public boolean deleteAllItems(String tableName) throws DataAccessException {
ScanRequest request = new ScanRequest().withTableName(tableName);
boolean deleted = false;
ScanResult result = ddb.scan(request);
for (Map<String, AttributeValue> item : result.getItems()) {
Key key = DynamoDBUtil.getIdKey(item);
deleteItem(tableName, key);
deleted = true;
}
// keep repeating until we get through all matched items
Key lastKeyEvaluated = null;
do {
lastKeyEvaluated = result.getLastEvaluatedKey();
if (lastKeyEvaluated != null) {
request = new ScanRequest(tableName).withExclusiveStartKey(lastKeyEvaluated);
result = ddb.scan(request);
for (Map<String, AttributeValue> item : result.getItems()) {
Key key = DynamoDBUtil.getIdKey(item);
deleteItem(tableName, key);
deleted = true;
}
}
} while (lastKeyEvaluated != null);
return deleted;
}
