Programming

Why is Blockchain a big deal?

0
2 years
by in Blockchain

What are the security aspects that make the blockchain unique as compared to previous security mechanisms and systems?

Compared to earlier security procedures and systems, blockchain technology has several distinctive security features, including:

Decentralization: Rather of being managed by a single entity, the blockchain is a distributed ledger that is maintained by a network of nodes. It is far more challenging for hackers to attack the system and change data because of this decentralized architecture.

Encryption: All blockchain transactions are encrypted, making it very challenging for anyone to intercept and access the data.

Immutability: A transaction that has been added to the blockchain cannot be changed or removed once it has been added. The blockchain is therefore perfect for applications where data integrity is crucial since it offers a tamper-proof record of all transactions.

Consensus: The blockchain relies on a consensus mechanism to verify transactions and uphold the accuracy of the ledger. By ensuring that all network nodes concur on the ledger’s current status, this method makes it far more difficult for attackers to modify the data.

Smart contracts: are self-executing contracts that automatically carry out the terms of an agreement when specific criteria are satisfied, and they can be created using blockchain technology. Complex commercial operations can now be automated, lowering the possibility of mistakes and fraud.

What are the most important benefits that the blockchain provides to all blockchain applications better than other security systems?

Decentralization: The blockchain’s decentralized structure prevents it from being governed or controlled by a single entity. This makes it perfect for applications requiring a high level of security and trust, like supply chain management and financial transactions.

Transparency: The blockchain gives users access to an auditable and transparent record of all network transactions. This degree of openness guarantees that all participants may see the specifics of a transaction and confirm its legitimacy.

Immutability: Data on the blockchain cannot be changed or removed once it has been stored there. As a result, the blockchain is perfect for applications that need to keep a record of transactions and data that cannot be altered.

Efficiency: Compared to conventional systems, transactions using blockchain technology can be processed significantly more quickly and effectively. This is because transactions can be handled simultaneously by several network nodes, as opposed to being handled sequentially by a centralized authority.

How is the blockchain market expected to develop in the next few years?

With a predicted CAGR of 56.3% over the projection period of 2022-2029, the worldwide blockchain market is expected to increase from $7.18 billion in 2022 to $163.83 billion by 2029. Consequently, one of the new trends anticipated to fuel the growth of the blockchain market is the increasing awareness of data protection from virus activities among businesses and consumers.

From Bytes to Insights: Harnessing the Power and Potential of Big Data

2 years
by in Data Science

What impact does the scale of large data have?
Data has become capital and leverage for companies that collect it at scale. The amount of data that gets harvested and stored into a database makes it difficult to understand without a proper data analytics approach [1]. The larger the data becomes the harder it is to build an algorithm that can mitigate errors and present a coherent chart or search result that can present a useful analysis.


Is it enough to collect data?
The action of collecting data by itself can be sufficient if you are only attempting to store information and displaying it back to the user once they demand. However, if you are trying to build an intelligent result out of it for example if you are performing an internet search result you will need to perform analysis on the data using a formula. An idea of a formula can be linear regression which can parse the data by filtering the margin of error out of it. Data mining has emerged as a solution that can resolve the issue of completeness to build a pattern and optimization to filter the good data out of the dataset [2].


What and how can we learn from data?
We can learn from data a trend or discover a problem. When we build a formula that can analyze a large amount of data, the formula should be able to present the data to us in a fashion that outlines irregularities but also most importantly trends.


How can we turn data into useful insights?
Charting data can present a visual image that can help simplify millions of data points into a human friendly image. Grouping similar instances by normalizing the relation of data in a table that has an X,Y representation can draw a line chart that could present the behavior of a trend [2]. For example, if we are tracking the price of rice on the open markets for 10 years, we might have price fluctuation based on (dates, price as X,Y) the line normalization in the chart cleaning error margins from market fluctuation can possibly bring forth huge market movers that occurred in the 10 years for example a war, a drought or a disease.

