March 2018
Beginner to intermediate
308 pages
8h 23m
English
Content preview from Seven NoSQL Databases in a Week
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Lua
Earlier in this chapter, server-side Lua scripting was identified as a feature of Redis. This feature allows you to[2] create scripted extensions to the Redis database. In this section, we'll explore this functionality along with some short and simple scripts.
Let's start by expanding on our hello world example and write a short script to query that message. Lua code can be invoked with the EVAL command from the redis-cli:
127.0.0.1:6379> EVAL 'local text="Hello world!" return text' 0 "Hello world!"
The zero 0 on the end of the EVAL command tells Redis that we are not passing any keys to be used by Lua (more on that in a moment).
Lua scripts can invoke commands typically used in the redis-cli. This can be done with the redis.call()
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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.