How to query list of maps in dynamodb?

by jasen_gottlieb , in category: MySQL , a month ago

How to query list of maps in dynamodb?

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1 answer

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by addison , a month ago

@jasen_gottlieb 

To query a list of maps in DynamoDB, you can use the Query operation with a filter expression that specifies the condition you want to filter the results by.


Here is an example of how you can query a list of maps in DynamoDB using the AWS SDK for Java:

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AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().withRegion("us-west-2").build();

Map<String, AttributeValue> expressionAttributeValues = new HashMap<>();
expressionAttributeValues.put(":value", new AttributeValue().withN("1"));

Map<String, AttributeValue> exclusiveStartKey = null;
do {
    QueryRequest queryRequest = new QueryRequest()
        .withTableName("yourTableName")
        .withKeyConditionExpression("yourPartitionKey = :value")
        .withExpressionAttributeValues(expressionAttributeValues)
        .withExclusiveStartKey(exclusiveStartKey);

    QueryResult result = client.query(queryRequest);

    exclusiveStartKey = result.getLastEvaluatedKey();

    for (Map<String, AttributeValue> item : result.getItems()) {
        // process each item in the result set
    }
} while (exclusiveStartKey != null);


In this example, you need to replace "yourTableName", "yourPartitionKey", and ":value" with the actual table name, partition key, and filter expression values that you want to use in your query. You can customize the filter expression and the query parameters based on your specific requirements.