Новые возможности Firebird 2.0. Примеры для ADO .Net (c#)

public void InsertReturning()
{
    // Описание: INSERT RETURNING - получение вставленных значений, подключение к Firebird 2.0 и выше
    OleDbConnection con = OpenFB2Connection();
    OleDbTransaction trans = con.BeginTransaction();

    //новая команда INSERT RETURNING 
    OleDbCommand cmd = new OleDbCommand(
    "insert into customer (cust_no, customer)     \n" +
    "values(GEN_ID(CUST_NO_GEN,1),:customer_name) \n" +
    "RETURNING cust_no",con,trans);

    cmd.Parameters.AddWithValue("customer_name", "New customer");
    //добавляем один выходной параметр
    cmd.Parameters.Add("customer_no", OleDbType.Integer)
 				.Direction =ParameterDirection.Output;

    Assert.AreEqual(1, cmd.ExecuteNonQuery());

    //удаляем запись, используя значение генератора, полученного 
    //через INSERT .. RETURNING
    OleDbCommand cmd_delete = new OleDbCommand(
    "delete from customer where cust_no=?", con, trans);

    cmd_delete.Parameters.AddWithValue("?",cmd.Parameters["customer_no"].Value);
    Assert.AreEqual(1, cmd_delete.ExecuteNonQuery());

    trans.Commit();
    con.Close();
}

public void RollbackRetainTest()
{
    // Описание: ROLLBACK RETAIN - получение вставленных значений, подключение к Firebird 2.0 и выше
    OleDbConnection con = OpenFB2Connection();
    OleDbTransaction trans = con.BeginTransaction();

    //insert new record 
    OleDbCommand cmd = new OleDbCommand(
    "insert into customer (cust_no, customer)    " +
    "values(GEN_ID(CUST_NO_GEN,1),'New customer')", con, trans);
    Assert.AreEqual(1, cmd.ExecuteNonQuery());

    //ROLLBACK RETAIN 
    new OleDbCommand("ROLLBACK RETAIN", con, trans).ExecuteNonQuery();

    // транзакция остается активной и мы можем выполнять команды снова
    cmd = new OleDbCommand(
        "select count(*) from customer", con, trans);

    Assert.IsTrue((int)cmd.ExecuteScalar() > 0 );

    trans.Commit();
    con.Close();
}

public void RowsKeywordTest()
{
      // Описание: ROWS - альтернатива FIRST/SKIP, доступно в Firebird 2.0 и выше
      OleDbConnection con = OpenFB2Connection();
      OleDbTransaction trans = con.BeginTransaction();

      //command will return 3 records
      OleDbCommand cmd = new OleDbCommand(
      "select * from customer rows 1 to 3", con, trans);

      short rec_count = 0;

      using (OleDbDataReader reader = cmd.ExecuteReader())
          while (reader.Read()) { rec_count++; }

      Assert.AreEqual(3, rec_count);

      trans.Commit();
      con.Close();
}

select * from
  (select EMP_NO, FIRST_NAME || ' ' || LAST_NAME from employee)
      as EMPLOYEE_DERIVED_TABLE (ID, FULL_NAME)