Working With Redis in NodeJSTutorial Savvy

Redis is the open source in-memory data structure store used as caching in applications.
In this demo:-

We will learn to install and use Redis in Windows platform
Redis can be installed using npm install redis –save command. The following screenshot shows the terminal with Redis installation.

The updated project structure for RedisDemo will look like following screenshot.

We need to install a redis server but it does not support windows officially.The unofficial Redis for windows platform Redis-x64-3.0.500.msi.

https://github.com/MSOpenTech/redis/releases

The 1st window screen for redis-server installation is looks like following screenshot:-

The following windows asks for port name where server will run in the machine.The default port is 6379 for the redis server.

The following screenshot asks for the memory size that redis server takes.The default value is 512 MB.

The following screenshot shows the success message of redis installation.

After successful installation in windows 8.1 we can now start the redis-server service by using redis-server –service-start command in command prompt.The following screenshot shows the command prompt with redis-server start command in execution.

The redis-server process can be stopped using redis-server –service-stop command .The following screenshot shows the command prompt with redis-server stop command in execution.

The demo.js file contains the following code to create a Redis client and save the studentScore array.Also it contains the code to retrieve the redis object using key.The following code shows the content of demo.js file:-

var redis = require("redis"),
    client = redis.createClient(),
    studentScores = [
        {name: 'Sandeep', subject: 'Computer', score: 75, roll: 'roll2'},
        {name: 'John', subject: 'Mathematics', score: 175, roll: 'roll3'},
        {name: 'Kelly', subject: 'computer', score: 55, roll: 'roll4'},
        {name: 'Smith', subject: 'Mathematics', score: 35, roll: 'roll1'}
    ];
//save the object as key-value pair
//roll will be key and value will be stringified of student object
studentScores.forEach(function(aStudent, i){
    client.set(aStudent.roll, JSON.stringify(aStudent), redis.print);
});
//get the object for roll1 and parse it to JSON and display properties
client.get('roll1', function (err,result) {
    var aStudent = JSON.parse(result)
    console.log("Typeof: "+typeof aStudent);
    console.log("Name: "+aStudent.name);
    console.log("Subject: "+aStudent.subject);
    client.quit();
});
client.on('error', function (err) {
    console.log('error event - ', err);
});