References
1. Silberschatz, A., Korth, H.F. and Sudarshan, S., 2019. Database system concepts. New York: McGraw-Hill.
2. Han, J., Kamber, M. and Pei, J., 2011. Data mining: Concepts and techniques. Amsterdam: Elsevier.

What is network security?

2 years
by in Network Security
  1. What do we mean by network architecture? 
  2. What are the most widely used architectures in computer networks?
  3. What is a protocol and why is it needed?
  4. What is a network protocol and what does it contain?
  5. What are the significance and the role of a protocol in network architecture?

Network architecture encompasses the design and layout of a computer network, including both physical and logical components and how they interact with one another. The most commonly employed architectures in computer networks are client-server and peer-to-peer. The client-server architecture includes one or more central servers that provide services to multiple clients, while in a peer-to-peer architecture each device on the network functions as both a client and server. Protocols are a set of guidelines and rules that regulate communication between devices on a network, which are necessary to ensure devices can communicate effectively and efficiently and prevent conflicts and errors. Network protocols include rules and guidelines for transmitting data over a network, including the format of the data, how it’s broken into packets, and the routing of packets through the network. Protocols play a vital role in network architecture, as they are the foundation of network communication and without them, data would not be able to flow between devices. They permit devices to communicate with each other, regardless of hardware or software and ensure that data is transmitted accurately and efficiently. Additionally, a good protocol allows for easy scalability and troubleshooting of the network. In conclusion, protocols are necessary for smooth communication and coordination within a network, without them it would be impossible to transmit data between devices, they are the backbone of network communication, ensuring accurate and efficient data transmission and enabling communication between devices regardless of hardware or software.

How to mass delete comments in WordPress

0
2 years
by in Wordpress

METHOD 1:

To mass delete comments in the WordPress admin panel, follow these steps:

  1. Log in to the WordPress admin panel and go to the “Comments” section.

  2. On the comments page, you will see a list of all the comments on your site. You can select multiple comments by clicking the checkbox next to each comment you want to delete.

  3. Once you have selected the comments you want to delete, scroll to the top or bottom of the comments list and look for the “Bulk Actions” dropdown menu.

  4. Select “Move to Trash” from the dropdown menu. This will delete the selected comments from the site.

  5. To permanently delete the comments, go to the trash section and select the comments you want to delete permanently and click on “Empty trash” or you can also select all the comments and delete it once.

Note that deleting comments permanently will remove them from the site permanently and it will not be recoverable.

Additionally, in case you have thousands of comments and you want to delete all of them, you can use a plugin such as “Delete All Comments” or “Bulk Delete” to delete comments in bulk. These plugins will enable you to select and delete comments based on different criteria, such as date, author, and more.

WordPress also has an inbuilt feature to approve, unapprove, mark as spam, move to trash and delete comments in bulk. It can be found by clicking on the checkbox on the top of the comment list, which will give you option to perform bulk actions on selected comments.

It’s always a good practice to take a backup of your website before making any major changes.

METHOD 2:

You can also go to plugins -> Add new plugin and search the WP Bulk Delete plugin and use that to delete more than the allowed page comments at once.

The most important trait for a Software Engineer

5 years
by in Software Engineering

When you are dealing with other people in life, you need to treat them how you expect to be treated. Projecting a positive attitude will most of the time reflect it back at you. However, the world can present you challenges, and you have to handle them graciously, especially if you’re a team leader (Carpenter, Bauer, & Erdogan, 2010).

As a software engineer, you build the roadmap for other software developers to follow when constructing a software product. While a balanced combination of all five personality traits: Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism is essential (2MinutePsychology, 2013), it is smart to adjust the dimension to suit based on the situation.

An essential personality trait as a software engineer would be openness. Being open with your team covers most of the spectrum. When you are engineering software, most of the time, you don’t have the complete picture instantly. On the one hand, this situation would require you to be open to receiving ideas, criticism, and suggestions. On the other hand, you will need to be transparent with your team about problems, evaluation, and cost (Iqbal, Aldaihani, Shah, 2019). Any software that does not establish this two-way route in openness will face many hurdles when dealing with his developers. While a software engineer might see the bigger picture, the developer sees the details and is the first in the line of offense (Iqbal, Aldaihani, Shah, 2019). Therefore, feedback from and to your developers is critical.

