如何使用适用于 Java 的 AWS 开发工具包 v2 扫描 dynamodb?

Question

如何使用适用于 Java 的 AWS 新开发工具包 v2 执行扫描？那里的文档很少。

Answer 1

由于 v2 sdk 非常新，因此文档对此很少，所以我不得不深入研究 API，并真正了解如何使用 v2 sdk 进行简单的扫描 + 分页。这是对我有用的代码示例。调味。

int count = 0;
DynamoDbClient ddb = DynamoDbClient.create();
ScanRequest request = ScanRequest.builder().tableName("Artists").limit(100).build();
ScanIterable scanResponses = ddb.scanPaginator(request);
List < Map < String, AttributeValue >> items;
Iterator < Map < String, AttributeValue >> map_it;
Map < String, AttributeValue > currentmap = null;
Set < String > mapKeys;
Iterator < String > keys_it;
String currentkey;
for (software.amazon.awssdk.services.dynamodb.model.ScanResponse response: scanResponses) {
count += response.count();
items = response.items();
map_it = items.iterator();
while (map_it.hasNext()) {
currentmap = map_it.next();
mapKeys = currentmap.keySet();
keys_it = mapKeys.iterator();
while (keys_it.hasNext()) {
currentkey = keys_it.next();
if (currentkey.equals("id")) // my results will have a "number" type id
System.out.println(currentkey + "=" + currentmap.get(currentkey).n());
else                         // the rest are strings
System.out.println(currentkey + "=" + currentmap.get(currentkey).s());
}
}
}
System.out.println("count=" + count);

结果像：

id=252593
object={some: "objectstring"}
artistDiscogs=Joan Jett
coverImage=https://img.discogs.com/CxmwMYC3XxF7CJdpKwCnpQUZEaE=/600x776/smart/filters:strip_icc():format(jpeg):mode_rgb():quality(90)/discogs-images/A-283542-1430342671-6179.jpeg.jpg
name=joan jett