Example usage for com.amazonaws.services.dynamodbv2.model QueryRequest QueryRequest

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.model QueryRequest QueryRequest.

Prototype

public QueryRequest(String tableName) 

Source Link

Document

Constructs a new QueryRequest object.

Usage

From source file:awslabs.lab51.SolutionCode.java

License:Open Source License

@Override
public Boolean isImageInDynamo(AmazonDynamoDBClient dynamoDbClient, String tableName, String key) {
    QueryRequest queryRequest = new QueryRequest(tableName).withConsistentRead(true);
    queryRequest.addKeyConditionsEntry("Key",
            new Condition().withComparisonOperator("EQ").withAttributeValueList(new AttributeValue(key)));

    return (dynamoDbClient.query(queryRequest).getCount() > 0);
}

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From source file:com.vivastream.dynamodb.core.DynamoDBTemplate.java

License:Apache License

public <T> List<T> query(String tableName, String indexName, Map<String, Condition> keyConditions,
        final ObjectExtractor<T> extractor, String... columnsToInclude) throws EmptyResultDataAccessException {
    Assert.notNull(tableName, "Table must not be null");
    Assert.notNull(extractor, "ObjectExtractor must not be null");
    if (logger.isDebugEnabled()) {
        logger.debug("Executing query on " + tableName + " for " + renderKey(keyConditions));
    }/*from  ww w . ja  v a 2s.c o m*/

    QueryRequest request = new QueryRequest(tableName) //
            .withConsistentRead(false) // because query is used on GSIs [where consistent reads are not supported] - if we needed to query on the primary index could make this a parameter
            .withKeyConditions(keyConditions);

    if (columnsToInclude != null && columnsToInclude.length > 0) {
        request.setAttributesToGet(Arrays.asList(columnsToInclude));
    }

    if (indexName != null) {
        request.setIndexName(indexName);
    }

    QueryResult result = client.query(request);

    List<Map<String, AttributeValue>> items = result.getItems();
    List<T> convertedItems = new ArrayList<T>(items.size());
    for (Map<String, AttributeValue> item : items) {
        convertedItems.add(extractor.extract(item));
    }

    return convertedItems;
}

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From source file:org.iternine.jeppetto.dao.dynamodb.DynamoDBQueryModelDAO.java

License:Apache License

private Iterable<T> queryItems(QueryModel queryModel, ConditionExpressionBuilder conditionExpressionBuilder) {
    QueryRequest queryRequest = new QueryRequest(tableName);

    queryRequest.setKeyConditions(conditionExpressionBuilder.getKeyConditions());
    queryRequest.setConsistentRead(consistentRead);

    if (queryModel.getFirstResult() > 0) {
        logger.warn(//from   w w  w  . j  a va 2  s  . c  o  m
                "DynamoDB does not support skipping results.  Call setPosition() on DynamoDBIterable instead.");
    }

    if (queryModel.getMaxResults() > 0) {
        queryRequest.setLimit(queryModel.getMaxResults());
    }

    List<String> keyFields = applyIndexAndGetKeyFields(conditionExpressionBuilder, queryRequest,
            queryModel.getSorts());
    applyExpressions(conditionExpressionBuilder, queryRequest);

    return new QueryIterable<T>(dynamoDB, persistableEnhancer, queryRequest, keyFields.get(0), keyFields);
}

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