Openness can also streamline motivation, innovation, and trust. When you are honest, the team of developers wants to help you achieve the final goal because the benefits are clear on the table to everyone. Openness can also be a pillar for innovation, which is at the center of programming. The power of openness to achieve imagination and interest for your team can catalyze to produce the best product (Carpenter, Bauer, & Erdogan, 2010).

A smart team leader generally or a software engineer specifically can be at the center of innovation for their firm (Iqbal, Aldaihani, Shah, 2019). Through a routine practice of openness, the daily tasks at hand can make the workplace an enjoyable and pleasant bond based on trust and mutual respect.

Reference

Carpenter, M., Bauer, T., & Erdogan, B. (2010). Management Principles, v. 1.1. https://2012books.lardbucket.org/books/management-principles-v1.1/index.html.

2MinutePsychology. (2013, September 16). The big five personality model [Video]. YouTube.

Waude, A. (2017, May 8). Five-Factor Model Of Personality. Retrieved April 19, 2020, from https://www.psychologistworld.com/personality/five-factor-model-big-five-personality#references

Iqbal, A., Aldaihani, A., Shah, A. (2019, October 12) International Journal of Innovative Technology and Exploring Engineering ISSN: 2278-3075, Volume-8 Issue-(IJITEE) Retrieved April 19, 2020, from https://www.ijitee.org/wp-content/uploads/papers/v8i12/J97550881019.pdf

Searching through all columns in datagridview

0
15 years
by in Visual Basic.Net

Assuming you are searching for the name John, the following procedure will search all existing columns regardless

Dim x As Integer = 0
 While x < DataGridView1.Rows.Count
 Dim y As Integer = 0
 While y < DataGridView1.Rows(x).Cells.Count
 Dim c As DataGridViewCell = DataGridView1.Rows(x).Cells(y)
 If Not c.Value Is DBNull.Value Or Nothing Then
 If CType(c.Value, String) = "John" Then
 MessageBox.Show("Found!")
 End If
 End If
 System.Math.Min(System.Threading.Interlocked.Increment(y), y - 1)
 End While
 System.Math.Min(System.Threading.Interlocked.Increment(x), x - 1)
 End While
 MessageBox.Show("Search complete!")
 End Sub

Filtering a datagridview

0
15 years
by in Visual Basic.Net

assuming you have a datagridview that has data in it.

you want to avoid recalling sql from the database & just want to filter the datagrid.

you can do the following, What you need (1 datagridview (data), 1 button (search), 1 textbox (string to search), 1 variable to precise the criteria your searching for)

Dim findcrit as string
Dim dt As DataTable = Ds_Pos.Employees
 Dim dv As New DataView(dt)
 
 Dim _RowFilter As String = ""
 Dim _FieldType = dt.Columns(findcrit).DataType.ToString
 
 Select Case _FieldType
 Case "System.Int32"
 _RowFilter = "convert(" & findcrit & ", 'System.String') like '" & Me.TextBox1.Text & "'"
 Case "System.Int64"
 _RowFilter = "convert(" & findcrit & ", 'System.String') like '" & Me.TextBox1.Text & "'"
 Case "System.Double"
 _RowFilter = "convert(" & findcrit & ", 'System.String') like '" & Me.TextBox1.Text & "'"
 Case "System.String"
 _RowFilter = findcrit & " like '" & TextBox1.Text & "*'"
 End Select
 dv.RowFilter = _RowFilter
 EmployeesDataGridView.DataSource = dv

The cases are to cast the type of variable from any type to string because you can only use the method on string data types.

the idea is to move the content to a data table then filter then return it back to the datatable.

using c# and vb in the same web project

0
15 years
by in Visual Basic.Net, Visual C#

Can you have both c# and visual basic in the same web site project?

