Writing dynamoDB "OR" condition query?

Question

I want to query the dynamodb table with boolean or condition like SQL e.g. Get me all the items where attribute1 = "no" or attribute2="no"

I tried with scanRequest.withScanFilter but all the conditions are performed by doing boolean ANDing. How do I do boolean ORing.?

Answer 1

You can set ConditionalOperator of your ScanRequest to "OR". The default value is "AND"

http://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Scan.html

ScanRequest scanRequest = new ScanRequest("tableName");
scanRequest.setConditionalOperator(ConditionalOperator.OR);

Map<String, Condition> scanFilter = new HashMap<String, Condition>();
scanFilter.put("attribute1", new Condition().withAttributeValueList(new AttributeValue("no")).withComparisonOperator(ComparisonOperator.EQ));
scanFilter.put("attribute2", new Condition().withAttributeValueList(new AttributeValue("no")).withComparisonOperator(ComparisonOperator.EQ));

scanRequest.setScanFilter(scanFilter);
ScanResult scanResult = dynamo.scan(scanRequest);

for(Map<String, AttributeValue> item : scanResult.getItems()) {
    System.out.println(item);
}