/// <summary>
 /// 初始化DesData的emp表
 /// </summary>
 private void InitEmpsFromDesData()
 {
     try
     {
         OleDbConnection con = empDao.Begin();
         empDao.DeleteAllEmpsDAO(con);
         empDao.Commit();
     }
     catch (Exception)
     {
         empDao.RollBack();
         throw;
     }
     finally
     {
         empDao.Close();
     }
 }