teleren/devto huggingface dataset:
In a Multilevel Relationship, How to Replace Null Values at Nodes by Corresponding Values at Their Parent Nodes
Tags: sql, database, development, language
Published: 2024-04-17 07:50:58

We have a database table EXAMPLE, which has data as follows:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/p4li2xqyvp4un4i0jlzc.png)
Some records have nulls under FK field. We are trying to replace each null with “FK value of the direct parent node”, and write the corresponding PK value in the indent format at output. If the parent node is also node, find the FK value recursively upward. Below is the desired result:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/4shhwwwnc0g5dx28vl4v.png)
Oracle的SQL：

```
SELECT

    LPAD(' ',LEVEL) || PK AS PK,

    NVL(FK, REGEXP_SUBSTR(SYS_CONNECT_BY_PATH(FK,'/'),'(\d+)/*$',1,1,'',1)) AS FK,

    PARENT

FROM EXAMPLE

START WITH PARENT='000' CONNECT BY PRIOR PK = PARENT;
```
A recursive operation is needed here to replace the current FK value with that in the direct parent node. It is not very hard to achieve a recursive query in Oracle. The true difficulty lies in the subsequent computations, where the FK value on the superior node will be referenced. As SQL does not have concepts of explicit records and reference, it uses the regular expression to handle strings generated according to the recursive relationship. That is too hard.


It is easy to code the task in the open-source esProc SPL, without using the difficult regular expression:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/okklqgavt5pggjze2y57.png)
SPL supports explicit records to be able to convert the referencing foreign key into a record type field, making it convenient to handle subsequent computations after the recursive operation.
Tech Guy Journey
Tags: webdev, javascript, beginners, programming
Published: 2024-04-17 07:36:06

Hey Dev fam! 
I'm on a mission to become a tech guy and I'm diving headfirst into learning React and NextJS! Here's why I need YOUR help on this journey: 

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If you're a seasoned dev or just passionate about tech, I'd love your advice, tips, and resources!

2️⃣ Why React and NextJS? 🤔 
They're game-changers in web development, and I'm determined to master them for future projects. Any favorite tutorials or projects I should check out?

3️⃣ Let's talk challenges! 🎯
What obstacles did you face when learning React or leveling up in your tech career? I'm ready to embrace the learning curve with open arms!

4️⃣ Mentorship magic! 🪄 
If you're willing to share your expertise or mentor remotely, I'd be forever grateful. Let's connect and grow together!

5️⃣ Community power! 🌐 
Whether you're a self-taught coder, bootcamp grad, or industry veteran, your insights matter. Let's build a supportive network!

Reply, repost, or DM me! Let's amplify this thread and make my journey to tech guy epic! 🚀
Отдых программиста в после тяжёлого рабочего дня
Published: 2024-04-17 07:35:27

Программирование — это работа, требующая высокой концентрации внимания и умственных усилий. После тяжёлого дня, полного кода и отладки, каждому программисту необходимо хорошо отдохнуть и расслабиться. Один из необычных, но весьма популярных способов снять стресс и отвлечься от рутинных задач — это посещение онлайн-казино. Рассмотрим, как программисты могут отдыхать, играя в казино SpinBetter после напряжённого рабочего дня.

#### Погружение в другой мир

Игры в казино могут стать отличным способом переключения для уставшего ума. Сложные алгоритмы и логические задачи заменяются на яркие слоты, стратегические настольные игры или динамичный покер. SpinBetter предлагает огромное разнообразие игр, которые могут удовлетворить любые предпочтения. Это не только помогает расслабиться, но и дарит волнение от возможных выигрышей и новых открытий.

#### Социализация и общение

Работа программиста часто связана с одиночеством и долгими часами за компьютером. Онлайн-казино может стать местом, где можно общаться с другими игроками через чаты в живых играх или участвовать в турнирах. SpinBetter Casino предлагает различные форматы игр, где участники могут взаимодействовать друг с другом, что делает игровой процесс более живым и социальным.

#### Релаксация и игровые бонусы

Игра в казино не только развлекает, но и может быть выгодной, благодаря многочисленным бонусам и акциям. SpinBetter часто предлагает привлекательные промоакции, бонусы за регистрацию и лояльности, которые делают игру ещё приятнее. Например, новые игроки могут воспользоваться приветственным бонусом, который удваивает первый депозит, что дополнительно мотивирует после утомительного дня.

