问题描述
我需要在最大计数为 10 的 jsp 上显示搜索结果，并且它应该有一个分页来作为分页功能来回遍历.
I have a requirement for to show the search result on the jsp with maxcount of 10 and it should have a pagination to traverse back and forward as pagination functionality.
Dynamodb 有一个 lastevaluatedKey，但返回上一页无济于事，尽管我可以通过 lastevaluatedKey 转到下一个结果集.
Dynamodb has a lastevaluatedkey, but it doesn't help to go back to the previous page, though I can move to the next result set by the lastevaluatedKey.
有人可以帮忙吗?
我使用 Java SPRING 和 DynamoDB 作为堆栈.
I am using Java SPRING and DynamoDB as the stack.
谢谢萨提亚
推荐答案
要启用前进/后退，你只需要保持
To enable forward/backward, all you need is to keep
第一个键，即之前返回页面的第一条记录的hash key + sort key(如果要查询第一页则为null).
the first key, which is hash key + sort key of the first record of the previously returned page (null if you are about to query the first page).
和
最后一个key检索到的页面，也就是之前返回页面最后一条记录的hash key + sort key
the last key of the retrieved page, which is hash key + sort key of the last record of the previously returned page
然后要向前或向后导航，您需要在查询请求中传入以下参数:
Then to navigate forward or backward, you need to pass in below parameters in the query request:
Forward:最后一个key为ExclusiveStartKey，order=ascend
Backward:第一个key为ExclusiveStartKey，order = descend
我在 2016 年的一个项目中实现了这一点.DynamoDB 现在可能会提供一些类似的方便 API，但我不确定，因为我很长时间没有检查过 DynamoDB.
I have achieved this in a project in 2016. DynamoDB might provide some similar convenient APIs now, but I'm not sure as I haven't checked DynamoDB for a long time.
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