How to use Redis and Elixir to implement simple key-value storage function

How to use Redis and Elixir to implement simple key-value storage function

Introduction:
Redis is a high-performance key-value storage system, and Elixir is a Functional programming language based on the Erlang virtual machine. Combining Redis and Elixir can implement a simple yet powerful key-value storage system. This article will introduce how to use Redis and Elixir to implement a simple key-value storage function and provide specific code examples.

Step 1: Install Redis and Elixir
First you need to install Redis and Elixir. You can obtain the latest version of the installation package through the Redis official website and Elixir official website, and install it according to the official documentation.

Step 2: Connect to Redis
To use Redis in Elixir, you need to use the redis library. You can introduce the redis library by adding the following dependencies in the mix.exs file:

defp deps do
  [
    {:redis, "~> 1.0"}
  ]
end

and then run the mix deps.get command to download the redis library.

Step 3: Implement key-value storage function
Create a new Elixir module, such as KeyStorage, to provide key-value storage function. The following is a simple example:

defmodule KeyStorage do
  alias Redis, as: R

  @redis_host "localhost"
  @redis_port 6379
  @redis_db 0

  def start_link do
    {:ok, pid} = R.start_link(@redis_host, @redis_port)
    R.select(pid, @redis_db)
    {:ok, pid}
  end

  def set(key, value) do
    R.set(key, value)
  end

  def get(key) do
    R.get(key)
  end

  def delete(key) do
    R.del(key)
  end
end

The above code uses the Redis.start_link function to connect to Redis, and defines set, get, and delete functions to implement key-value storage operations.

Step 4: Use the key-value storage function
You can use the KeyStorage module in other Elixir modules for key-value storage. The following is a simple example:

defmodule MyApp do
  def start do
    {:ok, pid} = KeyStorage.start_link()
    KeyStorage.set("name", "John")
    value = KeyStorage.get("name")
    IO.inspect(value)
    KeyStorage.delete("name")
  end
end

The above code first starts the KeyStorage module and saves the key "name" and the value "John" to Redis through the set function. Then get the value corresponding to the key "name" through the get function, and use the IO.inspect function to print the value. Finally, use the delete function to delete the key "name" and its corresponding value.

Summary:
The combination of Redis and Elixir can implement a simple and powerful key-value storage system. Using Redis as the underlying storage and using modules written by Elixir to encapsulate key-value storage operations can facilitate data storage and access. The above is a simple example, readers can expand and optimize the code according to actual needs.

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