teleren/devto huggingface dataset:
LINQ
Published: 2022-05-23 06:58:32

---
title: LINQ
published: true
date: 2016-10-06 20:00:45 UTC
tags: 
canonical_url: https://www.funkysi1701.com/posts/2016/linq/
---

![](https://storageaccountblog9f5d.blob.core.windows.net/blazor/wp-content/uploads/2016/10/step30.jpg?w=515&ssl=1)

### What is LINQ?

**LINQ** is an acronym for Language Integrated Query, which describes where it’s used and what it does. The Language Integrated part means that LINQ is part of programming language syntax. In particular, both C# and VB are languages that ship with .NET and have LINQ capabilities.

### How do I use LINQ in my C# code?

To use LINQ the first thing you need to do is add the LINQ using statement.

```
using System.Linq;

```

In your code you need a datasource, for this example I am going to use a simple array, but it can be anything eg SQL, XML etc

```
int[] data = new int[10] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

```

Next you need a LINQ query. (Note I know the Q in LINQ means query, so I have just written query query, if you are one of those people who hates seeing PIN number you might not like this blog post.) A LINQ query is very similar to a T-SQL query, so if like me you are good with databases this should make sense to you.

In T-SQL you can have:

```
SELECT num
FROM data
WHERE num = 1

```

In LINQ this becomes:

```
var query =
from num in data
where num == 1
select num;

```

Finally you need to do something with the query you have written. I am just going to print the results of my query to console.

```
foreach (var num in query)
{
  Console.Write(num);
}

```

### What other SQL like syntax can I use?

In T-SQL you can control ordering using ORDER BY, LINQ has a similar syntax orderby

```
orderby num descending

```

In T-SQL you can use GROUP BY, to do something similar with LINQ

```
group num by num.Type into type
select type


foreach (var type in query)
{
  Console.Write(type.Key);
  foreach (var num in type)
  {
    Console.Write(num);
  }
}

```

### JOINS

So you thought joining tables was a SQL Server only thing. Think again you can do this in LINQ

```
var joinquery =
from cust in customers
join prod in products on prod.CustomerId equals cust.Id
select new { ProductName = prod.Name, CustomerName = cust.CompanyName };

```

### Conclusion

There are loads more LINQ functionality that you can use. While writing this blog I found [https://code.msdn.microsoft.com/101-LINQ-Samples-3fb9811b](https://code.msdn.microsoft.com/101-LINQ-Samples-3fb9811b) which has loads of examples of different queries that you can write with LINQ.

This has inspired me to use LINQ more in my code and learn more about the different queries that could be written.
HOW TO RUN DRUPAL ON UHOST IN VPC ENVIRONMENT
Tags: webdev, cloud, tutorial, development
Published: 2023-11-06 08:47:20

Installing Drupal in the cloud offers numerous advantages, including scalability, high availability, and ease of management. SCloud provides a flexible infrastructure that can grow with your website’s needs, ensuring optimal performance during traffic spikes and minimizing downtime. Additionally, cloud environments offer built-in security features, automated backups, and simplified resource management. This not only streamlines the installation process but also reduces the burden of hardware maintenance, making it a practical choice for web developers and businesses looking for a reliable and cost-effective hosting solution for their Drupal websites.

Installing Drupal on a Virtual Private Cloud (VPC) and a cloud compute instance involves setting up a secure and scalable environment for hosting your Drupal website.


Here’s how to use SCloud Console to run your Drupal:
1. Set Up a Virtual Private Cloud (VPC):

Create a VPC to isolate your resources. In the VPC, you can define your network topology, subnets, and security groups to control inbound and outbound traffic.

1.1. Sign in into [SCloud Console](https://www.scloud.sg/)

1.2. Hover over ‘All Products’ on the top left & click on ‘UVPC’

For the complete tutorial, visit: [https://www.scloud.sg/resource/how-to-run-drupal-on-uhost-in-vpc-environment/](https://www.scloud.sg/resource/how-to-run-drupal-on-uhost-in-vpc-environment/)
HOW TO SETUP UDB MYSQL AS YOUR BACKEND DATABASE FOR UHOST
Tags: cloud, database, mysql, tutorial
Published: 2023-11-06 08:45:21

Choosing MySQL as your database in a cloud environment offers several advantages, making it a popular choice for many cloud-based applications and services. To store your application records & data in a MySQL database, SCloud offers UDB MySQL which can be integrated with UHost. Before we jump into the steps for setting up UDB MySQL in SCloud console, here are some reasons to consider MySQL for cloud-based database solutions:

1. Open Source and Cost-Effective
MySQL is open-source software, which means you can use it without incurring licensing fees. This can lead to cost savings, especially in cloud environments where you pay for resources based on usage.

