@enablescan何时需要DynamoDB存储库中？
创建DynamoDB存储库时，默认情况下是否需要ENABLESCAN注释？什么是功能？
@EnableScan
public interface DynamoRepository extends CrudRepository<Data, String> {
}
When creating a DynamoDB repository, is the EnableScan annotation required by default? What is it's functionality?
@EnableScan
public interface DynamoRepository extends CrudRepository<Data, String> {
}
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简短的答案是否。仅当您想使用不是分区密钥的属性查询表时，才需要它。
例如：
假设您有一张名为“员工”的桌子，将分区密钥作为员工ID。您还具有诸如FirstName和LastName之类的属性。
在这种情况下，当您使用
FindbyId（雇员）时，您不需要@enablescan。但是，当您使用FindbyFirstName（“ John”）时，您需要@enablescan您可能已经注意到DynamoDB UI中可用的扫描功能。
@enablescan与快照中显示的扫描功能相似。同样，您不需要
@enablescan使用其分区键查询索引时。The short answer is No. You don't need
@EnableScanall the time. You need it only if you want to query the table with an attribute that's not a partition key.For Example:
Let's say you have a Table called Employee with Partition Key as employee id. You also have attributes like firstName and lastName.
In this case when you use
findById(employeeId)you don't need@EnableScan. But when you usefindByFirstName("John")then you need@EnableScanYou might have noticed the scan feature that's available in DynamoDB UI.
@EnableScanis similar to the scan feature shown in the snapshot.Likewise, you don't need
@EnableScanwhen you are querying an index with its partition Key.