Rolls back a database transaction from a pending state.
The following example creates a
PgSqlConnection and a
PgSqlTransaction. It also demonstrates how to use the
PgSqlConnection.BeginTransaction,
Commit, and
Rollback methods.
public void RunPgSqlTransaction(string myConnString)
{
PgSqlConnection pgConnection = new PgSqlConnection(myConnString);
pgConnection.Open();
PgSqlCommand pgCommand = new PgSqlCommand();
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()
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