2. Widely Supported
MySQL is one of the most widely supported relational database management systems (RDBMS). It is compatible with numerous programming languages and platforms, making it easy to integrate into various cloud-based applications.

3. Scalability
MySQL can be scaled horizontally and vertically to handle increased workloads. Many cloud providers offer tools and services for easy database scaling, ensuring your application can grow with your user base.

4. High Availability
Cloud platforms provide options for high availability and data redundancy. You can configure MySQL to work in master-slave or multi-node setups to ensure data integrity and minimal downtime.

5. Data Security
MySQL provides robust data security features, including authentication, authorization, encryption, and auditing, to protect your data in the cloud.

Here’s how to use [SCloud Console](https://www.scloud.sg/) to setup UDB MySQL:
1. Spin Up UHost Compute Instance (if not already done so):

1.1. Select the UHost Configuration
a. Region & Availability Zones

For the complete tutorial, visit: [https://www.scloud.sg/resource/how-to-setup-udb-mysql-as-your-backend-database-for-uhost/](https://www.scloud.sg/resource/how-to-setup-udb-mysql-as-your-backend-database-for-uhost/)
HOW TO SETUP UROCKETMQ FOR DISTRIBUTED APPLICATION MESSAGING
Tags: programming, cloud, tutorial, development
Published: 2023-11-06 08:44:52

RocketMQ is an open-source, distributed message-oriented middleware platform for reliable and scalable data streaming and messaging. If you are looking to setup RocketMQ in SCloud, our platform offers a ready and easy to use service called URocketMQ. Before we jump into how you can setup URocketMQ in the SCloud console, do know that deploying RocketMQ in the cloud offers a whole lot of benefits, including:

1. Scalability
Cloud platforms allow you to easily scale your RocketMQ cluster up or down based on your messaging workload. You can add or remove resources as needed to accommodate changing demands.

2. High Availability
Cloud environments provide tools and services for achieving high availability and fault tolerance. You can distribute RocketMQ brokers across multiple availability zones to ensure system reliability.

3. Managed Services
Some cloud providers offer managed message queue services, which can simplify operational tasks like maintenance, patching, and monitoring. This can free your team from low-level infrastructure management.

4. Cost Efficiency
Cloud providers often offer pay-as-you-go pricing models, allowing you to pay only for the resources you use. This can be cost-effective for organizations, especially if they have fluctuating workloads.

Here’s how to use SCloud Console to setup URocketMQ:
1. Create URocketMQ Instance:
1.1. Sign in to [SCloud Console](https://www.scloud.sg/).

2. Select ‘All Products’ on the top left & click ‘URocketMQ’.
For the complete tutorial, visit: [https://www.scloud.sg/resource/how-to-setup-urocketmq-for-distributed-application-messaging/](https://www.scloud.sg/resource/how-to-setup-urocketmq-for-distributed-application-messaging/)
Monitor Website Response Time with cURL [command example]
Tags: seo, curl, website, performance
Published: 2023-11-06 08:41:15

Discover how to measure your website's response time using the `curl` command, and how it can help you **increase traffic** and performance of your webpage.

## Understanding Server Response Time

Server response time, also known as Time to First Byte (TTFB), is the time it takes for the server to process a web request and send the first byte back to the user.

Think of it as the pause before your web pages begin their journey to the user's screen.

## Why Measure The Response Time?

Server response time is a critical part of overall website performance and loading times.

Paying attention to response times has huge benefits:

- **Performance Bottlenecks:** Server response time helps identify potential performance issues on the server, such as slow database queries, excessive load, or under-resourced infrastructure.
- **User Experience:** Quickly loading pages enhance user experience because people do not want to wait for slow-loading pages. A fast response time increases user satisfaction and the desire to use your site.
- **Search Engine Visibility:** Search engines like Google evaluate a site's loading speed as part of its search engine optimization (SEO). Faster pages receive a higher ranking in search results, which helps increase organic traffic and your visibility.

