger.error( "Couldn't check for existence of %s. Here's why: %s: %s", table_name, err.response["Error"]["Code"], err.response["Error"]["Message"], ) raise else: self.table = table return exists
Ruby
SDKuntuk Ruby
catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS.

# Encapsulates an Amazon DynamoDB table of movie data. class Scaffold attr_reader :dynamo_resource, :table_name, :table def initialize(table_name) client = Aws::DynamoDB::Client.new(region: 'us-east-1') @dynamo_resource = Aws::DynamoDB::Resource.new(client: client) @table_name = table_name @table = nil @logger = Logger.new($stdout) @logger.level = Logger::DEBUG end # Determines whether a table exists. As a side effect, stores the table in # a member variable. # # @param table_name [String] The name of the table to check. # @return [Boolean] True when the table exists; otherwise, False. def exists?(table_name) @dynamo_resource.client.describe_table(table_name: table_name) @logger.debug("Table #{table_name} exists") rescue Aws::DynamoDB::Errors::ResourceNotFoundException @logger.debug("Table #{table_name} doesn't exist") false rescue Aws::DynamoDB::Errors::ServiceError => e puts("Couldn't check for existence of #{table_name}:\n") puts("\t#{e.code}: #{e.message}") raise end
  • Untuk API detailnya, lihat DescribeTabledi AWS SDK for Ruby APIReferensi.

SAP ABAP
SDKuntuk SAP ABAP
catatan

Ada lebih banyak tentang GitHub. Temukan contoh lengkapnya dan pelajari cara pengaturan dan menjalankannya di Repositori Contoh Kode AWS.

TRY. oo_result = lo_dyn->describetable( iv_tablename = iv_table_name ). DATA(lv_tablename) = oo_result->get_table( )->ask_tablename( ). DATA(lv_tablearn) = oo_result->get_table( )->ask_tablearn( ). DATA(lv_tablestatus) = oo_result->get_table( )->ask_tablestatus( ). DATA(lv_itemcount) = oo_result->get_table( )->ask_itemcount( ). MESSAGE 'The table name is ' && lv_tablename && '. The table ARN is ' && lv_tablearn && '. The tablestatus is ' && lv_tablestatus && '. Item count is ' && lv_itemcount TYPE 'I'. CATCH /aws1/cx_dynresourcenotfoundex. MESSAGE 'The table ' && lv_tablename && ' does not exist' TYPE 'E'. ENDTRY.