Roy Tutorials

Here we are going to discuss about the StrongReference, PhantomReference, WeakReference and SoftReference. Reference classes are important in the context of how garbage collection works in Java memory model. Garbage collector reclaims memory from objects which are eligible for garbage collection and this eligibility is decided upon what kind if reference is pointing to the object – WeakReference or SoftReference…

Introduction This tutorial will show you how to disable or remove AMP gracefully from your WordPress site or blog. AMP is an acronym and stands for Accelerated Mobile Page. AMP is an initiative to create web pages that load quickly on the mobile devices. It consists of a modified version of HTML called AMP HTML, a JavaScript library called AMP…

Introduction In this tutorial, I will show you how to delete multiple rows from HTML table as well as from database server at one go. You might have seen tutorial how to display data from server to client side and how to select multiple rows on HTML table. I will put checkbox against each row on the table so that…

Introduction Here I will create an example on how to check/uncheck individual/all checkbox on HTML table rows. You might have seen how to display data from server using Angular and alternate row color using CSS. I will put checkbox against each row on the table so that user will be able to select a particular row. I will also put…

Introduction In this tutorial I am going to show you how to display data from server using Angular 9 and how to apply two different colors on alternate rows using css (cascading style sheet). I will use Spring Boot REST API to send data on client side and consume using client side technology Angular 9. I will use ngIf, else,…

Introduction In this tutorial we will see how to delete multiple rows from table using PHP, MySQL, AJAX, jQuery. We are going to delete rows from HTML as well as MySQL database table. We will use IN clause with WHERE condition in MySQL query to delete multiple rows from database table. We will put checkbox against each row on the table so that user…

Introduction In this example you will see how to work with IN clause with WHERE condition in SQL statement in Spring Data JPA. I will use MySQL server for this example. I will fetch selected rows or multiple rows selection as well as I will delete selected rows or multiple rows deletion from the table using IN operator with WHERE…

In this tutorial we build an application using Python based Flask framework to fetch all products from MySQL database and display on the HTML table. This example is all about to delete multiple rows from HTML as well as database tables. We will use IN clause with WHERE condition in MySQL query to delete multiple rows from database table. We…

Introduction We will see how to implement circuit breaker pattern using Hystrix in Spring Cloud Gateway. Hystrix is a library from Netflix that implements the circuit breaker pattern. The Hystrix GatewayFilter allows us to introduce circuit breakers to our gateway routes, protecting our services from cascading failures and allowing us to provide fallback responses in the event of downstream failures….

Introduction Here we will see how to use load balancer name or service name for Microservices instead of host, port for URI while building API gateway using Spring Cloud Gateway – the tutorial example which we have created earlier. We will use the same tutorial to use load balancer name instead of URL, such as, http://localhost:9000, http://localhost:9001, etc. for the…