## Measuring Response Time with cURL

cURL is a versatile tool commonly found in MacOS and Linux operating systems. It can be used to make various types of network requests.

Server response time is measured with cURL as follows:

```bash
curl -s -o /dev/null -w "%{time_starttransfer}\n" https://www.enstai.fi/
```

cURL measures how long it takes for the web page at https://www.enstai.fi/ to generate a response. The command returns the response time in seconds.

## Real-World Example

```
juha@MacBook ~ % curl -s -o /dev/null -w "%{time_starttransfer}\n" https://www.enstai.fi/
0.152016
```

Here, the response time is 0.152016 seconds, or 152 milliseconds (ms).

According to Google, **a good response time is under 200 ms**, or less than 0.2 seconds.

It seems that enstai.fi was quicker to respond, which is great!

## Conclusion

In the digital age, speed is of the essence. Monitoring your website's speed with cURL isn't just good practice — it's essential. This diligence is a part of what separates successful websites from the rest.

Keep in mind that each millisecond shaved off your response time can significantly elevate user satisfaction and enhance your position in SEO rankings.
HOW TO INSTALL OPENVPN ON UHOST FOR SECURE ACCESS ANYWHERE
Tags: programming, cloud, security, tutorial
Published: 2023-11-06 08:38:43

Unlock secure and remote access to your cloud infrastructure with OpenVPN. By installing OpenVPN on your Virtual Private Cloud (VPC) and cloud compute instances, you empower your organization with a robust and encrypted virtual private network (VPN) solution that keeps your data and communication safe from prying eyes, while ensuring accessibility from anywhere on the globe.

Here’s how to use SCloud Console to install your OpenVPN:
1. Virtual Private Cloud (VPC):

Establish a Virtual Private Cloud (VPC) within your cloud platform to create an isolated, secure network environment for your OpenVPN deployment. This safeguards your cloud resources and data from external threats.

1.1. Sign in into [SCloud Console](https://www.scloud.sg/)

1.2. Hover over ‘All Products’ on the top left & click on ‘UVPC’

For the complete tutorial, visit: [https://www.scloud.sg/resource/how-to-install-openvpn-on-uhost-for-secure-access-anywhere/](https://www.scloud.sg/resource/how-to-install-openvpn-on-uhost-for-secure-access-anywhere/)
HOW TO DEPLOY A TELEGRAM BOT WITH UVPC AND UHOST
Tags: programming, tutorial, cloud, automation
Published: 2023-11-06 08:36:53

Creating a Telegram bot using Virtual Private Cloud (VPC) and cloud computing resources involves leveraging the power and flexibility of cloud platforms to build and deploy your bot securely and at scale.

In today’s digital age, Telegram bots have become powerful tools for automating tasks, interacting with users, and delivering information. To ensure the security and scalability of your Telegram bot, leveraging cloud computing resources within a Virtual Private Cloud (VPC) is the way to go.

Here’s how to use SCloud Console to build your Telegram Bot:
1. Virtual Private Cloud (VPC):

Set up a Virtual Private Cloud, a private network environment within your cloud platform. VPC provides network isolation and enhanced security, safeguarding your bot’s data and communications.

1.1. Sign in to [SCloud Console](https://www.scloud.sg/)

1.2. Hover over ‘All Products’ on the top left & click on ‘UVPC’

For the complete tutorial, visit: [https://www.scloud.sg/resource/how-to-deploy-a-telegram-bot-with-uvpc-and-uhost/](https://www.scloud.sg/resource/how-to-deploy-a-telegram-bot-with-uvpc-and-uhost/)
Power of Database Transactions in PHP: Ensuring Data Integrity
Tags: php, laravel, database, tutorial
Published: 2023-11-06 08:32:34

Let’s delve into a crucial yet often overlooked aspect of PHP development: “Database Transactions.” It’s a technique that safeguards your data’s integrity during complex operations.

Why Are Database Transactions So Vital?

📌 1. Data Consistency: Transactions ensure that a series of database operations either all succeed or none of them do. This prevents partial updates that could lead to data inconsistencies.

📌 2. Error Handling: Transactions help you handle errors gracefully. If any part of the transaction fails, you can roll back the entire operation, keeping your data in a consistent state.

📌 3. Performance: Transactions often perform better than issuing individual queries, as they minimize the number of times data is written to the database.

📌 4. Data Security: Critical operations, such as transferring funds between accounts, depend on transactions to guarantee data security.

