How to Rollback a sequence number

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public static void AddNew(string stu_name, string address, string Phone, datetime date)
        {
       String sql = "Select I_Student_ID.NEXTVAL from dual";
       Int newStudent_ID = 0;
  OracleDatabase db = (OracleDatabase)DatabaseFactory.CreateDatabase("PHTS");
    using (System.Data.Common.DbCommand cmd = db.GetSqlStringCommand(sql))
          {
            try
            {
                newStudent_ID = Convert.ToInt32(db.ExecuteScalar(cmd));
            }
            catch (Exception e)
            {
              cmd.Transation.Rollback();
             }
     
        OracleDatabase db = (OracleDatabase)DatabaseFactory.CreateDatabase("PHTS");
 
 using (System.Data.Common.DbCommand cmd = db.GetStoredProcCommand("AddNewStudent"))
            {
                db.AddInParameter(cmd, "I_Student_ID",DbType.Int32,newStudent_ID);
                db.AddInParameter(cmd, "I_STU_Name", DbType.String,stu_name);
                db.AddInParameter(cmd, "I_Address", DbType.String,address);
                db.AddInParameter(cmd, "I_Phone", DbType.String,Phone);
                db.AddInParameter(cmd, "I_Date", DbType.date,date);
 
               db.ExecuteNonQuery(cmd);
 
            }
 
        }
    }

I want to Rollback the sequence number for Student_Id if the transation has some problems. I am not sure how can I rollback the transation because the above code is not working, I can't rollback the .Nextval.

Thanks

Posted 4-Aug-11 3:40am

rbjanaki

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Herman<T>.Instance · Answer 1 · 2011-08-04T03:47:00

What I do:

C#

public static DataTable FillDataTable(String StoredProcedure, List<sqlparameter> sqlParameters, String ConnectionName)
        {
            DataTable tabel = new DataTable("GeneralTable");
            SqlTransaction transaction = null;
            using (SqlCommand cmd = BaseDatabaseData(StoredProcedure, sqlParameters, ConnectionName))
            {
                try
                {
                    using (transaction = cmd.Connection.BeginTransaction("SampleTransaction"))
                    {
                        cmd.Transaction = transaction;
                        SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                        adapter.Fill(tabel);
                        transaction.Commit();
                    }
                }
                catch (Exception ex)
                {
                    String Message = ex.Message;
                    transaction.Rollback();
                    throw new Exception(ex.Message, ex.InnerException);
                }
                finally
                {
                    if (cmd.Connection.State.Equals(ConnectionState.Open))
                    {
                        cmd.Connection.Close();
                        cmd.Connection.Dispose();
                    }
                }
            }
            return tabel;
        }
</sqlparameter>

I know I use the MSSql connection and not the Oracle one. I believe that setting up a transaction will work with the Oracle connection as with the mssql connection.
Method BaseDatabaseData returns me an open SqlConnection