#### Как начать?

Для тех, кто хочет попробовать свои силы в онлайн-казино после рабочего дня, процесс начала очень прост. Для начала нужно зарегистрироваться на сайте. Используйте [сайт Спинбеттер](https://www.spinbetter-casinos.com/spinbetter-mobilnoe-kazino-onlajn/), чтобы быстро и безопасно создать аккаунт, внести депозит и начать игру. Процесс регистрации занимает всего несколько минут, а удобство использования сайта обеспечивает мгновенный доступ к вашим любимым играм.

#### Заключение

Игра в казино может стать замечательным способом для программистов отдохнуть после трудного дня. Это не только отличная возможность расслабиться и отвлечься от повседневных задач, но и шанс почувствовать азарт, улучшить
igstorysaver
Published: 2024-04-17 07:33:50

Download Reels, Videos, Stories, Photos, IGTV from Instagram with single click 
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CapitalVault Cryptoで投資の未来を発見する
Published: 2024-04-17 07:30:56

デジタル通貨の分野が急速に発展している現在、信頼性が高く、安全で革新的な取引所を選ぶことは投資家にとって非常に重要です。
CapitalVault Crypto取引所は、グローバル金融センターであるシンガポールに登録されており、優れた安全性、安い取引手数料、豊富なデジタル資産への投資オプションにより、急速に世界の多くの投資家に選ばれております。
この記事では、CapitalVault Crypto取引所が貴方のデジタル資産投資の旅のための最良のパートナーである理由を示すために、包括的な説明を致します。
 
コアチーム:プロフェッショナルとイノベーションの融合
CapitalVault Crypto取引所のコアチームは、世界トップクラスの金融機関やテクノロジー企業の専門家で構成されております。
彼らは金融知識や市場経験が豊富なだけでなく、最新のブロックチェーン技術や暗号通貨のトレンドについても鋭い洞察力を持っております。
このチームの専門性と革新的な精神は、CapitalVault Cryptoの発展のために強固な基盤を提供し、プラットフォームが絶えず革新的な製品を発表し、市場の需要を満たすことを保証します。
 
取引コスト:競争力のある低コストモデル
CapitalVault Cryptoでは、投資家一人ひとりにとって取引コストの重要性を理解しております。


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/rpaxn85ed6vhf96xq40y.jpg)
そこで、競争力のある低料金モデルを提供し、ユーザーに最大の価値を提供することを目指しております。
技術と運用プロセスを継続的に最適化することで、運用コストを削減し、これらの節約をユーザーにフィードバックすることで、より低い取引コストとより高い投資リターンを実現しております。
 
セキュリティ:金融レベルの資産セキュリティシステム
CapitalVault Cryptoが最も重視しているのは、アセットセキュリティです。
我々はウォレット分離、多重署名検証、リアルタイム監視システムなどの多層的なレベル、全方位の安全措置を取って、ユーザーの資産とデータの安全を保障します。

また、CapitalVault Cryptoは、世界的に有名なセキュリティ機関と協力して定期的にセキュリティ監査を行い、プラットフォームの安全性を常に業界トップレベルで確保しております。
 
CapitalVault Crypto:独自の競争優位性
CapitalVault Crypto取引所は、手数料率の低い契約取引と質の高いICOプロジェクトが優位に立っており、将来的にはナスダック上場の計画があります。

その中でもICOプロジェクトは、業界内の優良投資プロジェクトのトップランナーであり、多くのディストリビュータとの提携やユーザーからの投資が注目されるプロジェクトとなっております。
このプロジェクトは、業界の伝説的な投資家を生み出すでしょう。
FOFマイニングプールプロジェクトは、業界内の優良なマイニングマシーンを組み合わせた投資プロジェクトで、リスクが低くリターンが安定していることが主な特徴です。
 
 
商品・サービス:多様な投資オプション
革新的なデジタル資産取引所であるCapitalVault Cryptoは、主要なデジタル通貨、有望株のプロジェクト、派生商品を含む豊富な取引オプションを提供しております。
堅実な投資を求めるベテランプレイヤーも、成長性の高いプロジェクトを求める冒険家も、CapitalVault Cryptoで適切な投資タイミングを見つけることができます。
 
