In a recent post to his blog Gonzalo Ayuso has a brief introduction to CouchDB and how you can use it in your application. Most of the post is made up of code samples showing some of the basic relational database operations translated over to a CouchDB database (found in this class).
I come from relational database world. NoSQL is new for me. Maybe I'm wrong but I want to use INSERT, UPDATE, DELETE and SELECT statements in CouchDB in the same way I use them in Relational database. The class is focused in the HTTP Document API. There is a great tutorial here that explains the API. Now I'll show the interface I've made to perform the statements with CouchDB.
There's examples of both simple and more complex selects, updates and deletes as well as the handling of exceptions via two types he's included support for - NoDataFound and DupValOnIndex.