oracle批量导入数据

OracleDataAdapter da=new OracleDataAdapter();
                string sql_select = string.Format("select id,dt_date,dt_time,dt_hours from {0}", biao);
                string sql_insert = string.Format("insert into {0} (id,dt_date,dt_time,dt_hours) values(:id,:dt_date,:dt_time,:dt_hours)", biao);
                da.SelectCommand = new OracleCommand(sql_select, oraCon);
                da.InsertCommand = new OracleCommand(sql_insert, oraCon);
                da.InsertCommand.Parameters.Add(":id",OracleType.VarChar,32,"id");
                da.InsertCommand.Parameters.Add(":dt_date",OracleType.Number,8,"dt_date");
                da.InsertCommand.Parameters.Add(":dt_time",OracleType.Number,5,"dt_time");
                da.InsertCommand.Parameters.Add(":dt_hours",OracleType.Number,5,"dt_hours");
                da.InsertCommand.UpdatedRowSource = System.Data.UpdateRowSource.None;
                da.UpdateBatchSize=0;
                DataSet ds=new DataSet();
                da.Fill(ds);
                int dt_hours = -3;
                #region 
                for (int j = 0; j < 75/3;j++ )
                {
                    dt_hours = dt_hours + 3;
                    for (int i = 0; i < 25600; i++)
                    {
                        Guid guid = System.Guid.NewGuid();
                        Object[] row = { guid, sjint, 8, dt_hours };
                        ds.Tables[0].Rows.Add(row);
                        if (i % 400 == 0)
                        {
                            da.Update(ds.Tables[0]);
                            ds.AcceptChanges();
                            ds.Tables[0].Clear();
                        }
                    }
                    da.Update(ds.Tables[0]);
                    ds.AcceptChanges();
                    ds.Tables[0].Clear();
                    dt_hours = -3;
                }
                for (int j = 0; j < 75 / 3; j++)
                {
                    dt_hours = dt_hours + 3;
                    for (int i = 0; i < 25600; i++)
                    {
                        Guid guid = System.Guid.NewGuid();
                        Object[] row = { guid, sjint,20, dt_hours };
                        ds.Tables[0].Rows.Add(row);
                        if (i % 400 == 0)
                        {
                            da.Update(ds.Tables[0]);
                            ds.AcceptChanges();
                            ds.Tables[0].Clear();
                        }
                    }
                    da.Update(ds.Tables[0]);
                    ds.AcceptChanges();
                    ds.Tables[0].Clear();
                    dt_hours = -3;
                }
                #endregion 
                da.Dispose();
                ds.Dispose();
                oraCon.Close();
                this.button2.Enabled = true;