 Imports System.Data.OleDb

Public Class ClientDatabaseManager

    Dim connString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\ClientDB.accdb"
    Dim connection As New OleDbConnection(connString)

    ' Add New Client
    Public Sub AddClient(name As String, email As String, phone As String)
        Dim query As String = "INSERT INTO Clients (Name, Email, Phone) VALUES (@Name, @Email, @Phone)"
        Using cmd As New OleDbCommand(query, connection)
            cmd.Parameters.AddWithValue("@Name", name)
            cmd.Parameters.AddWithValue("@Email", email)
            cmd.Parameters.AddWithValue("@Phone", phone)
            connection.Open()
            cmd.ExecuteNonQuery()
            connection.Close()
        End Using
    End Sub

    ' Update Client
    Public Sub UpdateClient(id As Integer, name As String, email As String, phone As String)
        Dim query As String = "UPDATE Clients SET Name = @Name, Email = @Email, Phone = @Phone WHERE ID = @ID"
        Using cmd As New OleDbCommand(query, connection)
            cmd.Parameters.AddWithValue("@Name", name)
            cmd.Parameters.AddWithValue("@Email", email)
            cmd.Parameters.AddWithValue("@Phone", phone)
            cmd.Parameters.AddWithValue("@ID", id)
            connection.Open()
            cmd.ExecuteNonQuery()
            connection.Close()
        End Using
    End Sub

    ' Delete Client
    Public Sub DeleteClient(id As Integer)
        Dim query As String = "DELETE FROM Clients WHERE ID = @ID"
        Using cmd As New OleDbCommand(query, connection)
            cmd.Parameters.AddWithValue("@ID", id)
            connection.Open()
            cmd.ExecuteNonQuery()
            connection.Close()
        End Using
    End Sub

    ' Get All Clients
    Public Function GetAllClients() As DataTable
        Dim query As String = "SELECT * FROM Clients"
        Dim dataTable As New DataTable()
        Using adapter As New OleDbDataAdapter(query, connection)
            connection.Open()
            adapter.Fill(dataTable)
            connection.Close()
        End Using
        Return dataTable
    End Function

End Class

created 1 year ago by DATEK SOLUTIONS

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About VB.net

Visual Basic is a event driven programming language by Microsoft, first released in the year 1991.

Key Features

Beginner's friendly language.
Simple and object oriented programming language.
User friendly language and easy to develop GUI based applications.

Syntax help

Variables

Variable is a name given to the storage area in order to identify them in our programs.

Simple syntax of Variable declaration is as follows

Dim variableName [ As [ New ] dataType ] [ = initializer ]

Variable initialization

variableName = value

Conditional Statements

1. If

If condition-expression Then 
    'code
End If

2. If-else

If(conditional-expression)Then
   'code if the conditional-expression is true 
Else
  'code if the conditional-expression is false 
End If

3. If-else-if ladder

If(conditional-expression)Then
   'code if the above conditional-expression is true 
Else If(conditional-expression) Then
        'code if the above conditional-expression is true 
    Else
        'code if the above conditional-expression is false 
End If

4. Nested-If

If(conditional-expression)Then
   'code if the above conditional-expression is true
   If(conditional-expression)Then
         'code if the above conditional-expression is true 
   End If
End If

5. Select Case

Select [ Case ] expression
   [ Case expressionlist
      'code ]
   [ Case Else
      'code ]
End Select

Loops

1. For..Next

For counter [ As datatype ] = begin To end [ Step step ]
   'code
   [ Continue For ]
   'code
   [ Exit For ]
   'code
Next [ counter ]

2. For..Each

For Each element [ As datatype ] In group
   'code
   [ Continue For ]
   'code
   [ Exit For ]
   'code
Next [ element ]

3. While

While conditional-expression
   'Code 
   [ Continue While ]
   'Code
   [ Exit While ]
   'Code
End While

4. Do-while

Do { While | Until } conditional-expression
   'Code
   [ Continue Do ]
   'Code
   [ Exit Do ]
   'Code
Loop

Do
   'Code
   [ Continue Do ]
   'Code
   [ Exit Do ]
   'Code
Loop { While | Until } conditional-expression

Procedures

Procedure is a sub-routine which contains set of statements. Usually Procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Procedures are of two types.

1. Functions

Functions return a value when they are called.

[accessModifiers] Function functionName [(parameterList)] As returnType
   'code
End Function

2. Sub-Procedures

Sub-procedures are similar to functions but they don't return any value.

Sub ProcedureName (parameterList)
'Code
End Sub