How Do Database Transactions Work in PHP?

Let’s consider an example where you’re transferring money between two bank accounts in a PHP application.

Without transactions:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/xa5cc1m0nhqsff7sdj43.png)

If an error occurs during the deposit operation, the money is withdrawn but not deposited, leading to an inconsistent state.

With transactions:

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/foo51qayj33cecnk4602.png)

Here, a transaction ensures that either both the withdrawal and deposit succeed, or neither does. If an exception occurs, the entire operation is rolled back.

How to Leverage Database Transactions:

1️⃣ Begin a Transaction: Start a transaction using your database connection.

2️⃣ Execute Database Operations: Execute the series of database operations you want to include in the transaction.

3️⃣ Commit or Roll Back: If all operations succeed, commit the transaction. If any operation fails, roll back the transaction to its original state.

In an industry where data accuracy and reliability are paramount, database transactions are a powerful tool that every PHP developer should master. They ensure data integrity, error handling, and consistent performance.

Have you used database transactions in your PHP projects? Share your experiences and insights. 🚀

#PHPDevelopment #DatabaseTransactions #ProgrammingTechniques #DataIntegrity
Comparing Sets in Python
Published: 2023-11-06 08:27:27

Comparing Set - is the ability to check if a given subset or superset of another set.
The result is True or False depending on the elements present in sets.

```
Enter the below code to experience it pratically.
DaysA  = set(["Mon","Tue","Wed"])
DaysB  = set(["Mon","Tue","Wed","Thu","Fri","Sat","Sun"])


SubsetRes  = DaysA <= DaysB
SupersetRes  = DaysB >= DaysA

print(SubsetRes)
print(SubsetRes )
```
**output**
When the above code is executed here below is the result

```
True
True

```
Classic Clothes You Always Need: Women's Fashion Basics
Tags: onlineclothingstore, fashion
Published: 2023-11-06 07:40:23

Introduction: 

In the ever-changing world of fashion, some things remain timeless. We're talking about those classic pieces that every woman should have in her wardrobe. These fashion basics are like your style's best friends, always there to help you look great. So, let's explore these must-haves for a timeless and classy look, which can also be found in your favorite online clothing store.

The Little Black Dress: 


We kick off with the legendary LBD - a staple in every woman's wardrobe. It's versatile, chic, and suits various occasions. Pair it with a jacket for work or glam it up with accessories for a night out. This classic piece is a go-to option for girls' casual outfits and teenage girls' fashion. You can find stylish casual wear like the LBD in online clothing stores. 


White Button-Down Shirt: 

A white button-down shirt is the epitome of classic elegance. It's perfect for professional settings and can be dressed down with jeans for a casual yet polished look. This versatile shirt is a key component of girls' everyday fashion and trendy girls' clothing.

Dark Denim Jeans: 

Dark denim jeans are incredibly versatile. They're a flattering choice that can be dressed up or down. They're comfy, trendy, and suitable for multiple styles, making them a fantastic option for comfortable casual attire and fashionable casual styles for teens.

Tailored Blazer: 
A well-fitted blazer instantly elevates any outfit. Whether worn over a dress or with jeans, it adds sophistication and style. This wardrobe staple is great for casual fashion for teens and can be found in online clothing stores.

Ballet Flats: 

Ballet flats are both comfy and stylish. These are the perfect go-to shoes for everyday wear. They come in various colors and patterns to match your style, making them a fantastic choice for trendy girl's clothing.


Statement Accessories: 

A statement necklace, some bold earrings, or an eye-catching scarf - accessories can change your entire look. They're the cherry on top for your fashion basics and can add a touch of creativity to your outfit.

Conclusion: 

These women's fashion basics form the foundation of a timeless and elegant wardrobe and can be easily discovered in your favorite online clothing store. They make daily styling a breeze and provide endless opportunities for creativity. So, embrace the classics, and let your personal style shine in stylish casual wear, girls' everyday fashion, and more. Explore our collection today on our website,( https://radprix.com/) and elevate your fashion journey with enduring sophistication to find these classic pieces that never go out of style.

