1.2.1 Strings in Redis
In Redis, STRINGs are similar to strings that we see in other languages or other key-value stores. Generally, when I show diagrams that represent keys and values, the diagrams have the key name and the type of the value along the top of a box, with the value inside the box. I’ve labeled which part is which as an example in figure 1.1, which shows a STRING with key hello and value world.
The operations available to STRINGs start with what’s available in other key-value stores. We can GET values, SET values, and DEL values. After you have installed and tested Redis as described in appendix A, within redis-cli you can try to SET, GET, and DEL values in Redis, as shown in listing 1.1, with the basic meanings of the functions described in table 1.3.
What it does
Fetches the data stored at the given key
Sets the value stored at the given key
Deletes the value stored at the given key (works for all types)
Using Redis-CLI In this first chapter, I introduce Redis and some commands using the redis-cli interactive client that comes with Redis. This allows you to get started interacting with Redis quickly and easily.
In addition to being able to GET, SET, and DEL STRING values, there are a handful of other commands for reading and writing parts of STRINGs, and commands that allow us to treat strings as numbers to increment/decrement them. We’ll talk about many of those commands in chapter 3. But we still have a lot of ground to cover, so let’s move on to take a peek at LISTs and what we can do with them.