One way to reflect this change is to let the client perform an extra request to get the item list every time it makes a change in the database.
反映此更改的方法之一就是每次在数据库中进行更改时使客户机执行一个额外的请求，来获得项目列表。
This is the best way to follow a request through each of its stages.
这是跟踪请求所经历的各个阶段的最好方法。
This requires considerable application logic including a way to identify the request and the logic to generate and process the message.
这需要重要的应用逻辑，包括一种识别请求的方法以及生成并处理消息的逻辑。
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