Roy Tutorials

I am going to show how to select a row from MySQL database as randomly as possible, but not repeating it. So I am going to select unique row from the MySQL database using PHP based Codeigniter framework. The original tutorial could be found as selecting a random row every day from MySQL.

I am going to show yo how to download PDF file from MySQL database using Spring Boot and iText library in Java programming language. Many applications require dynamic generation of PDF documents for reporting purpose, such as, generating statements for customers, readers buying online specific chapters of a book, etc. In my another tutorial I had shown how to create…

Here I am going to show you how to download excel file from MySQL using Spring framework. Generating excel report from MySQL database has few advantages over other file formats. Most of the people you are working with in your organization are familiar with excel file format, hence it needs a short learning curve. You may also like to read…

Dockerize NodeJs MySQL In this tutorial I am going to explain you how to use docker compose to dockerize your Nodejs MySQL REST API for CRUD operations. I am not going to tell you here how to build the REST CRUD application but you can always go back and check the detail tutorial on this here. I am only going…

NodeJS CRUD App Here I am going to show you how to create REST API CRUD example using Nodejs Express and MySQL server. CRUD means Create, Read, Update and Delete operations which are performed through REST (Representational State Transfer) resources that works on http/https protocol. REST resources or APIs work on verbs, such as, GET, POST, PUT, DELETE, etc. So…

Dockerize Spring Boot Microservices Here I am going to show you how to use docker compose for dockerizing Spring Boot Microservices MySQL app. Docker Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a YAML file to configure your application’s services. Then, with a single command, you create and start all the services from your…

Dockerize MySQL Flask App It is considered to be a best practice for a container to have only one process with single responsibility. But as I am going to dockerize Python based Flask web app and MySQL server for storing data for the app, so I need two containers – one for running the app and another one for running…

Introduction Here I am going to explain how to trace Spring Boot Microservices logs with Spring Cloud Sleuth and Zipkin Server. Spring Cloud Sleuth provides Spring Boot auto-configuration for distributed tracing. One of the problems most developers face difficulty of tracing logs as your microservices applications grow and requests propagate from one microservice to another microservice. So it could be…

Build and Package with Docker In this tutorial I am going to show you how to create a simple Python Flask REST API in Linux based CentOS 7 system. Then I am going to show you how to build, package and run this Python Flask application with Docker. Here I am creating an endpoint that returns Hello, World! in JSON…

Build And Package With Docker Here in this tutorial I am going to show you how to create a simple Spring Boot application. Then how to build, package and run this Spring Boot application with Docker in Linux environment (CentOS). I am going to use both gradle and maven as build tools for running build on this Spring Boot application….