グローバルな視野:世界の投資家へのサービス
CapitalVault Cryptoは世界中のユーザーに良いサービスを提供することを目指しております。

弊社のプラットフォームは多言語の操作をサポートし、カスタマーチームも多言語のサービスを提供することができます。

異なる国と地域から来たユーザーが便利で専門的なサービスを享受できることを保証します。
また、グローバル市場の動向や規制の変化にも注意を払い、ユーザーにコンプライアンスと安全な取引環境を提供しております。
 
CapitalVault Cryptoを選択して、デジタル資産への投資を開始します。
私たちは貴方の取引プラットフォームだけでなく、貴方の信頼できる投資パートナーです。今すぐ私どもに参加して、無限の可能性に満ちた暗号通貨の世界を一緒に探検しましょう！
9章6
Published: 2024-04-09 02:53:29

このコードの解説を行います。

```java
1.  import java.time.DayOfWeek;
2.  import java.time.LocalDate;

4.  public class Sample {
5.      public static void main(String[] args) {
6.          LocalDate a = LocalDate.of(2019, 8, 19); // 'a'に2019年8月19日の日付を設定
7.          LocalDate b = LocalDate.now(); // 'b'に現在の日付を設定
8.          b.with(DayOfWeek.MONDAY); // 'b'の日付を同週の月曜日に設定するが、結果は無視される
9.          System.out.println(a.equals(b) // 'a'と'b'が等しいか判定し、結果を出力
10.                            + ", " + a.isBefore(b)); // 'a'が'b'より前の日付か判定し、結果を出力
11.      }
12.  }
```

6行目では、`LocalDate`オブジェクト`a`を2019年8月19日に設定しています。

7行目では、`LocalDate`オブジェクト`b`を現在の日付に設定しています。

8行目では、`b.with(DayOfWeek.MONDAY);`という行があります。このメソッドは`b`の日付をその週の月曜日に設定しようとしますが、`LocalDate`は不変オブジェクトであり、メソッドを呼び出しても元のオブジェクトは変更されません。このメソッドから戻る新しい`LocalDate`オブジェクトを何の変数にも割り当てていないため、この操作は無視されます。

9行目と10行目では、`a.equals(b)`は`a`と`b`が同じ日付かどうかを判定し、`a.isBefore(b)`は`a`が`b`よりも前の日付であるかを判定します。

このコードが実行された日（つまり`LocalDate.now()`が返す日）が2019年8月20日であると仮定します。この場合、`a`と`b`は同じ日付ではありませんので、`a.equals(b)`は`false`になります。また、`a`（8月19日）は`b`（8月20日）よりも前の日付ですので、`a.isBefore(b)`は`true`になります。

そのため、プリントされる結果は`false, true`となり、選択肢Dが正しい答えになります。
Hair Disclosure | Best Hair Patch and Hair wigs Center in Kankurgachi, Kolkata
Tags: hairpatch, hairwigs, wigs, hairextension
Published: 2024-04-17 07:15:16

Hair Disclosure is your local clinic for non-surgical hair solutions in Kankurgachi, Phoolbagan, Kolkata. Specializing in hair wigs for both ladies and gents, we provide a significant solution to baldness without the need for surgery. Our clinic is renowned for its professional hair extension and patching services in Kankurgachi, offering a seamless and natural look. Whether you're seeking to enhance your style or find a solution to hair loss, our expert team will deliver personalized care and attention. We understand the importance of feeling confident and our hair wigs and extensions are designed to give you just that. Team Hair Disclosure believes in transforming lives, one strand at a time. Visit us for a consultation and discover how we can help you achieve the hair you've always wanted. 

