Rollback Method (PgSqlConnection)

In This Topic

Rolls back a transaction from a pending state.

Syntax

Visual Basic
C#

'Declaration
 
Public Sub Rollback()

public void Rollback()

Example

The following example demonstrates how to use Commit and Rollback methods.

csharp

public void RunPgSqlTransaction(string myConnString)
{
  PgSqlConnection pgConnection = new PgSqlConnection(myConnString);
  pgConnection.Open();

  PgSqlCommand pgCommand = new PgSqlCommand();
  pgConnection.BeginTransaction();
  try
  {
    pgCommand.CommandText = "INSERT INTO Test.Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')";
    pgCommand.ExecuteNonQuery();
    pgCommand.CommandText = "INSERT INTO Test.Dept(DeptNo, DName) Values(60, 'PRODUCTION')";
    pgCommand.ExecuteNonQuery();
    pgConnection.Commit();
    Console.WriteLine("Both records are written to database.");
  }
  catch(Exception e)
  {
    pgConnection.Rollback();
    Console.WriteLine(e.ToString());
    Console.WriteLine("Neither record was written to database.");
  }
  finally
  {
    pgConnection.Close();
  }
}

Visual Basic

Public Sub RunPgSqlTransaction(myConnString As String)
  Dim pgConnection As New PgSqlConnection(myConnString)
  pgConnection.Open()

  Dim pgCommand As New PgSqlCommand()
  pgConnection.BeginTransaction()
  Try
    pgCommand.CommandText = "INSERT INTO Test.Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')"
    pgCommand.ExecuteNonQuery()
    pgCommand.CommandText = "INSERT INTO Test.Dept(DeptNo, DName) Values(60, 'PRODUCTION')"
    pgCommand.ExecuteNonQuery()
    pgConnection.Commit()
    Console.WriteLine("Both records are written to database.")
  Catch e As Exception
    pgConnection.Rollback()
    Console.WriteLine(e.ToString())
    Console.WriteLine("Neither record was written to database.")
  Finally
    pgConnection.Close()
  End Try
End Sub

Reference

PgSqlConnection Class
PgSqlConnection Members
Commit Method
BeginTransaction Method

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