Here I am going to show you an example how to encrypt PDF to make it password protected using PyPDF2 module in Python programming language. I am not going to show you how to create a new PDF file in this example and I am going to read the existing PDF file and making this PDF file password protected. It is a good idea to make the PDF password protected when you want to send some sensitive data into the PDF file over the network, such as, email or you…
ContinueHow to watermark Image with Text using Python
Introduction In this tutorial I am going to show you an example on how to watermark image with text using Python. You might have seen somewhere online portal or social network portals that some images are watermarked, because the owners of the images want to prevent misuse of the images. Here I am going to show you how you can place the text watermark on different places, for example: right bottom, center, on top of the image. I will also show how to change the color of the watermarked text…
ContinueOnline Visitor Tracking System using CodeIgniter 4, MySQL 8 and AJAX
In this tutorial I am going to show you how you can build an online visitor tracking system using PHP based framework CodeIgniter 4, MySQL 8 and AJAX technique. The similar system for tracking online visitors on web site, I built in past, using CodeIgniter 3 framework. As a web site owner you would like to the progress to the count of your visitors, page views, etc. because, it gives you overall idea on the website’s analytical measurements. It will also give you how you can make improvements to your…
ContinueSELECT list is not in GROUP BY clause and contains nonaggregated column – mysqli_sql_exception #1055
You might encounter the following issue while executing an SQL query qith Group By clause in MySQL database server. Error Type: mysqli_sql_exception #1055 Error Details: Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column ‘roytuts.visitors.access_date’ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
ContinueSpring Batch – Scheduling Multiple Jobs Parallelly
In this example I am going to show you how to run multiple batch jobs parallelly in Spring Batch framework. Spring Batch is a lightweight, comprehensive batch framework designed to enable the development of robust batch applications vital for the daily operations of enterprise systems. Spring Batch provides reusable functions that are essential in processing large volumes of records, including logging/tracing, transaction management, job processing statistics, job restart, skip, and resource management. It also provides more advanced technical services and features that will enable extremely high-volume and high performance batch…
ContinueAdd Images to Word File using Python
Here I am going to show an example how you can add images to word file in Python programming language. Generally you write headings, paragraphs, etc. to describe an event or something in the word file. To explain better pictorially about the same thing you need to insert or add images. python-docx is a Python library for creating and updating Microsoft Word (.docx) files. I am going to use Python based python-docx module to insert images into the word (docx) file.
ContinueHow to deploy Spring Boot Data JPA Application to Heroku Cloud
In this tutorial I am going to show you an example on deploying Spring Boot application to Heroku cloud. I will create a basic CRUD application with Spring Boot Data JPA and PostgreSQL/MySQL technologies. I will first show you how to perform CRUD operations locally, then deploy the same application in the Heroku cloud with some modifications. CRUD is an acronym that stands for Create, Read, Update and Delete. I am building REST APIs using Spring Boot framework. I will use Postman tool to access and test the REST web…
ContinueHow to install PostgreSQL Zip Archive in Windows
In this example I will show you installing PostgreSQL zip archive in Windows environment. I will show you how to setup username and password for your PostgreSQL database server. I am also going to show you some basic commands for listing all database, switching to another database, creating a new database, showing all tables, creating a new table, database backup, database import. The advantage of installing zip version of the PostgreSQL is that your registry does not get modified and you do not need to restart your system (if required).…
ContinueDifference Between Parallel Stream and CompletableFuture in Java
I am going to discuss here CompletableFuture vs Parallel Stream in Java programming language. CompletableFuture extends Future with added advantage to allow the tasks finish in an ad hoc manner. In Parallel Stream task is divided into sub-tasks and run on separate threads to be completed faster. Both CompletableFuture and Parallel Stream were added in Java 8. I am not going to explain in details about CompletableFuture and Parallel Stream but you can always check the corresponding link to read details. But I am going to tell you in which…
ContinueHow to convert Video (MP4/AVI) Clips to GIF in Python
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 to convert your video file. And my requirement was not fulfilled. So I wrote this example. The source code which I am going to show you can be found in…
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