BeginTransaction() Method
Begins a database transaction.
'Declaration
Public Overloads Shadows Function BeginTransaction() As PgSqlTransaction
Return Value
An object representing the new transaction.
The following example creates a
PgSqlConnection and a
PgSqlTransaction. It also demonstrates how to use the
BeginTransaction(),
Commit, and
Rollback methods.
public void RunPgSqlTransaction(string myConnString)
{
PgSqlConnection pgConnection = new PgSqlConnection(myConnString);
pgConnection.Open();
PgSqlCommand pgCommand = new PgSqlCommand();
pgCommand.Connection = pgConnection;
PgSqlTransaction myTrans;
// Start a local transaction
myTrans = pgConnection.BeginTransaction();
// Assign transaction object for a pending local transaction
pgCommand.Transaction = myTrans;
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();
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
{
pgConnection.Close();
}
}
Public Sub RunPgSqlTransaction(myConnString As String)
Dim pgConnection As New PgSqlConnection(myConnString)
pgConnection.Open()
Dim pgCommand As New PgSqlCommand()
pgCommand.Connection = pgConnection
Dim myTrans As PgSqlTransaction
' Start a local transaction
myTrans = pgConnection.BeginTransaction()
' Assign transaction object for a pending local transaction
pgCommand.Transaction = myTrans
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()
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
pgConnection.Close()
End Try
End Sub
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2