How can multiple items in AWS DynamoDB be obtained by using both a String and range in Java?

edit

To perform a query operation in DynamoDB to retrieve multiple items using both a String and range, you can use the following code in Java:

AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().build();

String tableName = "YourTableName";
String partitionKey = "YourPartitionKey";
String partitionValue = "YourPartitionValue";
String sortKey = "YourSortKey";
String filterExpression = "Attribute_name >= :val1 AND Attribute_name <= :val2";

Map<String, AttributeValue> expressionAttributeValues = new HashMap<String, AttributeValue>();
expressionAttributeValues.put(":val1", new AttributeValue().withS("YourRangeStart"));
expressionAttributeValues.put(":val2", new AttributeValue().withS("YourRangeEnd"));

QueryRequest queryRequest = new QueryRequest().withTableName(tableName)
    .withKeyConditionExpression(partitionKey + " = :partitionValue AND " + sortKey + " BETWEEN :sortValueStart AND :sortValueEnd")
    .withFilterExpression(filterExpression)
    .withExpressionAttributeValues(expressionAttributeValues);

queryRequest.getFilterExpression();
QueryResult queryResult = client.query(queryRequest);
List<Map<String, AttributeValue>> items = queryResult.getItems();

Note: Replace "YourTableName", "YourPartitionKey", "YourPartitionValue", "YourSortKey", "Attribute_name", "YourRangeStart", and "YourRangeEnd" with your actual values.

In this code, we first create an AmazonDynamoDB client object and define the table name, partition key, partition value, sort key, and filter expression. We then create a map of expression attribute values containing the range values.

Next, we create a QueryRequest object, set the table name, key condition expression, filter expression, and expression attribute values.

Finally, we execute the query by calling the query method on the client object, and retrieve the items using the getItems method of the QueryResult object.

This code will retrieve all items in the specified range for the given partition key and sort key.