扫描计数返回显着少于dynamodb表的数字(scan count returns significantly less number for a dynamodb table)

扫描计数返回显着少于dynamodb表的数字(scan count returns significantly less number for a dynamodb table)

我正在运行一个示例java程序来查询dynamodb表，该表有大约90000项，但是当我从java获得扫描计数时它只显示1994项

ScanRequest scanRequest = new ScanRequest().withTableName(tableName); ScanResult result = client.scan(scanRequest); System.out.println("#items:" + result.getScannedCount());

该程序输出#items：1994但来自amazon aws控制台的详细信息显示：

项目数*：89249

任何想法？ 谢谢

I'm running a sample java program to query a dynamodb table, the table has about 90000 items but when i get the scan count from java it shows only 1994 items

ScanRequest scanRequest = new ScanRequest().withTableName(tableName); ScanResult result = client.scan(scanRequest); System.out.println("#items:" + result.getScannedCount());

the program outputs #items:1994 but the detail from amazon aws console shows:

Item Count*: 89249

any idea? thanks

最满意答案

使用正确的哈希键值设置book对象，并使用DynamoDBMapper获取计数。

DynamoDBQueryExpression<Book> queryExpression = new DynamoDBQueryExpression<Book>() .withHashKeyValues(book); dynamoDbMapper.count(Book.class, queryExpression);

Set your book object with correct hash key value, and use DynamoDBMapper to get the count.

DynamoDBQueryExpression<Book> queryExpression = new DynamoDBQueryExpression<Book>() .withHashKeyValues(book); dynamoDbMapper.count(Book.class, queryExpression);