couchdb - CouchDB 中的过滤和更新功能？

Question

这些功能是什么？

我在哪里可以阅读有关它们如何工作的信息？

CouchDB 权威指南没有解释它，很奇怪。

Answer 1

来自 CouchDB 权威指南:

There are other design document functions that are being introduced at the time of this writing, including _update and _filter that we aren’t covering in depth here. Filter functions are covered in Chapter 20, Change Notifications. Imagine a web service that POSTs an XML blob at a URL of your choosing when particular events occur. PayPal’s instant payment notification is one of these. With an _update handler, you can POST these directly in CouchDB and it can parse the XML into a JSON document and save it. The same goes for CSV, multi-part form, or any other format.

有关来自 wiki 的更新的更多信息:

http://wiki.apache.org/couchdb/Document_Update_Handlers