UniTransaction Class

In This Topic

Represents a SQL transaction to be made in the database.

Syntax

Visual Basic
C#

'Declaration
 
Public Class UniTransaction 
   Inherits Devart.Common.DbTransactionBase
   Implements System.Data.IDbTransaction, System.IDisposable

public class UniTransaction : Devart.Common.DbTransactionBase, System.Data.IDbTransaction, System.IDisposable

Remarks

The application creates a UniTransaction object by calling UniConnection.BeginTransaction on the UniConnection object. All subsequent operations associated with the transaction (for example, committing or aborting the transaction), are performed on the UniTransaction object.

The correlation between UniConnection and UniTransaction is always 1:1.

Example

The following example creates a UniConnection and a UniTransaction. It also demonstrates how to use the UniConnection.BeginTransaction, Commit, and Rollback methods.

csharp

public void RunUniTransaction(string myConnString)
{
  UniConnection myConnection = new UniConnection(myConnString);
  myConnection.Open();
  UniCommand myCommand = new UniCommand();
  UniTransaction myTrans;
  // Start a local transaction
  myTrans = myConnection.BeginTransaction(System.Data.IsolationLevel.ReadCommitted);
  // Assign transaction object for a pending local transaction
  myCommand.Transaction = myTrans;
  myCommand.Connection = myConnection;
  try
  {
    myCommand.CommandText = "INSERT INTO Test.Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')";
    myCommand.ExecuteNonQuery();
    myCommand.CommandText = "INSERT INTO Test.Dept(DeptNo, DName) Values(60, 'PRODUCTION')";
    myCommand.ExecuteNonQuery();
    myTrans.Commit();
    Console.WriteLine("Both records are written to database.");
  }
  catch(Exception e)
  {
    myTrans.Rollback();
    Console.WriteLine(e.ToString());
    Console.WriteLine("Neither record was written to database.");
  }
  finally
  {
    myConnection.Close();
  }
}

Visual Basic

Public Sub RunUniTransaction(ByVal myConnString As String)
  Dim myConnection As New UniConnection(myConnString)
  myConnection.Open()
  Dim myCommand As New UniCommand
  Dim myTrans As UniTransaction
  ' Start a local transaction
  myTrans = myConnection.BeginTransaction(System.Data.IsolationLevel.ReadCommitted)
  ' Assign transaction object for a pending local transaction
  myCommand.Transaction = myTrans
  myCommand.Connection = myConnection
  Try
    myCommand.CommandText = "INSERT INTO Test.Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')"
    myCommand.ExecuteNonQuery()
    myCommand.CommandText = "INSERT INTO Test.Dept(DeptNo, DName) Values(60, 'PRODUCTION')"
    myCommand.ExecuteNonQuery()
    myTrans.Commit()
    Console.WriteLine("Both records are written to database.")
  Catch e As Exception
    myTrans.Rollback()
    Console.WriteLine(e.ToString())
    Console.WriteLine("Neither record was written to database.")
  Finally
    myConnection.Close()
  End Try
End Sub

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.Data.Common.DbTransaction
         Devart.Common.DbTransactionBase
            Devart.Data.Universal.UniTransaction

Reference

UniTransaction Members
Devart.Data.Universal Namespace
UniDataReader Class
UniConnection Class

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