November 2013
Intermediate to advanced
148 pages
3h 12m
English
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Querying Data with Mapreduce Views
Different databases offer different ways of querying data, but most include some concept of indexing. When you index data in a database, you make it available for quick retrieval by some field or attribute of the data.
With CouchDB, you write mapreduce functions, which produce views. A view is a kind of index that maps values back to documents. With a view, you can query for documents with particular attributes or fields—like finding a book by its author.
We’ll create two views for our Gutenberg data set: one for finding books by author, and one for finding books on a given subject. Since CouchDB views consist of JavaScript code, we’ll keep them in a Node.js module and write a small utility program for loading ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.