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

Introduction

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

private void applyExpressions(ConditionExpressionBuilder conditionExpressionBuilder,
        QueryRequest queryRequest) {
    Map<String, String> expressionAttributeNames;

    queryRequest.setProjectionExpression(projectionExpression);

    if (conditionExpressionBuilder.hasExpression()) {
        queryRequest.setFilterExpression(conditionExpressionBuilder.getExpression());

        if (!conditionExpressionBuilder.getExpressionAttributeValues().isEmpty()) {
            queryRequest// w  w  w.j  av  a2s  . c  o  m
                    .setExpressionAttributeValues(conditionExpressionBuilder.getExpressionAttributeValues());
        }

        if (projectionExpressionNames.isEmpty()) {
            expressionAttributeNames = conditionExpressionBuilder.getExpressionAttributeNames();
        } else if (conditionExpressionBuilder.getExpressionAttributeNames().isEmpty()) {
            expressionAttributeNames = projectionExpressionNames;
        } else {
            expressionAttributeNames = new LinkedHashMap<String, String>();
            expressionAttributeNames.putAll(conditionExpressionBuilder.getExpressionAttributeNames());
            expressionAttributeNames.putAll(projectionExpressionNames);
        }
    } else {
        expressionAttributeNames = projectionExpressionNames;
    }

    if (!expressionAttributeNames.isEmpty()) {
        queryRequest.setExpressionAttributeNames(expressionAttributeNames);
    }
}

---