In my opinion transaction management is a really important topic for each backend developer. In general, people don’t pay attention to it while using Spring framework.
But I think, it is important to know how to use transactions properly. Because sometimes can happen that there was an exception thrown inside your method, but transaction was not rolled back and it is not clear why? Or some other “strange” cases.
How can I easily test my MongoDB multi-document transaction code without setting up MongoDB on my device? One might argue that they have to set it up first because in order to carry out such a transaction it needs a session which requires a replica set. Thankfully, there is no need to create a 3-node replica set and we can run these transactions only against a single database instance.
I strain to make the far-off echo yield
A cue to the events that may come in my day.
(‘Doctor Zhivago’, Boris Pasternak)
I’ll be honest: I don’t write in pure C that often anymore and I haven’t been following the language’s development for a long time. However, two unexpected things happened recently: С won back the title of the most popular programming language according to TIOBE, and the first truly interesting book in years on this language was published. So, I decided to spend a few evenings studying material on C2x, the future version of C.
Here I will share with you what I consider to be its most interesting new features.
In the modern world, here and there ideas are arising about using data science for an extra benefit. For instance, Google can use a history of watched videos for providing recommendations about new ones. Online shops are using a recommendation system for increasing your receipt. However… if companies use the data for their benefit, could we do the same for own needs such as looking an online English teacher?
It is an approach based on my own experience and can be unsuitable to your point of view, ideas, or principles.
A linked list is a linear data structure, which contains node structure and each node contains two elements. A data part that stores the value at that node and next part that stores the link to the next node as shown in the below image:
The first node also known as HEAD is usually used to traverse through the linked list. The last node (next part of the last node) points to NULL. The list can be visualized as a chain of nodes, where every node points to the next node.
In PHP, singly linked list can be represented as a class and a Node as a separate class. The LinkedList class contains a reference of Node class type.
//node structure
class Node {
public $data;
public $next;
}
class LinkedList {
public $head;
//constructor to create an empty LinkedList
public function __construct(){
$this->head = null;
}
};
Hi, folks, let me share my experience of creating an application to keep track of my spendings. Specifically, let me do it by answering the following questions:
1. Why keep track of spendings in an application?
I, like many people out there, wanted to become rich and successful. To become rich, one is often advised to run a personal budget, that's what I started to do several years ago. I'd like to point out that running my personal budget hasn't made me rich and successful, and I increased income simply by moving to Moscow.
This is the guest article by Maria Antomony, HSE University graduate student, sociologist and code passionate.
