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

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.model GetItemRequest 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 T findById(ID id) throws NoSuchItemException, JeppettoException {
    GetItemResult result;/* w w w. j a  v a 2s.c o  m*/

    try {
        GetItemRequest getItemRequest = new GetItemRequest(tableName, getKeyFrom(id), consistentRead);

        getItemRequest.setProjectionExpression(projectionExpression);

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

        result = dynamoDB.getItem(getItemRequest);
    } catch (AmazonClientException e) {
        throw new JeppettoException(e);
    }

    if (result.getItem() == null) {
        throw new NoSuchItemException(entityClass.getSimpleName(), id.toString());
    }

    T t = ConversionUtil.getObjectFromItem(result.getItem(), entityClass);

    ((DynamoDBPersistable) t).__markPersisted(dynamoDB.toString());

    return t;
}

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