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HTML Interview Questions
Published: 2024-04-17 07:15:15

Q. How do you change the style of a HTML element
You can change inline style or classname of a HTML element using javascript

Using style property: You can modify inline style using style property
document.getElementById("title").style.fontSize = "30px";
Using ClassName property: It is easy to modify element class using className property
document.getElementById("title").className = "custom-title";
Send the token key from the user-side frontend, and handle it from the backend
Tags: php, programming, beginners, codeigiter
Published: 2024-04-17 07:13:51

**How to send the token key from the user-side frontend, and how to handle it from the backend? Additionally, which method should be used to ensure a secure token key approach in CodeIgniter?**

[How to send a token with every request using HTTP headers?](https://dgihost.com/index.php/2024/04/17/how-to-send-a-token-with-every-request-using-http-headers/)

[Which encryption is used to secure the token key?](https://dgihost.com/index.php/2024/04/17/which-encryption-is-used-to-secure-the-token-key/)


To implement token-based authentication in CodeIgniter, you can follow these steps:

**Generate Token:**

When a user logs in, generate a unique token for that user.
This token should be securely generated using a strong hashing algorithm and should have a limited lifespan to enhance security.

**Send Token to Client:**

After generating the token, send it back to the client (frontend) as part of the login response.

Typically, this token is sent in the response body or headers, depending on your application's requirements.

In JavaScript frameworks like Angular or React, you would typically store this token in local storage or session storage.

**Send Token with Every Request:**

On the frontend, ensure that the token is sent with every subsequent request to the backend.
You can achieve this by setting the token in the headers of your HTTP requests.

**Validate Token on the Backend:**

In your CodeIgniter backend, create a middleware or interceptor to validate the token sent with each request.
This middleware should check the validity and expiration of the token.
If the token is invalid or expired, deny access to the requested resource.

**Renew Token (Optional):**

Optionally, you can implement a mechanism to renew tokens to avoid frequent logins.
This can be done by issuing a new token with a refreshed expiration time upon successful token validation.

**Logging Out:**

To log out a user, simply invalidate or delete the token from both the client and the backend.
On the client-side, remove the token from local storage or session storage.

On the server-side, you might have to maintain a blacklist of invalidated tokens.

[How to send a token with every request using HTTP headers?](https://dgihost.com/index.php/2024/04/17/how-to-send-a-token-with-every-request-using-http-headers/)

[Which encryption is used to secure the token key?](https://dgihost.com/index.php/2024/04/17/which-encryption-is-used-to-secure-the-token-key/)


In CodeIgniter, you can handle token-based authentication using libraries like Firebase JWT, JWT, or implement it manually using PHP's native JWT library. These libraries provide methods for token generation, validation, and expiration handling. Choose a library that best fits your project requirements and integrate it into your CodeIgniter application for secure token-based authentication.

Thanks for reading,
Dgi Host.com
Hân Nghi
Published: 2024-04-17 07:10:43

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Top 25 Software Companies in Bangladesh (2024)
Tags: topsoftwarecompanyinbangladesh, bestsoftwarecompany, topitcompanyinbangladesh
Published: 2024-04-17 07:09:57

In 2024, these are the [top software development company in Bangladesh.](https://www.ontiktechnology.com/blog/top-software-companies-in-bangladesh)
**Top 25 Software Development Companies in Bangladesh**
1. Ontik Technology  
2. Brainstation 23 
3. Tiger IT
4. BJIT
5. Enosis
6. Cefalo
7. LeadSoft  
8. REVE Systems
9. South Tech
10. Riseup Labs
11. Soft BD Limited
12. Dream 71 Bangladesh 
13. Kaz Software
14. Bondstein
15. Nascenia
16. Pridesys IT 
17. Selise 
18. Bdtask
19. Dynamic Solution Innovators
20. Orange IT
21. Workspace Infotech
22. Daffodil Software
23. Craftsmen Ltd
24. Astha IT 
25. Vivasoft
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Published: 2024-04-17 07:03:37

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Web Bytes - Shadow DOM
Tags: html, webdev, shadowdom, fundamentals
Published: 2019-10-30 02:56:54


## What is Shadow DOM and why is it important?

Web components have a key concept of encapsulation. 
Keep the html markup, css styling and js behavior separate from the rest of the page code.
This enables to keep the DOM and code clean.

The Shadow DOM enables attachment of a hidden DOM structure to a visible page DOM element.

![Alt Text](https://thepracticaldev.s3.amazonaws.com/i/who6ptybuhg1fr37nowi.jpg)
###### Photo by Daniel Cheung on Unsplash

---

## Key Concepts

Shadow DOM tree structure is just like a regular DOM tree, but hidden.