Photo by EVG Kowalievska: https://www.pexels.com/photo/women-wearing-multicolored-pullover-hoodie-and-black-jacket-1158669/



![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/5gm7tbmb1watnighpum0.jpg)
Node.js Observability Tool: Enhance Visibility Without Performance Impact
Tags: node, k6, performance, javascript
Published: 2023-11-06 08:12:11

## Introduction

Load testing is a crucial process for understanding how your application performs under various conditions. In this article, we examine the effectiveness of Errsole. 
We focus on key performance metrics—average response time, the 90th percentile (p90), and the 95th percentile (p95) response times—comparing load testing results with and without Errsole to assess its impact.

**Load Testing Scenario**
For this analysis, we conducted a load test using [K6](https://k6.io), a popular open-source load testing tool. The load testing scenario consisted of the following configuration:

- 500 virtual users (VUs) for 1 minute
- 1000 VUs for 3 minutes
- 500 VUs for 1 minute
- Sleep time of 3 seconds between iterations

We monitored the application's response times and behavior under these conditions with and without Errsole.

> [Errsole](https://www.errsole.com): Errsole is an error logger and remote debugger for Node.js apps. With Errsole, developers can view the root cause of every error, reproduce any error with just a click, and debug the server code without affecting the live app and its users.

**Load Testing Environment**
In our load-testing scenario, we used the following technologies:

- HTTP method: POST API
- Database: SQLite
- Nodejs framework: Express
- Server: AWS EC2

**Load Testing Results**

Without Errsole:
- Average response time: 2.53 seconds
- 90th percentile (p90) response time: 4.42 seconds
- 95th percentile (p95) response time: 4.64 seconds
- Iterations completed: Approximately 35,000

With Errsole:
- Average response time: 2.56 seconds
- 90th percentile (p90) response time: 4.47 seconds
- 95th percentile (p95) response time: 4.65 seconds
- Iterations completed: Approximately 35,000

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/4ik7o962i4rb4gw9ksgc.png)

## Analysis
The results of the load testing indicate that, in this specific scenario, the use of Errsole has minimal to no effect on the application's performance. When comparing average response times, there is only a marginal difference between the runs. The 90th and 95th percentiles also exhibit similar patterns.

Furthermore, the number of iterations completed in both test runs is approximately 35,000, with virtually no difference between them.
Difference of Sets in Python
Published: 2023-11-06 08:08:12

The difference() method returns a set that contains the difference between two sets. The returned set contains items that exist only in the first set, and not in both sets.

Enter the below code into the interactive shell and try to execute it to see the results.

```
clubs  =set(["Manchester-United","Arsenal","Chelsea","Manchester-City",])

clubsb = set(["Everton","Manchester-United","Liverpool","Totehnam"])


allcubs =  clubs - clubsb
print(allcubs)

```
When the above code is executed it produces the above result.
```
{'Chelsea', 'Arsenal', 'Manchester-City'}
```
📌 Azure Terraform tip: features block inside the provider definition.
Tags: azure, terraform, design, cloud
Published: 2023-11-06 08:00:00

One of the least known option in Terraform for hashtag#Azure users is the features block inside the provider definition.

✅ This is a very useful and even a recommended way to put some of your policies that Terraform will use when manipulating the resources.

For e.g.
- You can specify that the resource group will not be deleted if it contains resources.

- Force the purge of the soft deletes when a key vault is deleted.

- Even for VMs, you can define a few rules to check against.

👉 If you want to see more examples, here is the documentation page: https://lnkd.in/eqAukBcA

🛡️ If you are using Brainboard.co this block is managed for you automatically and our team is always available to provider recommendations or help if needed.
Union of Sets in python.
Published: 2023-11-06 07:49:49

Union of sets is the process of combining two existing sets to become distinct Set Object. Enter the following code into a python file and see the output.


```
First11 = set(["Sanchez","Reece James","Levi colwil","Thiago Silva","Cucurella","Caicedo","Enzo Fernandez","Callagher","sterling","Palmer","Mudryk"])
Substitutes  = set(["Deivid","Madueke","Disasi","Malo-Gusto","Badiashile","Pektovic"])



chelsea =  First11|Substitutes

print(chelsea)
```
**output**
When the above code is executed, it produces the following result

```
{'Malo-Gusto', 'Enzo Fernandez', 'Disasi', 'Madueke', 'Badiashile', 'Pektovic', 'Cucurella', 'Thiago Silva', 'Reece James', 'Sanchez', 'sterling', 'Callagher', 'Palmer', 'Mudryk', 'Deivid', 'Caicedo', 'Levi colwil'}
```