Definitely! It simply wouldn’t make sense from a new project standpoint, code reviews, coding standards, continuity, project maintenance, etc.

however, people still want it.  to-date i never really tried (and that’s been my answer).  I was presented with a usable scenario of why you may need (not want, need) to do this, so I finally tried it.  the answer: yes…kinda…sometimes.

let’s assume we have a web site structure like this:

we have the App_Code folder and a .cs and a .vb file in the same projects (separated into sub-folders).  note that the project sees them as folders (yellow folder icon) in the special folder.  each class within there basically has a “hello world” function only, like this in the c# file:



public string SayHelloCS()
    {
      return "Hello from CS";
  }


and the visual basic file has a similar function emitting "Hello from VB."


now, if you run default.aspx in this structure, this is what you will see:


The files ‘/WebSite5/App_Code/VBCode/Class2.vb’ and ‘/WebSite5/App_Code/CSCode/Class1.cs’ use a different language, which is not allowed since they need to be compiled together.


interesting?  probably not, but it makes sense…so how do we overcome.  we use a configuration option called .  here’s what we need to add to our <compilation> node in our web.config:




<compilation debug="false">
          <codeSubDirectories>
            <add directoryName="VBCode"/>
            <add directoryName="CSCode"/>
          </codeSubDirectories>
       </compilation>


once we add those codeSubDirectory nodes, let’s “look” at what the project structure looks like now:


as you can see the code folders are now “special” in the eyes of visual studio.  now if we browse default.aspx we will see:


Hello world from CS. Hello world from VB



       


              

                           

       
    


    
  

  

  
                        
  
  


    


       
       
Custom error pages using .htaccess


              0
       
       


         
15 years


         


           
            by            

           in Php/Mysql         

       



       

         
We’ve all seen the dreaded Error 404 message – the result of broken  links and mistyped URLs. You’ve probably been on some websites where the  error pages are customised with their own logo and message, and I’m  sure you’ll agree that it looks far more professional than the standard  one.


In this article we’ll show you how to use Apache’s .htaccess  file to make your own customised error 404 pages.


Create a new text file on your computer, and call it “htaccess.txt”.  Enter the following lines:


<Files .htaccess>

order allow,deny

deny from all

</Files>




Now you need to create the 404 page. Make a new web page called  “error404.htm” and enter “This is my 404 page”. Enter it a few dozen  times, as Internet Explorer won’t display it unless the file is over 512  bytes.


Once it’s done, login to your webspace with your FTP client,  and create a new folder called “errordocs”. Upload the file  “error404.htm” to this directory. Upload “htaccess.txt” to the root of  your webspace and rename it to “.htaccess” — there’s no .txt at the end,  no name in front, just “.htaccess”. If the file seems to vanish don’t  worry, some FTP clients don’t display it — the file’s still there.




ErrorDocument 404 /errordocs/error404.htm


The first part stops people viewing your .htaccess file. The  second part tells Apache to redirect any 404 errors to the file  “error404.htm”.

       


       
    


    
  

  

  
                        
  
  


    


       
       
You do not have sufficient permissions to access this page” after WordPress upgrade


              1
       
       


         
15 years


         


           
            by            

           in Php/Mysql         

       



       

         
If you’ve done a wordpress upgrade which included either copying  another wp database or changing the current one’s table prefix (as well  as changing the $table_prefix PHP variable in your config file,) you  will most likely be met with this warning when you try to log in:


You do not have sufficient permissions to access this  page.


The reason for this is that everything in wordpress that accesses  info in the db does so from PHP using the $table_prefix variable, and  when you first installed your blog, a couple of options are set in the  database that include that value, which makes it not really so dynamic!  😉


After rooting through my db, I found 5 or 6 values that still had the  old table prefix in – mostly in the `usermeta` table, but also one in  the `options` table. To make sure I got them all, I ran these simple SQL  statements in phpMyAdmin to update all the values:


_usermeta table and _options table

       


              

                                

       
    


    
  

  

  
        
                

          

          
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