- **Shadow host**: The visible DOM tree node that connects to the shadow DOM tree.
- **Shadow tree**: The shadow DOM tree.
- **Shadow boundary**: The perimeter that separates the visible DOM from the shadown DOM.
- **Shadow root**: The root node inside the hidden shadow DOM tree.

### Illustration

![Alt Text](https://thepracticaldev.s3.amazonaws.com/i/u2rtvojngismgx3tcnol.png)

---
## Analogy

The **regular DOM is like the minifigure of stormtrooper** being tossed up in the air. It's individual pieces like nodes are visible and the tree structure is conspicuous.

The **shadow DOM is like the classic action figure style stormtrooper**. It's nodes are fused and abstracted and the tree structure is not conspicuous.   

![Alt Text](https://thepracticaldev.s3.amazonaws.com/i/3e4lu819s6azrfw7k7ea.jpg)
###### Photo by Daniel Cheung on Unsplash

---

## Famous Example

The **video** element has default browser controls, with various controls abstracted from view using the shadow DOM.

## Practical Applications 

Encapsulating styles and behavior helps in developing components and component libraries that can be dropped into and used in various applications.

---

## Usage

Shadow DOM can be created in `open` or `closed` modes.

```javascript
// can be manipulated by outer context js
Element.attachShadow({ mode: 'open'});

// or 

// cannot be manipulated by outer context js
Element.attachShadow({ mode: 'closed'});
```

Shadow DOM nodes can be manipulated using regular DOM APIs.

```javascript
document.createElement();

Element.setAttribute('class','some-class');

Element.appendChild();
```

---

## Closure

This fast article is intended to clarify and bolster web technology fundamentals.

#### References
 
[MDN: Using shadow DOM](https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_shadow_DOM)
Angular Signals: Streamline Data Flow and Boost Maintainability
Tags: angular, frontend, javascript, typescript
Published: 2024-04-17 07:01:53



### What are Signals?

Imagine a central nervous system for your Angular app. Signals act as the messengers, seamlessly transmitting data updates between components without tight coupling. These signals can represent various data types, from user input to application state or data fetched from external sources.

There are two main types of signals:

### Writable Signals: 
These signals allow you to directly modify their values, providing a clear path for data updates.

### Read-Only Signals: 
Derived from other signals, these offer a reactive approach, calculating their values based on changes in the source signals. They boast lazy evaluation, meaning the calculations happen only when needed, and memoization, ensuring efficient performance.

### Benefits of Embracing Signals
By incorporating Signals into your Angular projects, you reap a multitude of advantages:

1. **Enhanced Maintainability:** Decoupling components leads to cleaner code that's easier to understand and manage. Imagine a well-organized system where components don't rely directly on each other, making modifications a breeze!

2. **Improved Testability:** Signals allow you to isolate components during testing. Simply provide different signal values and observe component behavior. This streamlines the testing process and boosts confidence in your code.

3. **More Reactive Applications:** Signals empower you to create applications that respond swiftly to data changes. This translates to a more dynamic and interactive user experience.


### Code Examples: Unleashing the Power of Signals

Let's delve into some code examples to solidify your understanding of Signals:

### Writable Signals in Action:

```javascript
import { signal } from '@angular/core'; // Import the signal function

const count = signal(0); // Create a writable signal with an initial value of 0

function incrementCount() {
  count.update(value => value + 1); // Update the count using update()
}

console.log('Initial count:', count()); // Get the current value using the signal function

incrementCount();
console.log('Count after increment:', count());
```

### Computed Signals: Deriving Values

```javascript
const firstName = signal('John');
const lastName = signal('Doe');

const fullName = computed(() => `${firstName()} ${lastName()}`); // Define a computed signal based on other signals

console.log('Full name:', fullName());

firstName.set('Jane'); // Update the firstName signal

console.log('Full name after update:', fullName()); // fullName automatically reflects the change

```

### Embrace the Signal Revolution

Signals offer a compelling approach to streamline data flow, enhance maintainability, and create more responsive Angular applications. So, the next time you're building your Angular project, consider incorporating Signals and witness the magic unfold!