Query a DynamoDB table for TTL items using an AWS SDK
The following code examples show how to query for TTL items.
- Java
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- SDK for Java 2.x
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Query Filtered Expression to gather TTL items in a DynamoDB table.
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.QueryRequest; import software.amazon.awssdk.services.dynamodb.model.QueryResponse; import software.amazon.awssdk.services.dynamodb.model.ResourceNotFoundException; import software.amazon.awssdk.utils.ImmutableMap; import java.util.Map; import java.util.Optional; // Get current time in epoch second format (comparing against expiry attribute) final long currentTime = System.currentTimeMillis() / 1000; // A string that contains conditions that DynamoDB applies after the Query operation, but before the data is returned to you. final String keyConditionExpression = "#pk = :pk"; // The condition that specifies the key values for items to be retrieved by the Query action. final String filterExpression = "#ea > :ea"; final Map<String, String> expressionAttributeNames = ImmutableMap.of( "#pk", "primaryKey", "#ea", "expireAt"); final Map<String, AttributeValue> expressionAttributeValues = ImmutableMap.of( ":pk", AttributeValue.builder().s(primaryKey).build(), ":ea", AttributeValue.builder().s(String.valueOf(currentTime)).build() ); final QueryRequest request = QueryRequest.builder() .tableName(tableName) .keyConditionExpression(keyConditionExpression) .filterExpression(filterExpression) .expressionAttributeNames(expressionAttributeNames) .expressionAttributeValues(expressionAttributeValues) .build(); try (DynamoDbClient ddb = DynamoDbClient.builder() .region(region) .build()) { final QueryResponse response = ddb.query(request); System.out.println(tableName + " Query operation with TTL successful. Request id is " + response.responseMetadata().requestId()); // Print the items that are not expired for (Map<String, AttributeValue> item : response.items()) { System.out.println(item.toString()); } } 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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For API details, see Query in AWS SDK for Java 2.x API Reference.
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- JavaScript
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- SDK for JavaScript (v3)
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import { DynamoDBClient, QueryCommand } from "@aws-sdk/client-dynamodb"; import { marshall, unmarshall } from "@aws-sdk/util-dynamodb"; async function queryDynamoDBItems(tableName, region, primaryKey) { const client = new DynamoDBClient({ region: region, endpoint: `https://dynamodb.${region}.amazonaws.com` }); const currentTime = Math.floor(Date.now() / 1000); const params = { TableName: tableName, KeyConditionExpression: "#pk = :pk", FilterExpression: "#ea > :ea", ExpressionAttributeNames: { "#pk": "primaryKey", "#ea": "expireAt" }, ExpressionAttributeValues: marshall({ ":pk": primaryKey, ":ea": currentTime }) }; try { const { Items } = await client.send(new QueryCommand(params)); Items.forEach(item => { console.log(unmarshall(item)) }); return Items; } catch (err) { console.error(`Error querying items: ${err}`); throw err; } } //enter your own values here queryDynamoDBItems('your-table-name', 'your-partition-key-value');
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For API details, see Query in AWS SDK for JavaScript API Reference.
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- Python
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- SDK for Python (Boto3)
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import boto3 from datetime import datetime def query_dynamodb_items(table_name, partition_key): """ :param table_name: Name of the DynamoDB table :param partition_key: :return: """ try: # Initialize a DynamoDB resource dynamodb = boto3.resource('dynamodb', region_name='us-east-1') # Specify your table table = dynamodb.Table(table_name) # Get the current time in epoch format current_time = int(datetime.now().timestamp()) # Perform the query operation with a filter expression to exclude expired items # response = table.query( # KeyConditionExpression=boto3.dynamodb.conditions.Key('partitionKey').eq(partition_key), # FilterExpression=boto3.dynamodb.conditions.Attr('expireAt').gt(current_time) # ) response = table.query( KeyConditionExpression=dynamodb.conditions.Key('partitionKey').eq(partition_key), FilterExpression=dynamodb.conditions.Attr('expireAt').gt(current_time) ) # Print the items that are not expired for item in response['Items']: print(item) except Exception as e: print(f"Error querying items: {e}") # Call the function with your values query_dynamodb_items('Music', 'your-partition-key-value')
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For API details, see Query in AWS SDK for Python (Boto3) API Reference.
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For a complete list of AWS SDK developer guides and code examples, see Using DynamoDB with an AWS SDK. This topic also includes information about getting started and details about previous SDK versions.