Transaction in vb.net

This article shows how we can achieve successful transaction maintaining consistency of records in the database.
  • 8151
 

 Transaction:

 

Transaction is a process. A transaction can be a set of more then one process. If a transaction is a set of more then one process, then for successful completion of that transaction, it is necessary that all processes should be executed successfully in that transaction.

Let understand the transaction concept with this example.

Here in this example, I am using a set of two-process transaction. Here I am executing two commands simultaneously with transaction. With first command I am deleting a record from table and with second I am inserting a new record in the table.

 

Before executing the transaction, the record in the table is:

 Image1.jpg

Figure 1: Here in transaction I am deleting the record where location is England and also I am inserting a record in the table.

The code for this transaction is:

Imports System

Imports System.Collections.Generic

Imports System.ComponentModel

Imports System.Data

Imports System.Drawing

Imports System.Text

Imports System.Windows.Forms

Imports System.Data.SqlClient

 

Namespace TranSactionIn.NET

    Partial Public Class Form1

        Inherits Form

 

        Public Sub New()

            InitializeComponent()

        End Sub

        Private con As SqlConnection

        Private cmd1 As SqlCommand = New SqlCommand()

        Private cmd2 As SqlCommand = New SqlCommand()

        Private trm As SqlTransaction

 

        Private Sub Form1_Load(ByVal sender As ObjectByVal e As EventArgs)

 

            con = New SqlConnection("Data Source=(local);Initial Catalog=Employee; Uid=sa; pwd=")

            cmd1.CommandText = "delete from EmployeeRecord where Location='England'"

            cmd2.CommandText = "Insert into EmployeeRecord (DeptNo,Name,DepartName,Location) values ('901','Sahib','Manager','Africa')"

            cmd1.Connection = con

            cmd2.Connection = con

            con.Open()

            trm = con.BeginTransaction()

            cmd1.Transaction = trm

            cmd2.Transaction = trm

            cmd1.ExecuteNonQuery()

            cmd2.ExecuteNonQuery()

            trm.Commit()

        End Sub

    End Class

End Namespace


After running this code in table data we see that all records deleted where Location was England and a new record has been inserted in table. A very good example of transaction is banking money transaction.

Image2.jpg

Figure 2: After Transaction commit we can see the changed record.

NOTE: THIS ARTICLE IS CONVERTED FROM C# TO VB.NET USING A CONVERSION TOOL. ORIGINAL ARTICLE CAN BE FOUND ON DOTNETHEAVEN (https://dotnetheaven.com/).

Categories

More Articles

© 2020 DotNetHeaven. All rights reserved.