How to use Module and its uses in VB.Net with mySQL codes

How to use Module and its uses in VB.Net with mySQL codes

In this tutorial, you will learn how to use module and its uses in VB.Net with mySQL codes.

Take note, modules are not objects or building blocks like classes. Instead, they are like containers which can be useful in terms of locating your line of codes around the Solution Project easily.

To demonstrate the use of module, we will create a new project with the use of mySQL manipulation values. We will create an example of the following:

1. Connection Module – for easy call of mySQL connection string.
2. Add Module – for adding values in our database.
3. Update Module – for updating values in our database.
4. Delete Module – for deleting of values in our database.
5. Retrieve Module – for retrieving values from our database to datagridview.

Let’s start!

I made a sample database named module with test table. This is to achieve on how to use module and its uses in VB.Net with mySQL codes.

1. Create a module name connectionModule and insert this line of code:

[vbnet]

Imports MySql.Data.MySqlClient
Module connectionModule

Public conn As MySqlConnection
Public cmd As MySqlCommand
Public dr As MySqlDataAdapter
Public dt As DataTable
Public sql As String
Public result As Integer

Public Sub dbConnection()
Try
conn = New MySqlConnection
conn.ConnectionString = "server=localhost; userid=root; password=; database=module;"
Catch ex As MySqlException
MsgBox(ex.Message)
End Try
End Sub

End Module

[/vbnet]

2. Create a module named addModule and insert this line of code:

[vbnet]

Imports MySql.Data.MySqlClient
Module addModule

Public Sub addValue()
Try
dbConnection()
sql = "INSERT INTO test (`Username`,`Password`) VALUES (@Username, @Password);"
cmd = New MySqlCommand
With cmd
.Connection = conn
.CommandText = sql
.Parameters.Clear()
.Parameters.AddWithValue("@Username", Form1.TextBox1.Text)
.Parameters.AddWithValue("@Password", Form1.TextBox2.Text)
result = .ExecuteNonQuery()
End With
conn.Close()
Catch ex As MySqlException
MsgBox(ex.Message)
Finally
If result = 0 Then
MsgBox("Error in adding values!")
Else
MsgBox("Successfully added new values!")
End If
End Try
End Sub

End Module

[/vbnet]

3. Create a module named updateModule and insert this line of code:

[vbnet]

Imports MySql.Data.MySqlClient
Module updateModule

Public Sub updateValue()
Try
dbConnection()
sql = "UPDATE test SET Username = @Username, Password = @Password WHERE ID = @ID;"
cmd = New MySqlCommand
With cmd
.Connection = conn
.CommandText = sql
.Parameters.Clear()
.Parameters.AddWithValue("@Username", Form1.TextBox1.Text)
.Parameters.AddWithValue("@Password", Form1.TextBox2.Text)
.Parameters.AddWithValue("@ID", Form1.Label4.Text)
result = .ExecuteNonQuery()
End With
conn.Close()
Catch ex As MySqlException
MsgBox(ex.Message)
Finally
If result = 0 Then
MsgBox("Error in updating values!")
Else
MsgBox("Successfully updated selected values!")
End If
End Try
End Sub

End Module

[/vbnet]

4. Create a module named deleteModule and insert this line of code:

[vbnet]

Imports MySql.Data.MySqlClient
Module deleteModule

Public Sub deleteValue()
Try
dbConnection()
sql = "DELETE FROM test WHERE ID = @ID;"
cmd = New MySqlCommand
With cmd
.Connection = conn
.CommandText = sql
.Parameters.Clear()
.Parameters.AddWithValue("@ID", Form1.Label4.Text)
result = .ExecuteNonQuery()
End With
conn.Close()
Catch ex As MySqlException
MsgBox(ex.Message)
Finally
If result = 0 Then
MsgBox("Error in deleting values!")
Else
MsgBox("Successfully deleted selected values!")
End If
End Try
End Sub

End Module

[/vbnet]

4. Create a module named retrieveModule and insert this line of code:

[vbnet]

Public Sub retrieveValues()
Try
dbConnection()
sql = "SELECT * FROM test;"
cmd = New MySqlCommand(sql, conn)
dr = cmd.ExecuteReader
Form1.DataGridView1.Rows.Clear()
While dr.Read
Form1.DataGridView1.Rows.Add(dr(0), dr(1), dr(2))
End While
Catch ex As MySqlException
MsgBox(ex.Message)
Finally
conn.Close()
dr.Close()
End Try
End Sub

[/vbnet]

How to use module and its uses in VB.Net with mySQL codes.

