Roy Tutorials

I am going to show you how to convert video (MP4/AVI) clips to gif in Python programming language. Recently I was trying online to convert an avi format video file to gif and I found that there are some limitations: you cannot upload more than 50 or 100 MB file; you need to register or login to the web site…

Here I am going to explain how to use AJAX with CodeIgniter 4 and MySQL to check the availability of username on key event. So instead of user waiting at the end of the input form and submitting the form, I am going to let user know immediately whether the username he/she is choosing is available or someone else has…

Here in this tutorial I am going to tell you how to configure Persistence Unit for JPA (Java Persistence API). Here I am going to show you both XML and Java based configurations for persistence unit in JPA. This is a pure Java application and I am not using Spring framework for this example. A persistence unit defines the details…

Here I am going to discuss how to display date time in different formats using Python programming language. Python datetime module supplies classes for manipulating dates and times. Date and time objects may be categorized as “aware” or “naive” depending on whether or not they include timezone information. An aware object, such as time zone and daylight saving time information,…

Here in this example I am going to show you how to allow users for OAuth2 SSO (Single Sign On) using AWS (Amazon Web Services) Cognito. I had explained how to do OAuth2 Single Sign On using Spring Boot and GitHub account. Here I am going to use AWS Cognito. You can use any other providers, such as, Google, Facebook,…

In this tutorial I will show you how to upload single and multiple files using PHP based CodeIgniter framework 4. In many enterprise applications files upload is an important task for various purposes. CodeIgniter makes working with files uploaded through a form much simpler and more secure than using PHP’s $_FILES array directly. This extends the File class and thus…

Past, Present Or Future’s Date In this example I am going to show you how to check if an input date is past date or today’s date or future date. For this example you should use at least Java version 8. Java 8 or higher version provides thread safe version of date time API classes that can be used safely…

This example will show you how to delete or eliminate duplicate records from a table in database. Keeping duplicate records in a table is unnecessary and it also grows the size of database unnecessary. Removing duplicate records from the table will free the occupied space and enhance also the performance of the query execution. Let’s say you have the following…

In this tutorial I am going to show you how to validate form in CodeIgniter 4 framework. CodeIgniter 4 is a PHP based web framework makes your life easier to build the web application quickly right from the scratch. CodeIgniter 4 is still under development and it is supposed to be supported with PHP version 7.2+. I will also tell…

In this example I am going to show you how to create and work with custom config file in CodeIgniter 4 framework. A PHP based CodeIgniter 4 framework is the new and future version of the CodeIgniter framework and currently version 4 is still under development. Config file is generally used to declare different configurations for your application. Configurations may…