JSF 2中的范围 [英] Scopes in JSF 2

问题描述

我有一个CRUD应用程序.在其中获取数据的位置，显示n个已编辑的n存储回db.页面和页面之间也有顺序访问.在第二页&上需要在第一页上输入的信息.以此类推.最佳范围是什么?为什么 ?

I have a CRUD application.. Where in the data is fetched, displayed n edited n stored back to db. Also there is a sequential access between pages & the information entered on the first page is needed on the second page & so forth. What would be the best scope & why ?

什么时候使用哪个范围?每个范围的生命周期是什么?

When to use which scope? What is the life-cycle of each scope.

此外，我找不到有关示波器的任何优秀教程.如果您知道相同的内容，请进行指导.

Also, I couldn't find any good tutorial on scopes. If you are aware of the same, please guide.

谢谢， 什卡(Shikha)

Thanks, Shikha

推荐答案

BalusC出色的教程

There is a detailed explanation of JSF scopes in BalusC's excellent tutorial Communication in JSF 2.0.

根据经验，我建议始终选择最窄的范围，以减少保存在服务器端的状态.如果将所有内容都保留在会话范围内，则应用程序的伸缩性将很差.如果您使用的是Ajax，则视图范围特别有用.对于非ajax视图，请求范围通常就足够了.

As rule of thumb I would recommend to always choose the most narrow scope in order to reduce the state that is saved on the server side. Your application would have a bad scalability if you kept everything in session scope. The view scope is especially useful if you are working with ajax. For non-ajax views the request scope is often sufficient.

这篇关于JSF 2中的范围的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！