Search and Retrieve a Record from Access Database and VB.NET

Submitted by donbermoy on Sunday, May 25, 2014 - 19:33.

In this tutorial, i will teach you on how to create a program that can search and retrieve a record from an access database and vb.net. Now, let's start this tutorial! 1. Create an access file with the table, entities, and record below. Name your access database as sample.mdb (2003 format). access

2. Create a Windows Form Application for this tutorial by following the following steps in Microsoft Visual Studio: Go to File, click New Project, and choose Windows Application. 3. Next, add only one Button named btnFind and labeled it as "Find". This will search the inputted text in the searched textbox. Insert 4 textbox named txtSearch for the searching of student number, txtName for Student Name, txtCourse for Student course, and txtSection for student section. You must design your interface like this: design

4. Create a module in your project and named it, modConnection. Import Imports System.Data.OleDb library. This library package is for ms access database. In your module connection, initialize the following variables.

Module modConnection
 
    Public cn As New OleDb.OleDbConnection
    Public cm As New OleDb.OleDbCommand
    Public dr As OleDbDataReader

Now, create a method named connection to have the connection string. This will locate the sample.mdb access database that we have created earlier.

    Public Sub connection()
        cn = New OleDb.OleDbConnection
        With cn
  'Provider must be Microsoft.Jet.OLEDB.4.0, find the access file, and test the connection
            .ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Application.StartupPath & "\sample.mdb"
            .Open()
        End With
    End Sub

Full code of the modConnection module.

Imports System.Data.OleDb
Module modConnection
 
    Public cn As New OleDb.OleDbConnection
    Public cm As New OleDb.OleDbCommand
    Public dr As OleDbDataReader
 
    Public Sub connection()
        cn = New OleDb.OleDbConnection
        With cn
            .ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Application.StartupPath & "\sample.mdb"
            .Open()
        End With
    End Sub
End Module

5. Back to our form, put this code for the form_load. We will call the connetion() method that we have created in our module. Because we all know that module is access throughout the entire program.

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Call connection()
    End Sub

6. For the btnFind as the search button, put this code below. We will first create a try and catch method to have the exception handling. In the try method, we will create a Boolean variable named found for finding the student number. Here, we will use the OleDbCommand with the method of connection, CommandType.Text, and CommandText, with the OleDbDataReader to execute the CommandText.

        Dim found As Boolean
        Try
 
            cm = New OleDb.OleDbCommand
            With cm
                .Connection = cn
                .CommandType = CommandType.Text
                .CommandText = "SELECT * FROM tblStudent WHERE (Snum = '" & txtSearch.Text & "')"
                dr = .ExecuteReader
            End With

Next is to create a while statement for dr.Read to retrieve and display the data to the specified textbox, as well as making the Boolean variable found into True. Make cn.Close() in there and exit sub after finding the student number.

 While dr.Read()
 
                txtName.Text = dr("Sname").ToString
                txtCourse.Text = dr("Scourse").ToString
                txtSection.Text = dr("Ssection").ToString
                found = True
 
            End While
            cn.Close()
            Exit Sub

If the inputted student number is not in the database, put this code below.

  If found = False Then MsgBox("Student ID not found.", MsgBoxStyle.Critical)
            dr.Close()

Here is the full source code of our Form.

Public Class Form1
 
    Private Sub btnFind_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnFind.Click
        Dim found As Boolean
        Try
 
            cm = New OleDb.OleDbCommand
            With cm
                .Connection = cn
                .CommandType = CommandType.Text
                .CommandText = "SELECT * FROM tblStudent WHERE (Snum = '" & txtSearch.Text & "')"
                dr = .ExecuteReader
            End With
            While dr.Read()
 
                txtName.Text = dr("Sname").ToString
                txtCourse.Text = dr("Scourse").ToString
                txtSection.Text = dr("Ssection").ToString
                found = True
 
            End While
            cn.Close()
            Exit Sub
            If found = False Then MsgBox("Student ID not found.", MsgBoxStyle.Critical)
            dr.Close()
        Catch ex As Exception
 
        End Try
    End Sub
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Call connection()
    End Sub
End Class

After that, Press F5 to run the program. Output: output

Hope this helps! :) Best Regards,

Engr. Lyndon R. Bermoy
IT Instructor/System Developer/Android Developer
Mobile: 09079373999
Telephone: 826-9296
E-mail:[email protected]

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