Example usage for com.amazonaws.services.dynamodbv2.model KeysAndAttributes setProjectionExpression

Introduction

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

Prototype

public void setProjectionExpression(String projectionExpression) 

Source Link

Document

A string that identifies one or more attributes to retrieve from the table.

Usage

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

License:Apache License

@Override
public Iterable<T> findByIds(ID... ids) throws JeppettoException {
    Collection<Map<String, AttributeValue>> keys = new ArrayList<Map<String, AttributeValue>>();

    for (ID id : ids) {
        keys.add(getKeyFrom(id));/*  ww  w. j a va2 s. com*/
    }

    KeysAndAttributes keysAndAttributes = new KeysAndAttributes().withKeys(keys);

    keysAndAttributes.setConsistentRead(consistentRead);
    keysAndAttributes.setProjectionExpression(projectionExpression);

    if (!projectionExpressionNames.isEmpty()) {
        keysAndAttributes.setExpressionAttributeNames(projectionExpressionNames);
    }

    BatchGetItemRequest batchGetItemRequest = new BatchGetItemRequest()
            .withRequestItems(Collections.singletonMap(tableName, keysAndAttributes));

    return new BatchGetIterable<T>(dynamoDB, persistableEnhancer, batchGetItemRequest, tableName);
}

---