return "";

              System.Text.StringBuilder sb = new System.Text.StringBuilder();

              for(int i =0;i< this._Units.Count;i++)

              {

                   sb.Append(" " +this._Units[i] +" ("+ ((IExpression)_Expressions[i]).GetFilter(driver)+")");

              }

              return sb.ToString();

         }

         /// <summary>

         /// 获以内部表达式的参数值

         /// </summary>

         /// <param name="driver">数据设备提供者</param>

         /// <returns>System.Data.IDataParameter[]</returns>

         protected System.Data.IDataParameter[] GetSubParams(HFSoft.Data.IDriverType driver)

         {

              if(_Expressions.Count ==0)

                   return null;

              if(_Expressions.Count ==1)

              {

                   return ((IExpression)_Expressions[0]).GetDataParams(driver);

              }

              System.Collections.ArrayList lst = new System.Collections.ArrayList();

              foreach(IExpression exp in this._Expressions)

              {

                   System.Data.IDataParameter[] ps = exp.GetDataParams(driver);

                   if(ps !=null &&a

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