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Memperbarui item DynamoDB dengan menggunakan TTL AWS SDK
Contoh kode berikut menunjukkan cara memperbarui itemTTL.
- Java
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- SDKuntuk Java 2.x
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Update TTL pada item DynamoDB yang ada dalam tabel.
import software.amazon.awssdk.regions.Region; import software.amazon.awssdk.services.dynamodb.DynamoDbClient; import software.amazon.awssdk.services.dynamodb.model.AttributeValue; import software.amazon.awssdk.services.dynamodb.model.DynamoDbException; import software.amazon.awssdk.services.dynamodb.model.ResourceNotFoundException; import software.amazon.awssdk.services.dynamodb.model.UpdateItemRequest; import software.amazon.awssdk.services.dynamodb.model.UpdateItemResponse; import software.amazon.awssdk.utils.ImmutableMap; import java.util.Map; import java.util.Optional; // Get current time in epoch second format final long currentTime = System.currentTimeMillis() / 1000; // Calculate expiration time 90 days from now in epoch second format final long expireDate = currentTime + (90 * 24 * 60 * 60); // An expression that defines one or more attributes to be updated, the action to be performed on them, and new values for them. final String updateExpression = "SET updatedAt=:c, expireAt=:e"; final ImmutableMap<String, AttributeValue> keyMap = ImmutableMap.of("primaryKey", AttributeValue.fromS(primaryKey), "sortKey", AttributeValue.fromS(sortKey)); final Map<String, AttributeValue> expressionAttributeValues = ImmutableMap.of( ":c", AttributeValue.builder().s(String.valueOf(currentTime)).build(), ":e", AttributeValue.builder().s(String.valueOf(expireDate)).build() ); final UpdateItemRequest request = UpdateItemRequest.builder() .tableName(tableName) .key(keyMap) .updateExpression(updateExpression) .expressionAttributeValues(expressionAttributeValues) .build(); try (DynamoDbClient ddb = DynamoDbClient.builder() .region(region) .build()) { final UpdateItemResponse response = ddb.updateItem(request); System.out.println(tableName + " UpdateItem operation with TTL successful. Request id is " + response.responseMetadata().requestId()); } catch (ResourceNotFoundException e) { System.err.format("Error: The Amazon DynamoDB table \"%s\" can't be found.\n", tableName); System.exit(1); } catch (DynamoDbException e) { System.err.println(e.getMessage()); System.exit(1); } System.exit(0);
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Untuk API detailnya, lihat UpdateItemdi AWS SDK for Java 2.x APIReferensi.
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- JavaScript
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- SDKuntuk JavaScript (v3)
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. // SPDX-License-Identifier: Apache-2.0 import { DynamoDBClient, UpdateItemCommand } from "@aws-sdk/client-dynamodb"; import { marshall, unmarshall } from "@aws-sdk/util-dynamodb"; async function updateDynamoDBItem(tableName, region, partitionKey, sortKey) { const client = new DynamoDBClient({ region: region, endpoint: `https://dynamodb.${region}.amazonaws.com` }); const currentTime = Math.floor(Date.now() / 1000); const expireAt = Math.floor((Date.now() + 90 * 24 * 60 * 60 * 1000) / 1000); const params = { TableName: tableName, Key: marshall({ partitionKey: partitionKey, sortKey: sortKey }), UpdateExpression: "SET updatedAt = :c, expireAt = :e", ExpressionAttributeValues: marshall({ ":c": currentTime, ":e": expireAt }), }; try { const data = await client.send(new UpdateItemCommand(params)); const responseData = unmarshall(data.Attributes); console.log("Item updated successfully: %s", responseData); return responseData; } catch (err) { console.error("Error updating item:", err); throw err; } } //enter your values here updateDynamoDBItem('your-table-name', 'us-east-1', 'your-partition-key-value', 'your-sort-key-value');
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Untuk API detailnya, lihat UpdateItemdi AWS SDK for JavaScript APIReferensi.
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- Python
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- SDKuntuk Python (Boto3)
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# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. # SPDX-License-Identifier: Apache-2.0 import boto3 from datetime import datetime, timedelta def update_dynamodb_item(table_name, region, primary_key, sort_key): """ Update an existing DynamoDB item with a TTL. :param table_name: Name of the DynamoDB table :param region: AWS Region of the table - example `us-east-1` :param primary_key: one attribute known as the partition key. :param sort_key: Also known as a range attribute. :return: Void (nothing) """ try: # Create the DynamoDB resource. dynamodb = boto3.resource('dynamodb', region_name=region) table = dynamodb.Table(table_name) # Get the current time in epoch second format current_time = int(datetime.now().timestamp()) # Calculate the expireAt time (90 days from now) in epoch second format expire_at = int((datetime.now() + timedelta(days=90)).timestamp()) table.update_item( Key={ 'partitionKey': primary_key, 'sortKey': sort_key }, UpdateExpression="set updatedAt=:c, expireAt=:e", ExpressionAttributeValues={ ':c': current_time, ':e': expire_at }, ) print("Item updated successfully.") except Exception as e: print(f"Error updating item: {e}") # Replace with your own values update_dynamodb_item('your-table-name', 'us-west-2', 'your-partition-key-value', 'your-sort-key-value')
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Untuk API detailnya, lihat UpdateItem AWSSDKReferensi Python (Boto3). API
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Untuk daftar lengkap panduan AWS SDK pengembang dan contoh kode, lihatMenggunakan DynamoDB dengan AWS SDK. Topik ini juga mencakup informasi tentang memulai dan detail tentang SDK versi sebelumnya.
Kueri untuk TTL item
Menggunakan model dokumen