After creating these modules, you can easily call them through their sub’s name.

Take note, you need to public your subs in order for the code to be useful anywhere in your project.

You are closing to achieve on how to use module and its uses in VB.Net with mySQL codes.

This will be the line of code inside our Form1 designer.

[vbnet]

Public Class Form1

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
retrieveValues()
End Sub

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
addValue()
retrieveValues()
End Sub

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
updateValue()
retrieveValues()
End Sub

Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
deleteValue()
retrieveValues()
End Sub
End Class

[/vbnet]

Success! You knew about on how to use module and its uses in VB.Net with mySQL codes.

RAR Extraction Password:

Password: luffypirates

For questions or any other concerns or thesis/capstone creation with documentation, you can contact me through the following:

E-Mail: [email protected]

Facebook: facebook.com/kirk.lavapiez

Contact No.: +639771069640

To download the sample project, click here.

Ian Hero L. Lavapiez

BSIT Graduate

System Analyst and Developer

Related topic(s) that you may like:

• Textbox Restriction using VB.Net
• Transferring Multiple Data from DataGridView to mySQL database

Technology stack and requirements

To run this VB.NET project, you need the following on your development machine:

• Visual Studio 2019 or later. The free Community Edition is enough for building, debugging, and running the project.
• .NET Framework 4.7.2 or higher. Most Windows 10 and 11 systems have it preinstalled through Windows Update.
• MySQL Server 8.0 or MSSQL Express 2019. Choose whichever your capstone panel prefers; both work with VB.NET data adapters.
• MySQL Connector/NET or SqlClient library. Add via NuGet Package Manager inside Visual Studio.
• Crystal Reports (optional). Required only if the project generates printable reports; install the runtime redistributable.

Installing the source code

The download link contains a ZIP archive with the full solution. Extract and set up in five steps:

1. Extract the archive to a folder outside Program Files (avoids permission issues).
2. Open the .sln file in Visual Studio. It loads the full solution with all forms and modules.
3. Restore NuGet packages. Right-click the solution then Restore NuGet Packages if prompted.
4. Import the database. Locate the .sql file in the archive and import via phpMyAdmin (MySQL) or SQL Server Management Studio.
5. Update the connection string in App.config or module code to match your local database name, user, and password.

How to use this project for your BSIT capstone

This VB.NET project maps cleanly to standard BSIT capstone documentation. Suggested chapter alignment:

• Chapter 1 (Introduction). Discuss the problem the system solves in real-world context. Cite Philippine business or academic use cases where a manual process could be replaced.
• Chapter 2 (Review of Related Literature). Compare this system’s features against 5-10 similar published projects. Cite journals like IJERT or IEEE Access for academic-standard sources.
• Chapter 3 (Methodology). Include Use Case Diagram, Data Flow Diagram, Entity Relationship Diagram, and Activity Diagram covering all major workflows in the system.
• Chapter 4 (Results and Discussion). Screenshot each module of the running system with a caption explaining what data it processes and which user role interacts with it.
• Chapter 5 (Conclusion and Recommendations). Identify features that could be added in a Version 2, such as web dashboard, mobile app, or REST API export.

Modules typical of How to use Module and its uses

• Master data. CRUD forms for the primary entities the system manages, with search and filter.
• Transaction processing. Data entry forms for the day-to-day operations the system automates.
• Reports. Formatted printable output summarizing activity per day, per user, or per category.
• User management. Login with role-based permissions (Admin, Encoder, Viewer).
• Backup and restore. Export database to a .sql or .bak file and restore when needed.

Common enhancements for capstone review

• Modernize the UI. Add Bunifu or Guna UI controls for a more polished, modern appearance.
• Add printable receipts. Integrate a printer preview form with page-setup options.
• Multi-user concurrency. Ensure the database handles simultaneous writes without lost-update errors.
• Web version. Rewrite the front-end in ASP.NET Core or React for a modern deployment path.