February 2017
Beginner to intermediate
1100 pages
25h 19m
English
book
Scala: Guide for Data Science Professionals
by Pascal Bugnion, Arun Manivannan, Patrick R. Nicolas
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Casbah query DSL
Using DBObject instances to express queries can be very verbose and somewhat difficult to read. Casbah provides a DSL to express queries much more succinctly. For instance, to get all the documents with the github_id field between 20 and 30, we would write the following:
scala> collection.find("github_id" $gte 20 $lt 30).toList List[com.mongodb.casbah.Imports.DBObject] = List({ "_id" : { "$oid" : "562e922546f953739c43df0f"} , "github_id" : 23 , "login" : "takeo" , "repos" : ...
The operators provided by the DSL will automatically construct DBObject instances. Using the DSL operators as much as possible generally leads to much more readable and maintainable code.
Going into the full details of the query DSL is beyond the scope of ...
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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.
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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.