[英]How to fetch all items from dynamo db without scan in lambda function
[英]How to scan all items in dynamo db?
我有以下方法來掃描dynamo db表中的所有項目
async def scan_all(self, parse_item: Callable[[dict], dict], **kwargs) -> List[dict]:
response = await self._db.scan(**kwargs)
response_items = response.get('Items', [])
items = list(parse_item(item) for item in response_items)
last_evaluated_key = response.get('LastEvaluatedKey', None)
while last_evaluated_key is not None:
response = await self._db.scan(ExclusiveStartKey=last_evaluated_key, **kwargs)
response_items = response.get('Items', [])
items.extend(parse_item(item) for item in response_items)
last_evaluated_key = response.get('LastEvaluatedKey', None)
return items
是正確的方法還是我可以改善它? 使用LastEvaluatedKey
的最佳實踐是什么?
好吧,我不確定這是不是更好,但這就是我的做法(閱讀dynamodb文檔):
Map<String, AttributeValue> lastKeyEvaluated = null;
do {
ScanRequest scanRequest = new ScanRequest().withTableName(TABLE_NAME)
.withExclusiveStartKey(lastKeyEvaluated);
ScanResult result = client.scan(scanRequest);
for (Map<String, AttributeValue> item : result.getItems()) {
}
}while(lastKeyEvaluated != null);
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